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ZS4000 High-Impedance Active Probe
Operation with a Teledyne LeCroy Oscilloscope
When the ZS4000 probe is connected to any compatible Teledyne LeCroy
oscilloscope, the displayed scale factor and measurement values are
automatically adjusted. A Probe dialog appears behind the corresponding
Channel dialog.
The probe can be controlled through the oscilloscope front panel:
The Volts/Div knob controls the oscilloscope's scale factor to give full
•
available dynamic range up to 2 V/div (16 V peak to peak).
The channel Offset knob controls the probe input offset circuit over its
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range of ±12 V.
High Frequency Measurements
Probe Input Loading
When you touch a probe to the circuit under test, the probe will affect your
measurement because of the probe's input impedance introduced into the
circuit. All probes present resistive, capacitive and inductive loading.
Inductive Loading (Lead Length)
A significant element in this circuit is the inductance shown in the input ground
leads of the oscilloscope probe.
The ground lead is the primary return path for the current resulting from the
input voltage acting on the probe's input impedance. The ground lead and input
lead inductances act with the probe's input capacitance to form series LC
network. The impedance of a series LC network drops dramatically at its
resonant frequency. This is the cause of the "ring" we often see after the
leading edge of pulses in measured waveforms.
12
Probe equivalent circuit
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