E L D I T E S T
Basic Operation
The GE2500 Series are passive high impedance voltage oscilloscope probes de-
signed and calibrated for use with general purpose oscilloscopes having an input
impedance of 1 MΩ shunted by 13 pF, however selected models may be compen-
sated for use with instruments having an input capacitance between 10 to 30 pF.
Models with RA suffix are compatible with readout function oscilloscopes that au-
tomatically detect probe attenuation and adjust their readout scale accordingly.
Probe Compensation
Proper compensation of the probe is required to assure amplitude accuracy of the
waveform being measured by matching the probe to the oscilloscope’s input ca-
pacitance. Compensation should be adjusted whenever the probe is connected to
or transferred between oscilloscopes.
Low Frequency (LF):
• Apply a 1 kHz square wave to the probe or connect to the oscilloscope’s
calibrator output.
• Adjust the trimmer located on the probe body (LF) for a flat topped square wave
per center illustration.
Procedure:
Incorrect Correct Incorrect
WARNING
.
To avoid electric shock, keep fingers behind the probe’s finger guard
during use.
High frequency (HF):
(Should seldom require adjustment, however, if adjustment is required)
• Apply a 1 MHz square wave to the probe (<0.7 ns rise-time).
• Adjust trimmer located on the probe body (HF) toward cable end for a flat
topped square wave per center illustration.
Incorrect Correct Incorrect
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