Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12) x

Thread Closed
Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

Calibrating a philco 7001 vtvm
#1

 The calibration steps for AC section calls for  setting function switch to 3v -10v-30v - 100v


 at each volts setting you are supposed to use an  sinusoidal RMS voltage at 5000 cycles.

 How do you get  5000 cycles for each voltage called for?

 What would you use to do produce that?  Thanks
#2

I realize this is an old thread, but I figured I'd reply.  I finished a 7001 restoration earlier this year that turned out great.

There's really no way to calibrate the AC ranges without an AC calibrator.  I picked up one of these on eBay a few years back that works well-

http://jtauser.com/radios/Fluke%205200A.jpg

It is a Fluke 5200A from the 70's.  It is good for the various frequencies required to calibrate vintage meters.  If you want to just calibrate the meter a 60 Hz using a variac and a good digital AC meter you'll find it won't be too far off.

BTW - if anyone else is doing one of these I painstakingly re-generated the meter scale and printed it on photo paper for my restoration.  I would be willing to barter for this image.

Joe T.




Users browsing this thread: 2 Guest(s)
[-]
Recent Posts
The list of my radio & TV collection!
Hello Peter, Thank you for posting that !! Sincerely Richardradiorich — 09:40 AM
Eico 232 VTVM Schematic
It's a microwave antenna. ?;-p?. I substituted 1N4002s off the 6.3 vac winding for the 1.5 volt battery. Uniprobe is the...RodB — 05:50 PM
Eico 232 VTVM Schematic
Try BAMA for a schematic. Looks like a replacement power source for the D battery has been installed. The tube may be...Chas — 04:51 PM
Eico 232 VTVM Schematic
Is that a battery holder?morzh — 04:43 PM
Eico 232 VTVM Schematic
A friend gave me this Eico 232 VTVM and I'm having trouble locating the schematic for it. This one seems to be a later v...RodB — 04:17 PM
Var resistor id
Considering what it is in series with, I doubt there should be any power requirements. Of course, we should know wher...morzh — 03:23 PM
Var resistor id
Trim pot, about 1/2 watt part of focus divider. As stated 2k ohms. This appears to be a rusty chassis, resolder all ...Chas — 03:19 PM
Var resistor id
Its a Sylvania 400 oscilloscope. here is a clip of r-100. Would be nice to know the current required. Not listed in part...Martinj — 02:10 PM
The list of my radio & TV collection!
Thanks Richard. I hope you enjoy it. Here I have created an English section on the history of radio with videos in Engl...RadioSvit — 10:23 AM
The list of my radio & TV collection!
Hello RadioSvit, first all happy new year ! I will watch your new videos this week. Sincerely Richardradiorich — 09:19 AM

[-]
Who's Online
There are currently 5636 online users. [Complete List]
» 1 Member(s) | 5635 Guest(s)
Avatar

>