10.2 Basic Specifications
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Chapter 10 Specifications
Guaranteed accuracy period 6 months (and 1.25 times specified accuracy for one year)
Conditions of guaranteed
accuracy
Temperature and humidity for guaranteed accuracy: 23°C±3°C, 80% RH or less
Warm-up time: 30 minutes or more
Input: Sine wave input, power factor of one, or DC input, zero ground voltage, within effective measure-
ment range after zero-adjustment and within the specified range in which the fundamental wave satisfies
the synchronization source conditions.
Temperature coefficient ±0.01% f.s./°C (for DC, add ±0.01% f.s./°C)
Effect of common mode
voltage
±0.01% f.s. or less (with 1000 V (50 Hz/60 Hz) applied between voltage measurement jacks and chassis)
Magnetic field interference ±1% f.s. or less (in 400 A/m magnetic field, DC and 50 Hz/60 Hz)
Power factor influence Other than = ±90
±(1-cos (+Phase difference accuracy)/cos()) ×100% rdg.
When = ±90
±cos (+Phase difference accuracy) ×100% f.s.
Effect of conducted
radio-frequency
electromagnetic field
@3 V, current and active power not more than ±6% f.s., where f.s. current is the rated primary-side cur-
rent of the current sensor
f.s. active power equals the voltage range × the rated primary-side current of the current sensor
Effect of radiated
radio-frequency
electromagnetic field
@10 V/m, current and active power not more than ±6% f.s., where f.s. current is the rated primary-side
current of the current sensor, and f.s. active power equals the voltage range × the rated primary-side
current of the current sensor
Effective measuring range Voltage, Current, Power: 1% to 110% of the range
Total display area Voltage, Current, Power:
from zero-suppression range setting to 120%
Zero-suppression ranges Selectable OFF, 0.1 or 0.5% f.s.
When OFF, non-zero values may be displayed even with no measurement input
Zero adjustment Voltage: Zero-adjustment compensation of internal offset at or below ±10% f.s.
Current: Zero-adjustment compensation of input offset at or below ±10% f.s. ±4 mV
Waveform peak measurement
range
Within ±300% of each voltage and current range
Waveform peak measurement
accuracy
Within ±2% f.s. of voltage and current display accuracy
1. Power Measurement Input Specifications
2. Frequency Measurement Specifications
Measurement channels Four (f1 to f4)
Measurement source Select U/I for each measurement channel
Measurement method Reciprocal method + zero-crossing sample value correction
Measuring range Synchronous range from 0.5 Hz to 5 kHz (with “0.0000 Hz” or "----- Hz" unmeasurable time)
Selectable lower limit measurement frequency (0.5 Hz/1 Hz/2 Hz/5 Hz/10 Hz/20 Hz)
Data update interval 50 ms (measurement-frequency-dependent at 45 Hz and below)
Accuracy ±0.01 Hz (during voltage frequency measurement, with sine wave input of at least 30% of the voltage
measurement range and while measuring within the range of 45 Hz to 66 Hz)
Under other conditions, ±0.05% rdg. ±1 dgt. (with sine wave of at least 30% of the measurement
source’s measurement range)
Numerical display format 0.5000 Hz to 9.9999 Hz, 9.900 Hz to 99.999 Hz, 99.00 Hz to 999.99 Hz,
0.9900 kHz to 5.0000 kHz
3. Integration Measurement Specifications
Measurement mode Selectable RMS or DC for each wiring mode (DC is selectable only for 1P2W wiring and AC/DC sen-
sors)
Measurement items Current integration (Ih+, Ih-, and Ih), active power integration (WP+, WP-, and WP)
Ih+ and Ih- only for DC mode measurements, and lh only for RMS mode measurements
Measurement method Digital calculation from each current and active power phase (when averaging, calculates with pre-
vious average value)
In DC mode: calculates current value at every sample, and integrates instantaneous power indepen-
dent of polarity
In RMS mode: Integrates current effective values between measurement intervals, and polarity-in-
dependent active power value
Measurement interval 50 ms data update interval
Display resolution 999999 (6 digits + decimal) , starting from resolution at which 1% of each range constitutes f.s.
Measuring range 0 to ±9999.99 TAh/TWh
(however, with integration time of no greater than 9999 hours and 59 minutes)
Integration stops when either maximum integration value or time is exceeded.
Integration time accuracy ±50ppm±1dgt. (0°C to 40°C)
Integration accuracy ± (current and active power accuracy) ± integration time accuracy
Backup function Integration automatically resumes after power outages.
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