HP 8753E - Mhz Reference Signal

4 MHz Reference Signal
This reference signal is used to control the receiver. If faulty, this signal can
cause apparent source problems because the CPU uses receiver data to control
the source. At A12TP9 it should appear similar to Figure 7-12.
-5oo.oon rleec
500.000 l-was
ch. 1 - 1.000 volts/dav
Offset - o.ooo volts
11rboro =
100 nsec/div
OPlDy
- o.oocoo *PC
sg614s
Figure 7-12. 4 MHz Reference Signal at A12TP!3 (Preset)
7-20 Source Troubleshooting