TEST PARAMETER SETUP PROCEDURES
27
When the LEDs represent the desired line configuration the test is ready to start.
No other keystrokes are necessary. The line configuration settings are automatically
saved in memory.
7.5 Probe Configuration
The Probe configuration is controlled by the relays SH and SL in Figure 1 of the
previous section 2.3. These two relays configure the current measuring device into
three possible positions. The three positions are described in the table below.
Measuring
Device Position
SH SL Display
Indicatio
n
Agency Test Application
Ground to Line A A G-L Earth Leakage
Probe HI to Line B A P
H
-L Enclosure Leakage or
Patient Leakage
Probe-HI to
Probe-LO
B B P
H
-P
L
External Applied Part or
Surface to Surface Leakage
G-L indicates the MD is connected to measure the leakage current in the earth ground
conductor in the line cord back to the system neutral, an EARTH LEAKAGE TEST.
P
H
-L indicates the MD is connected between the PROBE HI (P
H
) 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. P
H
-P
L
indicates
the MD is connected between the PROBE HI (P
H
) and the PROBE LO (P
L
) terminals
on the instrument which allow the operator to connect the MD between applied parts.
The LCD display will indicate the Probe configuration in the center of the second
line. The ground to line configuration will be indicated as follows:
1 . 0 s D 110.2V
M1-1
_
G-L
2500µ A
To change the Probe configuration press the PROBE key. The Probe configuration
will change each time the key is pressed, in sequential order. When the display
indicates the desired Probe configuration, the test is ready to start. No other key
strokes are necessary to finish the configuration. The Probe configuration settings
are automatically saved into memory.
7.6 Measuring Device
The Measuring Device is the human body impedance circuit that is specified in the
agency specification for leakage current tests. The following table indicates the
measuring device letter designation used by 7611 and the appropriate agency
standard that it correlates to.
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