VXI VT1538A user manual SENSeFUNCtionRVELocity

Parameters

Parameter	Parameter	Range of	Default
Name	Type	Values	Units
preset_count	numeric (int32)	0 to 16,777,215	none
ch_list	string	100 - 163	none

Comments • <count_preset> if included, allows presetting the absolute counter associated with the channel pair. All quadrature pairs in <ch_list> will be preset to the same value. If not included, the default count at algorithm start will be zero.

•<ch_list> must always specify both channels of a pair. More than one pair can be specified. Both channels of any pair must be adjacent. <ch_list> can specify channels on more than one E1538. The channel numbers in <ch_list> must be in ascending order. The related error messages are:

3115, "Channels specified are not in ascending order."

3116, "Multiple channels specified are not grouped correctly." 3117, "Grouped channels are not adjacent."

3122, "This multiple channel function must not span multiple SCPs."

•The algorithm reads the current count through the low numbered channel. The count is an unsigned 24-bit value ranging from 0 to 16,777,215. The counter can roll over from 16,777,2215 to 0, and roll under from 0 to 16,777,215 is 16,777,215.

•*RST Condition: SENS:FUNC:COND and INP:POL NORM for all digital SCP channels.

•Send with VXIplug&play Function: hpe14XX_cmd(...)

Usage See “Sense Quadrature Position” on page 21.

SENS:FUNC:QUAD 8192,(@142,143)

pair 42&43 will return quad count (on ch 142), count preset to 8192

[SENSe:]FUNCtion:RVELocity

[SENSe:]FUNCtion:RVELocity <n_teeth>,<index_type>,(@<ch_list>)

configures the first channel on E1538s to measure the rotational velocity of

atoothed wheel sensor. The E1538 measures tooth-to-tooth period and converts it into units of revolutions per second (RPS). See “Sense Rotational Velocity” on page 22.

Agilent E1538A Enhanced Frequency/Totalize/PWM SCP 53