I have a need to perform fine calibration.My phase lock loop circuit reference must be exact.
I am not able to manually enter frequencies to obtain my desired frequency of 100.0000Khz. Is there an internal master oscillator hardware adjustment control for the PCUG1000? Or is there a simple way of using a calibration software I can download.
My PCSGU250 GEN is off frequency even more also.
Thanks,
Steve
There is no hardware adjustment for the PCGU1000 frequency.
Fixed frequency crystal oscillator is used as a reference.
There is still a workaround to get exact 100.0000kHz output frequency:
You may check the error and enter a slightly different frequency to compensate the error.
Example: I checked the PCGU1000 frequency when the 100.0000kHz was entered as the frequency.
The real output frequency was: 99.9995kHz. There was 0.5Hz (5 ppm) error in the frequency.
This can be compensated by selecting the frequency range 100kHz - 2MHz and entering the frequency 100.0005 and pressing the “Enter” button to complete the frequency entry.
This method is working using a frequency counter, however a high stability time base option would be nice.
Thanks for your help.
Steve
While the PCGU1000 can do pretty amazing things for only a few hundred $$, you may be expecting a bit much from it. After all, it’s not a piece of lab reference equipment such as what you might buy from Agilent, Tek, or Fluke for $[many thousand]. Even if you hand-selected or trimmed down a slightly-high xtal, you still wouldn’t have sufficient drift stability in the sub-ppm range with this circuit.