Fluke Biomedical ESA620 - Manual (Page 33)

Electrical Safety Analyzer
Performing Electrical Safety Tests
19
To perform a protective-earth resistance test:
1. Ensure the power cord from the DUT is plugged into
the Analyzer’s test receptacle.
2. Press  to reveal the resistance function menu.
3. Connect one end of a test lead to the 2-WIRE V/
Ω
/A
jack as shown in Figure 7. A low resistance reading
is required to confirm a good ground connection
through the power cord. Refer to the appropriate
electrical safety standard for the specific limit value to
be followed.
For the 4-Wire resistance measurement, skip steps 4
and 5.
4. Connect the other end of the test lead to the nulling
jack in the middle of the top panel of the Analyzer.
Note
Use the supplied null post adapter when you null
the test lead with the alligator clip.
5. Press the softkey labeled Zero Leads. The Analyzer
zeroes out the measurement to cancel the test lead
resistance.
6. Connect the test lead coming from the 2-WIRE V/
Ω
/A
jack to the DUT enclosure or protective earth
connection. For a 4 Wire measurement, make
another test lead connection from the RED 4-Wire
Source jack to the same DUT or protective earth
connection the other lead is on as shown in Figure 8.
The optional Kelvin Lead Set is designed specifically
for 4-Wire resistance measurements. See the
Accessories section for ordering information.
The procedure changes at this point depending on which
of the two test currents are selected for this test.
For testing with a 200 mA test current:
1. If not already selected, press the softkey labeled
Low.
2. The measured resistance is displayed as shown in
Figure 10 after the DUT connection(s) is/are made.