australian_army - 7610-66-036-9860 - 30_october_1970

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RESTRICTED7610-66-036-9860

The information given in this Documenf is nor to be commun-icated either directly or indirectry to the press, or to any

personnot aulhorised to receive it.

AUSTRALIAN ARMY

USER HANDBOOK

FIRING DEVICE ELECTRICAL

1375-66-034-3976F7, SIX CIRCUT

SPECIFICATION : ARMY (AUST.) 188

RESTRICTED


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RESTRICTED

7610-,66-036-9860

AUSTRALIAN ARMY

USER HANDBOOK

FIRING DEVICE, ELECTRICAL

SPECIFICATION: ARMY (AUST.) 188Prepared and Issued under the Direction of the Master General of the Ordnance.

30 Oct 70 RESTRICTED

MGO


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AMENDMENT ECORDAAO'S AmendmentNo . Signotureqnd Dote

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PREFACE

The Fir ing Device, Electr ical, F7, Six Circuit provides a facilityfor testing and firing a circuit for M18A1 (CLAYMORE) mines with the M4 blastingcap or flares and other devices ini tiated by a No.33 electr ic detonator.

The device, when used with a 90V battery, 6135-66-015-9365,Battery Dry, HT/Bias 90/7.5V1 (as used with the RS A510), i s crapable of fi ring theabove electric detonators at distances up to 300 metres when using D10 electriccable.

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CONTENTS

CHAPTER ONE - GENERAL DESCRIPTIONPAW. PAGE

SECTION 1 PURPOSE A ND FACILITIES 1-

3 1

SECTION 2 GENERAL CONSTRUCTION 4 - 6 3

SECTION 3 DIMENSIONS AND WEIGHT 7 3

CHAPTER TWO - OPERATING INSTRUCTIONS A NDUSER SERVICING

SECTION 4 PREPARATION FOR USE 8 - 1 4 4 - 5SECTION 5 SETTING UP 15 - 21 5 - 6

SECTION 6 OPERATION 22 6

SECTION 7 USER SERVICING 23 - 24 7

ILLUSTRATIONS

FIG. NO.

1

2

COMPLETE EQUIPMENT SCHEDULE

FIRING DEVICE SHOWING BATTERY

FITTING ( l ) AND BATTERY CAP (2)


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FIGURE 1. - COMPLETE EQUIPMENT SCHEDULE FIRING DEVICE,ELECTRICAL, F7, SIX CIRCUIT

Haversack No. 1. (8465-99-940-0047).Firing Device, Electrical, F7, Six Circuit (1 375-66-034-3976)Cable Assembly, Special Purpose, Electrical, 2 pt, 3 ft. (5995-66-029-0564)

(2 off)

Battery Dry Cell 9O/7.5V (61 35-66-01 5-9365).Battery Dry Cell 1.5V (Eveready 915 or 1015). (6135-00-120-1030)

(2 off - one in item 2).

Pliers, Combination, side cutting, 6 inch. (5120-66-014-0251)

Screwdriver, flat tipped, 1 .3/4 i n X 1/8 in (5120-66-014-6415).Adapter, Plug, Firing Device to Claymore (1375-66-035-6280) 6 off.

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FIRING DEVICE, ELECTRICAL, F7, SIX CIRCUIT

CHAPTER ONE - GENERAL DESCRIPTION

SECTION 1 - PURPOSE AND FACILITIES

1 . The Firing Device, elec trical, F7, six circuit i s used for testing thefi ri ng circuit of an elect ric detonator, testing the condition of the external battery,

and f ir ing the detonator when required.

2. The equipment consists of a robust case with:

a movable carrying handle

twelve terminals for the termination of six pairs of firing wires

two screw terminals for the connection of an external 90 V battery,

6135-66-015-9365, Battery Dry bias, 9 0B 3 V (as used with theRadio Set A510)a meter, fi tted w ith an internal li ght source, which i s used to

measure the resistance of the firing circuit or the state of theexternal 90 V battery

a sealed battery compartment containing a 1.5 V battery for

resistance measurement

a potentiometer to zero the meter for resistance measurement

switches to enable the testing function to be performed

three switches, 2-way centre stable, for selection of the desired

firing circuit

a push button F l R E switch. This switch must be pressed at the sametime as the desired selector switch to fi re the detonator. When the

device i s switched to the test position the F l R E switch i s inoperative.

3 . When used with the 90 V battery the device i s capable of initiating an

M4 blasting cap or a No.33 electric detonator through 300 metres of D10 electriccable. An alternative wire may be used but the single loop resistance must be less

than 50 ohms, ie, register i n the green portion of the scale on the test meter.


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FIG 2-FIRING DEVICE SHOWING BATTERY FITTING(1) AND BATTERY CAP(2)


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SECTION 2 - GENERAL CONSTRUCTION

GENERAL (See Figs 1 and 2)

4. The case i s moulded polycarbonate and i s not sealed. However, al l

components are of sealed construction except for the 1.5 V battery which i s in asealed compartment.

5. A raised ridge on the upper face protects the switches and meter from

accidental damage when dropped or knocked.

CONTROLS AND CONNECTIONS

6. The location of a ll controls and terminals i s shown i n Figs. 1 & 2 . Themethod of connection and the use of the controls i s detailed i n Chapter Two.

