Setting the function generator's frequency
Hi all,
Been pleased with the propscope overall, but I'm having an issue specifying an exact frequency for the function generator feature.· Not sure if this is a limitation of the GUI or if it also reflects a hardware issue.
I am trying to make some fairly tight measurements of a 200kHz sonar transducer's response.· Since the transducer is essentially a piezoelectric device, it changes rapidly in behavior near the series and parallel resonant frequencies.· I was hoping to use small frequency steps (i.e. 50 - 100Hz)in the vicinity of 200kHz but find that the GUI rounds off the value back to 199k, 200k, or 201k.
Is there a way to specify a more exact frequency such as 199950Hz?· Given the nature of the propScope's timing, I would have guessed this to be possible?· Am I missing anything obvious?
v/r,
Glen Gordon
Been pleased with the propscope overall, but I'm having an issue specifying an exact frequency for the function generator feature.· Not sure if this is a limitation of the GUI or if it also reflects a hardware issue.
I am trying to make some fairly tight measurements of a 200kHz sonar transducer's response.· Since the transducer is essentially a piezoelectric device, it changes rapidly in behavior near the series and parallel resonant frequencies.· I was hoping to use small frequency steps (i.e. 50 - 100Hz)in the vicinity of 200kHz but find that the GUI rounds off the value back to 199k, 200k, or 201k.
Is there a way to specify a more exact frequency such as 199950Hz?· Given the nature of the propScope's timing, I would have guessed this to be possible?· Am I missing anything obvious?
v/r,
Glen Gordon
Comments
I'm 99% sure that the round-off happens at display time- so the PropScope is still generating the exact frequency you want- down to .1 of a hz. So, feel free to output a 1,234,567.8Hz sine wave...
I'll look into fixing the display issue.
Hanno
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Co-author of the official Propeller Guide- available at Amazon
Developer of ViewPort, the premier visual debugger for the Propeller (read the review here, thread here),
12Blocks, the block-based programming environment (thread here)
and PropScope, the multi-function USB oscilloscope/function generator/logic analyzer