Frequency Measurement; Communication (Optional); Computing Functions - YOKOGAWA WT200 User Manual

16.3 Frequency Measurement

Item
Input
Operating principle
Frequency ranges
Accuracy

16.4 Communication (optional)

Item
GP-IB
RS-232-C

16.5 Computing Functions

Effective Power
1-phase 2-wire
Depends on
Computating range the selected
V and A ranges
Display resolution
(when the number of
displayed digits is 5)
Computing accuracy
(for the value operated
from the measured
value)
IM 253421-01E
Specification
V, A
Reciprocal counting method
10 Hz to 50 kHz
(100 Hz, 1 kHz, 10 kHz, 100 kHz, Auto range)
±(0.1% of rdg + 1 digit)
Minimum input is more than 30% of rated range.
When an input frequency is less than 200Hz, FILTER must be ON to obtain the specification
accuracy.
Minimum input frequency is more than 20% of frequency measurement range.
Specification
Electrical specifications:
Mechanical specifications:
Interface function:
Transmission mode: Start stop synchronization
Baud rate: 75, 150, 300, 600, 1200, 2400, 4800, 9600 bps
Apparent Power
(W) (VA)
W
VA=V×A
Depends on
the selected
V and A ranges
99999 99999
±0.005% of
–
VA range
Note
• The apparent power (VA), reactive power (var), power factor (PF), and phase angle (deg)
measurements in this instrument are computed digitally from the voltage, current and
effective power. If the input is non-sinusoidal, the measured values may differ from those
obtained with instruments employing different measurement principles.
• When the current or voltage is less than 0.5% of the range, the VA and var will be
displayed as 0, and PF/deg will be displayed as an error.
• The Lead and Lag are displayed for V and A input at 50% or more. The detected lead/lag
accuracy is ±5 degrees over the frequency range of 20 Hz to 2 kHz.
IEEE St'd 488.2-1987
IEEE St'd 488.2-1987
SH1, AH1, T5, L4, SR1, RL1, PP0, DC1,DT1, C0
Reactive Power Power Factor
(var)
2 2
(VA) –W
Same as apparent
–1 to 0 to 1
power (var ≤ 0)
±1.0000
99999
±0.005% of
±0.0005
var range
Phase Angle
(PF) (deg)
W W
–1
cos ( )
VA VA
–180 to 0 to 180
±180.0
Resolution
(power factor
±0.0005)
16-5
16