2-2
IM DLM3054-01EN
Threshold Level (Threshold, Level)
Set the level (threshold level) of the logic signal to detect, high or low.
Preset (Threshold)
Selecting from the following presets automatically sets the threshold level.
If you select User, you can set the level in the range of −10 V to 10 V in 0.1 V steps.
CMOS(5 V)
2.5 V
CMOS(3.3 V)
1.6 V
CMOS(2.5 V)
1.2 V
CMOS(1.8 V)
0.9 V
ECL
−1.3 V
User
−10.0 V to 10.0 V
The selectable range varies depending on the logic probe that you use.
• Model 701988: ±40 V (in 0.05 V steps)
• Model 701989: ±6 V (in 0.05 V steps)
Setting Whether to Set the Threshold Level Separately for Each Bit (ThresholdType)
When the 701989 logic probe is connected, you can select whether to set the threshold level separately for each
bit.
• All: Set the threshold level of all bits to the same value
• Each: Set the threshold level for each bit
When you connect one of the following logic probes to the instrument, Threshold Type is set automatically.
• Model 701988: Fixed to All. The setup menu does not appear.
• Model 701989: Each (select All or Each)
Noise Rejection (Noise Rejection)
When the 701989 logic probe is connected, you can apply hysteresis to the threshold level so that the high and
low states do not change as long as the signal level changes within that range.
Select the hysteresis from one of the following settings below.
Hysteresis of approximately 100 mV around the threshold level*
Hysteresis of approximately 250 mV around the threshold level*
* The above values are approximate values. They are not strictly warranted.
The hysteresis is fixed at approximately 80 mV for the 701988 logic probe, so the setup menu will not appear.
2 Vertical Axis (Logic Signal)
