User Manual

3.5 Model 8940 F/V Unit Settings
53
3.5.3 Pulse Duty Measurement
Setting Procedure
Use the CURSOR keys to move among items. Select a setting with the F1 to F8 keys.
Step
Setting Item
Description
1
Select the module No.
[Unit ]
Select the number of the input module to set up.
("Channel Configuration" (
⇒ p. 15))
2
Select the channel No.
[Ch ]
Select the channel number on the input module.
3
Confirm the module
[Module]
Confirm that the display is set for [F/V].
4
Select the measurement mode
[Mode]
Select [Duty].
5
Select the low-pass filter
[LPF]
To suppress high-frequency components, select a low-pass
filter within the input module (
⇒ p. 66).
[ Off, 5Hz, 500Hz, 5kHz or 100kHz ]
6
Select the probe attenuation
[Probe]
Select according to the cable or probe being used
(
⇒ p. 75)
[ 1:1, 10:1, 100:1, 1000:1(9322+9325) or 1000:1(9322+9418) ]
7
Set the threshold level
[Threshold]
Set the threshold level (⇒ p. 72).
8
Set pull-up
[Pull-Up]
Enable (set On) the pull-up resistance when connecting to an
open-collector output signal. Disable it (Off) for normal mea-
surements
(⇒ p. 71).
[ Off or On ]
Set up scaling
Set as occasion demands.
See
"5.4 Converting Input Values (Scaling Function)" in the
Instruction Manual
([One Ch] Page of Channel Setting Screen)
7
12 3
4
5
6
8
The [Frequency] measurement mode is
selected upon system reset.
Pulse duty measurement
If a rising pulse (at 20 kHz or above) is applied during calculation (“dead time”),
the duty during the dead time cannot be measured. Duty is measured from the
pulse following the dead time.
Calculation (50 µs)
Waveform Acquisition
Waveform Acquisition
Ignored