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July 18th 08, 12:58 PM
posted to rec.radio.amateur.homebrew
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Measure Signal Generator with Oscilloscope?
Michael Black wrote:
On Thu, 17 Jul 2008, Bert Hyman wrote: () wrote in : I know the scope is working because its 1K hz calibration signal looks fine. Well, you know that the path from the calibrator through the scope is OK, but probably nothing about the external inputs. The only scope calibrators I've seen have been a jack or something on the front panel of the scope, so when you touch the probe to it, you take into consideration the scope probe, the cable to the scope and the input circuitry. The "scope calibrator" is as useful for a quick check like this as an potential calibrating use. The generator dial goes from 100 KC to 30 MC. Is this too high a frequency to be monitored with a 465? The 465's specs were DC to 100MHz. And as someone pointed out when he asked elsewhere, a digitally tuned radio will be useful. Even an analog, since you can at least tell if the generator is putting out a signal by tuning the radio and the generator to the same frequency, and adjusting one slightly if there's no output (to ensure one isn't off-frequency). A shortwave radio has the advantage over the average table radio since it can tune higher in frequency. When I had an SP-600, it was about the best piece of test equipment I had. Michael VE2BVW Well you should see the signal fine on a 100MHz 465. I have a very similar generator and I was just using it today to set up some filters with no problems at ~7.8 Mhz, using a 60Mhz Telequipment scope. Does that model Heath sig Gen have an output meter? Make sure the coarse attenuator switch and fine level adjustments are fully clockwise. You should get more than full scale on the meter when switched to Rf level. If thats Ok then you should get around 100mV or more at the scope input. Are you perhaps using a /100 probe, there are a few around. Most scope probes are x1 or /10 switched though. If the scope is indeed working and your trigger is set to auto with the Y input at ~50Mv/div you should get plenty of signal at all of the generators frequency range. If no display then you may have trigger problems at higher freqencies with the scope. Cliff Wright ZL1BDA |
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