DJ Equipment User Manual

54 Agilent E1538A Enhanced Frequency/Totalize/PWM SCP
Parameters
Comments • This function can only be linked to the E1538’s first channel. The
function works for wheels that have either a missing, or an extra tooth
to mark their index position. Figure 14 on page 23 shows a wheel sensed
with a variable reluctance sensor (using the VRS input option), but any
wheel sensing method is applicable as long as it provides a digital output
to the RVEL channel.
• The value read by the algorithm can range from RPS to
RPS.
• As well as sensing rotational velocity, SENS:FUNC:RVEL provides the
reference position to the SOUR:FUNC:RPULse function that generates
angular positioned pulses. See page 30 for more information on
RPULse.
• <n_teeth> is the number of teeth that the wheel would have if it didn’t
have missing or extra teeth. For example, we would set <n_teeth> to 12
for the wheel shown in Figure 14 on page 23, even though with the
missing tooth, there are only 11.
• <index_type> can be either of the strings "MISSing", or "EXTRa"
• <ch_list> must be the first channel on the SCP, but can contain more
than one channel provided that each channel is on a separate
E1538. See
following note. The related Error Messages are:
3110, "Channel specified is invalid for RVELocity function.
Note Only one channel on any E1538 SCP can be assigned to the
SENS:FUNC:RVEL function, and it must be the first channel on the SCP.
• *RST Condition: SENS:FUNC:COND and INP:POL NORM for all
digital SCP channels.
• Send with VXIplug&play Function: hpe14XX_cmd(...)
Usage See “Sense Rotational Velocity” on page 22.
SENSE:FUNC:RVEL 12,MISSING,(@140)
12 toothed wheel with one
missing, from channel 40
Parameter
Name
Parameter
Type
Range of
Values
Default
Units
N_teeth numeric (int32) 3 to 255 none
index_type string MISSing | EXTRa none
ch_list string 100 - 163 none
1
nteeth
--------------
100 000,
nteeth
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