HP 53131A/132A 225 MHz Programming Manual page 228

Chapter 4 Command Reference
Measurement Instructions (:CONFigure, :FETCh, :MEASure, :READ)
Descriptions of the Measurement Functions— <function> (Cont.)
:MEASure[:SCALar][:VOLTage]:FALL:TIME?
[<lower_reference>[,upper_reference>]][,(@1)]
Measures Fall Time.
The measurement arming is coupled to "auto."
The Counter uses the <lower_reference> and <upper_reference> to select the
lower and upper points on the falling edge of an input signal applied to channel 1.
These reference points can be specified as either a percentage or an absolute
voltage. The default units are percent.
The <lower_reference> and <upper_reference> parameters are used to configure
the Channel 1 and Channel 2 trigger settings, respectively. When a reference is
specified as a percentage (or defaulted),
auto-trigger is enabled and auto-trigger level is set to the specified
(or defaulted) value. When a reference is specified in volts,
auto-trigger is disabled and the absolute trigger level is set to the specified value.
<lower_reference>
percent range:
percent resolution:
voltage range:
voltage resolution:
default:
<upper_reference>
percent range:
percent resolution:
voltage range:
voltage resolution:
default:
4-62
0 to 100 [PCT]
10%
For volts if X1 Attenuation: -5.125V to +5.125V
For volts if X10 Attenuation: -51.25V to +51.25V
For volts if X1 Attenuation: .005V
For volts if X10 Attenuation: .05V
10 PCT
0 to 100 [PCT]
10%
For volts if X1 Attenuation: -5.125V to +5.125V
For volts if X10 Attenuation: -51.25V to +51.25V
For volts if X1 Attenuation: .005V
For volts if X10 Attenuation: .05V
90 PCT
Programming Guide