5.4 Functional Specifications
156
Auto-range (AUTO)
Averaging (AVG)
Scaling (VT, CT)
5.4 Functional Specifications
Functions Automatically changes the voltage and current range for each wiring mode according to
the input.
Operation Pressing the SHIFT key and then the AUTO key turns on the auto-range function (caus-
ing the AUTO lamp to light up). Pressing the SHIFT key and then the AUTO key again
turns the auto-range function off, as does pressing any range key (causing the AUTO
lamp to turn off).
Range up: The range is increased when input exceeds 130% of the range or when the
peak is exceeded.
Range down: The range is decreased when input falls below 15% of the range. Howev-
er, the range is not decreased when the peak is exceeded at the lower range.
Functions Averages the voltage, current, active power, apparent power, and reactive power. The
power factor and phase angle are calculated from averaged data. Measured values oth-
er than peak values, efficiency, frequency, integrated values, T.AV, crest factor, ripple
rate, total harmonic distortion, and harmonics are averaged.
Method Simple averaging
Number of averaging
iterations and display update
interval
Display The AVG lamp will light up when the number of averaging iterations is set to a value
other than 1 (off). From the start of averaging until the first average value is displayed,
the AVG lamp will flash, and all measured values will be shown as [- - - - -] (invalid data).
Over-range warning When the data being averaged includes an [o.r] value, the corresponding unit will flash.
Operation Start of averaging
1. Averaging starts after zero-adjustment operation is complete (when turning on the
instrument or after zero-adjustment operation).
2. Averaging restarts when the DATA RESET key is pressed (including via external
control).
3. Averaging restarts when settings related to measured values are changed, includ-
ing the number of averaging iterations, wiring mode, and range.
Number of averaging
iterations
1(OFF) 2 5 10 25 50 100
Display update interval 200 ms 400 ms 1 s 2 s 5 s 10 s 20 s
Functions Applies user-defined VT and CT ratio settings to measured values. These settings can
be configured separately for each wiring mode.
VT ratio setting range OFF (1.0)
0.1 to 0.9, 1.0 to 9.9, 10.0 to 99.9, 100.0 to 999.9, 1,000. (setting: 0)
CT ratio setting range OFF (1.0)
0.001 to 0.009, 0.010 to 0.099, 0.100 to 0.999, 1.000 to 9.999, 10.00 to 99.99, 100.0 to
999.9, 1,000. (setting: 0)
Display The VT lamp will turn on when the VT ratio is set to any value other than 1 (off).
The CT lamp will turn on when the CT ratio is set to any value other than 1 (off).
Error warnings The display will show S.Err (scaling error) when the VT ratio or CT ratio setting causes
the full-scale value for active power, apparent power, or reactive power to exceed
99,999 M.
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