INSTRUCTION MANUAL

Type 1840-A

Output Power Meter

G

GENERAL RADIO

WØCCW

WARRANTY

We warrant that this product is free from defects in material and workmanship

and, properly used, will perform in full accordance with applicable specifications.

If, within a period of ten years after original shipment, it is found, after examina­

tion by us or our authorized representative, not to meet th is standard, it will be re­paired or, at our option, replaced as follows:

• No charge for parts, labor or transportation during the first three months after original shipment;

• No charge for parts or labor during the fourth through the twelfth month after original shipment for a product returned to a GR service facility;

• No charge for parts during the second year after original shipment tor a product returned to a G R service facility;

• During the third through the tenth year after original shipment, and as long thereafter as parts are available, we will maintain our repair capability and it will

be available at our then prevailing schedule of charges for a product returned to a

GR service facility

This warranty shall not apply to any product or part thereof which has been subject to accident, negligence, alteration, abuse or misuse; nor to any parts or components that have given normal service. This warranty is expressly in lieu of

and excludes all other warranties expressed or implied, including the warranties

of merchantability and fitness for a particular purpose, and all other obligations or liabilities on our part, including liability tor consequential damages resulting from product failure or other causes. No person, firm or corporation is authorized to assume for us any other liability in connection with the sale of· any product.

©GENERAL RADIO COMPANY 1972 Concord, Massachusetts, U.S.A. 01742

Form 1840-01 OO-G

November, 1972

102642

Figure 1. Panel view of the Type 1840.A Output Power Meter.

SPECI FICATIONS

RANGES Power: 0.1 mW to 20 W, 40 Hz to 20 kHz. Below 40 Hz, max rating is reduced by up to 50°/0 (at 25 Hz), depending on imped­ance selected. Auxiliary dB scale reads from -15 (0 +43 dB re 1 mW. Impedance: 0.6 0 to 32 kO in two ranges; yielding 48 individual impedances spaced approximately ij2 apart.

ACCURACY Power: At 1 kHz, ±0.3 dB;

50 Hz to 6 kHz, ±0.5 dB; 30 Hz to 10 kHz, ±1 dB; at 20 Hz, -1.5 dB max, -1 dB avg; at 20 kHz, -5 dB max, ±1.5 dB avg.

Impedance: At 1 kHZ, ±6°,lo max, -0.5°,10 avg; 70 Hz to 2.5 kHz, ±7% above 10 kQ; 70 Hz to 5 kHz, ±7% below 10 kQ; at 20 Hz, -15°/0 max, -8°1o avg; at 20 kHz, ±500/0 max, ±12°/0 avg.

Waveform Error: Meter will indicate true rms with as much as 20% second and third harmonics present in the input signal.

GENERAL Mounting: Convertible-Bench Cabinet. Adaptors for rack mounting available.

Dimensions (width x height x depth): 12 x 4 x 8 in. (305 x 105 x 205 mm). Rack-adaptor panel height, 31/2 in.

Weight: Net, 1()3/4 Ib (4.9 kg); shipping, 17 Ib (8 kg).

Catalog DescriptionNumber

1840-9701 1840-A 0 utput Power Meter

CAUTION

Do not overload by more than 30 dB short-term (40 W

max) to avoid permanent damage.

1.1 PURPOSE

T~-.2 ~.:~-- ~

passive :-.c~"

ternal l~-;=-~:"_" __

and other :.: _~'_=~

cated dire:- _ . _ setting tr.2 ~ ": __ ­

1.2 DESCRIPTIO",

The ~'-:"

tap tran sio:- --:- ~:- ­logarithmi-: ':"._' Successi\'c :--2;-:­pernlitting d : _ ~:: _~ ~

load incorp,~,:·-.: -~ ~ :.. 1 power) st2;' s. (meter plu S 1"2:-: :',::.-­

ferred to 1 c..... iL.:·.· ~--.

resistance re::-:._''-~:'' _­BECAUSE THE ~-:-?~ _.~,

MUST BE EXERCI~~=

SISTORS, TH.-\ T :.:= ~ - - ~ = CURRE:L\T AT L C-.\ ~? ~ _.'. ~

quenc y Ii111 ita t L=:' =-.::: :' ~- - :: The curves \\-er2 :'2~~='--' _--. _ duce approxin1dte ::- -=- ~.-:. _­

Figure 3 ::-~ -.. :::

Output Po\ver ).lete:::-. The con\-erti~::-_'2

with adjustable fr,~·~ - ~~:: - ­lock the feet in tr_~ -: _~_- ~ - _­Further rotati o=-:. :. 2 _2.:. - -= ­

posi tiono

~

~

~I ~tput Power Meter.

: NS

_ =~:ON 40 Hz, max :~:~-::'rig nr'l imped­

.. :- -:5 cO +43 dB

• ~ : .. 5 48 individual

!. ~

:: «.:-. e_

~ f ~

-"-; ... - .. as much as - ---? -~ut signal.

:.:-: ~:. ra:k mounting

~ x : - 3J5 x 105 x

: .~

~4-

40W

INTRODUCTION

SECT!()N 1 INTRODUCTION

1. 1 PURPOSE.

The Type 1840- A Output Power Meter (Figure 1) is an adjustable, passive network for the determination of the power output and of the in­ternal impedance of audio-frequency generators, amplifiers, transducers, and other sources of audio-frequency power. The power output is indi­cated directly, and the internal impedance is indicated by the impedance setting that yields maximum power output.

