YOKOGAWA WT200, User Manual

Page: 231 / 242

16-2
IM 253421-01E
Current
Item Specification
Input circuit type Floating input
Shunt input
Rated inputs (range rms) Direct input: 20 A, 10 A, 5 A, 2 A, 1 A, 0.5 A, 200 mA, 100 mA, 50 mA, 20 mA, 10 mA, 5 mA
External sensor input (optional): (10 V, 5 V, 2.5 V), or (200 mV, 100 mV, 50 mV)
Input impedance Direct input: Approx. 6 m
Ω +
approx. 0.1
µ
H in the 20 A to 0.5 A range. Approx. 500 m
Ω
in the 200
mA to 5 mA range.
External sensor input: 2.5/5/10 V - approx. 100 k
Ω
; 50/100/200 mV - approx. 20 k
Ω
Instantaneous maximum 20 A to 0.5 A range: Peak current of 450 A or RMS value of 300 A, whichever is less.
allowable input for 20 ms, 200 mA to 5 mA range: Peak current of 150 A or RMS value of 100 A, whichever is less.
1 cycle External sensor input: Peak value is 10 times the range or less.
Instantaneous maximum 20 A to 0.5 A range: Peak current of 150 A or RMS value of 40 A, whichever is less.
allowable input for 1 s 200 mA to 5 mA range: Peak current of 30 A or RMS value of 20 A, whichever is less.
External sensor input: Peak value is 10 times the range or less.
Continuous maximum 20 A to 0.5 A range: Peak current of 100 A or RMS value of 25 A, whichever is less.
allowable input 200 mA to 5 mA range: Peak current of 30 A or RMS value of 20 A, whichever is less.
External sensor input: Peak value is 5 times the range or less.
Continuous maximum 600 Vrms (when the protective cover for the output connector is used) CAT II,
common mode voltage 400 Vrms (when the protective cover for the output connector is removed) CAT II
(at 50/60 Hz)
Common mode rejection 50/60 Hz, better than -80 dB (
±
0.01% of range maximum)
ratio at 600 Vrms between Current input terminals : open
input terminals and case
Reference value: 50 kHz max.
×
0.001
×
f% of rng
Maximum range rating
Range rating
Maximum range rating
Range rating
±
±
×
0.0002
×
f% of rng
(200 mA to 5 mA range)
(other than the 200 mA to 5 mA range)
; 0.01% or more; the unit f: kHz
Input terminals Direct input: Large binding posts, External sensor input: Safety terminals
A/D conversion Simultaneous sampling of voltage and current inputs; Resolution: 12 bits; Maximum conversion rate:
approx. 26
µ
s (approx. 38 kHz)
Range switching Range can be selected manually, automatically or by communication control.
Automatic range switching Range up: When the measured value exceeds 110% of the rated range or the peak value
exceeds approximately 300% of the rated range
Range down: When the measured value becomes less than 30% of the rated range and the peak
value is less than approximately 300% of the subordinate range
Measurement mode The following modes can be set manually or by communication control:
switching RMS: True RMS measurement for both voltage and current; V MEAN: Rectified Mean Calibrated to
an RMS sine wave measurement for voltage, and true RMS measurement for current; DC: Mean
value measurement for voltage and current
16.1 Input