HP 5501A Operating And Service Manual page 239

Table 6-4. English/Metric Pulse Output Electronics System Troubleshooting (Cont'd)
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CHECKOUT PROCEDURE
*E-Z mini test hook
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REQUIRED TEST EQUIPMENT
**Test Fixture
-
To fit on front-edge of 10763A English/Metric card for testing purposes. (To be constructed by user).
INSTRUMENT TYPE
Digital Voltmeter
Logic Probe
Oscilloscope
Frequency Counter
"E-Z mini hook7'*
Test Fixture (Front-edge)**
Individual circuit card
operating and service manuals.
Parts: 48-pin connector (e.g. HP P/N 1251-0335)
Momentary switch, SPDT
(e-g.
HP P/N 3101-1261)
REQUIRED CHARACTERISTICS
Range: -15V to +15V
+
.01V dc
TTL Level
Ability to display sig-
nals between dc and 20 MHz
Totalizing Capability
(e.g. HP 5301, 5328)
Used for test purposes
to activate output cir-
cuitry
Capable of sending
"Start" pulses
The switch sends a "Start" pulse to activate the electronics and initialize the system.
The switch should be wired so that pins S&V are shorted when the switch is pushed. Pins R&V
should
be
shorted when switch is at rest.
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Laser Coupler Cards: The minimum number of circuit cards in the coupler are as follows:
(1) 10763A English/Metric
(1) 10760A General Purpose Counter
(1) 10761A Binary Multiplier
(1) 10755A Compensation Interface
(1) 10756A Manual Compensator