Vol Ti Metro LED

8/3/2019 Vol Ti Metro LED

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PRODUCT DESCRIPTION

FEATURES 8• 200mV d.c. Full Scale Reading • 50mA (typ) @ +5V d.c. Power Supply•• User Selectable• DIL Pin Connection• Size compatible with OEM 1B (LCD module)

mm (0.31") Digit Height

Decimal Points Auto-zero and Auto-polarity

TYPICAL APPLICATIONS• High Volume, Low Cost Systems• Power Supply Monitoring

• Panel-Mount Indication• Handheld Indication

ORDERING INFORMATIONStock Number

Standard Meter OEM1B - LED

SAFETY To comply with the Low Voltage Directive (LVD 93/68/EEC), input voltages to the module’s pins must not exceed60Vdc. Theuser must ensure that theincorporation of thepanel meter into the user ’s equipmentconforms to therelevant sections of BS EN 61010 (Safety Requirements for Electrical Equipment for Measuring, Control andLaboratoryUse).

ELECTRICAL SPECIFICATIONS

No.: 695 - Page 1 of 4www.lascarelectronics.com

Thislow costsub-miniature LEDvoltmeter module is ideallysuited forhighvolumeapplications. It featuresan exceptionallylarge display in a miniature package and includes auto-zero and user-selectable decimal points. The use of low currentdisplay technology means this LED product can be considered for battery powered applications. The OEM 1B-LED isdimensionally compatible withits LCDcounterpart,the OEM1B.Connection to themoduleis viatwo rowsof pins.

Specification Min. Typ. Max. Unit

Accuracy (overall error) * 0.05 0.1 % (±1 count)Linearity ±1 count Sample rate 2.5 samples/secOperating temperature range 0 50 °CTemperature stability 150 ppm/°CWarm-up time 10 minutesSupply voltage 4.75 5 5.25 V d.c.

* To ensure maximum accuracy, re-calibrate periodically.

** Depends on reading and temperature.

Supply current ** 50 100 mAInput leakage current 1 10 pA

OEM 1B-LED 3½ Digit LED Voltmeter Module

Module shown actual size

Unless otherwise noted, specifications apply at T =25°C, V =5Vd.c. (f =40kHz) and are tested with the module configured for floating input mode.

A s u p p l y c l o c k

LASCAR ELECTRONICS LTD.MODULE HOUSE,WHITEPARISH,WILTSHIRE SP5 2SJ,UK TEL: +44 (1794) 884567FAX: +44 (1794) 884616E-mail: [email protected]

LASCAR ELECTRONICS INC.4258 WEST 12th STREET,

ERIE,PA 16505,

USATEL: +1 (814) 835 0621FAX: +1 (814) 838 8141

E-mail: [email protected]

Specifications liable to change without prior warning OEM 1B-LED Issue 5 06/2010 S.L. Applies to OEM 1B-LED/1

LASCAR ELECTRONICS (HK) LTD.8th FLOOR, CHINA AEROSPACE CENTRE,

143 HOI BUN ROAD,KWUN TONG, KOWLOON,

HONG KONGTEL: +852 2389 6502FAX: +852 2389 6535

E- mail: [email protected]



DIMENSIONSAll dimensions in mm (inches)

Page 2 of 4age 2 of 4

No.: 695 - Page 2 of 4

Vref

1 8

A/D+_

IHI

RLO

COM

RHI

ILO

DP3 2 1

TEST

V+

0V

CAL

PIN CONFIGURATION (rear view)FUNCTIONAL BLOCK DIAGRAM

CAL

CAL

1 2

. 7

( 0 . 5

0 )

5.4 (0.21)

5.5 (0.22)

1 6

. 4

( 0 . 6

5 )

V i e w i n g

A r e a

8 . 0

( 0 . 3

1 )

23.4 (0.92)

19.5 (0.77)Viewing Area

2.54 (0.10)5.0 (0.20)

1.27 (0.05)

6 . 3

5

( 0 . 2

5 )

5 . 5

( 0 . 2

2 )

www.lascarelectronics.com


1

12

6

7

Pin 1identifier





No.: 695 - Page 3 of 4www.lascarelectronics.com

PIN FUNCTIONS1. 0V Negative powersupplytothemeter.2. V+ Positive power supplytothe meter.3. IHI Positivemeasuringinput.

