Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide 141
Troubleshooting
Unleveled Issues
6. Verify that the Set Atten setting is set to 0 dB.
7. Referring to Figure 6-2, remove W20 from A3 J2002.
8. Connect a spectrum analyzer to A3 J2002 through a 20 dB attenuator with
the following settings:
— Center Frequency = 3 GHz
— Span = 20 MHz
— Reference Level = +20.0 dBm
9. Measure the level of the 3 GHz output on the spectrum analyzer, adding
20 dB to account for the attenuator:
— If the signal level does not measure at least +20 dBm replace the A3
RF assembly.
— If the signal level measures greater than +20 dBm proceed to
step 10.
10.Remove the 20 dB attenuator and connect the spectrum analyzer to the
signal generator RF output.
11.Referring to Figure 6-2, reconnect W20 to A3 J2002.
12.Remove W23 from A3 J6000 and connect a DC voltmeter to the loose end
of W23.
13.Verify that the DC voltage measured at the output of W23 is at least +10V.
— If the DC voltage measures at least +10V proceed to step 14.
— If the DC voltage does not measure at least +10V replace the A7
Micro-Deck assembly.
14.Adjust the power level of the signal generator to -25 dBm by pressing
AMPTD, -25 dBm.
15.Verify that the DC voltage measured at the output of W23 measures -8V
or less:
— If the DC voltage measures -8V or less replace the A3 RF assembly.
— If the DC voltage does not measure -8V or less replace the A7
Micro-Deck assembly.
3.2 GHz to Maximum Frequency Limit
In this frequency range the ALC detector, reference DAC, integrator, summing
amplifier, and modulator used are all located on the A7 Micro-Deck assembly.
Since all the ALC circuitry for this frequency range is contained on the A7
Micro-Deck all that will need to be determined is if the A3 RF assembly is
providing the correct power level and frequency required. Use the following
procedure to isolate an internal ALC unlevel condition in this frequency range.
To Next Page
Loading...
Need help?
General
