86 Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide
Self Test
Self Test Descriptions
1203 MW Multiplier Second Attenuator
This test checks the performance of the multiplier second attenuator by
referencing key attenuations states against the 0dB (thru) setting. The input
detector is switched in to measure the 0 dB state. This measured voltage is
then used as a reference for switching in and measuring subsequent
attenuations states. Once the six states are measured, two additional delta
attenuation states are measured to assure overall operation.
1204 MW Multiplier Second RF Paths
This test verifies the operation of each bandpass filter located in the second
section of the A7A2 20GHz Frequency Multiplier. A reference voltage is
established, and filter edges are checked. The difference between the voltages
are corrected for temperature and then reported for each test point.
1205 MW Multiplier Gain DAC
This test will verify the operation of the Gain DAC portion of the A7A2 20GHz
Frequency Multiplier. With a test frequency of 10.1 GHz, the Gain DAC is set to
both 0 and 4095, while the output voltage level is measured and compared to
specification. The delta between both settings is then calculated and
compared to specification.
1300 MW Mod Filter Self Tests (Model N5173B, N5183B)
The MW Mod Filter Self Tests are designed to test the operation of the A7A3
Mod Filter assembly. Output power level is verified for the frequency band of
3.2 GHz to 20 GHz. In addition, switchable filters used to minimize harmonics
are also verified.
1301 MW Mod Filter Bias Board Voltages
This test checks the power supply voltages used by the A7A3 Mod Filter
assembly.
1302 MW Mod Filter ALC Modulator
This test checks the A7A3 Mod Filter ALC modulator current for proper low,
high and delta output power performance. This test performs the modulator
measurements with the ALC off, while the ALC Level DAC, RF and MW Mod
Offset DAC’s, as well as the RF and MW Mod Gain DAC’s, are at nominal
settings.
1303 MW Mod Filter Pulse Modulation
This test checks the functionality of the Pulse Modulation performance of the
A7A3 Mod Filter assembly.
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