Dynamic Accuracy Test - Keysight Technologies M937 A PXIe Series Service Manual

Tests, Adjustments, and Troubleshooting
Performance Tests

Dynamic Accuracy Test

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
- U8485A USB Thermocouple Power Sensor (or N8485A power sensor with
N1914A power meter
- Two test cables
- Any necessary adapters
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 analyzer source power is adjusted until the power sensor
reads –20 dBm. The analyzer 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.
1. Refer to
Keysight M937xA PXIe Service Guide
1
)
Get the Hardware Required for your GPIB
1
Instruments.
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