Re: [volt-nuts] Cropico DO4A Digital Ohmmeter

29 04:35 PM, Bob Albert via volt-nuts wrote:  I have a few very low resistance resistors (around 50 milliohms), four terminal of course, rated at .05% or maybe better.  I built a low resistance Ohmmeter but don't use it since I got my HP3456A with very good resolution.  I can measure the resistance

Re: [volt-nuts] Cropico DO4A Digital Ohmmeter

I have a few very low resistance resistors (around 50 milliohms), four terminal of course, rated at .05% or maybe better.  I built a low resistance Ohmmeter but don't use it since I got my HP3456A with very good resolution.  I can measure the resistance of a screwdriver shaft with it, although

Re: [volt-nuts] How can I make a 2000 V DC meter with an input resistance of at least 100 T ohms?

I found several electrostatic voltmeters on ebay.  The brand I remember is Sensitive Research. Bob On Thursday, March 22, 2018, 6:00:39 PM PDT, Bob Albert via volt-nuts <volt-nuts@febo.com> wrote: What about an electrostatic voltmeter?  Those have been around for decades an

Re: [volt-nuts] How can I make a 2000 V DC meter with an input resistance of at least 100 T ohms?

What about an electrostatic voltmeter?  Those have been around for decades and draw zero static current.  You didn't indicate how accurate your measurement needs to be. I am trying to recall the maker of the unit, I think ESI but not sure. They were somewhat popular in the 1950s as I  recall

Re: [volt-nuts] Redrafted schematic of Fluke 732A reference circuit

I can't seem to make the link work. Bob On Sunday, January 21, 2018, 9:49:32 AM PST, David C. Partridge wrote: Darn the URL got split: Dave -Original

Re: [volt-nuts] Retiring collection of 6/7 dial bridges

What is the HF impedance bridge? Bob On Saturday, April 9, 2016 9:34 PM, Demian Martin wrote: I have a number of precision bridges and the like that I really need to move on to a new home. Is there anyone local to me who is interested? JRL KV bridge Fluke Lead

Re: [volt-nuts] Excellent economical voltage standard

You can buy rather cheaply an IC that delivers rather accurate voltages.  I have several of them switch selectable and check my voltmeters from time to time.  They differ slightly from one another but when you average them you can get pretty close. Not the best way, but it works for me and

Re: [volt-nuts] Could you fall an HP 4-wire LCR meter into thinking you have a negative resistor?

You can do a similar thing by connecting the measuring leads 'outside' the current source leads or reversing the measuring leads.  It's not a valid measurement, just the same as putting a signal into one pair of leads without connecting the other.  The instrument isn't measuring resistance;