Specifications

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 Fs width, 200 KHz

5 U26 pin 11 TTL Level Negative going pulses; 1 Fs width, 200 KHz

6 U24 pin 1 ECL Level Negative going pulses; 1 Fs 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

Test Point Expected Result

1 U14 to U8 pin 9 TTL Level Positive going pulses; 1 Fs width, 200 KHz

2 U10 pin 1, U39 pin

TTL Level Negative going pulses; 10 ns width, 200 KHz

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