1.2 DESCRIPTION.

The Type 1840-A comprises an essentially constant load and a multi­tap transformer that transforms the load to 48 discrete impedance values, logarithmically distributed over the range from 0.6 ohm to 32 kilohms. Successive steps vary approximately as the sixth root of four (=1.26 to 1), permitting a close approximation to any value within the range. The fixed load incorporates a "T" -network attenuator, calibrated in 10-decibel (10 to 1 power) steps. It is terminated in a quasi root - mean - square detector (meter plus rectifiers) calibrated in both watts and decibels, the latter re­ferred to 1 milliwatt. Compensating resistors are employed to adjust for resistance removed as the secondary of the transformer is tapped down. BECAUSE THE TYPE 1840-A INCORPORATES A TRANSFORMER, CARE MUST BE EXERCISED WHEN TESTING DEVICES, PARTICULARLY TRAN­SISTORS, THAT MIGHT BE DAMAGED BY EXCESSIVE MAGNETIZING CURRENT AT LOW FREQUENCIES. Figure 2 indicates the power-vs-fre­quency limitations for the various settings, imposed by this consideration" The curves were determined by the primary volts per turn required to pro­duce approximate saturation of the transformer core.

Figure 3 shows a simplified schematic diagram of the Type 1840- A Output Power Meter.

The convertible bench cabinet that houses the Type 1840-A is equipped with adjustable front feet to tilt the unit for easier reading of the meter. To lock the feet in the fully extended position, rotate them until a click is heard. Further rotation releases the locks for return of the feet to the retracted positiono

C

~_TY_P_E_18_40_._A_O_U_T_P_U_T_P_O_W_E_R_M_E_T_E_R

CUR

A

B

D

E

F

20

VE ,, ---+' /

---' J

------l1lI ,

~

~-V---­ ~~'"

J If

/

~

./

~

/

~

~

-'"

J If'

~

~

/

/

~

~

V

~

./

,

~

~

/

~

~

~ ./

/

l"

/

, '" ,

~ ~

CYCLES PER SECOND

_

20

15 Pigure 2. Power limitations liS frequency and impedance setting (see Table 1).

5

o 25 30 35 40

Figure 2 I A Curves

n {~10 40

{ 0.. 15 0.6Kn 2.5

10

TABLE 1 IMPEDANCE SETTING

B C I D

-+= E F

Direct Current For 0.5 DB Error

0.8 3.12

12.5 50

0.2 0.8 3.12

12.5

1 I 1.25 4 5

16 20 64 80

0.. 25 0.312 1 1.25 4 5

16 20

1.6 6.4

25 100

0.4 1.6 6.4

25

2 8

32 128

0.5 2 8

32

2 amp 1 amp 0,,5 amp

250 rna

125 rna 63 rna 32 rna 16 rna

1.3 CONTROLS AND CONNECTORS.

The following table lists the controls and connectors on the panel of the Type 1840-A Output Power Meter:

(C ontinued)

l\one

Ii, :, ~

0' :' ~

~ c-+-·.· ..~

~ B£:"-';

JIOO ~-.,~~ ~ @---~ g ~-"!~:;

,-,----9..J ~ .:= .;: • ~ ~:'2~'~~

~ ~ ::: - ~ viOl '-' =.....-- .. .1..--4

@-­ ~ f_".r::

ii~ ~3; _- :

i:~~::;-' I.~

"~,---

NAME TYPE FUNCTION

LOAD

FULL­SCALE POWER and ADD DB

2 -position (n-Kn) switch and 24-position rotary switch"

5-position rotary switch.

These two switches select the load. When the n-Kn switch is in the n posi tiOl1, any value between 0.6 and 128 ohms can be selected on the inner (white) scale of the rotary switch. When the n-Kn switch is in the Kn position, any value between 0.15 and 32 kilohms can be selected on the outer (r!=d) scale of the rotary switch.

This switch selects the power and decibel levels. The lower figures (white) give the full-scale power reading of the meter. The upper figures (red) indicate the dec­ibels that must be added algebraically to the meter reading.

NOTE SIO:J

POSIT/ONS 1-4 AND 23824 == • POSIT/ONS 5-10 POSIT/ONS 1-16 POSIT/ONS 17-22 SECONDARY IN POSITION I ,t!-lE

89 OHMS

SECONDARY IN POSITION 2 ,Ai!-lE'·

SECONDARY IN POSITION 3 ... ,...,E'. ". .:. ­

SECONDARY IN POSITION 4 ";';"£'. SECONDARY IN POSIT/ON 5 /lrhE'. ,_ SECONDARY IN POSITION 6 I1I"",E'.

2

CR300

R3DI

RlCOs

~\r--eRIO/

_ ficOO«

~ R2IAf.

: ~:. Tf:2 POU'f'r limitations

~ 'TE'quency and impedance - .. ::~:~ (see Table 1).

Direct Current= For 0.5 DB Error

2 amp 1 amp Og5 amp

250 rna

~1. :s 125 rna 63 rna 32 rna 16 rna

~ _=-.=-.2ctors on the panel of

____ - ..-,-= ~=iad. When the n-Kn -. ::"=-_-.- ',-alue between 0.6 and

=- -:-.2 l:-.ner (white) scale of :: - . -::- .--: -K ~ S\\'itch is in the Kn

'-:.. ::::- . ~ ~ 2::1d 32 kilohms can be ;::: -=-_>2 Jf the rotary switch.

-=:~. 2=-.0 decibel levels. The - -:: :=- _ ~~ - 52ale power reading "_;_=-'2~ \:"ed) indicate the dec­

.;. _:-"2'.==-"2ically to the m8ter

(Continued)

INTRODUCTION

NAME TYPE FUNCTION

None Jack -top binding posts (three).

rrhe unknown is connected at the high (left) and low binding posts. The ca se binding post (metal top) can be connected to the low post by means of the captive strap; it can be left floating, or it can be independently grounded, as desired. For best accuracy at high fre­quencies' disconnect the grounding strap from the low inpu t terminal.

n Figure 3. Elementary schematic diagram

of the Type 1840.A Output Power Meter.

r------­5/00 R3/4 =$­9~P 90411

I·" .. .,. 90!JH REfit~R8/6

~ ~ l

R8/2 ~? ~

R813-s:

