Jack, Check the meter with another meter and see if it is reading 1ma and is accurate enough. You can series up a DMM with the movement coil and a resistor of a few thousand ohms and put a 5V in to the whole series circuit to see if you're DMM and the meter movement under test is reading the same. If it is accurate and is indeed a 1 ma movement then just forget the parts in the meter (connect the movement direct to the terminals) and connect the meter to the external 5 meg resistor. In this lash up, the 5 meg resistor will supply 1ma to the meter, when there is 5KV present, and the meter will read 500.
Good Luck John, WA5BXO -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Jack Schmidling Sent: Monday, December 11, 2006 5:32 PM To: Discussion of AM Radio in the Amateur Service Subject: Re: [AMRadio] Component ID please John E. Coleman (ARS WA5BXO) wrote: >So perhaps the > other device was another resistor to adjust the value so that the meter is > more accurate than it was with just the one resistor. Well, the bands are black (background yellow) blue. Which would be 17 meg but it is also open and it is unlikely that both a comp res and a wirewound would be open. So I presume it is a cap and if you say one is not necessary, I will just replace the 500k and call it fixed. There is also a 5 meg from the hv to the meter. Thanks, js -- PHOTO OF THE WEEK: http://schmidling.com/pow.htm Astronomy, Beer, Cheese, Fiber,Gems, Sausage,Silver http://schmidling.com ______________________________________________________________ AMRadio mailing list List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net ______________________________________________________________ AMRadio mailing list List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:AMRadio@mailman.qth.net
