Features - YOKOGAWA WT1800 User Manual

6.5

Features

Measurement Features and Measurement Conditions
Item
Crest factor
Measurement period
Wiring system
Scaling
Averaging
Data update rate
Response time
Hold
Single
Zero-level compensation/
Null
6-10
Specifications
300 for the minimum effective input
3 or 6 for the measurement range's rated direct input
Period used to determine and compute measurement functions.
• Except for watt hours (Wp) and DC ampere hours (q), the measurement period is set using the
zero crossing points of the reference signal (synchronization source).
• When displaying harmonics:
The measurement period is the first 1024 or 8192 points from the beginning of the data update
interval at the harmonic sampling frequency.
(1) 1P2W, single-phase, two-wire; (2) 1P3W, single-phase, three-wire; (3) 3P3W, three-phase,
three-wire; (4) 3P4W, three-phase, four-wire; and (5) 3P3W(3V3A), three-phase, three wire system
that uses a three-voltage, three-current method
The selectable wiring systems vary depending on the number of input elements that are installed.
Set the current sensor conversion ratio, VT ratio, CT ratio, and power coefficient in the range
of 0.0001 to 99999.9999 when applying the external current sensor, VT, or CT output to the
instrument.
• Using one of the following methods, perform averaging on the normal measurement items: voltage
U, current I, power P, apparent power S, or reactive power Q. Power factor λ and phase difference
angle Φ are determined from the averaged P and S values.
• Select either exponential averages or moving averages.
• Exponential average
Select the attenuation constant from a value between 2 and 64.
• Moving average
Select the average count from a value between 8 and 64.
• Harmonic measurement
Only exponential averaging is valid.
Select from 50 ms, 100 ms, 200 ms, 500 ms, 1 s, 2 s, 5 s, 10 s, and 20 s.
Data update rate × 2 or less (only during numeric display)
Holds the data display
Executes a single measurement while measurements are held
Performs zero-level compensation. Null compensation range: ±10% of range
You can configure the null setting individually for each of the following input signals:
• Each input element's voltage and current
• Rotating speed and torque
• AUX1 and AUX2
IM WT1801-03EN