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34 Agilent E1538A Enhanced Frequency/Totalize/PWM SCP
SOURce:RPULse:POSition[:ANGLe] <degrees>,(@<ch_list>), to preset
the angular pulse position in degrees. The algorithm will control the pulse
duration.
SOUR:RPULse:VARType ANGLe,(@<ch_list>) to set the type of value
that will vary with algorithm control (in this case pulse width ANGLe).
Example of variable width (by angle), preset position:
Set up channel 40 as the reference channel, and channels 45 through 47 to
output variable width pulses:
*RST
SENS:FUNC:RVEL 12,MISS,(@140)
sense rvel for reference channel
SOUR:FUNC:RPULSE (@140),(@145:147)
3 rotational pulse output chans
SOUR:RPULSE:POS:ANGL 20,(@145)
preset channel 45 pulse position
to 20 degrees
SOUR:RPULSE:POS:ANGL 140,(@146)
preset channel 46 pulse position
to 140 degrees
SOUR:RPULSE:POS:ANGL 260,(@147)
preset channel 47 pulse position
to 260 degrees
SOUR:RPULSE:VART ANGL,(@145:147)
algorithm will control pulse
width by ANGLE
Algorithm outputs pulses on all three channels with variable width.
ALG:DEF ’ALG1’,’static float Width1, Width2, Width3;O145 = Width1; O146
= Width2; O147 = Width3;’
ALG:SCALAR’ALG1’,’Width1’,5
preset ch 45’s pulse width to 5°
ALG:SCALAR’ALG1’,’Width2’,10
preset ch 46’s pulse width to 10°
ALG:SCALAR’ALG1’,’Width3’,15
preset ch 47’s pulse width to 15°
ALG:UPDATE
.
INIT
start algorithm execution
•
•
calculate NewWidth(n)
•
ALG:SCALAR 'ALG1','Width1',NewWidth1
later, adjust channel 45’s width
while algorithm is running
ALG:SCALAR 'ALG1','Width2',NewWidth2
later, adjust channel 46’s width
while algorithm is running
ALG:SCALAR 'ALG1','Width3',NewWidth3
later, adjust channel 47’s width
while algorithm is running
ALG:UPDATE