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Best handheld dmm, at any price?
glarsson:
Highly suspect. It should work when the probes are shorted, but the meters will influence each other when the probes are open. Just look at the Fluke. When the other meters show overflow the Fluke shows numbers. This means that the starting state of the meters are different and that the time until the meters show "0" might be different than what it would be without meters connected together.
Fungus:
--- Quote from: glarsson on April 18, 2018, 08:57:42 am ---Highly suspect. It should work when the probes are shorted, but the meters will influence each other when the probes are open. Just look at the Fluke. When the other meters show overflow the Fluke shows numbers. This means that the starting state of the meters are different and that the time until the meters show "0" might be different than what it would be without meters connected together.
--- End quote ---
On the plus side: The Fluke is showing megaohms, which I assume is the highest range. It's not starting out in the middle.
--- Quote from: bd139 on April 18, 2018, 08:56:13 am ---Just to back up how bad this can get, here are two meters measuring the same resistor. The GDM-8341 is spot on and does not change if the Keysight one is connected or not. Resistor is a 1k 1/4W 5% carbon film jobby
--- End quote ---
It obviously won't work for a 1k resistor. The best we can hope for is that all the meters will drop down to their bottom range when the leads are shorted.
It looks like that's what's happening but by luck, not design.
niner_007:
It doesn't exists, they kinda all have issues, limitations or are disappointing one way or another :) There's little innovation as well. I have a few 87Vs and a 289. My definition of best:
- dual (at least) or quad inputs, measuring voltage, current etc simultaneously and independently (displaying them too)
- small profile, the 289 is too big, the 87V is too big! there is a lot of space in the 87V that can be used better
- logging built in, multimeters without some form of logging are useless; with both external and internal logging, with a lot of internal memory
- simple and intuitive interface, no more dials, and much better interface than the 289
- rechargeable cells with built in charger, 18650 cells please!
- external connectivity, USB mass storage (SD card is less desirable), but no optical please! this is not the 80s
- a form of wireless connectivity (mandatory): Wi-Fi, ZigBee or LoRa; if Wi-Fi, it needs to be secure, things like the ESP8266 are not acceptable for this; no Bluetooth please
- a form of wired connectivity, Ethernet (isolated) would be the best, USB, less so
- easy user calibration
- fast updates, 10ksps at least
- 200,000 counts at least
- no ASICs or multimeter ICs, should only use off the shelf discrete parts!
- should use a large display, it really doesn't need a lot of buttons with a menu system; it should use a knob, kind of like dial, but smaller, with an optical encoder, for navigating the menu system
Fungus:
--- Quote from: niner_007 on May 19, 2018, 07:58:21 am ---My definition of best:
...
--- End quote ---
Sounds awful. :--
Electro Detective:
--- Quote from: Fungus on May 19, 2018, 08:39:06 am ---
--- Quote from: niner_007 on May 19, 2018, 07:58:21 am ---My definition of best:
...
--- End quote ---
Sounds awful. :--
--- End quote ---
He forgot to include the mega dollar wireless to wireless calibrator to ensure the meter is behaving at all times
and internet connectivity to download and install 24/7 firmware updates (morning, brunch, lunch, dinner, dessert, cigarette, and night time builds) for the meter and calibrator
till the money runs out and it's Ebay flogging time.. before a new model gets released and no one wants the last buggy model with OLED crappery :-[
;D
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