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P403-3222 Rev. K 4/18
*1 µΩ (1 micro ohm) = 0.000001 ohm
** mΩ (milli ohm) = 0.001ohm
FUNCTIONAL DESCRIPTION
The PROTECTIVE GROUNDING SET TESTER uses a 5 volt direct current (dc) source to measure resis-
tances in grounding sets. Output current through the grounding set is limited to a maximum of 10 amps by
an internal current limiting resistor. The tester switches the 5 volt power supply on, makes a measurement,
and switches the power off again for a minimum of 500 milliseconds.
The tester uses a 4 wire resistance measurement approach to obtain accurate resistance measurements. The
measurement system is auto ranging to give +/-1% accurate resistance measure from 1 µΩ* to 6.5 Ω.
FEATURE DESCRIPTION
The following list of features are referenced with number 1 - 19, and the location of the feature is shown on
Figure 1.
1.
Test Probes
Probes are used in troubleshooting mode to locate high resistance area of the ground set.
2.
Instructional Video P403-3223
Shows how to use the Protective Ground Set Tester. The videotape is not a substitute for this Instruc-
tion Manual. Thoroughly read and understand these instructions before using the Tester.
3.
Fixed Input Connections
When the ‘INPUT SELECT’ switch is in the fixed position. The resistance measurement shown will
be the value of resistance from one fixed connection through the ground set to the other fixed con-
nection.
4.
Power Entry Module
Main power switch illuminates when power to the tester is on, and includes the fuse holder
compartment.
5.
Preset Resistance Threshold
This number, shown on the display, is the pass/fail resistance threshold used to light the pass or fail
LEDs. There is a different resistance threshold for each cable size. The ‘<’ symbol displayed means
less than. For example, when ‘<3.333’ (mΩ**) is displayed, it means that a ground set resistance
which is less than 3.333 mΩ** will light the pass LED.
6.
Measured Ground Set Resistance
When the ‘INPUT SELECT SWITCH’ is in the ‘FIXED’ position. The value shown will be the re-
sistance measured from one fixed connection (3) through the ground set to the other fixed connection
(3). When the ‘INPUT SELECT SWITCH’ is in the ‘PROBE’ position. The value shown will be the
resistance measured between the probe contact points.
7.
Selected Cable Size
Indicates size of cable under test. This must be changed for each new size cable used.