Racal Instruments 3152, User Manual

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Maintenance and Performance Checks 5-24
Change the Model 3152 setting to triggered. Use an external
pulse generator to apply a TTL level, 200 KHz signal to the
TRIG IN connector. Proceed with the checks given in Table
5-7b.
Table 5-7b Engine Board Checkout Procedure - #2
Step Test Point Expected Result
1 U13 pin 16 TTL Level, 200 KHz
2 U13 pins 8 TTL Level Positive going pulses; 10 ns width, 200 KHz
3 U39 pin 13 TTL Level Negative going pulses; 10 ns width, 200 KHz
4 U39 pin 8 TTL Level Positive going pulses; 1
F
s width, 200 KHz
5 U26 pin 11 TTL Level Negative going pulses; 1
F
s width, 200 KHz
6 U24 pin 1 ECL Level Negative going pulses; 1
F
s width, 200 KHz
Change the Model 3152 setting to delayed trigger and
change delay to 100. Use an external pulse generator to
apply a TTL level and 200 KHz signal to the TRIG IN
connector. Proceed with the checks given in Table 5-7c.
Table 5-7c Engine Board Checkout Procedure - #3
Ste
p
Test Point Expected Result
1 U14 to U8 pin 9 TTL Level Positive going pulses; 1
F
s width, 200 KHz
2 U10 pin 1, U39 pin
13
TTL Level Negative going pulses; 10 ns width, 200 KHz