Cal Osc. Troubleshooting Mode - HP 8560A Service Manual

Spectrum analyzer
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printer is connected, press Print Page to provide a hard copy of the currently displayed
screen (the softkey labels will not be printed).
Each test connector has fifteen pins (one pin is missing to act as a key). The pins contain
eight measured signal lines (measured signal lines denoted as MS1 through MSS), one input
signal line (OSl), one ground, and five pins encoding a five-bit connector address.
The TAM needs to probe each assembly's Revision Connector once; subsequent readings
are not necessary. It is possible, for example, to probe the A5 IF Assembly, then the A4
Log Amplifier Assembly, and then return to A5 without having to re-probe A5's Revision
Connector. However, the Revision Connector must be re-probed if the spectrum analyzer is
returned to normal operation and then back to TAM control. (This is also true if the analyzer
is turned off.)

Cal Osc. Troubleshooting Mode

The Cal Osc. Troubleshooting Mode enables front-panel control of the Cal Oscillator on the
A4 assembly. The Cal Oscillator can be fixed-tuned to three different frequencies. The Cal
Oscillator may also be set to one of five sweep widths, centered at 10.7 MHz.
Fixed-tuned settings:
11.5 MHz
10.7 MHz
9.9 MHz
Sweep-width settings:
20 kHz
10 kHz
4 kHz
2 kHz
The Cal Osc. Troubleshooting Mode sends the Cal Oscillator output (-35 dBm) to the A5 IF
Assembly. On the A5 IF Assembly all crystal filter poles are shorted, all LC poles enabled,
and the 15 dB attenuator disabled. Signals from the RF Section are attenuated as much as
possible.
6-14 General Troubleshooting

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