Agilent Technologies 1147A, User Manual

Page: 13 / 24

13
Demagnetization and Zero Adjustment
Refer to the Description of Parts section of this manual when performing
this procedure
1
Allow both the Infiniium oscilloscope and the probe to warm up
for at least 30 minutes before making these adjustments.
2
Ensure that the channel offset is set to 0 V on the oscilloscope
channel to which the probe is connected.
3
Ensure that the probe sensor is NOT clamped around any
conductors.
4
Slide the probe sensor Opening Lever into the Locked position.
5
Press the DEMAG button on the terminator.
A demagnetization waveform will be displayed for a short time on the
channel to which the probe is connected. Wait until this waveform is
no longer displayed.
6
When the demagnetization waveform is no longer displayed, adjust
the
ZERO ADJ control on the probe terminator to move the trace
for the channel to which the probe is connected as close as possible
to the 0V position. If the
ZERO ADJ control cannot center the
trace adequately, then do the following:
a
Move the ZERO ADJ control to a midrange position.
b
Carefully adjust the Coarse Adjustment Trimmer on the probe sensor
to move the trace on the channel to which the probe is connected as
close as possible to the 0V position.
c
Adjust the ZERO ADJ control on the probe terminator to move the
trace for the channel to which the probe is connected as close as
possible to the 0 V position.
Measurement Procedure
Ensure all safety warnings and precautions are followed.
1
Perform the Demagnetization and Zero Adjustment procedure
above.
2
Clamp the sensor head around the conductor to be measured.
3
To obtain the best accuracy, ensure that:
a
The current direction indicator on the sensor aligns with actual current
direction in the conductor.
b
The sensor opening lever is in the Locked position
c
The cable is centered in the sensor head.
CAUTION