User manual

ZD Series Differential Probes
ZDSERIES-GSM-REVA
32
Probe Input Loading
Attaching any probe to a test circuit add some loading to the circuit under test. In most
applications the high impedance of the probe, compared to the impedance of the circuit under
test, imparts an insignificant load to the test circuit. However, at very high frequencies the
capacitive reactance of the probe tip or lead may load the circuit enough to affect the
measurement. These probes are designed to minimize these effects at high frequencies. Refer
to the figures in this topic for equivalent input circuit information.