Table 9-2 Gate Times - HP 8560E Service Manual

Controller Section
Frequency Counter (8560EC)
Table 9-2 Gate Times
Counter Res
10 Hz
100 Hz
1 kHz
10 kHz
100 kHz
1 MHz
* U15 pin 10 = (FREQ COUNT input × Gate Time)/256
1. Disconnect W22 from A2J9.
2. If a 10 MHz, TTL-level signal is not present at the end of W22,
3. Check for a 10 MHz signal at A15J302. If the signal is not present at
490
Gate Time*
(U15 pin 20
low state)
200 ms
20 ms
2 ms
2 ms
2 ms
2 ms
continue with step 3. If a 10 MHz signal is present at W22, proceed
as follows:
a. Reconnect W22 to A2J9.
b. Set the spectrum analyzer to the following settings:
Span ................................................................... Zero Span
Sweep time ................................................................ 20 ms
c. Monitor the signal at A2J2 pin 21. This is an output of the
frequency counter, HBUCKET PULSE.
d. If HBUCKET PULSE is stuck high, troubleshoot the frequency
counter.
A15J302, the A15 RF assembly is probably defective.
A2TP16 A2TP15
2 MHz 4.18 kHz
2 MHz 418 Hz
2 MHz 41.8 Hz
2 MHz 41.8 Hz
2 MHz 41.8 Hz
2 MHz 41.8 Hz
Chapter 9