BNC 1105 Universal Counter - Manual (Page 129)

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Numeric data transferred as ASCII bytes in 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]:? [,]
The above command is the generic form of the :MEASure? Commands.
Skipping the and the will instruct the counter
to use defaults. The description of each command :MEASure? is listed
below.
:MEASure[:SCALar][:VOLTage]:DCYCle? [][,(@1)]
Sets the measurement arming to “auto” and measures Duty Cycle with the specified
parameters.
The 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 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.
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
default (@1)
range (@1)