SECTION 3 - DIMENSIONS AND WEIGHT

Firing Device Battery

Length 83 inches l 5 inchesWidth

Depth

6 ;

Weight

33 U

33 W 2: 1 13 lb 2 Ib 12 oz


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CHAPTER TWO - OPERATING INSTRUCTIONS

AND USER SERVICING

SECTION 4 - PREPARATION FOR USEP

8. The Firing Device, Electrical, F7, Six Circuit provides a check of its

own 1.5 V battery and the external 90V battery,

9. To check that the 1.5 V battery (size AA) i s in place, unscrew the slotted

cap marked 1.5 V BATTERY, If required, insert a battery wi th the positive teat ofthe battery point ing down. Replace the screw cap and tighten securely to ensure a

good electrical contact and sealing against the rubber gasket.10. Using the screwdriver provided, connect the battery lead to the screw

terminals on the end of the fir ing device, the red lead to the positive terminal.

Insert the plug in the 90V battery socket.

11 . Switch the TEST ARM lever to TEST, press the TEST toggle switch to

CHECK ZERO and set the meter to the right hand edge of the green sector (zero)

with the SET ZERO knob. If the meter wi l l not zero, check that the cap of thebattery compartment i s screwed tight, thus making good electrical contact. (Do not

remove the rubber gasket from the cap). If the cap i s secure, then the 1.5 V batteryi s flat and must be replaced. Release the TEST switch.

12. Press the TEST switch to TEST BATTERY, observe the meter reading andthen release the switch. If the meter reads in the green portion the 90V battery i sserviceable.

13. To check that each SELECTOR switch i s functioning correctly, place a

wire across each pair of firing wire terminals in turn. While the wire shorts out the

terminals, press the appropriate SELECTOR switch toward its pair of terminals. The

meter wi l l read zero, ie, the right hand side of the green sector. On releasing the

switch the meter needle will return.to the left-

hand side,


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14. This completes prel iminary testing of the device, and i t i s ready for setting

up. Disconnect the plug from the 90 V battery.

SECTION 5 - SETTING UP

15. Position mines and flares i n the required tact ical position not more than

300 metres from the fir ing position. Each fi ri ng device i s packed with six adapter,

plug, Fir ing Device to Claymore. These plugs can be screwed on to the end of

bared D10 electr ic cable and then plugged into the M4 blasting cap lead.

16. Attach the D 10 elec tr ic cable t o the detonator wires, anchor the cable

end, and run out the cable to the firin g position. Ident ify the cir cui t by a tag onor knots in the cable, eg, two knots i n the pai r for M ine 2 or 2 knots i n one lead

only for Flare 2. Write the circu it identification on the writing plate next t o the

selector switch with a Chinagraph or lead pencil . This ident if icat ion can be erased

by rubbing wi th a wet finger.

17. When a l l cables are laid, strip ha lf an inch of insulation from each wire.

Without the 90 V battery connected to the case attach each pair of firing wires to

the appropriate pai r of terminals, say, flares on the lef t and mines on the right o f

the case, although any combination of mines and flares to a to tal o f 6 can be used.Keep the connections in the same order as the position o f the weapons; this w i l l

assist i n identi fication o f the correct selector to use when fi ring. When using D10

elect ric cable i n semi-permanent installations solder t i n the bared wires. This

prevents the steel strands in the cable from rusting.

18. With the firing wires connected:

a. switch the ARM-TEST lever to TEST

b. hold the TEST switch to CHECK ZERO

c. adjust the SET ZERO control until the meter reads to the right-hand

side of the green sector, and then release the TEST switch.

d. Push each selector switch i n turn to each mine (or flare) posi tion and

check that the meter reading i s i n the green sector for al l fir ing

circuits.


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NOTE

I f the resistance measurement made i n para. 18d.

i s i n the red sector o f the meter, either too muchwire has been used or a poor joint i s responsible

for the high resistance. A reading i n the whi te

central sector will be satisfactory i f the test of

the 90 V battery is wel l i n the green sector.

19. Connect the plug to the 90 V battery and press the TEST switch to TEST

BATTERY, observe the meter reading and release the switch. If the meter reads in

the green sector the90V

batteryi s

serviceable.

WARNING

D O NOT -HOLD THE TEST SWITCH TO TESTBATTERY FOR MORE THA N FOUR SECONDS

20 . Each time the battery i s tested the power consumed from i t i s far in excess

of that required to fi re a detonator, therefore this testing should be kept to a

minimum. One test per day should be adequate. If the battery has been disconnected

and re-connected, then a cpick flick of the test switch will be sufficient to prove thatconnection has been made.

21. The system i s now ready for use.

SECTION 6 - OPERATION

22. When it i s required to fi re one o f the weapons:

a. swing the ARM-TEST lever to ARM

b. hold the wanted SELECTOR switch to connect the required firingcircuit and press the F I RE button. Select only one weapon at atime for reliable firing.


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NOTE

In the event of a failure i n the firing device,

e m e rg e nc y f i r i n g can be achieved by

r e m o v i n g t h e battery leads from their

terminals and t o u c h i n g these two leads

across the fir ing wire t e r m in a l s of theweapon to be detonated.

SECTION 7 - USER SERVICING

23. Should

soon as possible.

and replacing the

the equipment be immersed in water, shake out a l l excess water as

Other than keeping the uni t clean, par ticu larly the terminal beds,

batteries, there i s no servicing that can be performed by the user.

24. Ensure that, in use, the ends of the fir ing wires are stripped of the ir

insulation, and that the terminals are screwed down firmly with the fingers only.

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australian_army - 7610-66-036-9860 - 30_october_1970