Agilent Technologies 54835A, 45A, 46A manual Procedure-Auxiliary Trigger Test, If a test fails

Chapter 3: Testing Performance

To test trigger sensitivity

17Adjust the horizontal sweep speed to 1 ns/div.

18Adjust the trigger level for a stable display.

19The test passes if triggering is stable. Record the result in the Performance Test Record.

20Connect the signal generator to the channel 2 input.

21Repeat steps 4 through 20 for the remaining channels.

Procedure—Auxiliary Trigger Test

The auxiliary trigger input is on the front panel of the oscilloscope near the vertical inputs. The dc input resistance of the aux trigger is 2.58kΩ, so to avoid reflections, the trigger source is back- terminated with 50 Ω.

1With an N-to-BNC adapter and BNC cable, connect the signal generator to the input of

the power splitter. Connect one output of the power splitter to the Aux Trig input through a 50 Ω feedthrough termination. Connect the other output of the power splitter to channel 1.

2Set the signal generator for 500 MHz, approximately 0 dBm.

3Set the channel 1 input to 50-Ωinput impedance and press Autoscale.

4Set the channel 1 scaling to 50 mV/div. Then set the signal generator for 6 divisions of signal (300 mVpp).

5Press the Source key (Trigger section of front panel) to highlight Aux.

6 Set the trigger level to 0.000 V.

7Slowly adjust the Trigger Level knob slightly around the 0 V setting to obtain a stable trigger. Otherwise, the test fails. Record the result in the Performance Test Record.

If a test fails

Failure of the internal trigger or external trigger sensitivity tests can be caused by a defective main assembly or attenuator. Failure of the auxiliary trigger sensitivity is caused by a problem on the main assembly or a bad input cable. If you need further troubleshooting information, go to chapter 5, “Troubleshooting.”

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