HP 8560A, Руководство по обслуживанию

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Check for a 3 Vp-p waveform at using an oscilloscope (see Figure 11-3).
Check that the signal at is 10 MHz Hz (with TCXO reference) using a
frequency counter. If necessary, perform the appropriate 10 MHz reference adjustment.
If there is no problem with 10 MHz reference operation, check 10 MHz
reference operation as follows:
Set the HP 10 MHz reference to external by pressing MHz EXT .
Connect a 10 MHz, -2 signal to the rear-panel 10 MHz REF IN/OUT connector.
Check the signals at and A15J304 according to the
procedure in steps 2 through 4.
If the signals are correct in operation, but not in operation, the
problem lies in the TCXO, its voltage reference, the TTL level generator, or the A21
OCXO, if Option 003. Check these sections as follows:
On the HP press 10 MHz INT .
Check pin 3 for approximately Vdc.
Check for a 10 MHz sine wave, Vp-p, at pin 2 (non-option 003) or J305
(Option 003) using an oscilloscope.
If the signal at pin 5 is correct (see Figure but there is a problem with the
signals at or suspect or in the
10 MHz Distribution Amplifier.
G r a p h I 1 1 1 0 0
0 00 v 5 0 0 0 000
1 : 1 1
P
Figure 11-3. 10 MHz Reference at A15J302
RF Section 1