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Jeff, some advice from a recovering calibrataholic. It is good to know how to calibrate instruments, know their tolerances and how much you can trust what is displayed. However, in the quest for ever

Yes, weak coupling of the oscillator under test to a small nearby antenna connected to a sensitive receiver is the way to tune those touchy circuits. The receiver can be calibrated to WWV on 10MHz and

The one Goldmine sells is +/- 75mV so that is why the cost is so low. -- Dave, AA6RE

Voltage references and calibration techniques for the home lab: See: http://ve2azx.net/technical/CalTechniquesfortheHomeLab-2-Compressed.pdf Jacques?? VE2AZX

Those are expensive for how frequently you'll use one of them. No wait, they're just plain expensive. Also, lead time may be expensive. And yes, of course I have one! 73 Jim N6OTQ

I also have the dmmplus … very pleased with it. 73, Frank K4FMH --- Frank M. Howell, PhD Ridgeland, MS frankmhowell (at) hotmail.com ---

I do not maintain any references to check my instruments and test equipment.. I have multiple quality variable power supplies and a number of GR L, C, and R decades plus a couple of GR L and C

Jeff, that's a how long is a piece of string type question. But it's still a good one. How accurate a reference needs to be rather depends on the purpose to which the DVMs which might be checked

Check this out as this should be all you need for regular multimeters. https://dmmcheckplus.com/ | | | | | | | | | | | DMMCheck Plus Calibration made simple. | | |

Hello Jeff, I understood "bumble bee" capacitors to be a style of capacitor made by Mullard, certain values have colours which are similar to? those of a bumble bee. I see them on ebay advertised as

To be clear, don’t waste your time testing these capacitors, just replace them. 73 (Regards). Max K 4 O D S. I've Never Lost the Wonder. Sent: Saturday, December 03, 2022 11:15 PM To:

A general rule among those of us who restore old electronics equipment to working order is "Don’t waste your time testing wax coated and bumble bee capacitors.” A bumble bee capacitor has color

Hi Jeff, I would be very careful doing this. Its a good reason the charger would not power the meter, and that is isolation for safety. If you try this, you need an isolated power supply, that can

My only concern would be isolation... Some of those small wall warts are mighty cheap... You mentioned a DVM, if you were measuring several hundred volts w/ a DVM, I don't know how much I would trust

I used to supervise a service team of 14 guys and other things. Carlson would not have been one.? Servicing is about probability, experience and logical inference but it all needs to be based on

I found the schematic for Carlson's tester on the "not-so-dark web". It appears that all it really does is compare the test cap to a 66M resistor (three 22M in series), using a couple of 2N3904's

LOn Wed, 30 Nov 2022 at 02:29, saipan59 (Pete) <saipan1959@...> wrote: Agilent made a couple of high resistance meters. The 4349A has 1, 2 or 4 channels, depending upon the options installed,

BTW, one of the worst ones of this bunch was equivalent to a 6M resistor (tested at 300V, cap rated for 400V). Pete

Just tried a few. Using an HP power supply that does 0-320V, with the current limit set low, and a Simpson 260 VOM on the 50V or 10V scale. Seems to work well. Here's a pic - good on the left, bad on

Thanks for the comments/links so far. The "Mr. Carlson" stuff: I watched his very 'wordy' video, where he repeatedly says how awesome his tester is, how carefully he has tested his design, and he