~.;H 1+ C300

f C30I..:'8/4"5- 'l'V'l'...... .14p.....:; R311~ R317 Ti .1i815f ~

:; +

PIR R3'0 h _ R3C8"5 R309

~ R306~

P305~~ ~

NOTE SIOO

POSITIONS 1-4 AND 23 a 24 8 PRI WINDINGS IN PARAL LEL POSITIONS 5-10 2 PRI WINDINGS IN SERIES 4 IN PARALLEL POSITIONS 1-16 4 PRI WINDINGS IN SERIES 2 IN PARALLEL POSITIONS 17-22 8PRI WINDINGS IN SERIES NOMINAL PRIMARY RESISTANCE 303 OHMS SECONDARY IN POSITION I WHEN SIOO IS IN POSITIONS 23-5-//-17 NOMINAL SECONDARY RESISTANCE

89 OHMS

SECONDARY IN POSITION 2 WHEN SIOO IS IN POSITIONS 24-6-12-18 SECONDARY IN POSITION 3 WHEN SIOO IS IN POSITIONS 1-7-13-19 SECONDARY IN POSIT/ON 4 WHEN SIOO IS IN POSITIONS 2-8-14-20 SECONDARY IN POSITION 5 WHEN SIOO IS IN POSITIONS 3 -9-15 -21 SECONDARY IN POSITION 6 WHEN SIOO IS IN POSITIONS 4-10-16-22

3

~ TYPE 1840-A 0 UT PUT POW E R MET E R ~

2.4 ACCURACY OF MEASURE ...·E~-S

2.4.1 METER INDIC_~TIC~ ..:.. == reading is less than O. 5 ~ ::::-.;..-::" at 20 and 20,000 cps if r:-.e -: ='",:::­

2.4.2 ACCURACY OF L\~?~=.:.~~

within ±(5% + 0.02 ohm) :::::-:- - ~Section 2 watts and from 250 cps :: ~.: .<.:. mum error is not more t~.::-- ~"': ~OPERATING PROCEDURE 2.4.3 WAVEFORM ACCl-?_:'.:·:· reasonable freedom fro:7: 2:::: = =­mally encountered wavefc::::-:-. ~ ­

2.4.4 REACTANCE ACCl?.':'.-:": terminated by the Type 1S.;: - .:..

2.1 DETERMINATION OF UNKNOWN IMPEDANCE. ance present in most audic ':2-.-:':'

To find the value of an unknown source impedance, set the LOAD racy. switches to their highest readings and reduce these readings, step-by-step, 2.4.5 DIRECT-CURRE~l -~.=='. until the maximum power reading of the meter is obtained. The source im­ current that can traverse t:-.2 -=--.-;pedance is the value indicated by the LOAD switches that gives this maxi­ out exceeding a maximuIT. 2:::: = =­mum meter reading. ALWAYS START WITH THE FULL SCALE POWER SWITCH SET TO 20 WATTS, to avoid damage to the meter.

2.2 HIGHER.POWER SOURCES.

To use the Type 1840-A with sources of higher power (up to 200 watts), a uTt -network attenuator (Figure 4) should be used. To find the proper im­pedance (Z), operate the source below 20 wattsQ The resistance can then be calculated and the proper values can be inserted in the circuit.

Connect the "T' attenuator (Figure 4) between the source and the Type 1840-A. The attenuator adds 10 db to the meter-switch indication, and the meter now reads 200 watts full-scale.

ttl 0.5195 Z 0.5195 Z

104 WATT 10.4 WATT } .1 0.7027 Z 66 WATT ~046~:E Figure 4. "T".Network attenuator.~gJ:~~- {

SET TO ZZ OHMS .>-----........-------(":

2.3 INSERTION LOSSES.

The insertion loss of an audio device can be determined from the out­put of a system before and after the insertion of the device in question. The difference between the two maximized decibel readings is the insertion loss in decibels.

Similarly, the insertion loss of a transformer can be measured. Note the decibel readings before and after insertion of the transformer into the circuit. The difference between these two readings is the insertion loss.

4

E~ OPERATING PROCEDURE

)CEDURE

--::-= ~::1pedance, set the LOAD >2 :'-.cse readings, step-by-step, ::-~ _~ ,~jtained. The source im­~ ..::: ::hes that gives this maxi­

=-~ -=-~E FULL SCALE POWER '-= ~: :~le meter.

: -.~;.-.=r po\ver (up to 200 watts), :~ _~-=:.. To find the proper im­,~5. ~--:e resistance can then be :-;;;:. :::- the circuit. ~c:-.·"-=2:-_ :he source and the Type :-_ -=~-= ~ - S"xitch indication, and the

- T". \ e tu ark attenuator.

:.:..~ ~ -= :'e:ermined from the out­- =: ~_-.e :'e\ice in question. The

-=_ -:-:::=.:":':-.g5 is the insertion loss

~ == :-~. -= ~ '::2:-: je measured. Note ~ = ~ _: ::-.e transformer into the

-: -=.:..:': ~_; ~ : ~ the insertion los s.

2.4 ACCURACY OF MEASUREMENTS.

J 2.4.1 METER INDICATION ACCURACY. The error in the full-scale power reading is less than 0.5 db between 50 and 6,000 cps. It is less than 1.5 db

-) at 20 and 20,000 cps if the Dower limitations of Figure 2 are observed.

2.4.2 ACCURACY OF llviPEDANCE INDICATION. The impedance error is within ±(5% + 0.02 ohm) from 20 cps to 2 kc at power levels above 2 milli­watts and from 250 cps to 1.5 kc on the 2-milliwatt scale. At 20 kc, maxi­mum error is not more than £0% if the limitations of Figure 2 are observed.

204.3 WAVEFORM ACCURACY. The quasi -rms meter circuit assures reasonable freedom from error introduced by the harmonic content of nor­mally encountered waveforms (20% second and third harmonics).

2.4.4 REACTANCE ACCURACY. Highly reactive sources are improperly terminated by the Type 1840-A and yield erroneous readings. The react­ance present in most audio devices will have a negligible effect on the accu­racy.

