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Agilent E1538A Enhanced Frequency/Totalize/PWM SCP 27
Variable Frequency Fixed
Width Pulse Train (FM)
This means that the E1538 outputs a continuous train of pulses whose
frequency is controlled by the algorithm. The logic 1 level pulse width is set
by a SCPI command before INIT. Use the following command sequence:
SOURce:FUNCtion:PULSe (@<ch_list>) to enable pulse generation.
SOURce:FM[:STATe] ON,(@<ch_list>) to select the FM mode.
SOURce:PULSe:WIDTh <width>,(@<ch_list>) to pre-set the pulse width
of the logic 1 portion of the waveform. <width> can range from 7.87µSec to
7.812mSec.
The frequency value sent by the algorithm can range from 128Hz to 40KHz.
The frequency resolution is
To configure channel 45 to output variable frequency continuous train with
fixed pulse width
SOUR:FUNC:PULS (@145)
channel sources pulses...
SOUR:FM ON,(@145)
and continuous pulse train
SOUR:PULS:WIDT .001,(@145)
1 msec fixed pulse width
The algorithm can now output a frequency value to channel 45:
O145 = 250 /* channel 45 will source 250 Hz pulse train */
f
out
2
4.194 MHz
---------------------------
Figure 18. Output Fixed Pulse Width Variable Frequency (FM)