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Title: test equipment: VTVM Post by: David, K3TUE on August 15, 2005, 10:32:47 PM I would like to know, other than for buzzard points, do I need a VTVM, or will my brand new RMS DMM do?
Title: Re: test equipment: VTVM Post by: WV Hoopie on August 16, 2005, 12:36:58 AM Hi Dave,
IMHO: Any high impedance meter that does not load the circuit under test will do the trick. I've used some latest and greatest DMM and at times go back to an old Radio Shack dual FET meter for no other reason than the analog meter is easier to read. Can't stand the digital display not knowing which way to go. The analog meter is slower and sometimes gives an indication easier to interpret. So with that said, I start with the DMM. If it can't handle the situation, switch to the old standby RS meter. Hoopie, Title: Re: test equipment: VTVM Post by: K2FW on August 16, 2005, 09:57:19 AM You can't beat the good old RCA/Viz WV-98C model VTVM's. They are not too costly & really work great!
Title: Re: test equipment: VTVM Post by: w3jn on August 17, 2005, 07:36:07 AM The only reasns you'd need a VTVM vice a digital multimeter is (a) peaking up a circuit for max or min (the digital display is hard to see a peak) and (b) for use in a high RF environment. Looking at a plate circuit with plenty of RF on it sometimes drives a digital MM a bit bonkers.
Again, you should be able to score an old buzzard VTVM at a hamfest for $5-10. 73 John Title: Re: test equipment: VTVM Post by: Ian VK3KRI on August 17, 2005, 07:59:54 PM Personally my AWA 'Voltohmyst' sits on an eyelevel shelf in the middle of the bench and never moves. For peaking tuning RF mesurment with an RF probe it is king! The Tek DMM I have gets used when I want higher accuracy (well probably higher resolution - not the same thing) or something portable. If I had to have only one , the portability of the DMM would win out. But you don't have to have only one - collect as meny as you need!
Ian VK3KRI Title: Re: test equipment: VTVM Post by: KB2WIG on August 18, 2005, 11:44:22 AM "The Tek DMM I have gets used when I want higher accuracy (well probably higher resolution - not the same thing) or something portable. If I had to have only one , the portability of the DMM would win out. VK3KRI " AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
you need Three.... if you only have one, how do you know if its correct? Two, now you dont know which one to trust.... need three for the best guess.... ask Vortex Joe, HE understands.......klc If the dvm can take the voltage, why not.... klc |