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1550C/1555
Users Manual
12
Dielectric Absorption Ratio
As part of the insulation test, the Tester measures and stores dielectric
absorption ratio (DAR), when appropriate. A DAR test requires
1 minute to complete. Therefore, it is measured and stored as invalid
data for all insulation tests <1 minute. When an insulation test is
≥1 minute, the DAR test is included in the results. The results are
available for display during a test by pushing the
button or by
storing the test results and scanning the RESULTS fields. The field is
identified by:
The Tester also does the DAR test in accordance to the Chinese
standards:
Capacitance
As part of the insulation test, the Tester measures and stores
capacitance when appropriate. The results are available for display
during a test by pushing the
button or by storing the test results
and scanning the RESULTS fields. The field is identified by C=.
Insulation Test
XW Warning
To prevent possible electric shock, fire, or personal
injury:
•
Be aware that insulation resistance measurement
requires the application of potentially dangerous
voltages to the circuit. This may include exposed
bonded metalwork.
•
Remove all power from the circuit under test and
discharge circuit capacitance before you do a circuit
test with the Product.
•
Before proceeding, ensure that the installation is wired
correctly and no personnel are endangered by any
tests.
•
Connect the test leads to the Product inputs before you
make connection to the circuit under test.
PI/DAR Limits:
•
Cap. Max >1 μF and Res. Max >100 MΩ
•
Res. Min <200 kΩ
•
Current min <50 mA
•
If a limit is exceeded, the Tester shows UNSPEC. on the display.
To perform an insulation test:
1.
With the Tester turned on, set the available measurement options
to meet the test requirements. These include:
•
Test Voltage
– Set range: 250 V to 1000 V (50 V steps)
– Set range: 1000 V to 10 000 V (100 V steps)
Note
5000 V max for 1550C.
•
Ramp Test – Toggle on or off
•
Time Limit – No limit or from 1 to 99 minutes
2.
Connect the probes to the circuit under test.
DAR =
R
@
1 min
R
@
30 sec
DAR [CN]=
R
@ 1 min
R
@ 15 sec
1.888.610.7664 sales@GlobalTestSupply.com
Fluke-Direct
.com
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