MRU-200-GPS OPERATING MANUAL Version 1.06
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tions, or using a longer 80 cm / 2.5 ft. probe. Check that the test leads are securely connected, the
insulation is not damaged, and the probe contacts are not corroded or loose. In most cases meas-
urements will be successful; however, be conscious of the sources of uncertainty the measurement
can be affected by.
- If the resistance of
H
and
S
probes or one of them exceeds 1k
Ω, an appropriate message is dis-
played: "
R
H
and R
S
electrodes resistance are higher than 1
kΩ! Measurement impossible!
".
Additional information displayed by the meter
Z
E
>199
Ω
Measurement range exceeded.
V
N
>40V!
and a con-
tinuous audio tone.
The voltage on the measurement points exceeds 40V,
the measurement is cancelled.
V
N
>24V!
The voltage on the measurement points exceeds 24V
but lower than 40V, the measurement is cancelled.
LIMIT!
The uncertainty of the electrode resistance > 30%. (Un-
certainties calculated on the basis of the measured val-
ues)
NOISE
!
The value of the interfering signal is too high,
the result may be distorted by additional uncertainty.
3.9 Current measurement
The current measurement function simply measures current with a current clamp or probe. It
may be used for example for measurement of leakage current in an installation. Sonel offers several
types of clamps and probes, with various diameters and current ranges (see Technical Data).
Turn the meter on.
Set the rotary
function selector switch at
I
.
Press
F1
to select type of clamp.