2.4.. 5 DIRECT-CURRENT ACCURACY. Table 1 gives the values of direct current that can traverse the Type 1840-A for each impedance setting, with­out exceeding a maximum error of 0.5 db.

l' .J

5

~ TYPE 1840-A OUTPUT POWER METER

PARTS LIST EXPLANATION OF CONTACT NUMBERING ON ROTARY SWITCHES

Rotary switch sections are shown as viewed from the panel end of the shaft. -The first digit of the contact number refers to the section" The section nearest the panel is 1, the next section back is 2, etc. 'The next two digits refer to the con­tact. Contact 01 is the first position clockwise from a strut screw (u~ually the scre\v above the locating key), and the other contacts are numbered sequentially (02, 03, 04, etc.), proceeding clockwise around the section. A suffix F or R indicates that the contact is on the front or rear of the section, respectively.

ELECTRICAL PARTS LIST

Fed Ref Des Description G R Part No. Mfg Code Mfg Part No. Fed Stock No.

RESISTORS

R1ULJ L.21 k Q ±1f Il) W Part of RI0l 1.87 kQ ±1'! 7 W 1840 -0410 24655 1840 -0410 5905 -933 -6806 R200 1.54 kQ ± 1') 2 W Part of R201 1.21 kQ ±1; I \,y 1840 -0420 24655 1840 -0420 5905 -933 -6807 R300 POL, \Vire -wound 10 kS1 ±10[/ 6050-1800 126Q7 43 WK, 10 kQ ± LUI! 5905 ­ 794 -3 858 R301 Film, 2.61 kQ "1:1'7 1/4 W 6350-L261 75042 CEB, 2.61 kQ ::tIC? 5905 -583 -6885 R302 FilI11, 1.54 kQ .:t1 1r 1/4 W 6350 - L154 75042 CEB, 1.54 kQ ±1 c,~

R303 FilI11 , 1.1 kQ ±1',! 1/4 W 6350-1110 75042 CEB, 1.1 kQ :::1 1 ;;' 5905 -681 -3222

R304 Con1position, 6.8 kQ ±5)? 1/2 \V 6100 -2685 01121 RC20GF682J 5905 -279 -3503 R305 rilm, 1.54 kQ ± 1/4 W 6350-1154 75042 CEB, 1.54 kQ ± 1ex R306 Film, 1.21 kQ ± 1/4 W 6,')50 -1121 75042 CEB, 1.21 kQ ±1S! 5905-577-7504 R307 Film, 1.07 kQ 1/4 W 6350 -1187 75042 CEB, 1.87 kQ ±19{ R308 Filn1, 1.54 kQ.:t 1/4 \V 6350-1154 75042 CEB, 1.54 kQ ± It{' R309 Film, 1.87 kQ 1/4 W 6,15()-1187 75042 CEB, 1.87 kQ "tIll' R310 Film, 1.21 kQ ±1 1/4 W 6350-1121 75042 CEB, 1.21 kQ 5905-577-7504 R:3 11 F ih11, L. 54 k~? 1/4 \V b350-1154 75042 CEB, 1.54 kQ R312 Film, 1.87 kQ ±l l ;? 1 W 6550-1187 75042 ['viE F, 1.87 kQ ±1 5905 -577 -6439 R314 Composition* R811 Composition, 3:1 Q ±5';T( 1/2 \V 6100 -0335 01121 RC20G F330J 5905-192-4490 R812 Composition, 22 n ±5l;~­ 1/2 W 61UO -()2 25 01121 RC20GF220J 5905-279-3519 R813 C0I11position, 51 rz ±5'~ 1/2 \V b 100 -05 L5 01121 RC20GF510J 5905 -279 -351 7 R814 C0I11position,33 Q ::t5 'Ji 1/2 \V 6 LOO -0:135 01121 RC20GF330J 5905 -192 -4490 R8I5 Composition, 130 kQ ±5'? 1/2 \V 6100-41.')5 01121 RC20G F 134J 5905 -249 -9468 R816 Composition, 47 kQ ±5~ 1 W 6110-3475 01121 RC32GF473J 5905 -299 -201.') R817 Composition, ,')3 [2 :!:5\{ 1/2 W 6100 -0335 0112] RC20GF330J 5905-192-4490 R818 Composition, 56 [2 "t5'f: 1/2 \V 6100 -0565 01121 RC20GF560J 5905 -279 -1897 R819 Composition, 75 ~2 ±5\{ 1/2 \"'1 6 LOO -0755 01121 RC20GF750J 5905 -279 -1 758 R820 Composition, 91 Q !:5~ 1/2 \V 6100 -0915 01121 RC20GF910J 5905 -279 -3 516 R821 Composition, IOU Q ±5'!Z, 1/2 \V 6100-1105 01121 RC20GFI0IJ 5905 -190 -8889

OTHER

C300 Capacitor, Elec 10 ~f 50 dcWY 4450 -3100 56289 D33610 5910 -723 -2517 C301 Capacitor, Flec 10 ~f 50 dcwv 4450 -3100 56289 D33610 5910 -723 -2517 CR300 Diode, Type IN34AS 6082 -1003 93332 IN34A (S) 5961-170-4430 NOTES

CR301 Diode, Type 1N34AS 6082 -1003 93332 1N34A (5) 5961-170 -4430 RESISTORS 1/4 WATT UIyLESS :- ....E-= .. ;-:

J100 Binding Post 4060-0400 4060 -0400 5940 -951-9300 RESISTANCE IN OHMS ..,,', _~: _~ : --:.-,; ... -:

JI01 Binding Post 4060-0410 24655 4060-0410 K =1000 OHMS J,j: l,i~ ~:­ '.t

JI02 Binding Post 4060-1800 24655 4060 -1800 CAPA CITANCE VA LUES :Y.E ..; '._­ :.~':

M100 Meter, 50 l-1a 1500 Q 5730-1280 40931 5 ~a, 1500 Q LESS THAN ONE IN !II/~P:Ft.;;':':5 _' _~-­

S100 Switch, Rotarv Wafer 7890 -2440 24655 7890 -2440 5930 -933 -6779 OTHERWISE SPECIFIED

