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| PSG9080 Counter not calibrated to signal generator |
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| Mike Oglesby:
Newbie here but have searched the forum to no avail. My Juntek Psg9080 is gpsDO calibrated to a frequency of 10Mhz, but measures 67hz high when fed to the frequency counter. I have the Freq fine tuning set to 63 which calibrates the signal generator to my gpsDO using my two channel o-scope. Has anyone figured out how to calibrate the frequency counter to match the signal generator? All I know to do at this point is to always subtract 67hz from frequency counter reading. |
| wasedadoc:
--- Quote from: Mike Oglesby on February 15, 2023, 04:28:39 pm ---All I know to do at this point is to always subtract 67hz from frequency counter reading. --- End quote --- Well you are off to a bad start there. You do not subtract 67Hz. You need to scale all readings (ie multiply or divide) by some number close to 1. If you input 10 MHz and the reading is 10,000,067 then you should divide by 1.0000067 or multiply by the inverse of that. |
| Mike Oglesby:
Thanks for the heads up, I should have thought of that since scaling over many frequencies. I still hope someone has information on how to calibrate the frequency counter separate from the signal generator. Maybe it can be done in firmware? |
| BillyO:
Do you mean you replaced the internal oscillator with a GPSDO? |
| Mike Oglesby:
No, I used the gpsDO as a reference to fine tune the signal generator oscillator output at 10Hhz. The signal generator now agrees with the gpsDO at 10Mhz, but when I hook signal generator part to the frequency counter, the frequency counter counts about 66 hz high. I hope someone can figure out the PSG9080 circuits well enough to figure out how to calibrate the signal generator to match the frequency counter. I emailed the Juntek website with this problem but have no response so far. |
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