YOKOGAWA wt3000 User Manual

12-5
IM 760301-01E
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App
Index
Specifications
12.4 Accuracy
Voltage and Current Accuracy
Item Specifications
Accuracy Conditions
(accuracy at 6 months) Temperature: 23±5°C. Humidity: 30 to 75% RH. Input waveform: Sine wave. Common-mode
voltage: 0 V. Line filter: OFF. λ (power factor): 1. Crest factor: 3. After warm-up time has passed.
Wired condition after zero-level compensation or measurement range change. f is the frequency.
Frequency Accuracy
±(reading error + measurement range error)
DC
• Voltage input 0.05% of reading + 0.05% of range
• Current sensor input
• Current of a 30-A input element
from direct input
• Current of a 2-A input element 0.05% of reading + 0.05% of range + 2 µ A
from direct input
0.1 Hz ≤ f < 30 Hz 0.1% of reading + 0.2% of range
30 Hz ≤ f < 45 Hz 0.03% of reading + 0.05% of range
45 Hz ≤ f ≤ 66 Hz
• Voltage input 0.01% of reading + 0.03% of range
• Current sensor input
• Current of a 30-A input element from
direct input
• Current of a 2-A input element from
direct input at the 500 mA to 2 A range
• Current of a 2-A input element from 0.03% of reading + 0.05% of range
direct input at the 5 mA to 200 mA range
66 Hz < f ≤ 1 kHz 0.03% of reading + 0.05% of range
1 kHz < f ≤ 10 kHz 0.1% of reading + 0.05% of range
10 kHz < f ≤ 50 kHz 0.3% of reading + 0.1% of range
50 kHz < f ≤ 100 kHz 0.012 × f% of reading + 0.2% of range
100 kHz < f ≤ 500 kHz 0.009 × f% of reading + 0.5% of range
500 kHz < f ≤ 1 MHz (0.022 × f – 7)% of reading + 1% of range
* The unit of f in the read error equation is kHz.
• Add 3% of range (reference value) to the above accuracy figure for the accuracy of the
waveform display data, Upk, and Ipk. However, for external sensor input, add 3% of range + 5
mV (reference value). The effective input range is within ±300% of the range (within ±600% of
the range if the crest factor is set to 6).
• For temperature changes after zero level compensation or range change, add 50 ppm of
range/°C to the DC accuracy of the voltage.
• For temperature changes after zero level compensation or range change, add the following
values to the DC accuracy of the direct current input.
• 2-A input element: 3 µA/°C
• 30-A input element: 0.2 mA/°C
• For temperature changes after zero-level compensation or range change on the external current
sensor input, add 0.02 mV/°C to the DC accuracy of the external current sensor input.
• For self-generated heat caused by current input on an AC input signal, add the following values
to the current accuracy.
• 2-A input element: 0.004 × I
2
% of reading
• 30-A input element: 0.00002 × I
2
% of reading
• For self-generated heat caused by current input on a DC input signal, add the following values to
the current accuracy.
• 2-A input element: 0.004 × I
2
% of reading + 6 × I
2
µA
• 30-A input element: 0.00002 × I
2
% of reading + 3 × I
2
µA
I is the current reading (A). The influence from self-generated heat continues until the
temperature of the shunt resistor inside the WT3000 lowers even if the current input changes to
a small value.
• When the data update interval is 50 ms, add 0.1% of reading to all accuracy figures.
• When the data update interval is 100 ms, add 0.05% of reading to all accuracy figures.

YOKOGAWA wt3000 Specifications

General

Brand	YOKOGAWA
Model	wt3000
Category	Measuring Instruments
Language	English