CONDITION
PORTABLE
FIXED
ISOLATED
NON
EQUIPMENT EQUIPMENT
ISOLATED
Power off
300a
5.0ma
10a
100a
(grounded)
Power off
300a
5.0ma
50a
100a
(grounded lifted)
Power on
300a
5.0ma
10a
100a
(grounded)
ISO test for patient
Lead to lead
Lead to lead
20a
leads
Maximum ground
0.50 ohm
0.50 ohm
resistance
Figure 2-2. Sample of maximum acceptable leakage current measured with
normal polarity.
(1)
Set the mode switch to power cord resistance.
(2)
Set the test receptacle polarity to the center position (OFF).
(3)
Plug the UUT into the test receptacle on top of the Model 232M.
(4)
Connect the dual banana plug end of a Kelvin cable to the two red rear
panel jacks.
(5) Connect the alligator clip of the Kelvin cable to a grounded point on the
case of the UUT.
(6) The current source active lamp lights up to indicate that the current source
is connected to the test lead jacks. The display reads the ground resistance in mOhms
from the test receptacle ground pin of the safety analyzer to the case of the UUT. Refer to
figure 2-2 for an example of acceptable resistance measurements. Because the
standards change, always refer to the current NFPA 99 in your work situation.
d. Check the Case Leakage Current. Refer to figure 2-3. Perform the following
steps.
(1)
Set the mode switch to CASE LEAKAGE.
MD0356
2-4