Display - YOKOGAWA WT1800 User Manual

6.1 Input
Item
Influence of common-mode
voltage
Line filter
Frequency filter
A/D converter
Range switching
Auto range feature
Rated voltage to ground
* Do not touch the inside of the external current sensor input BNC connector.
6.2

Display

Item
Display
Resolution of the entire
*
screen
Display update rate
* Relative to the total number of pixels, 0.002% of the LCD screen may be defective.
6-2
Specifications
When 1000 Vrms is applied between the input terminal and case with the voltage input terminals
shorted, the current input terminals open, and the external current sensor input terminals shorted.
• 50/60 Hz: ±0.01% of range or less.
• Reference value for up to 100 kHz: ±{(maximum rated range)/(rated range) × 0.001 × f% of
range} or less
For external current sensor input, add maximum rated range/rated range × {0.0125 × log(f ×
1000) − 0.021}% of range to the value above.
0.01% or greater. The unit of f is kHz.
The maximum rated range in the equation is 1000 V, 50 A, 5 A, or 10 V.
Select from off, 100 Hz to 100 kHz (in steps of 100 Hz), 300 kHz, and 1 MHz.
Select from off, 100 Hz, and 1 kHz.
Converts voltage and current inputs simultaneously
Resolution: 16 bits
Conversion rate (sampling interval): approx. 500 ns. For the values when displaying harmonics,
see the sections on harmonic measurement.
The range can be set for each input element.
Range increase
• When Urms or Irms exceeds 110% of the measurement range.
• When the peak value of the input signal exceeds approximately 330% (approximately 660%
when the crest factor is set to 6) of the range.
Range decrease
The range is decreased when all the following conditions are met.
• The measured Urms or Irms value is less than or equal to 30% of the range.
• The measured Upk or Ipk value is less than or equal to 300% (approximately 600% when the
crest factor is set to 6) of the lower range.
• The measured Urms or Irms value is less than or equal to 105% of the lower range (the range
to decrease to).
Voltage input terminals: 1000 V
Current input terminals
with /EX1 to /EX6 option
without /EX1 to /EX6 option: 1000 V
External current sensor input connector: 600 V
Specifications
8.4-inch color TFT LCD
1024 × 768 dots (H × V)
Same as the data update rate.
However,
1) When only the numeric display is in use and the data update rate is 50 ms, 100 ms, or 200 ms,
the display update rate is a value in the range of 200 ms to 500 ms (the rate varies depending
on the number of displayed items).
2) When a display other than the numeric display (including the Custom display) is in use and the
data update rate is 50 ms, 100 ms, 200 ms, or 500 ms, the display update rate is 1 s.
3) If the measurement mode display is set to Normal Mode (Trg), measurement takes place from
when a trigger is detected over the data update interval.
The following amount of time is required for the WT1800 to compute the measured data,
process it for displaying, and so on, and become ready for the next trigger.
• When the data update interval is 50 ms to 500 ms: Approx. 1 s
• When the data update interval is 1 s to 5 s: Data update interval + 500 ms
In this case, storage, communication output, and D/A output operate in sync with the triggers.
If the measurement mode display is set to Normal Mode, storage, communication output, and
D/A output operate in sync with the data update interval.
*
: 1000 V (maximum allowable voltage that can be measured)
600 V (rating voltage of EN61010-2-030)
IM WT1801-03EN