Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide 255
Baseband Generators
A2 Vector BBG Assembly Troubleshooting
— I Bar OUT to Channel 3
— Q Bar OUT to Channel 4
3. Setup the oscilloscope with the following settings:
— All Channels volts per division = 100 mV
— Horizontal scale per division = 500 ns
4. On the oscilloscope turn channels 1 and 3 on, and channels 2 and 4 off.
5. On the source press Mode, Dual ARB, Select Waveform.
6. Highlight SINE_TEST_WFM and press Select Waveform.
7. Turn the Arb on by pressing Arb On.
8. The I and I bar signals should resemble that seen in Figure 12-7, with the
I bar signal being 180 degrees out of phase with the I signal.
Figure 12-7 I OUT versus I Bar OUT
9. On the oscilloscope turn channels 2 and 4 on, and channels 1 and 3 off.
10.The Q and Q bar signals should resemble that seen in Figure 12-8, with the
Q bar signal being 180 degrees out of phase with the Q signal.
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