RIGOL Chapter 7 Logic Analyzer
7-6 MSO4000/DS4000 User’s Guide
Note:
“L” is only available when the number of digital channels currently turned on is
not more than 8.
If the current display size of the digital channel waveforms is “L”, WaveSize will
switch to “M” automatically when more digital channels are turned on latterly
making the number of channels turned on exceeds 8.
To Adjust the Threshold Level
You can set the threshold levels of the two channel groups independently according
to your need for the threshold levels of the two channel groups (D7-D0 and D15-D8)
can be adjusted independently. When the voltage of the input signal is greater than
the threshold level currently set, it is regarded as logic “1”; otherwise logic “0”.
Press LA Threshold to enter the threshold setting submenu. In this menu,
1. Select the threshold type
Press Type; turn the multi-function knob to select the desired threshold type
and press the knob. You can also press Type continuously to switch he current
threshold type. You can select the preset level types or “User”. The preset level
types include TTL (1.4V), 5.0V CMOS, 3.3V CMOS, 2.5V CMOS, 1.8V CMOS, ECL
(-1.3V), PECL (3.7V), LVDS (1.2V) and 0V.
2. Set the threshold level of the specified channel group
When the “threshold type” is set to the any of the preset type,
a. Press AppToD7-D0 to apply this threshold level to channels D7 to D0.
b. Press AppToD15-D8 to apply this threshold level to channels D15 to
D8.
When the “threshold type” is set to “User”,
a. Press D7-D0 and turn the multi-function knob to adjust the
threshold level of channels D7 to D0 (pressing the knob can quickly
reset the threshold level of channels D7 to D0 to 0 V). The adjustable
range is from -20.0 V to +20.0 V.
b. Press D15-D8 and turn the multi-function knob to adjust the
threshold level of channels D15 to D8 (pressing the knob can quickly
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