Keysight Technologies N5261A, Руководство пользователя и сервисное руководство

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Service Information
2-
Measuring Test IF and REF IF Path Loss on the N5261A
The IF paths for the N5261A are not switched, see Figure 2-1 on page 51 .
The cable connected to PNA Port 1 must be long enough to reach the rear
panel of the test set.
1. Prepare the PNA to measure S12 with a normalization calibration. Select a
frequency range of 10 to 20 MHz and a power level of
−
20 dBm. See “PNA
Normalization Calibration” on page 69 .
2. Measure the IF signal paths listed below. Connect PNA Port 2 cable to the
test set front panel
and the PNA Port 1 cable to the rear panel IF OUT
.
Maximum loss should be < 0.5 dB.
— Port 1 TEST IF to A (rear panel)
— Port 1 REF IF to C (rear panel)
— Port 2 TEST IF to B (rear panel)
— Port 2 REF IF to D (rear panel)
Measuring Test IF and REF IF Path Loss on the N5262A
The IF paths for the N5262A are switched (i.e. multiplexed), see Figure 2-2 on
page 5 2 .
The cable connected to PNA Port 1 must be long enough to reach the rear
panel of the test set.
1. Prepare the PNA to measure S12 with a normalization calibration. See
“PNA Normalization Calibration” on page
69
. Select a frequency range of
10 to 20 MHz and a power level of
−
20 dBm. See “PNA Normalization
Calibration” on page
69
.
2. Measure each path listed in Table
2- 3
on page
7 6
for N5262A. Each path
is defined by entries in the “From:” and “To: N5262” columns.
- For a given IF path, issue the appropriate command then measure the
gain (loss) and connect PNA Port 2 to the appropriate connection on the
front panel of the test set.
- The maximum path loss is listed for each path.
- There should be no holes or significant discontinuities on the traces.
Figure 2-1
7
, Figure 2-1
8
and Figure 2-1
9
on page
7 7
are examples of
acceptable traces.
Keysight N5261/62A User’s & Service Guide 75