I bought a used signal generator today. I want to check if it works with no problem but I don't have access to an oscilloscope right now. I have a multimeter that can measure dc and ac voltage and also frequency. When I connect it to the generator it shows the exact frequency that the generator is set to, so there's no problem there. I also checked the DC-offset feature with DC voltage measurement, no problem there as well.
But when I try to measure the ac amplitude I get 300mv rms when the generator is set to 20v peak to peak and no logical relation to the value shown on the generator in lower amplitudes. I checked the multimeter with 220vac and there was no problem with it. I also checked it with a dc power supply I have and there was no problem with the multimeter there neither. I connected the output of the generator to a simple half-wave rectifier circuit I made with a resistor, a capacitor and a diode and measured the output dc voltage with the multimeter and it shows ((Vp-p)/ 2 )* 0.68 for the sine wave which is around 30% lower than what I expect. the diode on voltage is 0.55 R=1k and C=470uF. So there is actually a somehow valid output amplitude on the generator but I can't see it directly with my multimeter.
I also tried lowering the frequency but I still couldn't measure the ac voltage directly with the multimeter. It seems that both the generator and the multimeter are working fine but somehow I can't measure the ac output rms value of the generator with the multimeter. What do you think the problem is here?
I have PNP and NPN transistors and diodes if you want to suggest another test with a simple circuit. The generator is an MFG-8306 from MCH Instruments and the multimeter is a Victor VC97.