Dick, Here's the link to the probe fix. If you have a good probe with your heathkit, then use it. You can also make one if so inclined and are the industrious sort. Also, I think B&K made a similar probe with the resistor installed and you could switch it in and out at or near the probe tip. Don't remember for sure. I have one with the original probe, calibrated, and one with the probe fix installed. It is also calibrated. Both work and read identical. I suppose there are cases where the probe fix may cause the meter to read wrong, but I have not found any in normal shop work. I believe mine does use the old style phone plug that heathkit sold with the unit new. As I recall it does have additional insulation between tip and sleeve, so that may be an issue to consider. My Flukes and Simpson gets the most use here but the heathkit VTVM is used often when I have an old receiver to align.
http://www.theheathkitshop.com/vtvmprobefix.html Good luck, David Wd9cmd ----- Original Message ----- From: Donley To: drakelist@zerobeat.net Sent: Thursday, July 17, 2008 12:13 PM Subject: Re: [drakelist] DMM recommendation I would be interested in seeing what info you have on the probe changes. Dick ----- Original Message ----- From: David & Chris Drake To: drakelist@zerobeat.net Sent: Thursday, July 17, 2008 9:44 AM Subject: Re: [drakelist] DMM recommendation FYI to the group I too have a heath VTVM that I use frequently for receiver alignment and other uses. The probe is rarely included when you find one of the many versions (cosmetically) of pretty much the same design. The probe designed for these VTVM's is not necessary. The best thing to do is modify the input circuit, very simple to do. Then when the main switch is turned from AC to DC to Ohms, you have the correct input impedance and blocking. It makes the Heath as easy to use as the Simpson 260/270 series. You simply buy a set of standard probes and a stereo 1/4 phone plug and wire the two leads to it. I have the information here somewhere and can supply to anyone who wants. Its also available on the internet. David wd9cmd ----- Original Message ----- From: [EMAIL PROTECTED] To: drakelist@zerobeat.net Sent: Thursday, July 17, 2008 9:07 AM Subject: Re: [drakelist] DMM recommendation [EMAIL PROTECTED] writes: You might want to keep your eyes open for one of the Heath VTVMs Hi Garey, And somewhere on the internet was rebuilding instructions (or have it done) for the probes I believe I found the article somehow through the drakelist. Carl WD8NHK -------------------------------------------------------------------------- Get the scoop on last night's hottest shows and the live music scene in your area - Check out TourTracker.com!
