PSM1700 PsimetriQ user manual
9-4
9.1 Trimming x10 oscilloscope probes
To use a x10 oscilloscope probe at high frequency the
probe needs to be trimmed to match the input capacitance
of the instrument. A small plastic screwdriver is provided
with each probe for this purpose.
To the probes, connect the instrument output across a
convenient resistor (anything above 1k) using the supplied
BNC to crocodile clip output lead. Connect the probes from
CH1 and CH2 also across the resistor.
Press OUT and set the generator to 1kHz squarewave with
2V amplitude. Press HARM to invoke harmonic analyser
mode and select third harmonic.
With both probes set to x1, the measured third harmonic
should read 33.33% +/- 0.03%. Select x10 on one of the
probes and adjust the trimmer in the body of the probe
until the third harmonic again reads 33.33%. Switch the
probe back to x1 and verify that the third harmonic reads
the same. Repeat the adjustment if necessary. Select x10
on the other probe and adjust in the same way.
To verify the adjustment at higher frequency, select the
25
th
harmonic for measurement. The reading should be
approximately 4% in both x1 and x10 settings.
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