Tracking Generator 8593E, 8594E, 8595E, 8596E Option 010 - Agilent Technologies 8590L Service Manual

Analyzer Options and Block Diagrams

Tracking Generator 8593E, 8594E, 8595E, 8596E Option 010

Tracking Generator 8593E, 8594E, 8595E,
8596E Option 010
The following troubleshooting information is aimed at isolating
tracking-generator-related faults to either the A3A15 tracking
generator assembly or one of the other supporting assemblies, such as
A9, A10, or A3A14. The A3A15 tracking generator assembly is not
field-repairable; a rebuilt-exchange assembly is available.
If the output goes unlevelled (TG UNLVL message
displayed)
A window comparator on the A10 tracking generator control assembly
is used to monitor the control line ALC_MON (ALC Monitor) from the
A3A15 assembly. If ALC_MON is greater than +1.0 Vdc or less than
−0.10 Vdc, TG UNLVL will be displayed, indicating that the output of the
tracking generator (TG) is unlevelled. The tracking generator can
typically be set for +2.75 dBm output power and remain leveled. In any
case, the output should remain leveled for output power settings of
+1 dBm or less. It is normal for the tracking generator to be unlevelled
at frequencies below 300 kHz.The ALC_MON line is continuously
monitored during a sweep, but the TG UNLVL message will only be
displayed at the end of the sweep. For this reason, it is possible that the
output could be unlevelled during a portion of a sweep, and although
the output returns to a leveled condition by the end of the sweep,
TGUNLVL will be displayed at the end of the sweep.
If TG UNLVL is displayed, proceed as follows:
1. Check at which frequencies the output is unlevelled. Set the
analyzer to zero span and step the center frequency in 50 MHz
increments. Note at which frequencies the output is unlevelled.
2. Check at which power levels the output is unlevelled. Connect the
RF OUT 50Ω connector to the INPUT 50Ω connector. With the
analyzer in zero span, set CENTER FREQ to 300 MHz or one of the
frequencies noted in
Press the following keys.
AUX CTRL
TRACK GEN
SRC PWR ON OFF
TRACKING PEAK
Wait for the PEAKING message to disappear. Step the SRC POWER
setting in 1 dB increments and note at which power levels the output
is unlevelled. The output should be unlevelled only when the power
level is greater than +1 dBm.
410
step 1, with the analyzer in zero span.
(ON underlined)
Chapter 10