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Service Information
Measure the SRC1 & SRC2 RF Paths
The following procedure verifies SRC1 and SRC2 internal cables between the
front and rear panels.
Prepare the PNA to measure S12 with a normalization calibration using a
frequency range of 8 to 20 GHz and a power level of −8 dBm. See
Normalization Calibration" on page
be long enough to reach the rear panel of the test set.
1. Remove the SRC1 RF IN to SRC1 RF OUT rear panel jumper.
2. Connect the PNA RF Port 1 to SRC1 RF IN on the front panel.
3. Connect Port 2 to the rear panel SRC1 RF OUT.
4. The maximum loss should be < 2.5 dB.
5. Repeat the steps above with appropriate modification to measure the
Measure RF OUT (Gain and Power)
The following procedure measures gain.
Prepare the PNA to measure S12 with a normalization calibration. Refer to
"PNA Normalization Calibration" on page
GHz and a power level of 2 dBm.
1. Re-install the SRC1 RF IN to SRC1 RF OUT and the SRC2 RF IN to SRC2 RF
2. Connect PNA Port 2 cable to SRC1 RF IN on the front panel.
3. Connect the PNA Port 1 cable to the Test Set Port 1 RF OUT.
4. Issue the Test Set I/O commands 32,0 and 0,1 (enable ALC and output to
5. Issue the Test Set I/O command 32,1 (disable ALC on Port 1). Verify that
6. Repeat the previous the previous four steps for each of the remaining test
The following procedure measures the power output level.
1. Select [Sweep] > Sweep Type > CW Time. Set the sweep time to
2. Connect PNA Port 2 cable to the power sensor.
Keysight N5261/62A User's & Service Guide
SRC2 path, the maximum loss should be < 2.5 dB.
OUT rear panel jumpers.
Port 1). Verify that the gain is greater than 10 dB at all frequencies and
there are no holes or significant discontinuities in the trace. Refer to
2-15 on page
74.
the gain increases at all frequencies and that there are no holes in the
trace. Refer to
Figure 2-16 on page
set ports using appropriate SRC1/2 connections and appropriate Test Set
I/O commands.
10 seconds.
69. The cable on PNA Port 2 must
69. Use a frequency range of 8 to 20
74.
"PNA
Figure
73
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Troubleshooting
