Does anyone know of a programming guide for the SDG1000X series that is later than the version hosted at the NA and EU Siglent sites? That is version PG02-E04A, and it does not agree with the instrument's behavior in some cases.
While some discrepancies are minor1, others are not. Here, for example, is what the instrument reports when set up for PWM modulation; emphasis added:
C1:MDWV STATE,ON,PWM,MDSP,SINE,SRC,INT,FRQ,333HZ,DEVI,3.115081301e-06S,DDEVI,38.3155,CARR,WVTP,PULSE,FRQ,123000HZ,AMP,2.8288V,AMPVRMS,1.4144Vrms,OFST,0V,DUTY,61.5,RISE,1.68e-08S,FALL,1.68e-08S,DLY,0
The programming guide says that the PWM parameter "DEVI" specifies percentage. "<PWM dev> := Duty cycle deviation. The unit is "%". Value depends on the carrier duty cycle .", from page 23, Section 3.5. But as shown above the instrument actually dimensions that parameter in seconds, not as a percentage.
And the parameter "DDEVI" which follows is not mentioned in the documentation at all.
I'm wondering if there might be a corrected and updated version of the programming guide available somewhere.
- Hexley
1Note, for example, that the modulation type (PWM, in this example) follows the "STATE,ON," fields in the output string shown above, whereas the example in the manual shows it coming before the STATE fields. Or note that the carrier amplitude is reported in both V and Vrms, though the documentation doesn't include Vrms in the description of the CARR,AMP field, saying only "<amplitude>:= carrier amplitude. The unit is volts, peak to peak Vpp "". These are indeed minor issues, of course, but they illustrate a few of the differences between the manual and the actual instrument.