BNC 1105 Universal Counter - Manual (Page 41)

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negative, auto and time. This is to specify how measurement should
stop. Positive and negative specifies the slope of the stop arm signal.
Time is to set the duration of measurement. As time is selected, use
the numeric keypad or the arrow keys to input a desired duration
value (refer to Ch.4.2.1). The time unit will be shown on the
top-right corner after the input is completed.
Remote Interface Commands
Auto arming:
[:SENSe]:FREQuency:ARM[:STARt]:SOURce IMMediate
[:SENSe]:FREQuency:ARM:STOP:SOURce IMMediate
Digits arming:
[:SENSe]:FREQuency:ARM[:STARt]:SOURce IMMediate
[:SENSe]:FREQuency:ARM:STOP:SOURce DIGits
[:SENSe]:FREQuency:ARM:STOP:DIGits <numeric value>
Time arming:
[:SENSe]:FREQuency:ARM[:STARt]:SOURce IMMediate
[:SENSe]:FREQuency:ARM:STOP:SOURce TIMer
[:SENSe]:FREQuency:ARM:STOP:TIMer <numeric value>
External arming:
[:SENSe]:FREQuency:ARM[:STARt]:SOURce EXTernal
[:SENSe]:FREQuency:ARM[:STARt]:SLOPe POSitive|NEGative
[:SENSe]:FREQuency:ARM:STOP:SOURce IMMediate
[:SENSe]:FREQuency:ARM:STOP:SOURce EXTernal
[:SENSe]:FREQuency:ARM:STOP:SLOPe POSitive|NEGative
[:SENSe]:FREQuency:ARM:STOP:SOURce TIMer
[:SENSe]:FREQuency:ARM:STOP: TIMer <numeric value> [s]
For rise/fall time, duty cycle and width measurements:
Press the Time & Period and Gate & ExtArm buttons, and then toggle
between auto and external under the softkey Gate.
■ If Auto Arming is selected, the Counter automatically starts
continuous measurements.
■ If External Arming is selected, press the softkey under SLOPE to
toggle between Positive and Negative. This is to specify the slope of
the external start arm signal.