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12-9
IM 760301-01E
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App
Index
Specifications
12.5 Functions
Measurement Function and Measurement Conditions
Item Specifications
Measurement method Digital multiplier method
Crest factor Select 3 or 6 (when rated value of the measurement range is input)
300 for the minimum effective input.
Measurement period Period used to determine and compute the measurement function.
•
The measurement period is set by the zero crossing of the reference signal (synchronization
source) when the data update interval is 50 ms, 100 ms, 5 s, 10 s, or 20 s (excluding watt hour
WP as well as ampere hour q during DC mode).
• Measured through exponential averaging on the sampled data within the data update interval
when the data update interval is 250 ms, 500 ms, 1 s, or 2 s.
• For harmonic measurement (/G6 or /G5 option), the measurement period is from the beginning
of the data update interval to 9000 points at the harmonic sampling frequency.
Wiring system Select the wiring system from the following:
1P2W: single-phase, two-wire, 1P3W: single-phase, three-wire, 3P4W: three-phase, four-wire,
and 3P3W (3V3A) three-voltage, three-current
However, the selectable wiring systems vary depending on the number of input elements that are
installed.
Measurement range See section 12.1.
Compensation function Efficiency compensation: Compensates for the instrumental loss during efficiency computation
Wiring compensation: Compensates for the instrumental loss due to wiring
Tow-Wattmeter Method Compensation
*
* Selectable on models with the delta computation option.
Scaling Set the current sensor transformation ratio, VT ratio, CT ratio, and power factor in the range of
0.0001 to 99999.9999 when inputting the external current sensor, VT, or CT output to the
instrument.
Input filter Specify a line filter or a frequency filter. See section 12.1.
Averaging • Measurement Functions of Normal Measurement
Select exponential average or moving average.
•
Exponential average
Select the attenuation constant from 2, 4, 8, 16, 32, and 64.
• Moving average
Select the average count from 8, 16, 32, 64, 128, and 256.
• Measurement Functions of Harmonic Measurement
•
Exponential average
Select the attenuation constant from 2, 4, 8, 16, 32, and 64.
Data update rate Select from 50 ms, 100 ms, 250 ms, 500 ms, 1 s, 2 s, 5 s, 10 s, and 20 s.
Display update rate Same as the data update rate.
Exceptions are listed below.
•
The display update interval of numeric display (4, 8, and 16 items) is 250 ms when the data
update rate is 50 ms or 100 ms.
• The display update interval of numeric display (ALL, Single List, and Dual List) is 500 ms when
the data update rate is 50 ms to 250 ms.
• The display update rate of the trend display, bar graph display, and vector display is 1 s when
the data update rate is 50 ms to 500 ms.
• The display update interval of the waveform display is approximately 1 s when the data update
rate is 50 ms to 1 s. However, it may be longer depending on the trigger setting.
Response time Data update rate × 2 at the maximum. Only when displaying numeric values.
Hold Holds the data display.
Single measurement Executes one measurement during the hold condition.
Zero-level Performs zero-level compensation.
compensation/Null