UNI-T UPO2102 User Manual page 108

User's Manual
a. Preset value includes TTL, 5.0V CMOS, 3.3V CMOS, 2.5V CMOS, 1.8V CMOS, ECL, PECL, CLDS and 0V.
After a type is selected, the threshold level corresponding to that type is applied to the type.
b. "User-defined"：Adjusting Multipurpose knob to set the desired threshold. The range can set to -20.0
V ~ +20.0 V.
16.6 Data Bus Setting
User can set three digital channels D0-D7, D8-D15, D0-D15 or None to data bus according to your needs.
Each data bus value will display in the data or figure format on the bottom of the screen. Three digital channel
groups is displayed as data bus. MSO/UPO2000 allows user to create 2 data buses.
(1) Bus：It can be "BUS1" or "BUS2".
(2) Bus status: Turn on/off data bus.
(3) Quick selection: Select the corresponding channel group of BUS1 or BUS2, which can be D0-D7, D8-D15,
D0-D15 or None.
(4) Bit：Select the corresponding channel bit of the bus, which can be D0 ～ D15, CH1 or CH2.
(5) Bit order: Set the bus bit order, which can select "low to high"(D0 locate in low bit) or "high to low"(D0
locate in high bit).
(6) Clock： Select any one of channel （D0~D15, CH1, CH2） as the reference clock of bus. Select "NULL" means
not set the reference clock.
(7) Edge type: Set sampling edge type of reference clock, which can be "rising edge, falling edge".
(8) Display type: Select display format of data bus, which can be hexadecimal, decimal, binary system, ASCII
or figure. In figure display mode, the oscilloscope will display the bus data to the level of the
corresponding value in a specific way. It is convenient to observe the changing trend of bus value, as
shown in Figure 16-1.
(9) Shake proof: Turn on/off shake proof function.
Shake: It indicates the short-term deviation of a signal at a particular moment relative to its ideal time
position, as shown in Figure T1 and T2. If the bus is not select the reference clock, the hopping state of
each channel will cause the change of the bus data. When bus data changes, unnecessary data will
occurs due to the shaking. When shake proof is opened, the bus will not display the change in bus data
caused by a certain shake time, but still maintain the valid data.
(10) Shake time: Rotating outer layer of jog dial knob to adjust shake time with a large stepped value.
Rotating inner layer of jog dial knob to adjust shake time with a small stepped value. The range can set
to 0ns~50us.
Note: Shake proof and shake time can only be set when data bus has no reference clock.
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