Multimeter and signal generator question

I own a basic multimeter and I would like to inject 0.775V for calibration. I don't own a signal generator so I thought maybe I could use the output of my soundcard and measure it with the voltmeter. However, as you would guess the basic multimeter only shows the first digit after the dot. so it says 0.7V so I can't be sure..Is there any voltmeter that doesn't cost lots of money (I am only a hobbyist) yet still accurate and more detailed? Or any other technique to be able to inject 0.775V?

Cheers,
Emre

Most cheap DMM's are not very accurate over a couple of hundred hertz on the ACV setting, so the reading could be way off at 1kHz. More expensive meters will be more accurate and some even have a dBm setting for audio work.

You can always build your own audio millivoltmeter fairly easily, and there are a few circuits available on the web:

http://sound.westhost.com/project16.htm
http://www.electronics-lab.com/projects/audio/020/
http://www.siliconchip.com.au/cms/A_111191/article.html

You may even find a kitset for one at your local electronics hobbyist store.
This piece of test equipment is extremely useful if you are working with audio circuits and need sensitive readings in the audio band. They are usually powered with 9V batteries to eliminate problems with ground loops and PSU noise, which makes construction a whole lot easier.

If you are persistent you could also find an Oscilloscope on e-bay for not too much money.
I got a really nice dual trace 25mhz scope for around 100 bucks.  It's totally paid for itself in troubleshooting and calibration duties.

Thank you both of you guys!! Excellent information!!

Cheers,
Emre

One more question:

Is my multimeter be still not accurate enough if I used pink noise? and also is it too important to feed exactly 0.775V as I will already adjust the input gain know until the meter shows +1db during bias calibration?

The ACV range on the DMM is designed to accept low frequency sine waves (ie 50/60Hz for AC line readings). If you look at its manual it will usually tell you the frequency response and accuracy.

It's probably not too critical to have exactly 775mV going into the unit. However I would not use the meter in the unit to read the level settings, as it is still an uncalibrated untested measuring device. Use a known working accurate measuring device to make the settings and check whether the VU meter is showing the correct levels (the VU meter reads the output level). In GR metering mode you need to use the internal meter to calibrate it.

Geoff, thanks a lot.