Products > Test Equipment
SIEMENS B1023 (NORMAMETER MP14) from 1987 - Pictures, Teardown, Impressions
Cymaphore:
After careful examination of the images of the seller, it indeed looks like the ENERDIS MT devices he offers are actually unused stock items. It looks like the leads are still in original packaging, the plastic doesn't even look wrinkled. No scratch, no dust, no dirt visible on the devices at all. And that for sub 100€. Wow.
I think we are looking at the last remains of a failed attempt to enter the french market. It seems likely, that only a few of these ENERDIS MT have even been produced, considering there is absolutely no information about them anywhere to be found at all.
It's not entirely unlikely that you are the sole owner of the single still existing ENERDIS MT14 on the planet, or at least one of very few. Congratulations :-)
Neomys Sapiens:
--- Quote from: Cymaphore on July 26, 2021, 07:42:24 am ---
--- Quote from: shakalnokturn on July 26, 2021, 12:47:48 am ---Thanks for the teardown.
I own a meter that seems to be a rebrand of yours under the name of Enerdis MT14, bought used for about 85€ shipped.
I haven't checked if it is a true RMS model as yours seems to be.
The French edition of the user manual doesn't have the schematic.
--- End quote ---
Thank you for the information! I just updated my original post to include a brand table at the bottom based on what I could find out so far, maybe interesting for someone.
Your device looks like brand new, it must have been sitting in storage unused, wow. Based on the buttons and the manual headline, it's a branded MP14. True RMS is not present on my unit as well, they added it in the successor products (where they also replaced the leather holster/case by a fluke-style soft silicone holster).
If you ever get the chance to open the back cover, I would love to see some pictures of the inside, the stickers on the PCB could provide more clues about the history of this line of devices. Maybe you got a "mp14/07" label with a serial number on it as well, seemingly not all units have it (or it got lost in some of them) based on the few pictures found online.
I'll try to make a high quality scan of the schematic next time I have access to a decent scanner.
--- End quote ---
According to my information (old Siemens catalogue and Manual) as well from the brochure when I was offered it in the late 80s, at least all 1022/1023 are TRMS measuring, whether marked so or not.
And your teardown pics support this! See my edited picture. One of your pictures show it from above too.
@shakalnokturn: why do you think that yours is not, as it is explicitly marked so?
Cymaphore:
--- Quote from: Neomys Sapiens on July 27, 2021, 03:57:02 am ---According to my information (old Siemens catalogue and Manual) as well from the brochure when I was offered it in the late 80s, at least all 1022/1023 are TRMS measuring, whether marked so or not.
And your teardown pics support this! See my edited picture. One of your pictures show it from above too.
@shakalnokturn: why do you think that yours is not, as it is explicitly marked so?
--- End quote ---
You are absolutely right, that component is in fact labeled "AD636JH 8825(delta)". So that's why it takes a bit more time to provide the first numeric voltage reading in ACV :-)
So it is True-RMS after all! Thanks for correcting me.
shakalnokturn:
--- Quote from: Neomys Sapiens on July 27, 2021, 03:57:02 am ---@shakalnokturn: why do you think that yours is not, as it is explicitly marked so?
--- End quote ---
I'm probably confused, will just have to open the meter to check.
I seem to remember reading something somewhere (or maybe just photos) that mentioned a difference between the meters marked RMS and those marked TRMS.
Edit:
Likely this page got me confused: https://sigrok.org/wiki/Norma_DM950
TimFox:
Hewlett-Packard was careful on their AC voltmeters that were not “true rms” to print “average responding” on the meter face. Technically, that meant measuring the average of the absolute value, with the meter calibrated to show the rms value of a sine wave with that average value.
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