Mindray DC-25, Service Manual

Page: 195 / 213

ELECTRICAL SAFETY INSPECTION A-5
ELECTRICAL SAFETY INSPECTION
4- Protective Earth Resistance
VOERVIEW
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.
TEST PROCEDURE

Prepare
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.

Warning
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.

Perform the Test
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