Keysight N5244A/45A Service Guide 3-43
Tests and Adjustments
Performance Tests
— If the analyzer fails this test repeatedly, replace the A23 mixer brick for a
Port 1 or Port 2 failure or the A24 mixer brick for a Port 3 or Port 4 failure,
then repeat this test. Refer to
“Removing and Replacing the A27 and A28
— If the analyzer still fails this test, replace the A12 SPAM board and repeat
this test. Refer to
“Removing and Replacing the A4–A17 Boards (For
analyzers with serial numbers prefixed MY/SG/US5150 and below)” on
and
“Removing and Replacing the A4–A17 Boards (For
analyzers with serial numbers prefixed MY/SG/US5201 and above)” on
.
System Noise Figure Test
Function of the Test: To measure the noise figure of the PNA-X noise receiver
system.
Specification Tested: Test Port Input: Option 029 – Receiver Noise Figure
Equipment Used:
— 346C noise source
— BNC cable
Description of the Test:
1.
The analyzer is Preset.
2.
The 346C noise source is connected to Port 2. A BNC cable is connected
between the noise source and the +28V VDC output on the rear panel of
the analyzer.
3.
The analyzer is set to make a noise power density measurement with an
800 kHz noise IF bandwidth using hundreds of points across the full
frequency range of the noise receiver.
4.
The ENR data file for the noise source is read into the analyzer.
5.
The noise source is turned on and a hot noise response is measured, Phot.
6.
The noise source is turned off and a cold noise response is measured,
Pcold.
7.
The system noise figure for each point is calculated from:
8.
This test is repeated for 2, 4, 8, and 24 MHz noise IF bandwidths.
If the Analyzer Fails this Test:
A failure of this test indicates a fault in the noise receiver chain. This can
indicate a faulty assembly or a loose cable.
Содержание PNA-X N5244A
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Страница 90: ...3 62 Keysight N5244A 45A Service Guide Tests and Adjustments Adjustments 3 ...
Страница 146: ...4 56 Keysight N5244A 45A Service Guide Troubleshooting Instrument Block Diagrams Sheet 4 4 ...
Страница 155: ...Keysight N5244A 45A Service Guide 5 9 Theory of Operation Synthesized Source Group Operation Figure 5 3 Source Group ...
Страница 174: ...5 28 Keysight N5244A 45A Service Guide Theory of Operation Receiver Group Operation 5 Figure 5 6 4 Port Receiver Group ...
Страница 175: ...Keysight N5244A 45A Service Guide 5 29 Theory of Operation Receiver Group Operation Figure 5 7 2 Port Receiver Group ...
Страница 188: ...5 42 Keysight N5244A 45A Service Guide Theory of Operation Noise Measurement Group Operation Option 029 5 ...
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