Technical data

9-10 Chapter 9
Accessories Troubleshooting
Test Set Troubleshooting
• If the voltage is between 21.3 V and 22.7 V, the supply is good. Proceed with either of
the following:
— Refer to the test set manual to troubleshoot the test set and its interconnect cable
(especially if the test set LEDs don’t light).
— Continue with “Troubleshooting Control Problems in S-Parameter Test Sets.”
5. Be certain to press after all troubleshooting and return the
A9 CC switch to the “normal” position.
Troubleshooting Control Problems in S-Parameter Test Sets
The analyzer controls the test set attenuator, the transfer switch (for forward and reverse
measurements), and, in the case of the 85047A, bypasses the frequency doubler. The
associated test set interconnect connector pins are shown in Figure 9-4: refer to it as
needed.
NOTE Before continuing with these procedures, be sure the A9 CC switch is set to
the “alter” position and the value for the appropriate test set has been
“POKEd.”
Attenuation Control Voltages
Voltage levels on the pins identified in Table control the test set attenuation. Press
and enter the attenuation values listed below. After each
entry, check the pins (see Figure 9-4) for the indicated voltages.
• Proper voltages: refer to the test set manual to continue troubleshooting. For
the 85047A systems, first see the note on page 9-10 to make sure that the appropriate
test set has been “POKEd.”
• Wrong voltages: replace the A16 rear panel assembly of the analyzer.
Table 9-2 Attenuation Voltage Matrix
Attenuation HP/Agilent 85046A/B HP/Agilent 85047A
Pin 11 Pin 22 Pin 23 Pin 8 Pin 11 Pin 22 Pin 23
0 +5+5+5+5+5+5+5
10 +50+5+5+50+5
20 +5+5 0 +5+5+5 0
30 +5 0 0 +5 +5 0 0
40 0+5+5+50+5+5
50 0 0 +5 +5 0 0 +5
60 0+50+50+50
70 000+5000
POKE
0 x1 Preset
Power
ATTENUATOR PORT 1