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Agilent E1538A Enhanced Frequency/Totalize/PWM SCP 31
Rotational Pulse Mode:
Variable Angular Position, Preset Pulse Width (by angle)
In this mode, the angular position of the pulses is controlled by the algorithm,
and the width (duration in degrees) is preset before INIT. See Figure 21.Use
the following command sequence:
SOURce:FUNCtion:RPULse (@<ref_channel>),(@<ch_list>) to select the
channels that will output angular positioned pulses, and to specify the
reference channel.
SOURCe:RPULse:WIDTh[:ANGLe] <degrees>,(@<ch_list>) to preset
the pulse width in degrees. The algorithm will control the angular pulse
position.
Example of variable position, preset width (by angle):
Set up channel 40 as the reference channel, and channels 45 through 47 to
output variable position 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:WIDT:ANGL 15,(@145:147)
preset pulse width to 15 degrees
Algorithm outputs pulses on all three channels with variable position.
ALG:DEF ’ALG1’,’static float Pos1, Pos2, Pos3;O145 = Pos1; O146 =
Pos2;O147 = Pos3;’
ALG:SCALAR’ALG1’,’Pos1’,60
preset ch 45’s pulse pos to 60°
ALG:SCALAR’ALG1’,’Pos2’,180
preset ch 46’s pulse pos to 180°
ALG:SCALAR’ALG1’,’Pos3’,300
preset ch 47’s pulse pos to 300°
ALG:UPDATE
.
INIT
start algorithm execution
•
•
calculate values for NewPos(n)
•
ALG:SCALAR 'ALG1','Pos1',NewPos1
later, adjust channel 45’s
position while algorithm running
ALG:SCALAR 'ALG1','Pos2',NewPos2
later, adjust channel 46’s
position while algorithm running
ALG:SCALAR 'ALG1','Pos3',NewPos3
later, adjust channel 47’s
position while algorithm running
ALG:UPDATE
values in update queue sent to
variables