VXI VT1538A user manual Variable Frequency Square-Wave Pulse Train FM

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.

	2
	fout
The frequency resolution is	4.194 MHz
	---------------------------

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 */

Figure 19. Output Square Wave Variable Frequency (FM)

28 Agilent E1538A Enhanced Frequency/Totalize/PWM SCP