Earth/Ground Tester
Procedure of Measurements
31
Safety Control Measurements
Before each measurement the instrument automatically checks the measuring
conditions and, while simultaneously displaying the kind of error, prevents
measurements from being started under the following conditions:
• excessive voltage on the sockets (> 24 V in RE and R~; > 3 V in
RF)
• wrong or incomplete connection
• Problems during the measuring sequence (display "E1 ... E5") see
display description in the section ‘Procedure of Measurements’.
• Battery voltage too low ( display LO-BAT )
Measurement of Interference - Voltages and Frequen-
cies
This measuring function detects possible interference voltages and their fre-
quencies. This function is automatically active in every switch position before
an earthing or resistance measurement. If the pre-set limit values are exceeded,
the interference voltage is indicated as too high and a measurement automati-
cally prevented .The frequency of an interference voltage is only measurable if
the level of this intereference voltage is higher than 1 V. See Figure 7.
Bring central rotary switch in desired position, read out measured value of in-
terference voltage, measured value of interference frequency is displayed with
"DISPLAY".
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