IHImustbenocloserthan1.5Vtoeitherthepositiveornegativesupply(seeNote).4. ILO Negative measuringinput.

ILOmustbenocloserthan1.5Vtothepositivesupply(seeNote).5. COM

6. RLO Negativeinput for the reference voltage.

7. RHI Positive input for the reference voltage.8. NC Not connected.9. DP1 Connectto0VtodisplayDP1(199.9).10. DP2 Connect to0VtodisplayDP2 (19.99).11. DP3 Connect to0VtodisplayDP3 (1.999).12. TEST Connect toV+ todisplayallsegments,except the decimal points.

Groundfor theanalogue section of theA/D converter. It is actively held at 3.05V (nom.)below

V+ andmustnot be allowed tosink excessive current(>100 A)by, for instance, connecting toahighervoltage.

A negative supply is generated internally and mirrors the positive supply. For example: if V+ is +5V, thenthe internally generated V- is -5V. When measuring with the input referenced to the same supply rail asthatofthepanelmeter,thenthelimitationsontheinputrangeare(V-+1.5V)to(V+-1.5V).

m

Note:

CIRCUIT DIAGRAM

V+2

3

45

7

6

1

IHI

ILO

COM

RHI

RLO

0V DP3

DP2

DP19

10

11

12

(199.9)

(19.99)

(1.999)

TEST


DISPLAY

CERMET

NC

0

NC8





Page 4 of 4age 4 of 4

No.: 695 - Page 4 of 4

EXTERNAL SCALINGTwo external resistors Ra andRb may be used to alter thefull scale reading (FSR) of themeter - see table. The meter

will have to be re-calibrated by adjusting the calibrationpotentiometer on the rear ofthe module.

FSR Ra Rb2V 910k 100k

20V 1M 10kVin 200V 1M 1k

2000V* 1M 100R200 A 0R 1k2mA 0R 100R

Iin 20mA 0R 10R200mA 0R 1R

m

Voltage

Current

+

-

Ra

Rb

IHI

Vi n or i nI

ILO

OEM 1B-LED

*Ensure that Ra is rated for high voltage use.

APPLICATIONSDo not connect more than one meter to the same power supply if the meters cannot use the same signalground. Takingany inputbeyond the power supply railswill damage the meter.

www.lascarelectronics.com


IHI

ILO

0V

0V

+

-

±200mV

V+

Measuring a single ended inputvoltage referenced to supply, i.e. theinput voltage and the meter's powersupply share the same 0V rail.

IHI

ILO DP1

COM

0V

0V

+

-

±200mV

+4.75 to +5.25V +4.75 to +5.25V +4.75 to +5.25V

+4.75 to +5.25V

V+

Measuring an input voltage referencedto a floating supply, i.e. the inputvoltage and the meter's power supplyare isolated from each other.Circuit shows DP1 enabled.

V+

5k

Set Zero

220k

R

IHI

ILO

COM

0V

0V

I+

I-

4-20mAcurrent loop

Measuring a 4-20mA loop current.

The meter's power supply must beisolated from the 4-20mA currentloop.

R= Reading at 20mA160

IHI

ILO

COM

0V

0V

R

V+

Measuring current.The meter's supply is isolatedfrom the current being measured.

R = 0.2IFSR

2

1

3

4 9

5

2

1

3

4

5

2

1

3

4

5

2

1

3

4

COMIHI

+5V

Load

Shunt

RL

V+

V

AS1

ILO

0VRs

7805

220nF 470nF

10uF

Vs u p p l y

Measuring supply voltage and current to a load.

Rs=200mV

Display DP1, DP2or DP3, byconnectingto 0V, asrequired.

S selects between voltage andcurrent measurement.

Raand Rb shownscaled for200V

1

F S R

(e.g. 0.1 /400mWfor2A fullscale)W

IF S R

I

Ra=1M

Rb=1k

2

1

3

4

5

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Vol Ti Metro LED