3152A User Manual
Maintenance And Performance Checks 5-30 Racal Instruments
©
2001
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
μ
s width, 200 KHz
5
U26 pin 11
TTL Level Negative going pulses; 1
μ
s width, 200 KHz
6
U24 pin 1
ECL Level Negative going pulses; 1
μ
s width, 200 KHz
Change the Model 3152A 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
Step
Test Point
Expected Result
1
U14 to U8 pin 9
TTL Level Positive going pulses; 1
μ
s width, 200 KHz
2
U10 pin 1, U39 pin
13
TTL Level Negative going pulses; 10 ns width, 200 KHz