YOKOGAWA WT500 User Manual page 104

4.4 Setting the Measurement Range for Direct Input
Explanation
4-8
Display Positions of the Element Being Set and the Specified Range
When a voltage or current range selection key (VOLTAGE or CURRENT
pressed, the following appears at the right of the screen.
Voltage range
Element
Voltage
Current
Selecting Which Element to Set
Only the indicators of elements that are installed will light. When independent element
configuration is off, the selected elements will switch by wiring unit, according to the
wiring system.
Setting the Voltage and Current Ranges
There are two types of ranges, fixed and auto.
• Fixed Range
The range is set in reference to the rms value of the input signal.
• Voltage range
• When the crest factor is set to 3
You can select 15 V, 30 V, 60 V, 100 V, 150 V, 300 V, 600 V, or 1000 V.
• When the crest factor is set to 6
You can select 7.5 V, 15 V, 30 V, 50 V, 75 V, 150 V, 300 V, or 500 V.
• Current range
• When the crest factor is set to 3
You can select 500 mA, 1 A, 2 A, 5 A, 10 A, 20 A, or 40 A.
• When the crest factor is set to 6
You can select 250 mA, 500 mA, 1 A, 2.5 A, 5 A, 10 A, or 20 A.
Note
• The range is set in reference to the rms value of the input signal. For example, if you are
applying a 100-Vrms sinusoidal signal, set the range to 100 V.
• When measuring a signal other than a sine wave (such as a distorted wave), accurate
measurements can be obtained by selecting the smallest measurement range that does not
produce any of the conditions below.
• The input peak over-range indicator at the top center of the screen lights or blinks in red.
• The measured values of the voltage and current are indicated as over range ("-OL-").
• The peak over-range indicator may not light or blink in the following cases.
• If the pulse width is narrow, and the peak value of the waveform cannot be acquired at
the sampling rate of the WT500 (approximately 100 ks/S).
• If the high frequency components of the pulse waveform attenuate due to the bandwidth
limitations of the WT500 measurement circuit, causing the waveform peak value to be
less than the peak over-range detection level.
Displayed when the voltage auto range feature is on
Current range
or ) is
IM 760201-01E