Keysight Technologies N5247B, Service Manual

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Keysight N5247B Service Guide 3-47
Tests and Adjustments
Performance Tests
3. A load is connected to Port 2.
4. At each of hundreds of points across the full frequency range of the noise
receiver, the noise jitter of the sweep is calculated from:
5. This test is repeated for the 15 and 30 dB noise gain settings.
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.
— Check for proper torquing of all semi-rigid cables in the receiver chain, and
then repeat this test.
— If the analyzer still fails this test, replace the A7 Noise Receiver board and
repeat this test. Refer to “Removing and Replacing the A4–A17 Boards” on
page 7-18 .
Noise Receiver Linearity Test
Function of the Test: To measure the relative power linearity of the analyzer’s
noise receiver.
Specification Tested: Test Port Input: Option 029 – Noise Receiver Linearity
Equipment Used:
— Z5623 Opt H01 dynamic accuracy test set
— Signal generator
— Power meter
— Power sensor
— Two test cables
Description of the Test:
The linearity of the noise receiver is tested over its full dynamic range at a sing
CW frequency. All three gain stages are tested at 2 dB increments with 8 noise
averages per point. Since the PNA-X source cannot be on while noise figure
measurements are made, an external signal source is required.
1. The signal generator is connected to the dynamic accuracy test set’s
source port and the dynamic accuracy test set’s receiver port is connected
to the PNA-X Port 2. A power sensor is connected to the dynamic
accuracy test set’s power meter port.