Meter Testing - Probewell MT-1/WT3 User Manual

MT-1/WT3 User Guide

Meter Testing

Tests performed with a pickup accessory (Optical or Metercam)
Five different tests can be performed with optical pickups: Quick, Full, Custom, Four-
Quadrant (Wh) and Four-Quadrant (VARh).
Quick Test, Full Test, Four-Quadrant (Wh) Test and Four-Quadrant (VARh) Test are
made up of a predetermined sequence of consecutive steps and tests, all of which
are performed in a single operation. The sequence is programmable and can be
modified through the "Settings" tab. By default, the sequence includes one test point
for 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 (A, B, and C) tested
separently. 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 conducted at various
phase lags between voltage and current. This is meant to test the meter's operation
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)
Test and Four-Quadrant (VARh) Test will be activated as there is no Full Test for
single-phase meters.
Custom Test consists of choosing one of the three loads to apply to the meter: HL,
PF or LL. The pickup automatically counts the disk revolutions or pulses. 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). Select 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 when the operator counts the disk revolutions manually. The test is
started and stopped manually by applying a magnet to the side of the socket (see
Figure 2.2). Operators can set their 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.
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