BNC 1105 Universal Counter - Manual (Page 129)

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Numeric data transferred as ASCII bytes in <NR3> format with six
significant digits.
The value returned is 50.
The Commands :MEASure?
The command :MEASure is the simplest way to make a measurement. It
configures the counter, initiates the measurement and queries the result
all in one command.
:MEASure[:SCALar]:<function>? <parameters> [,<source_list>]
The above command is the generic form of the :MEASure? Commands.
Skipping the <function> and the <parameters> will instruct the counter
to use defaults. The description of each command :MEASure? is listed
below.
:MEASure[:SCALar][:VOLTage]:DCYCle? [<reference>][,(@1)]
Sets the measurement arming to “auto” and measures Duty Cycle with the specified
parameters.
The <reference> specifies the point on the pulse where the duty cycle is determined, and
it can be specified as either a percentage or an absolute voltage. The default is in
percentage.
The <reference> parameter is used to configure the trigger setting. When it is specified
in percentage or default, auto-trigger is enabled and trigger level is the specified value.
When it is specified in voltage, auto-trigger is disabled and the trigger level is the
specified value.
<reference> default 50 pct
Percent range 0 to 100 pct
Percent resolution 10%
Voltage range -5.125V to 5.125V for ×1 attenuation
-51.25V to 51,25V for ×10 attenuation
Voltage resolution
0.0025V for ×1 attenuation
0.025V for ×10 attenuation
<source list> default (@1)
range (@1)