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Service Information
Adjust ALC Levels
Background
When a component is changed in an RF or LO signal path, it is often necessary
to adjust the ALC level for the path. See
adjustments when a part is replaced.
PNA and Power Sensor Preparation
A power sensor and power meter must be prepared to make measurements at
8 GHz. This may include calibrating the power sensor with the meter and
entering a calibration factor for 8 GHz.
1. Set the PNA to measure S12.
2. Set for CW sweep at 8 GHz.
3. Set the sweep time to 5 seconds.
4. Set the power to -8 dBm.
ALC level for Port 1 (Procedure Q)
1. Prepare the PNA and Power Sensor as described above.
2. Connect PNA Port 2 to SRC 1 IN.
3. Connect the power sensor to Port 1 RF OUT.
4. Issue the Test Set I/O commands: 32,0 and 0,1 (ALC on and Port 1 RF
5. Identify the "Port 1 & 2 ALC Amp", see
6. Adjust R7: turn full CW (may require up to 30 turns) then 5 turns CCW.
7. Adjust R3: adjust for a reading on the power meter of 12.5 dB (± 0.1 dBm).
ALC level for Port 3 (Procedure R)
1. Prepare the PNA and Power Sensor as described above.
2. Connect PNA Port 2 to SRC 2 IN.
3. Connect the power sensor to Port 3 RF OUT.
4. Issue the Test Set I/O commands: 32,0 and 0,16 (ALC on and Port 3 RF
5. Identify the "Port 3 & 4 Mod/Amp," R7 and R3, see
6. Adjust R7: turn full CW (may require up to 30 turns) then 5 turns CCW.
7. Adjust R3: adjust for a reading on the power meter of 12.5 dB (± 0.1
Keysight N5261/62A User's & Service Guide
OUT).
and R3, see
Figure 2-20 on page
OUT).
2-20.
dBm).
Table 2-4 on page 78
Figure 2-10 on page
84.
Figure 2-10
for required
58. Identity R7
and
Figure
83
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Troubleshooting