S200 Switch, Rotary \Vafer 7890 -2420 24655 7890 -2420 5930 -933 -6778 ~ C::CREWDRIVER COtv ~;:;:_

S300 Switch, Rotary \Vafer 7890 -2430 24655 7890 -2430 5930 -933 -6777 TI00 Transformer' 0365-4001 24655 0365-4001 6120 -933 -6601

*Value determined by GR Laboratory

6

fi305 /,54K

IOJF

8)(

R309 /.87K

*R314

R/OI /87K,7W

GY

Re

vr

PB.'J 16K

,,'2W

R81E B.PI<'

IJ.JJ!:--~ R8/5 13CK !./2;V

WH-Ij~

YE 'TJ4B)

YE

GN

GY

r ~ WH-GY ~

III I

OR

IT

BL

,,·H-BK

wH·OR-IJK

WH-YE

~ cf;'b ,. o \ I 1 Q

~~'--';~~~y",..,l."" o .>, y'''' Irr .... 1~4F

~ /I~F

rb ~ I "0

\. JJI ,..,l.l' ... ", 0 $20, '---1

>J ..... ,,~

y''' 1'""1-\ ''\ ­o JI I \.0

~\~/,)

1\

~

WH-DL wH-8L-8K

716R ~-::;.<",-':i" b~~~,·'~ ,,", I ill OR R8/8

~o 56

VT 2~ FII //2w

ri!L...-....... 5100 R8t:)B02FII ;>b

1:11 ,,2W

WH-GIV I P8PI

5100 100

~ 1/2W

SIOO BO.JFR ~

R8':'O 9/

//2W

R8/i' 5100 J'1.

516R ~"---/_'..y 'V',,~,....~ 1. W"",U-"JK 'II I I I I 81!2~R //2W

DR

316R

TES

~ESISTORS 1/4 WATT UNLESS OTHERWISE SPECIFIED

'[SISTANCE IN OHMS UNLESS OTHERWISE SPECIFIED K =1000 OHMS M:r I MEGOHM

'/l/'Ac/rANCt VAL ues ONE AND OVER IN PICOFARADS, t '; .... TlIAN ONE. IN MICROFARADS, UNLESS

'1111 HW/'·I SI'1 ('If 111 1

.{ /,'t Ii-'/'I.'/II h' ('(INfh','!

CR (TAli)

I I

O.{ql \ \oJ I05FWH-5K I

WH-YE-BK 11,1'

~:I ~~;I

2 2.5 3.-12---LOAD~ 1.6 8 ADD DB

1.25 6.4 10 12.5 ..

I 5 16 5 .n\Kn I::> ~!) 3::>

20 o~ 4U0.8 3.12 25 6 .4

32 8 LEGEND FOR S200o 62.!~

20~ ~2mWO~7 / ~IO 1 f, ~o

2W {'OrnW('OL)rr,W " 17 ")

1"-' ',4 f III I <;,AI f POWf R,,'I: 1 nl) II. ((I)),I/{),

R8/6 47K IW

SIOO 810FR

f 1

t ATe •

AT ':300Ie C .10/ IJpFTRJOI. f-r3J.l IOpF AT +A

;. 1.54K:( /./K @ c'W' • ~WH'OR ,

T 5 1'1.- • WH-vr ./-\6J-­

r7-;~()A A r ---'I;\A- M/OO

/OK,I/22 R3J4 W ('I-T."l'\)

r:ft.J }/

":"1 1111" •• I.'" "'" AT,II,',' ,11,'1 il(,INOI,'I, y

II 1 ".'i ;-'

I

FEDERAL MANUFACTURERS CODE

From Federal Supply Code for MonufacturerJ Cotol09in9 Handbooks H4-1 - :. .... (Hame to Code) and H4-2 (Code to Hame) as supplemented through Juno, 1967.

Code

00192 00194 00656 01009 01121 01295 02114

02606 02660 02768

03508

03636 03888 03911 04009

04713

05170

05624 05820 07127

07261 07263

07387 07595

07828 07829 07910 07983 07999

08730 09213 09408 09823 09922 112.36 115Y9 12498

12672

12697 12954 13327 14433 14655 14674 14936 15238

15605 16037 1"644 19701 21335 24-141:> 24454 24455 241155 268011 2t>520 28959 3(J874

32001 35929

37942

5/68

Manufacturers Nome and Address

Jones Mfg. Co., Chicago, IllinOlS Walsco Electrolllcs Corp., Los Angeles, Calif. Aerovox Corp., New Bedford, Mass. Alden Products Co., Brockton, Mass. Allen-Bradley, Co., Milwaukee, Wise. Texas Instruments, Inc., Dallas, Texas Ferroxcube Corp. of America,

SaugertIes, N. Y. 12477 Fenwal Lab. Inc., Morton Grove, 111. Amphenol Electronics Corp .. Broadview. Ill. Fastex Division of Ill. Tool Works,

Des PlaInes, Ill. 60016 G. E. Semiconductor Products Dept.,

Syracuse, N, Y. 13201 Grayburne, Yonkers, N. Y. 10701 Pvrofilm Resistor Co., Cedar Knolls, N. ]. Clairex Corp., New York, N. Y. 10001 Arrow, Hart and Hegeman Electric Co.,

Hartford, Conn. 06106 Motorola Semi-Conduct Product,

Phoenix, Ariz. 85008 Engmeered Electronics Co., Inc.,

Santa Ana, Calif. 92702 Barber-Colman Co., Rockford, Ill. 61101 Wakelield Eng., InC., Wakefield, Mass. 01880 Eagle Signal Div. 01 E. W. Bliss Co.,

Baraboo, WISC. Avnet Corp., Culver Ciry, Calif. 90230 Fairchild Camera and Instrument Corp.,

Mountain View, Calif. Blrtcher Corp., No. Los Angeles, Calif. American Semiconductor Corp., Arlington

