Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide 259
Baseband Generators
A2 Vector BBG Assembly Troubleshooting
Outputs
The following procedure will play a waveform file, route a marker output to all
four of the BNC connectors, and display the signal from each output on an
oscilloscope. This will verify that each is functioning as an output. This
procedure will require the use of an oscilloscope.
1. Return the instrument to a known state by pressing Preset.
2. Connect the four rear panel BNC connectors to the oscilloscope as
follows:
— PAT TRIG to Channel 1
— EVENT 1 to Channel 2
— BB TRIG 1 to Channel 3
— BB TRIG 2 to Channel 4
3. Setup the oscilloscope with the following settings:
— All Channels volts per division = 2 V
— Horizontal scale per division = 10 ns
4. Turn the modulation on by pressing Mod On/Off so that the LED below it
comes on.
5. On the source press Mode, Dual ARB, Select Waveform.
6. Highlight RAMP_TEST_WFM and press Select Waveform.
7. Turn the Arb on by pressing Mode, Dual ARB, Arb On.
8. Go to the marker selection menu by pressing More, Marker Utilities, Set
Markers.
9. Verify that RAMP_TEST_WFM is highlighted and Marker 1 is selected on
the top softkey.
10.Turn on marker 1 for every other waveform sample by pressing Set Marker
On Range of Points, # Skipped Points, 1, Enter, Apply To Waveform,
Return, Return.
11.Route marker 1 to all the BNC connectors by pressing Route To Baseband
BNCs, then:
— Route To BB TRIG 1 BNC, Marker 1
— Route To BB TRIG 2 BNC, Marker 1
— Route To EVENT 1 BNC, Marker 1
— Route To PATT TRIG BNC, Marker 1
12.The signals on the oscilloscope for all four BNC outputs should be as
shown in Figure 12-10.
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