ZS3 Service Manual Page 281 of 295
ELECTRICAL SAFETY INSPECTION
4- Protective Earth Resistance
Protective Earth Resistance is measured using the RED test lead attached to
the DUT Protective Earth terminal or Protective Earth Metal enclosure or
equipotential terminal. Select the test current by pressing SOFT KEY 3 to
toggle between 1AMP, 10AMP, and 25AMP. The front panel outlet power is
turned off for this test.
The following conditions apply: L1 and L2 Open.
1) First select the test current that will be used for performing the Protective Earth
Resistance test by pressing AMPERES (SOFT KEY 3).
2) Connect the test lead(s) between the RED input jack and the GREEN input jack.
3) Press CAL LEADS. The 601PRO will measure the lead resistance, and if less
than 0.150 Ohms, it will store the reading and subtract it from all earth resistance
readings taken at the calibrated current.
4) If the calibration fails, the previously stored readings will be used until a passing
calibration has occurred.
During Earth Resistance testing, the DUT must be plugged into the
601PRO front outlet. If the DUT fails Earth Resistance, discontinue tests and
label the device defective.
1) From the MAIN MENU, or with the outlet unpowered, plug the DUT into the
601PRO front panel outlet.
2) Attach the 601PRO RED input lead to the device’s Protective Earth terminal or
an exposed metal area.
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