Hioki MR8740, Instruction Manual

Page: 176 / 424

7.9 Making Detailed Settings for Input Modules
164
See: Opening the [Each Ch] sheet, Making a Channel Selection (p.159)
Mode
Changes the measurement mode.
Select
VRange
(Input voltage)
Set the maximum level for the input signal.
Select
Threshold
• When the measurement waveform exceeds the threshold value, the measure-
ment value is acquired based on the time interval and the number of times the
threshold was exceeded.
• The threshold value upper and lower limits and increases and decreases in
width depend on the input voltage ( [VRange] ) setting.
• While setting the threshold, the voltage level is displayed on the level monitor.
7.9.5 Settings for the 8970 Freq Unit
When the display of standard logic channels (LA and LB) is on, the 8970 Freq
Unit installed on unit 1 can no longer be used.
Selections Description
Frequency
Measure the frequency of the measurement waveform (Hz hertz)
(default setting)
RPM
Measure the number of rotations of the measurement target (r/min
rotations/minutes)
P-Freq
Measure the power frequency variation (Hz hertz)
Count
Add up the number of input pulses
Duty
Measure the duty rate of the measurement waveform (% percent)
Pulse Width
Measure the pulse width (s second)
Pulses with rises during dead time (calculation) (25 kHz or higher) cannot be
measured.
Waveform
loaded
Waveform
loaded
Calculation (40
μ
s)
Ignored
±10 V (default setting), ±20 V, ±50 V, ±100 V, ±200 V, ±400 V
To prevent measurement errors due to noise, the threshold has a hysteresis of
approximately 3% versus the input voltage. (When
[VRange]
is [ ± 10 V] , it is
around ±0.3 V.)
Set a threshold in excess of the hysteresis width versus the voltage peak.