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HVD3102 and HVD3106 High-Voltage Differential Probes
High common mode rejection requires precise matching of the relative gain or attenuation in the
+ and – input signal paths. Mismatches in additional parasitic capacitance, inductance, delay,
and a source impedance difference between the + and – signals will lower the common mode
rejection ratio. Therefore, it is desirable to use the same length and type of wire and connectors
for both input connections. When possible, try to connect the inputs to points in the circuit with
approximately the same source impedance.
To minimize the amount of bench space occupied, the probes may be stacked on one top of
another during usage. Since the probe body generates heat, and the stacking reduces cooling, it
is recommended that ambient temperatures not exceed 30 degrees C while the probes are
stacked and in operation. The exceptional CMRR performance of the probe should prevent
interference between probes when they are stacked, but care should be taken to separate the
probe leads during operation.
Operating with an Oscilloscope
When the probe is connected to a Teledyne LeCroy oscilloscope, the displayed scale factor and
measurement values will be adjusted to account for the effective gain of the probe. The probe's
internal attenuation and offset can be conveniently controlled through the Probe dialog, which is
added to the oscilloscope's Channel setup dialogs when a probe is detected.
Probe Volts/Div and Attenuation
The Volts/Div knob controls the oscilloscope's scale factor and the probe's internal attenuation
to give full available dynamic range from 100 mV/Div to 400 V/Div. Some transition of the scale
factor will result in a change of attenuation.
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