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7.3 Accuracy
Input range
Measurement frequency
range
When the line filter is turned
ON
Temperature coefficient
Accuracy when the crest
factor is set to 6 or 6A
7-6
• Influence of self-generated heat caused by voltage input
2
Add 0.0000001 ×U
% of reading to the AC voltage accuracies.
2
Add 0.0000001 ×U
% of reading + 0.0000001 ×U
the voltage reading (V).
Influence of self-generated heat caused by voltage input lasts until falling the temperature of the
input resistor even if voltage input decreases.
• Influence of self-generated heat caused by current input
WT310E:
2
Add 0.00013 × I
% of reading to the AC current accuracies.
2
Add 0.00013 × I
% of reading + 0.004 × I
2
0.00013 × I
% of reading + 0.00004 × I
mA ranges) to the DC current accuracies.
I is the current reading (A).
WT310EH:
2
Add 0.00006× I
% of reading to the AC current accuracies.
2
Add 0.00006 × I
% of reading + 0.001 × I
I is the current reading (A).
WT332E/WT333E:
2
Add 0.00013 × I
% of reading to the AC current accuracies.
2
Add 0.00013 × I
% of reading + 0.002 × I
I is the current reading (A).
Influence of self-generated heat caused by current input lasts until falling the temperature of the
shunt resistor even if current input decreases.
• Guaranteed accuracy ranges for frequency, voltage, and current (direct input)
All accuracy figures for 0.1 to 10 Hz are reference values.
The current accuracy figures for DC, 10 Hz to 45 Hz, and 400 Hz to 30 kHz when the
current exceeds 20 A are reference values.
WT310E only
The maximum current input is 6 A when the frequency is over 30 kHz up to 100 kHz.
1 to 130% with respect to the rated range of voltage or current. (It displays up to 140%.)
(Add the reading error × 0.5 to above accuracies for the range of 110% to 130% of the rated range.)
Crest factor 6A:
2 to 260% with respect to the rated range of voltage or current. (It displays up to 280%)
Crest factor 6A:
Except the range up condition of the automatic range and an effective input range, the other
operation is equal to crest factor 6.
WT310EH: 40 A Range Only 1 to 100% (display is 110%)
The synchronization source level must meet the frequency measurement input signal level.
Data update interval
0.1 s
0.25 s
0.5 s
1 s
2 s
5 s
10 s
20 s
Auto*
* Limit of the measurement lower limit frequency by the Timeout setting
Timeout : lower limit frequency
1 s
2.0 Hz
5 s
0.5 Hz
10 s
0.2 Hz
20 s
0.1 Hz
Only for direct current input of WT310EH, the maximum measurement range is 20kHz.
45 to 66 Hz: Add 0.2% of reading.
Less than 45 Hz: Add 0.5% of reading.
Add ±0.03% of reading/°C within the range of 5 to 18°C or 28 to 40°C.
Accuracy obtained by doubling the measurement range error for the accuracy when the crest factor
is set to 3.
2
% of range to the DC current accuracies. U is
2
mA (0.5 A, 1 A, 2 A, 5 A, 10 A, and 20 A ranges) or
2
mA (5 mA, 10 mA, 20 mA, 50 mA, 100 mA, and 200
2
mA to the DC current accuracies.
2
mA to the DC current accuracies.
Measurement Frequency Range
DC, 20 Hz ≤ f ≤ 100 kHz
DC, 10 Hz ≤ f ≤ 100 kHz
DC, 5 Hz ≤ f ≤ 100 kHz
DC, 2.0 Hz ≤ f ≤ 100 kHz
DC, 1.0 Hz ≤ f ≤ 100 kHz
DC, 0.5 Hz ≤ f ≤ 100 kHz
DC, 0.2 Hz ≤ f ≤ 100 kHz
DC, 0.1 Hz ≤ f ≤ 100 kHz
DC, 0.1 Hz ≤ f ≤ 100 kHz
IM WT310E-02EN
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