20 I-210+ User Manual
Meter Accuracy Testing
Disk Analog Testing
The disk analog provides a manual means of checking the calibration of the meter.
There are some practical limits to this method of testing. For example, if the load
on the meter is very low, the test may take a long time. Conversely, if the load is
high, it may be difficult to accurately time the switching of the standard.
Refer to Real Time Watt Hour Disk Emulator on page 17 for detailed
understanding of the disk analog operation feature.
For this test you need a portable standard with a start/stop switch. Field testing
using the disk analog allows you to check the calibration of the meter without
having to install a phantom load.
1. Confirm the correct form of meter is used for a given socket.
2. Connect the portable standard to the meter.
3. Reset the standard.
4. Observe the disk analog. Each cycle of the disk analog represents Kh Watt
hours of accumulation. (The Kh value is printed on the meter nameplate.)
5. When the disk analog transitions from all segments on to all segments off,
start the standard.
6. Let the disk analog scroll a predetermined number of times (two, for
example).
7. Stop the standard when the disk analog transitions from all segments on to
all segments off for the desired number of times.
8. Calculate the accumulated watt-hours as shown in the following equation.
Accumulated Energy = (Kh) × (the number of complete disk analog cycles)
E.g. If: Kh equals 10 and 2 complete cycles were counted
Then: (10 Wh) x (2 complete scroll cycles) = 20 Wh.
9.
Compare the results of the calculation to the reading on the standard.
Meter Instantaneous Power Testing
When enabled, the I-210+ displays instantaneous power with the kW indicator in
the lower row of the LCD. The instantaneous power indication is useful for
making a rough estimate of meter performance by comparing the displayed power
to the expected load on the meter. The result is similar to the time-watts test
method and depends upon reasonably knowing the applied load and upon the
displayed precision of the result. Because the display is auto-ranging, at low loads
the displayed precision can differentiate a load variation of a few watts of power.
The instantaneous power value may be useful in resolving customer questions
about meter performance since no computation is necessary to obtain meaningful
data. The value is also useful to service personnel for providing immediate data on
the applied load.
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