Electrical Safety Inspection A-5
NOTE: “4-protective grounding impedance” testing item is applicable for M9 portable ultrasound
system with UMT-500Plus trolley (configured with power supply), and is not applicable for
unaccompanied M9 system or M9 system with UMT-500 trolley (without power supply).
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) Pres
s 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
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