Heights, Ill. 60004 Bodine Corp., Bridgeport, Conn. 06605 Bodine Electric Co., Chicago, Ill. 60618 Contmental Device Corp., Hawthorne, Calif. State Lahs Inc., N. Y., N. Y. 10003 .~mphenol Corp., Borg Insr. Div.,

Delavan, Wisc. 53115 Vemalme Prod. Co., Franklin Lakes, N. J. General Electric Semiconductor, Buffalo, N. Y. Star -Tronics Inc., Georgetown, Mass. 01830 Burgess Battery Co., Freeport, Ill. Burndy Corp., Norwalk, Conn. 06852 C.P.S. of Berne, Inc., Berne, Ind. 46711 Chandler Evans Corp., W. Hartford, Conn. Tt:ledyn Inc., Crystalonics Div.,

Camhrldge, Mass. U2140 RCA Commercial Receiving Tube and Semi­

conductor Div., Woodridge, N.J. Clarostat Mfg. Co. Inc., Dover, N. H. 03820 Dickson Electronics Corp., Scottsdale, Ariz. SolJtron Devices, Tappan, N. Y. 10983 ITT Semiconductors, W. Palm Beach, Florida Cornell Dubilter ElectrIc Co., Newark N. J. Coming Glass Works, Coming, N. Y. General Instrument Corp., Hicksville, N. Y. ITT, Semiconductor Div. of Int. T. and T,

Lawrence, Mass. Cutler-Hammer Inc .. Milwaukee, WIse. 53233 Spruce Pme Mica Co., Spruce Pine, N. C. LRC Electronics, Horseheads, Ne\v York Electra Mfg. Co., Independence, Kansas 67301 Fafnir Bearing Co., New Briton, Conn. G. E. 5chenectadv, N. Y. 12305 G. E., ElectronIc' Camp., Syracuse, N. Y. G. E. (Lamp Dlv), Nela Park, Cleveland, Ohio General Radio Co., W. Concord, Mass 01781 Amen can Zettler Inc., Costa Mesa, Calif. Hayman :tvlig. Co., Kenilworth, N. J. Hoffman Electronics Corp., El Monte, Calif. International Busmess Machines, Armonk, N.Y. Jensen MIg. Co., Clucago, IIi. 60638 Constanta Co. of Canada LtmIted,

Montreal 19, Quebec P. R. Mallory and Co. Inc., Indianapo!Js, Ind,

Code

38443 40931 42190 42498 43991

49671 49956

53021 54294 54715 56289 59730 59875 60399 61637 61864 63060

63743 65083 65092

70485

70563 70903 71126 71294 71400

71590 71666 71707 71744 71785

71823 72136 72259 72619 72699

72765 72825 72962 72982 7.3 I.J 8 73445 73559 73690 73899 74193 74861 74970 75042 75382 75491 75608 75915 76005 76149 76487 76545 76684 70854 77147 77lbb 77203 77339 77542 77030

77638 78189

Manufacturers Hame and Ad.cIress

Marlm-Rock\\Iell Corp., Jamestown, N. Y. Honeywell Inc., MInneapolis, Mlnn. 55408 Muter Co., Clucago, 111. 60638 National Co. Inc., Melrose, Mass. 02176 Norma-Hoffman Bearings Corp.,

Stanford, Conn. 06904 RCA, New York, N. Y. Raytheon Mfg. Co., Waltham, Mass. 02154 Sangamo Electric Co., Springfield, Ill. 62705 Shallcross Mfg. Co., Selma, N. C. Shure Brothers, Inc., Evanston, Ill. Sprague Electric Co., N. Adams, Mass. Thomas and Betts Co., Ehzaheth, N. j. 07207 TRW Inc. (Accessories Div), Cleveland, Ohio Torrington :tvlig. Co., Torrington, Conn. Union Carbide Corp., New York, N. Y. 10017 United-Carr Fastener Corp., Boston, Mass. Victoreen Instrument Co., Inc.,

Cleveland, Ohio Ward Leonard Electric Co., Mt. Vernon. N. Y WestInghouse (Lamp Div), Bloomfield, N. J. Weston Instruments, Weston-Newark,

Newark, N. J. Atlantic-India Rubber Works, Inc"

Chicago, 111. 60607 Amperite Co., Union Ciry, N. J. 07087 Belden Mfg. Co., Chicago, 1lI. 60644 Bronson, Homer D., Co., Beacon Falls, Conn. Canfield, H. O. Co., Clifton Forge, Va. 24422 Bussman Mfg. Div. of McGraw Edison Co.,

St. Louis. Mo. Centralab, Inc., Milwaukee, Wise. 53212 Continental Carbon Co., Inc., New York, N. Y. Coto Coil Co. Inc., Providence, R. I. Chicago Miniarure Lamp Works, Chicago, Ill. Cinch :tvlig. Co. and Howard B. Jones Div"

Chicago, Ill. 60624 Darnell Corp., Ltd., Downey, Calif. 90241 Electro Motive Mfg. Co., Willmington, COM. Nytronics Inc., Berkeley Heights, N. j, 07922 Dialight Co., Brooklyn, N. Y. 11237 General Instrument Corp., Capacitor Div.,

Newark, N. J. 07104 Drake Mfg. Co., Chicago, 111. 60656 Hugh H. Ehy, Inc., Philadelphia, Penn. 19144 Elastic Stop Nut Corp., Union, N. j. 07083 Erie Technological Products Inc., Erie, Penn. Beckman, Inc., Fullerton, Calif. 92634 Amperex l:'..lectronics Co., Hicksville, N. Y. Carling Electric Co., W. Hartford, Conn. Elco Resistor Co., New Yonc, N. Y. j. F. D. Electronics Corp., Brooklyn, N. Y. Heinemann Electric Co., Trenton, N. J. Industnal Condenser Corp., Chicago, Ill. E. F. Johnson Co., Waseca, MllID. 56093 IRC InC., PhiladelphIa, Penn. 19108 Kulka Electric Corp., Mt. Vernon, N. Y. Lafavette Industrial Electronics Jamaica. N.Y. Lind~n and Co., Providence, R. I. Litte!fuse, InC., Des Plaines, Ill. 60016 Lord Mfg. Co., Erie, Penn. 16512 Mallov Electric Corp., DetrOit, Mich. 48204 james' Millen MIg. Co., Malden,Mass. 02148 Mueller Electric Co., Cleveland, Ohio 44114 National Tube Co., Pittsburg, Penn. Oak MIg. Co., Crystal Lake, 111. Patton MacGuyer Co., Providence, R. I. Pass-Seymour, Syracuse, N. Y. Pierce Roberts Rubber Co., Trenton, N. J. Positive Lockwasher Co., Newark, N. J. Ray-O-Vac Co., Madison, Wisc. TRW, Electronic Component Div.,

