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28 Agilent E1538A Enhanced Frequency/Totalize/PWM SCP
Variable Frequency
Square-Wave Pulse Train
(FM)
This means that the E1538 outputs a continuous train of pulses whose
frequency is controlled by the algorithm. The the duty-cycle of the waveform
is always 50%. Use the following command sequence:
SOURce:FUNCtion:SQUare (@<ch_list>) to enable square-wave
generation.
SOURce:FM[:STATe] ON,(@<ch_list>) to select the FM mode.
The frequency value sent by the algorithm can range from 64Hz to 40KHz.
The frequency resolution is
To configure channel 45 to output variable frequency continuous train with
50% duty cycle (square wave)
SOUR:FUNC:SQUARE (@145)
channel sources square wave...
SOUR:FM ON,(@145)
and continuous PWM train
The algorithm can now output a frequency value to channel 45:
O145 = 2000 /* channel 45 will source 2 KHz square wave */
f
out
2
4.194 MHz
---------------------------
Figure 19. Output Square Wave Variable Frequency (FM)