Keysight N5227B Service Guide 3-39
Tests and Adjustments
Performance Tests
If the Analyzer Fails this Test:
— Failure of the directivity error term is often due to a faulty test port coupler.
Replace the coupler and repeat this test.
— Failure of the source or load match error terms is due to faulty hardware
between the test port and the internal source. Refer to
for instructions on replacing the suspected
faulty component or assembly.
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.
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.
3.
The power sensor is disconnected and the test cable is attached to the
analyzer port under test.
4.
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.
5.
The analyzer’s receiver measurement is retrieved and compared with a
perfect sine wave. Any deviation is due to receiver non-linearity.