Camden, N. j. 08103 General Instruments Corp., Brooklyn, N. Y. Shakeprool DlV. 01111. Tool Works,

Elgin, Ill. 60120

C::e

::-: .... -: :..-:.-.- =-"-.---: : ... "-,-" ;:; .::....-.: ~.

~ 3~: ~ ~

2:' l ~':"

::: =-­ -- ;;:.

.:.e.=.=-_=-.,;:­ S:~~ . .=.

d5S­ :;"::'.:;':- ~.~..-::=--- =. )~ - ';<:

6~~ ~ 1 -;:: .. _~ ..

; S :J DE

.: -:J" :':0:':< $ "'1J- 1

-= -~".;' " - e 1967 FEDERAL MANUFACTURERS CODE (Cont.. )

!" S "':-.e and Address Code Manufacturers Name and Address Code Manufacturers Name and Address

, ~. ~)rp.,Jamestown,N.Y.

\:.:.:meapolis, Minn. 55408 -- -':'Z), Ill. 60638 ~ _..- .\felrose, Mass. 02176

- .:..:-. 3.cdnngs Corp., :: :c....-":0rd, Conn. 06904

-, ~:. Y. - - .. Waltham, Mass. 02154

_. _' - .=,~:_-::-.: Co., Springfield, Ill. 62705 - - ".'-' ~0., Selma, N. C.

- ': : " . ==-~ b-:: .. Evanston, Ill. -.' :: -=.::-:­ -:o.,N.Adams, Mass.

. -. -- ­ ::--=:-:~ -:=0., Elizabeth, N. J. 07207 I.' ' ••• -:-:'SJnes DIV), Cleveland, Ohio - -.­ - ,,~;, -:.J .. Torrington, Conn.

'_::. := ..=:~., New York, N. Y. 10017 '- ~:: -: -=.s:;;:1er Corp., Boston, Mass. o _':::­ _ --:-.;;::t Co., Inc.,

-=.::·:eland, Ohio - =-~: ':::.::<:rnc Co., Mt. Vernon, N. Y -:: -= ~ --:-.~ Div), Bloomfield, N. J.

- .' .':-.--.:-:-.:s. Weston-Newark, .:::-·... 2.:-k, N. J.

'.' _:. -: "::-2:- Works, Inc., ::.-_:~~o, Ill. 60607 .:-.. :=--:= 1ty, N. J. 07087

~-:-.::ago, Ill. 60644 .. = -:= J., Beacon Falls, Conn.

-::liton Forge, Va. 24422 -; ~.'..= ~kGraw Edison Co.,

~": _._:5, Mo. .'.-:'" ..... ::.-.:.kee, Wisc. 53212

::.::::<­ :': .. Inc., New York, N. Y. ..:, _ ?-: Y:idence, R. 1.

:-.:. ~-::--:- ---.oC.:":"'.p Works, Chicago, Ill. -=----­ :. :--: :ward B. Jones Div., :-'_~2.ZJ, Ill. 60624 _:.:. -~J\mev, Calif. 90241

-: ". '..: ~. -: J., vi'illmington, Conn. Heights, N. J. 07922 . Y. 11237

- - .. - ::=-?, Capacitor Div., ~ ~.::.=-."-. :\. ]. 07104 _ -_~~ZJ. Ill. 60656

_­ - ?:-.:.-::.delphia, Penn. 19144 .' :::-;. L'-mon, N. ]. 07083

'Z'.::'. ?:-yjucts Inc., Erie, Penn. - :: . __ =:-:::-., Calif. 92634

::::. .. s ~) .. Hicksville, N. Y. . Hartford, Conn. '.-:­ '1'J:-1'\., N. Y.

.:: --=: -:;:: .. Brooklyn, N. Y.

78277 78488 78553 79089

79"725 "79go3 80030

80048

80131 1:50183 80211 80258 80294 83033

80431 80583 80740 81073 81143 81349 81350 81751 81831 81860

82219

82273 82389 82647 82807 83058 83186

83361 83587 83740 84411 84835

84971 86577

86684

86800

Sigma Instruments Inc., S. Braintree, Mass. Stackpole Carbon Co., St. Marys, Penn. Tinnerman Products, Inc., Cleveland, Ohio RCA, Commercial Receiving Tube and Semi­

conductor Div., Harrison, N. J. Wlremold Co., Hartford, Conn. 06110 Zienck Mfg. Co., New Rochelle, N. Y. Prestole Fastener Div. Bishop and Babcock

Corp., Toledo, Ohio Vickers Inc. Electric Prod. Div.,

St. Louis, Mo. Electromc Industries Assoc., Washington, D.C. Sprague Products Co., N. Adams, Mass. Motorola Inc., Franklin Park, Ill. 60131 Standard Oil Co., Lafeyette, Ind. Bourns Inc., Riverside, Calif. 92506 Meissner Mfg., Div. of Maguirt: Industries, Inc.

