Probewell MT-1/WT3, User Manual, Page: 16 / 86

MT-1/WT3 User Guide
Page • 15
Meter Testing
Tests performed with a pickup accessory (Optical or Metercam)
Five different tests can be done with optical pickups: Quick , Full , Custom, Four-
Quadrant (WH) and Four-Quadrant (VARH) Test.
Quick Test , Full Test, Four-Quadrant (WH) and Four-Quadrant (VARH) Test are made
up of a predetermined sequence of consecutive steps and tests, all of which are done
in one operation. The sequence is programmable and can be modified through the
Settings tab. By default, the sequence includes one test point with each of the loads:
HL, PF and LL.
In Quick Test , the three phases (ABC) are tested simultaneously in one step.
In Full Test , a Quick Test is performed followed by each phase separately (A, B, and
C). In the Settings tab, there is an option to remove the PF and/or LL for each single
element test.
In Four-Quadrant (WH) Test , the equivalent of a Quick Test is done at various phase
lags between Voltage and Current. This is meant to test the operation of the meter
in all four quadrants of the power vector diagram. For this test, the device expects
the meter to pulse on WH units.
In Four-Quadrant (VARH)Test , the equivalent of a Quick Test is done at various phase
lags between Voltage and Current. This is meant to test the operation of the meter
in all four quadrants of the power vector diagram. For this test, the device expects
the meter to pulse on VARH units.
Please note that with single-phase meters, only the Quick Test, Four-Quadrant (WH)
and Four-Quadrant (VARH) test will be activated as there is no Full Test for single-
phase meters.
Custom Test consists in choosing one of the three loads to apply to the meter: HL, PF
or LL. The disk revolutions or pulses are counted automatically by the pickup. No
critical timing is required to start a test. The test ends automatically.
When testing a three-phase meter, you can also choose to apply the load on all
phases (ABC) at the same time or on each phase individually (A, B or C). The phase
selection is done by selecting the appropriate phase (A, B, C, or A+B+C) in the
Select
Active Phase drop down window.
Tests performed without a pickup accessory (Optical or Metercam)
Manual Test is used when the operator counts the disk revolutions manually. A
magnet is used to start and end the test manually by applying it to the side of the
socket (see figure 2.2). The operator can set his own parameters for conducting a
test, such as the number of revolutions and the load to be applied. The load can be
switched dynamically during the test.