Digital Multimeters

Because the comma is either to the left, right, or neither, making it simple to group the characters. I find groups of five more easy to remember but no one asked.

We do use separators for all of the above. A space is usually used between groups. Binary is often in groups of eight, octal in groups of three (PDP-11 switch registers), and hex numbers more often in groups of four.

Because we don't use bases even as high as 32. The characters are too hard to remember. In grade school we were taught to do arithmetic (including long division) in all bases up to 32. Bases above 16, or so, were a RPITA. The tables got too big to remember.

That one is obvious, too. There is only one reason to put the most common characters under the weakest and least independent fingers.

5 digit grouping is used by the hindi system "xx,xxx,xx,xxx,xx,xxx" it seems that the grouping by fives was lost in transaltion somewhere.

it depends on the number. eg: UUID , mac address, ip address.

OTOH most compilers want bare numbers for all numeric bases.

It was easier than adding new glyphs to the keyboard or typing two glyphs per digit.

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We've been using hash marks in groups of 5 for a long time. So, why did we break tradition by counting zeros in groups of 3 instead, and then only to the right of the decimal point? Become part of the problem. Make your mark on the world (pun intended) and write big numbers with the comma every 5 digits instead of three.

Also add the IFS problem:

Is that because they're not smart enough to simply drop all the extra commas? Most can strip out the comments, so why can't they clean up floating point numbers instead of choking on the commas?

I don't see a problem. The lack of characters didn't stop the authors of APL from inventing their own symbology:

The PC keyboard is full of special characters. The problem isn't adding them, but rather finding them. If you have a Windoze machine handy, go to the DOS shell prompt and run "OSK" for the On Screen Keyboard. For later Windoze versions: Looks like you're running some Linux mutation: There are plenty of programmers calculators, so why not a programmers keyboard? Just roll your own: If that's too much, just make a custom keyboard for your favorite language, radix, or action game: No more excuses about the lack of available symbols or glyphs. If the world is moving towards icons and other forms of hieroglyphics, then it can also go back further and plagiarize the glyphs found on the walls of prehistoric caves for character and numeric symbols.

Hmmm... maybe emoji symbols and keyboard?

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He did say "smarter than rats", not intelligent. If you want to help with squirrel problems, get a few cats. Best if they are outdoor cats. I have indoor/outdoor cats and every once in a while a squirrel is left in front o f the door. Mostly the squirrels stay in the trees.

Rick C.

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h squirrel problems, get a few cats. Best if they are outdoor cats. I hav e indoor/outdoor cats and every once in a while a squirrel is left in front of the door. Mostly the squirrels stay in the trees.

Ha! Stoopid cat. That squirrel was just playing with it and could have been away and gone anytime if it'd wanted to. :-D

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PS3 This weekend also did change the planes display for xgpspc for ',' and for metric / imperial units:

n the basement or some where else and looked at what is available on Aliexp ress. Lots of choices. Dan

I gave up on finding some of the information on DMM's. And ordered a Bside ADM20 for $ 32. Never could find anything on using the usb port and also h ow often the bar graph updates. It seems to have reasonably adequate featu res and was the cheapest DMM that I found that has a bar graph display in a ddition to the digital display.

I ordered it off Aliexpress which was a good bit cheaper than Ebay. Will p ost about how the usb port works if I ever find out how it works.

Dan

All but indispensable, auto turn off. May sound strange, but I have a 200 euro + DVM, whose battery has run out, every time I want to use it.

Groetjes Albert

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Albert van der Horst, UTRECHT,THE NETHERLANDS 
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I fitted a lipo in mine... lasts 'forever'

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And make sure it is a *real* "auto off". I have one that advertises that feature, and when you leave it on, after a time-out the display does go blank, but it uses nearly as much power in this state. It is worse than no auto-off because the first couple of times I looked at the screen, assumed it was off, and ruined a battery.

On Sunday, December 23, 2018 at 1:32:31 PM UTC-5, Albert van der Horst wrot e:

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without knowing any of your requirements other than auto shutoff... I'd suggest Fluke DMM's. Bit on the pricey side but having to second guess what the meter is telling you or having a 'fragile' meter is not worth the aggravation when you need it. I have put them through hell both on a bench and in the field (some downright nasty environments) and they always work correctly.

As a second (less expensive) meter, I like Extech, the new(er) EX330 has a lot of nice features for the price (about $40-50 USD) I personally do have a negative bias to things sold by Alibaba. YMMV. J

Another nice feature is a snap-open battery compartment. My Flukes need to be completely disassembled with a screwdriver to replace the battery.

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OK I have 4 Excel DT9025A multimeters from ebay. for the price of 7$50 each. Am very happy with these meters, and those came inclusive battery, so when a battery was empty I just took the next meter,,, Then one day I had to buy a new battery. But this discussion made me curious, and why filosphy if you can MEASURE things I thought. So I took one of the Excel, and my Sunwa battery free analog meter, and put it in series with the excel battery, waiting for the 'auto power off' on the excel to happen. Current was just over 2.5 mA when on. Waited waited waited waited, 15 minutes and I lost patience and stopped the experiment. Then Eureka: Auto power off is implemented in these meters by way of battery exhaustion! :-)

Link

So long as it doesn't open up while you're using it on some high voltage.

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I wouldn't do that; would you?

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Yup. There's nothing like a Universal Avometer 8 Mk IV. The Simpson

260 is reasonably close.

For bench meters I have a couple of HP 3456As (6.5 digit), a Keithley

177 microvolt DMM (4.5 digit), and a stack of Keithley 191s (5.5 digit).

For handheld DMMs I've standardized on the Tektronix DMM 916, widely available used or NOS. I just picked up a NOS one with the carrying case and probes for $146 on eBay. I also have a Fluke 87 from 30 years ago and a BK Precision 2809B (6000-count).

For knock-around ones with decent accuracy, e.g. for the tool bag I take on field installs, I have some much smaller 3-1/2 digit Chinese ones that Dave Jones liked--they're less than a quarter of the size of the Teks, but their front panel is mostly display.

Cheers

Phil Hobbs

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Extech makes good stuff. Some of their cheapish DVMs have a thermocouple input connector too.

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John Larkin   Highland Technology, Inc   trk 

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http://www.highlandtechnology.com