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26 Agilent E1538A Enhanced Frequency/Totalize/PWM SCP
Variable Width Pulse
Train (PWM)
This means that the E1538 outputs a continuous train of pulses whose logic
1 pulse width is controlled by the algorithm. The frequency is set by a SCPI
command before INIT. Use the following command sequence to set up this
mode:
SOURce:FUNCtion:PULSe (@<ch_list>) to enable pulse generation.
SOURce:PULM[:STATe] ON,(@<ch_list>) to select the PWM mode
SOURce:PULSe:PERiod <period>,(@<ch_list>) to set the pulse repetition
period (frequency = 1/<period>). <period> can range from 25µSec to
7.812mSec.
The pulse width value sent by the algorithm can range from 7.87µSec to
<period>-7.87µSec. Resolution within this range is 238.4nSec.100%
duty-cycle is output when the algorithm sends a value greater than or equal
to <period>. 0% duty-cycle is output when the algorithm sends a value less
than or equal to 0.
To configure channel 45 to output a variable pulse width continuous train
SOUR:FUNC:PULS (@145)
channel sources pulses...
SOUR:PULM ON,(@145)
and continuous PWM train
SOUR:PULS:PER .0005,(@145)
.5 msec period (2KHz freq)
The algorithm can now output a value to channel 45 to control pulse width
of the logic 1 portion of the waveform:
O145 = 333E-6 /* channel 45 pulse width will be 333 µsec */
Figure 17. Output Pulse-Width-Modulated Signal