User manual

5
Subject to change without notice
Im po r ta nt hi n ts I n t r o d u c t i o n
Introduction
Probe power is supplied directly from HAMEG
HM5010 / HM501 / HM550 Spectrum Analyzers.
In case different instruments are used, probe
power is supplied from an optional 6 V
DC
power
supply.
The connection of the probe to the spectrum
analyzer, oscilloscope or measurement receiver
is made via a supplied SMA- to N-connector cable
of approximately 1. meters length. This length
is generally sufcient for most measurements.
If for special reasons a longer cable is used, the
insertion loss of this cable must be added to the
output values at the higher frequencies.
For normal measurements, the probes are
connected to a spectrum analyzer. These instru-
ments generally have an input impedance of 50
Ohms. This impedance is the normal termination
impedance for the probes. If an oscilloscope
or measurement receiver with a different input
impedance is used, an additional 50 Ohms feed-
through termination must be used. If the probe
is not loaded with a 50 Ohm impedance, it is not
calibrated.
The different probes are used for different tests
since their electric characteristics are quite
different. The E-eld probe is normally used at a
distance of 0.5 to 1.5meters from the RFI source.
The thereby observed frequencies are then further
localized near the source by use of the H-eld
probe. The high impedance (Hi-Z) probe makes
further localization possible by directly contacting
the source and to judge the effectiveness of sup-
pression measures.
Because of its electrical characteristics, the E-
eld probe is not intended to perform measure-
ments within an equipment or directly on parts
that are live. Electrical contact of the antenna
with live parts exceeding 0 VDC or + 10 dBm at
RF may cause damage to the built-in pre-amplier.
These limits also apply to the Hi-Z probe; however,
electrical contact to parts that are below 0VDC
or + 10dBm are permitted.
Safety notice
Basically, it is not permissible to per-
form measurements on parts that are
live above 30V. Since a signicant part
of the measurements are performed
on exposed parts, it is a prerequisi-
te 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.
The probes may not be used to perform accurate
quantitative measurements. It is not possible to
relate the probe measurements directly to nal
values of field strength in V/m necessary for
certication tests. The probe kit is intended as an
aid for developmental tests to obtain a qualitative
amplitude as a function of frequency. These values
are strongly inuenced by the limiting conditions
of the measurement which may change as a func-
tion of frequency.