Probe Configuration
The Probe configuration is controlled by the relays SH and SL shown in the preceding
image and are set by the “Probe” soft key. These two relays configure the current
measuring device into three possible positions. Repeatedly pressing the Probe soft
key allows the selection of the three different states. The three positions are
described in the table below.
MEASURING
DEVICE POSITION
Enclosure Leakage or
Patient Leakage
External Applied Part or
Surface to Surface
Leakage
Ground-to-Line indicates the MD is connected to measure the leakage current in the
line cord from the earth ground conductor back to the system neutral. This is referred
to as an EARTH LEAKAGE TEST.
Probe-HI to Line indicates the MD is connected between the PROBE HI terminal on
the instrument, which should be connected to the ENCLOSURE of the DUT, and the
system neutral. This is known as an ENCLOSURE LEAKAGE TEST.
Probe-HI to Probe-LO indicates the MD is connected between the PROBE HI and the
PROBE LO terminals on the instrument which allow the operator to connect the MD
between applied parts.
Measuring Device
The Measuring Device is a circuit that simulates the impedance of the human body.
The Measuring Device is specified differently for different agencies, applications and
specifications. Repeatedly pressing the “Measure Device” soft key will allow you to
select one of the many measuring devices listed in the table below. The table below
indicates the available measuring devices and the appropriate agency standard to
which it correlates.
UL544 Non patient equipment
UL544 Patient care equipment
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