Agilent Technologies Infiniium 90000 Q-Series, Programmer'S Manual

Page: 273 / 1186

Digital Commands
14
Agilent Infiniium 90000 Series Oscilloscopes Programmer's Reference 273
:DIGital<N>:THReshold
Command
:DIGital<N>:THReshold {CMOS50 | CMOS33 | CMOS25 | ECL | PECL | TTL
| DIFFerential | <value>}
The :DIGital<N>:THReshold command sets the logic threshold value for a
pod. Setting the threshold for digital channels 0 through 7 sets the
threshold for pod 1 while setting the threshold for digital channels 8
through 15 sets the threshold for pod 2. This command is equivalent to
the POD<N>:THReshold command.
The threshold is used for triggering purposes and for displaying the digital
data as high (above the threshold) or low (below the threshold). The
voltage values for the predefined thresholds are:
• CMOS50 = 2.5 V
• CMOS33 = 1.65 V
• CMOS25 = 1.25 V
• ECL = - 1.3 V
• PECL = 3.7 V
• TTL = 1.4 V
• DIFFerential = 0 V
<N> An integer, 0- 15.
<value>
A real number representing the voltage value which distinguishes a 1 logic
level from a 0 logic level. Waveform voltages greater than the threshold are
1 logic levels while waveform voltages less than the threshold are 0 logic
levels.
The range of the threshold voltage is from - 3.75 volts to 3.75 volts.
Example This example sets the threshold to 1.8 volts for bits D15 through D8.
myScope.WriteString ":DIGital8:THReshold 1.8"
Query
:DIGital<N>:THREShold?
The :DIGital<N>:THReshold? query returns the threshold value for the
specified pod.
Returned Format
[:DIGital<N>:THReshold] {CMOS50 | CMOS33 | CMOS25 | ECL | PECL | TTL
| DIFF | <value>}<NL>
N O T E
The DIGital commands only apply to the MSO oscilloscopes.