Mount Carmel, Illinois Air Filter Corp., Milwaukee, Wisc. 53218 Hammarlund Co. Inc., New York, N. Y. Beckman Instruments, Inc., Fullerton, Calif. Grayhiil Inc., LaGrange, Ill. 60525 Isolantite Mfg. Corp., Stirling, N. J. 07980 Military Specifications Joint Army-Navy Specifications Columbus Electronics Corp., Yonkers, N. Y. Filton Co., Flushing, L. 1., N. Y Barry Controls Div. of Barry Wright Corp.,

Watertown, Mass. Sylvania Electric Products, Inc., (Electronic

Tube Div.), Emporium, Penn. Indiana Pattern and Model Works, LaPort, Ind. Switchcraft Inc., Chicago, Ill. 60630 Metals and Controls Inc., Attleboro, Mass. Milwaukee Resistor Co., Milwaukee, Wisc. Carr Fastener Co., Cambridge, Mass. Victory Engineering Corp (IVECO),

Springfield, N. J. 07081 Bearing Specialty Co., San Francisco, Calif. Solar Electric Corp., Warren, Penn. Union Carbide Corp., New York, N. Y. 10017 TRW Capacitor Div., Ogallala, Nebr. Lehigh Metal Products Corp.,

Cambridge, Mass. 02140 TA Mfg. Corp., Los Angeles, Calif. Precision Metal Products of Malden Inc.,

Stoneham, Mass. 02180 RCA (Electrical Component and Devices)

Harrison. N. J. Continental Electronics Corp.

Brooklyn, N.Y. 11222

88140 88219 88419

88627 89482 89665 90201 90750 90952 91032 91146 91293 91598 91637 91662 91719 91929 92519

92678

93332

93916 94144 94154 95076 95146 95238 95275 95354 95412 95794

96095 96214 96256

96341 96791 96906 97966

98291 98821 99180 99378 99800

Cutler-Hammer Inc., Lincoln, Ill. Gould Nat. Batteries Inc., Trenton, N. ]. Cornell Dubilier Electric Corp.,

Fuquay-Varina, N. C. K and G Mfg. Co., New York, N. Y. Holtzer Cabot Corp., Boston, Mass. United Transformer Co., Chicago, Ill. Mallory Capacitor Co., Indianapolis, Ind. Westinghouse Electric Corp., Boston, Mass. Hardware Products Co., Reading, Penn. 19602 Continental Wire Corp., York, Penn. 17405 ITT Cannon Electric Inc., Salem, Mass. Johanson Mfg. Co., Boonton, N. J. 07005 Chandler Co., Wethersfield, Conn. 06109 Dale Electronics Inc., Columbus, Nebr. Elco Corp., Willow Grove, Penn. General Instruments, Inc., Dallas, Texas Honeywell Inc., Freeport, Ill. Electra Insulation Corp., Woodside,

Long Island, N. Y. Edgerton, Germeshausen and Grier,

Boston, Mass. Sylvania Electric Products, Inc.,

WObUDl, Mass. Cramer Products Co., New York, N. Y. 10013 Raytheon Co. Components Div., Quincy, Mass. Tung Sol Electric Inc., Newark, N. J. Garde Mfg. Co., Cumberland, R. 1. Alco Electronics Mfg. Co., Lawrence, Mass. Continental Connector Corp., Woodside, N. Y. Vitramon, Inc., Bridgeport, Conn. Methode Mfg. Co., Chicago, Ill. General Electric Co., Schenectady, N. Y. Ansconda American Brass Co.,

Torrington, Conn. Hi-Q Div. of Aerovox Corp., Orlean, N. Y. Texas Instruments Inc., Dallas, Texas 75209 Thordarson-Meissner Div. of McGuire,

Mt. Carmel, Ill. Microwave Associates Inc., Burlington, Mass. Amphenoe Corp. Jonesville, Wisc. 53545 Military Standards CBS Electronics Div. of Columbia Broadcast­

ing Systems, Danvers, Mass. Sealectro Corp., Mamaroneck. N. Y. 10544 North Hills Electronics Inc., Glen Cove, N. Y. Transitron Electronics Corp., Melrose, Mass. Atlee Corp., Winchester, Mass. 01890 Delevan Electronics Corp., E. Aurora, N. Y.

. ' : - ~: .. Trenton, N. J. - .' - ~ : -:: = ==-?, Chicago, Ill.

,'. ~~~:a, .\1inn. 56093 .. , -­.. :. ?::::-~'1.19108

\~:. \'ernon, N. Y. --' - - -_.~~:::-)nics Jamaica, N.Y.

-: -: ,'. . :';;:-.ce, R. 1. =:: ? .~--=-.c5, Ill. 60016

-: - ?::::-:.. 16512 . :)etroit, ~1ich. 48204

_ _ _. ~~dlden,Mass. 02148 =.;;':eland, Ohio 44114

?--. :::,j~:.-g, Penn. _ - ~:~. ':""c.:';;, Ill.

?-: :':idence, R. 1. . - :~ __~e. ~. Y.

-. :: - :.==- ':':'" Trenton, N. J. ·-·,~o--_:: --= ... ~e\',:ark, N. J.

~ ~ =-. ~ _:-. \\'1s c • . '-::::-.;;=t DiV.,

_. - :'-:-:-. ~. I. 08103 : _~.: Brooklyn, N. Y.

- :.: \Vorks, . __ . ::.( 120

300 BAKER AVENUE, CONCORD, MASSACHUSETTS 01742General Radio @

*NEW YORK Delaware, New Jersey, New York, Eastern Pennsylvania

380 Midland Avenue, Saddle Brook, NJ 07662 Telephone: (NJ) 201 791-8990 (NY) 212 964-2722 TWX: 710 9BB-2205

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(SALES) Bolton, MA 01740 Telephone: 617 646-0550

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9440 West'Foster Avenue, Chicago, I L 60656 Telephone: 312 992-0800. TWX: 910 221-5486

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15 Firstfield Road, Gaithersburg, MD 20760 Telephone: 301 948-7071. TWX: 710 828-9741

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7 Dunwoody Park, Suite 115, Atlanta, GA 30341 Telephone: 404 457-2485, (FLA) 813 531-0148

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17361 Armstrong Avenue Irvine Industrial Complex, Irvine, CA 92705 Telephone: 714 540-9830 • TWX: 910 595-1762

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