YOKOGAWA WT500, User Manual

Page: 302 / 360

14-1
IM 760201-01E
Specifications
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14
App
Index
14.1 Input
Item Specifications
Input terminal type Voltage
Plug-in terminal (safety terminal)
Current
• Direct input: Large binding post
• Current sensor input: Isolated BNC connector
Input format Voltage
Floating input through resistive voltage divider
Current
Floating input through shunt
Measurement range
(rated value)
Voltage
• When the crest factor is set to 3: 15 V, 30 V, 60 V, 100 V, 150 V, 300 V, 600 V, and 1000 V
• When the crest factor is set to 6: 7.5 V, 15 V, 30 V, 50 V, 75 V, 150 V, 300 V, and 500 V
Current
• Direct input
• When the crest factor is set to 3: 500 mA, 1 A, 2 A, 5 A, 10 A, 20 A, and 40 A
• When the crest factor is set to 6: 250 mA, 500 mA, 1 A, 2.5 A, 5 A, 10 A, 20 A
• External sensor input
• When the crest factor is set to 3: 50 mV, 100 mV, 200 mV, 500 mV, 1 V, 2 V, 5 V, and 10 V
• When the crest factor is set to 6: 25 mV, 50 mV, 100 mV, 250 mV, 500 mV, 1 V, 2.5 V, and
5 V
Input impedance Voltage
Input resistance: Approx. 2 M
Ω
; input capacitance: Approx. 13 pF
Current
• Direct input: Approx. 5 m Ω + approx. 0.1 µ H
• External sensor input: Approx. 100 K Ω
Instantaneous maximum
allowable input
(within 20 ms)
Voltage
Peak value of 2.8 kV or rms value of 2 kV, whichever is less.
Current
• Direct input: Peak value of 450 A or rms value of 300 A, whichever is less.
• External sensor input: Peak value less than or equal to 10 times the measurement range.
Instantaneous maximum
allowable input
(within 1 s)
Voltage
Peak value of 2 kV or rms value of 1.5 kV, whichever is less.
Current
• Direct input: Peak value of 150 A or rms value of 45 A, whichever is less.
• External sensor input: Peak value less than or equal to 10 times the measurement range.
Continuous maximum
allowable input
Voltage
Peak value of 1.5 kV or rms value of 1 kV, whichever is less.
Current
• Direct input: Peak value of 100 A or rms value of 45 A, whichever is less.
• External sensor input: Peak value less than or equal to 5 times the measurement range.
Continuous maximum
allowable input
(50/60 Hz)
1000 Vrms
Influence of common-mode
voltage
When 1000 Vrms is applied with the voltage input terminals shorted and the current input terminals
open.
• 50/60 Hz: ±0.01% of range or less.
• Reference value for up to 100 kHz: ±{(Rated maximum range)/(rated range) × 0.001 × f% of
range} or less
However, 0.01% or greater. The unit of f is kHz. The external sensor input range is the value
of the above equation × 20. The maximum rated range in the equation is 1000 V, 45 A, or 10 V.
Line filter The choices are OFF, 500 Hz, and 5.5 kHz.
Frequency filter The choices are OFF and ON.
A/D converter Converts voltage and current inputs simultaneously. Resolution: 16 bits. Conversion rate (sampling
interval): Approx. 10 µ s. For the values when displaying harmonics, see the sections on harmonic
measurement.
Chapter 14 Specifications