Teledyne LeCroy AP034 - Manual (Page 46)

AP034 Active Differential Probe
40 922261-00 Rev A
C. Adjust Low Frequency CMRR (R7)
1. Leave the BNC cable connected to the probe end of the ProBus extension cable. Connect a
50 Ω BNC Through Terminator on the other end of the BNC cable. Connect the male end of
the 50Ω terminator to channel 3 on the scope. The scope end of the ProBus extension
cable should remain connected to channel 1 of the scope, although there is no signal cable
connected.
2. Connect a BNC cable from the output of the Function Generator to the Channel 2 input of
the oscilloscope.
3. Connect a second BNC cable from the Function Generator SYNC OUT to the external trigger
input of the oscilloscope.
4. Set the Function Generator waveform to Sine and the frequency to 70 Hz.
5. Set the oscilloscope as follows:
Display: Channel 2
Channel 1 VOLTS/DIV: 2 mV/div
Channel 2 VOLTS/DIV: 5 V/div
Channel 2 Coupling: %___
Channel 3 VOLTS/DIV: 2 mV/div
Channel 3 Coupling: AC 1M+
Trigger on: EXT10
cplg EXT10: DC
TIME/DIV: 10 ms/div
Acquisition Mode: NORMAL
6. Adjust the trigger level for a stable display.
7. Set the Function Generator output voltage to 20 V
p-p
as displayed on the oscilloscope.
8. Disconnect the output cable of the function generator from the channel 2 input of the
oscilloscope and reconnect it to the Common Mode Drive No Termination connector of
the AP033/AP034 Calibration Fixture.
9. Carefully align the four pins that correspond to the Common Mode Drive No Termination
portion of the AP033/AP034 Calibration Fixture with the input receptacles in the AP034
probe head. Press the probe into the fixture to fully engage the pins.