Dynamic Accuracy Test - Keysight N5227A Service Manual

Tests and Adjustments
Performance Tests

Dynamic Accuracy Test

This description applies to all N522xA, N5231A/32A/34A/35A/39A, and N5247A instruments.
Function of the Test: To measure the relative power linearity of the analyzer's receivers.
Specification Tested: Test Port Input–Dynamic Accuracy
Equipment Used:
• U3020AD01 dynamic accuracy test set
• Signal generator
• Power meter
• Power sensor
• Two test cables
Description of the Test:
1. The analyzer's test ports are tested separately at a specific CW frequency and a reference power level of
-20 dBm.
2. A test cable is connected between the analyzer's source port and the dynamic accuracy test set's
Source 1 In port. A test cable is connected between the signal generator and the test set's Source 2 In
port. A test cable is connected to the test set's Receiver Out port, and the power sensor is connected to
the end of this cable.
3. The test set's output attenuator is set to 20 dB. With the signal generator RF turned off, the PNA source
power is adjusted until the power sensor reads -20 dBm. The PNA source is then turned off, the signal
generator RF is turned on, and the signal generator power is adjusted until the power sensor reads -20
dBm.
4. The power sensor is disconnected and the test cable is attached to the analyzer port under test.
5. Both sources are turned on and the signal generator's frequency is set to 2 Hz above the analyzer's
frequency. By combining these two signals together, the resultant signal will be a perfect sine wave with
a magnitude which varies from -17 dBm to -23 dBm at a rate of 2 Hz.
6. The analyzer's receiver measurement is retrieved and compared with a perfect sine wave. Any deviation
is due to receiver non-linearity.
7. The test set's output attenuator is changed in 5 dB steps from 0 to 60 dB, and this measurement is
repeated.
8. With the 1 dB of overlap in each measurement, the data for each attenuator setting can be stitched
together to provide a complete receiver linearity profile from +3 dBm to -63 dBm.
9. This test is repeated for each receiver.
If the Analyzer Fails this Test:
• If the analyzer fails this test, rerun the test.
• 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
A27 and A28 Mixer Bricks" on page
• If the analyzer still fails this test, replace the A12 SPAM board and repeat this test. Refer to
and Replacing the A4–A17 Boards" on page
3-38
7-30.
7-10.
PNA Series Microwave Network Analyzers
"Removing and Replacing the
Service Guide N5227-90001
N5227A
"Removing