Use Of Different Probe Types; Safety Notice - Hameg Instruments HZ530 Manual Del Usuario

Use of different probe types

Safety Notice

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used, the insertion loss of this cable must be added to the output
values at the higher frequencies.
For the normal measurements, the probes are connected to a
spectrum analyzer. These instruments generally have an input
impedance of 50
impedance for the probes. If an oscilloscope or measurement
receiver with a different impedance is used, the correct (50
termination impedance must be used. If the 50
impedance is not used, the probe output is not calibrated.
The different probes are used for different tests since their electric
characteristics are quite different. The E-field probe is normally used
at a distance of 0.5 to 1.5 meters from the RFI source. The thereby
observed frequencies are then further localized near the source by
use of the H-field probe. The high impedance (Hi-Z) probe makes
further localization possible by directly contacting the source and
to judge the effectiveness of suppression measures.
Because of its electrical characteristics, the E-field probe is not
intended to perform measurements within an equipment or di-
rectly on parts that are live. Electrical contact of the antenna with
live parts exceeding 20 V
to the built-in pre-amplifier. These limits also apply to the Hi-Z pro-
be; however, electrical contact to parts that are below 20 V
+10 ΩdBm are permitted.
Basically, it is not permissible to perform measurements on
parts that are live above 40V. Since a significant part of the
measurements are performed on exposed parts, it is a pre-
requisite that the user is familiar with any potential electrical
hazard. Under no circumstances may the probes be used
on equipment that is not safety grounded. When in doubt,
a safety isolation transformer must be used.
Think also of ecology. The power supply for the probes should be,
Ω
. This impedance is the normal termination
or +10 dBm at RF may cause damage
DC
Änderungen vorbehalten / Subject to change without notice
Ω
)
Ω
termination
or
DC