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mikron:

--- Quote from: xrunner on April 24, 2019, 03:09:02 am ---Trumpower?

Obviously way overrated for their performance.  :-DD

--- End quote ---


If that unit does not perform up to spec and the parts surrounding the big guy overheat and need to be replaced all the time, it may be due to bad design. Better replace it before it causes too much trouble. Good alternatives are readily available.
Whatever you do: Don't forget to discharge that fat "Trumpower" component before you touch it. Otherwise it might kill you.

Neomys Sapiens:
Cannot keep those multimeters from multiplying!
Aquired a Gossen Mavo30 for a shabby 25.50€. If it works, it will be submitted for calibration with the next batch of company gear. ;D
I will then tell more about it under the 'show your multimeter' thread.

shakalnokturn:

--- Quote from: Neomys Sapiens on April 24, 2019, 11:57:25 pm ---Cannot keep those multimeters from multiplying!
Aquired a Gossen Mavo30 for a shabby 25.50€. If it works, it will be submitted for calibration with the next batch of company gear. ;D
I will then tell more about it under the 'show your multimeter' thread.

--- End quote ---

Nice! Correct me if I'm wrong but I think there are at least 2 rebrands of this model, one being Siemens, the other I have lost for now.
Who actually designed these?

Neomys Sapiens:

--- Quote from: shakalnokturn on April 25, 2019, 08:28:38 am ---
--- Quote from: Neomys Sapiens on April 24, 2019, 11:57:25 pm ---Cannot keep those multimeters from multiplying!
Aquired a Gossen Mavo30 for a shabby 25.50€. If it works, it will be submitted for calibration with the next batch of company gear. ;D
I will then tell more about it under the 'show your multimeter' thread.

--- End quote ---

Nice! Correct me if I'm wrong but I think there are at least 2 rebrands of this model, one being Siemens, the other I have lost for now.
Who actually designed these?

--- End quote ---
The third brand is Norma from Vienna/Austria. There it was called Normameter MP13, while it 's lesser siblings were the MP11/MP12 and the top model MP14. At Siemens, it was the B1022 (and 1020/1021/1024). At least I think now that the Mavo30 equates to the MP13. I'm really after the B1024 due to a unique feature. But I am not sure yet.
Should that be the case, I have already a taker.
Who actually designed those is a bit puzzling.
The earlier line of Siemens handheld digital multimeters also had their Norma equivalents. The Norma which is equivalent to the B1010 (with phase rotation, min/max, type K temperature and 30A) is called D1218. I wrote about it in the 'show your multimeter' thread. Interestingly, there is NO Norma version of the ingenious analogue Multizet A1000 (same post). Also, the earlier class 1 Siemens instruments (Multizet S, T, etc) are not found in Norma guise. The earlier Siemens VMG3eff is the Norma digEff. It is a RMS capable multimeter (among the very first) looking like a miniature desk multimeter. The battery pack is exchangeable for a mains power module.
The Siemens VMG1 analogue mm is the equivalent to the 'Normatest' (queer simple/passive meter oriented sideways, but with an interesting lock for the instrument).
Same holds true for the Siemens desk multimeters up to the 5.5digit, IEC bus model with VF display.
Now it gets even more strange: where high quality analogue instruments are concerned, Norma obviously cooperated with Metrawatt. There are Norma versions of the large Unigor instrument, but here a Unigor 3N is a Unigor 3N.  There has to be a connection with Goerz (of Goerz Metrawatt) also being in Vienna.
Now to make it completely unresolvable, earlier on there were instruments which appear both under the Goerz brand and under Hartmann&Braun designations. Later H&B instruments are not seen under any other name.
 :scared:  :-//
So, I can't tell you but I am interested very much myself in the question who of the geman speaking area multimeter brands/manufacturers was in bed with whom at which time.

MadTux:

--- Quote from: Neomys Sapiens on April 20, 2019, 02:34:26 am ---
--- Quote from: 0culus on April 19, 2019, 11:02:00 pm ---Which one are you talking about? Among the other plugins I'm going to be getting is another 7A26 dual trace amplifier. The 7A19 is a 600 MHz 50 ohm amplifier designed for reaching the rated bandwidth of the 7904A (500 MHz).

--- End quote ---
I was referring to the 7A13 differential comparator plugin.

--- End quote ---
New LED display version of 7A13 is one of the best general purpose plugins for 7000 scopes. Has often dodgy relays inside that are difficult to replace, however.
 It's like a 4digit DVM coupled with scope display, if one side of the differential amplifier is fed from internal voltage source with LED display. Great for checking power rails.
Or it can be used as a differential amplifier with both probes connected to DUT. Great to measure things like current or some signal with large voltage offset.

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