HP E1429A manual ARMSTARtCOUNt, Syntax, Subsystem

ARM[:STARt]:COUNt

∙The active edge for generation of an arm event (ARM:STARt:SLOPe<n >) on the selected arm source (n = 1 or n = 2).

∙The measurement signal level to attain before allowing a measurement to begin (ARM:STARt:LEVel<n>). This is used with ARM:SOURce INTernal<n>. It is also possible to create a window bounded by two levels (ARM:LEVel:POSitive and ARM:LEVel:NEGative) such that arming occurs when the signal level either exits or enters the defined window.

∙The additional delay between the arm event and entry into the wait-for-trigger state (ARM:DELay).

Subsystem	ARM
Syntax	[:STARt :SEQuence[1]]
	:COUNt <count>
	:DELay <period>
	[:IMMediate]	[no query]
	:LEVel<chan >
	:NEGative <voltage>
	:POSitive <voltage>
	:SLOPe[<n>] <edge>
	:SOURce[<n>] <source>

[:STARt]:COUNt

ARM[:STARt]:COUNt <count> specifies how many measurement cycles will occur after an INITiate, before the trigger system returns to the idle state. Each post-arm measurement cycle begins when the event specified by the active arm source(s) occurs. Multiple readings may be taken during each cycle, as defined by the TRIGger:STARt:COUNt or SENSe:SWEep:POINts commands.

ARM:STARt:COUNt values greater than 1 in conjunction with pre-arm readings is a special case which causes memory to be partitioned. Partitioning is done because a large number of pre-arm readings may be taken before the arming event, while a smaller number of pre-arm readings will actually be kept for read back. Therefore, for each ARM:STARt:COUNt specified, a separate circular buffer (partition) is set up to hold the specified number of "desired total readings" (TRIGger:STARt:COUNt). With this scheme, pre-arm data may overwrite itself until the arming event occurs, at which time, the post-arm data count will be completed by overwriting the oldest pre-arm data. Due to this complexity, the ARM:COUNt for this type of measurement is restricted to a much lower value than what can be specified if all data is post-arm only.

ARM Subsystem Command Reference 187