Keysight 81150A - Page 158

Appendix
158
Upper Threshold Voltage
Introduction
The upper threshold voltage defines the voltage level at which a sample is
considered being a logical ‘1’. If the voltage at MOD-IN is above the upper
threshold voltage, then the external provided bit is considered being ‘1’. If
the voltage is above the lower threshold, but less than or equal to the upper
threshold, then the bit is considered being an idle symbol (will result in the
programmed offset voltage at the output).The upper threshold is only used
for 3-level signals.
- 1 1 1 - 01 0 - 1
Lower Threshold
Upper Threshold
Input Signal
Derived Logical Levels
NRZ
Output
Signal
User defined Bitshape
Output Signal
(Example only)
High Level
Low Level
1 / FrequencySampling Points
Leading Edge (on Pulse Screen)
Front Panel
Operation
 On the pattern mode screen press the Ext. Input Setup softkey.
 Press the Upper Threshold softkey.
 Enter the threshold voltage using the numerical keypad, or turn the
rotary knob to adjust the upper threshold voltage.
Remote Interface
Operation
:DIGital[1|2]:SOURce:EXTernal:THReshold:UPPer
{<volts>|MINimum|MAXimum}