User Manual

7 Protocol Decoding RIGOL
DS4000 User’s Guide
7-3
example, when the bus bits is 20, the range available is 0, 1…19.
Next, press Channel to specify a channel source for the bit currently
selected in CurrentBit.
3. Analog Channel Threshold Setting
To judge logic “1” and logic “0” of the buses, you need to set a threshold for
each analog channel (CH1, CH2, CH3 and CH4). When the signal amplitude is
greater than the preset value, it is considered as “1”; otherwise “0”.
Threshold
Level
1
0
0
Press Threshold to turn the threshold setting menu on.
Channel
Select the channel that needs to set a threshold.
Set to TTL
Press this softkey to set the threshold of the specified channel
to TTL level immediately.
Set to CMOS
Press this softkey to set the threshold of the specified channel
to CMOS level immediately.
Set to ECL
Press this softkey to set the threshold of the specified channel
to ECL level immediately.
Threshold
Press this softkey and use to set the threshold. The
default is 0 V.
Note: the TTL level, CMOS level, ECL level and the threshold value all depend on
the vertical scale setting of the current channel.
4. Display-related Setting
Press Format to set the display format of the bus to Hex, Decimal, Binary or
ASCII.
Press Offset and use to adjust the vertical display position of the bus.
Press BusStatus to turn the bus display on or off.