"Free Harbor Freight DMM"

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"Free Harbor Freight DMM"

Postby Jack Crow » 2018-Feb-Sun-16-Feb

Hi all,
Been lite on useful projects of late.
This is one I had wanted to do for a long time.

Make a meter holder for 'free' Harbor Freight meter.
Strictly for fun.

I used the HP 3456A as the background.

2-11-2018 007.JPG


2-11-2018 008.JPG


2-11-2018 009.JPG


Like I said, just for fun.

Jack Crow aka Radio Mike
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"Free Harbor Freight DMM"

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Re: "Free Harbor Freight DMM"

Postby Mooselake » 2018-Feb-Mon-13-Feb

They keep stuffing those in the bag on my rare HF (closest is 200 miles away :o ) trips, must have 3 or 4 of them. A while back I breadboarded a meter calibrator with a sample precision reference chip and tested all my DMMs. The HF was within a few hundredths of a volt at 5.000, good enough for Moose work

Kirk
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Re: "Free Harbor Freight DMM"

Postby Jack Crow » 2018-Feb-Mon-22-Feb

Kirk
They are not bad, just cheesy.
They have no mass, and tend to slide around on the bench.
The bracket will keep that from happening.
Snicked into the bracket, it is in there firmly.
If you want the STL's, let me know, happy to share with the team here.
There is a cup, pivot, and lower. The steel part is right out of the hardware store.

As you can tell, Im something of a DMM snob.
The HF meter, is the instrument we love to hate I suppose.

There are guys on the web modifying these things for LED back lights. Kinda cool.

The HP3456A is old.
That is why I got it for cheap.
It has not been to a lab in years.
Yet it's more than good enough for anything I am likely to do.
Systems DVM's are a bit different that what most people have on their benches.

Would be cool to make the hook up's and get the IEEE488 buss working.
Let's say you wanted to see just how stable a power supply was over a span of hours.
Such a set up can draw you a graph, min, max and other statistical measurements.
It can flip from accurate DC to very accurate True RMS AC measurements up to 1Mhz (most meters are rated at only power line frequency)
That info can be measured and extracted, depending on the program used.

Imagine making 100k measurements and using the computers power to give you an average.

I was calibrating them at the other end of the career when they were new.
For most things it is almost useless and cause people to go astray.
New users get what I call 'zero madness', like trying to make the thing display 15.0000 from a power supply that can't be adjusted that fine.
Most power supply's are not dc standards like a Fluke 335A or Fluke 5101.

It's fun, and good for male ego. Face it, male ego is very important when trying to impress others.

Or to steal a line from the former president of the galaxy...
Zaphod Beeblebrox once said.
“If there's anything more important than my ego around, I want it caught and shot now.”
or...
“If I ever meet myself,' said Zaphod, 'I'll hit myself so hard I won't know what's hit me."

Hope all is well in your part of the world.
WX here is up and down the dial. The day started in the 60's and I just froze walking the dogs tonight.

Keep it sane
Jack Crow aka radio Mike
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Re: "Free Harbor Freight DMM"

Postby Mooselake » 2018-Feb-Tue-15-Feb

Jack Crow wrote:WX here is up and down the dial. The day started in the 60's and I just froze walking the dogs tonight.

The last few days have been in the -0s to +10s range, today it's supposed to reach 34, and tomorrow 42.

After that brush with the answer to everything it's back into the 0s to teens range for a while longer. 235.6 inches of snow so far, although we get less than the official site so only 200 or so. The dog usually doesn't dally outside and wants right back in. He's on restricted activity after several very expensive shots for heartworms (the pound hound has become our most expensive dog) so I have to keep him on a leash and go outside with him. No open the door and let him out for the next month.

Mrs. Moose's off to Baltimore this weekend. While she claims it's to help with the due any day grandbaby I think it's an excuse to get away from the cold and snow.

Keep warm
Kirk
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Re: "Free Harbor Freight DMM"

Postby lairdb » 2018-Feb-Wed-13-Feb

Incidentally, I had a similar dimestore DMM that kept annoying me, and made a probe holder for it -- much happier.

Image

Image

Don't have it handy to take a real picture of, but FWIW.
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Re: "Free Harbor Freight DMM"

Postby Jack Crow » 2018-Feb-Wed-18-Feb

L
That is a good idea.
May make use of it.
Many thanks
Jack Crow
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