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Test Equipment Anonymous (TEA) group therapy thread

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I am glad to see I was right when I purchased my 575 Tek curve tracer for 50% more than the seller advertised it for, and traveled 450kms and back to go get it... even though it turned out to be a Frankenstein unit with missing and broken bits that would need a lot of love. 150 Euros for it.

Given how rare and expensive these are getting, I thought I still preferred one that needs some work but is affordable, and well, having one at all really.

The future was to reward me well. Yesterday, another 575 just popped p here... yes, 15 months after I got mine. Would have it been worth the wait ?

Not really !

Look at that.... guy wants no less than 1,200 Euros for it !

Do you get a NOS one still in its crate for that price ? No, quite the opposite, you get for all the world what looks like your typical : "been sitting for the past 30 years on the dirt floor of grand pa's damp barn, with the mice and cats peeing on it "...

Plus, it's in Toulouse so even much farther than the 450kms I traveled for mine.

So yeah, I am extremely happy I worked the seller to get mine, and made the effort to do that horrible trip that my body said NO to, every second of the way. (I just can't travel long distances).

The little bits and bobs that need fixing on mine now feel so insignificant.... I am SO happy I bought mine and didn't wait for the next one !

So people... if you see some cool piece of vintage TE and your heart tells you to get it... then GET IT while you can !


--- Quote from: Neomys Sapiens on December 04, 2022, 04:06:21 pm ---Another set of adaptors fell into my hands - at 15€ I would be perfectly happy if there were 3 new ones in it. Counting those bridge connectors, I think this will be more than fulfilled as far as I can see from the pictures.

--- End quote ---

I'd say you got a deal, but I'd give them an extended visit to the Ultrasound bath before you use them though.


Neomys Sapiens:
A tale of two meters
which look quite similar at first, but are rather different in function. And it is not a happy tale, as I discovered several irregularities during this.
With the B1012 hybrid multimeter newly in, I thought it would be fun to compare it with the visually similar Multizet A1000, which is an electronic analogue meter with automatic 30<>100 range switching (which can be disabled). It uses the LCD display only to indicate the selected sub-range and polarity (or AC). Of course I also wanted to give them a checkout with the DMMcheck, which was overdue anyway for the A1000.

Here the results for the B1012:
DMMcheck          digital   analog   range   dBdig    dBana       
5VDC      5.00     48.5   (20V)
5VDC      05.0     0           (200V)
5VAC100Hz   4.99     48.5   (20V)   15.9        16
5VAC100Hz   04.9     0           (200V)
5VAC10kHz   4.88     48.0   (20V)   15.6        15
5VAC10kHz   04.8     0           (200V)

1mADC      1.00     0.8           (20mA)
1mADC      .998    99.0   (2mA)
1mAAC100Hz   .998     99.0   (2mA)
1mAAC100Hz   .99     0.7           (20mA)
1mAAC10kHz   .97     0.6           (20mA)
1mAAC10kHz   .995     98.5   (2mA)

100R      erratic erratic   (200R)
100R      .100     0.8           (2k)
1k              .998     98.5   (2k)
1k              1.00     0.8           (20k)
10k              10.00  99.0   (20k)
10k              0.98     0.7           (200k)
100k             100.1     99.0   (200k)
(1.5M)      1.514  150   (2M)
(1.5M)      1.43     10           (20M)

Si-Diode          .577     51.5
LEDred      1.509  149.5

Well, it is not spot-on thoughout, but the one thing calling for correction is the erratic reading in the lowest resistance range. Unfortunately, I got ZERO information on that beasty.

Next, the A1000. It is one of my favourite meters and therefore the rectification of it's problems will have a high priority. You can see it in the picture 'A1000_B1012_rdy_3' - there is a significant offset, which I got only so low by adjusting mechanical zero below true zero. So it will certainly need some work. At least I have the circuit diagram for it. Here are the readings:


5VDC      5.15           (10V)
5VAC100Hz   5.45           (10V)   
5VAC10kHz   5.5           (10V)   

1mADC      .95           (1mA)
1mAAC100Hz   12mA   (3mA)
1mAAC10kHz   10.5mA   (3mA)

100R           erratic   (300R)
1k              .955           (1k)
10k              .955           (10k)
100k              .955           (100k)

As I was on it, I checked the little pen meter SOAR 3100 also. The results are ok for this class of device:
5VDC      4.99
5VAC100Hz   5.11
5VAC10kHz   5.54

100R      108.1
1k              1002
10k              9.99
100k              100.0

Si-Diode f   ca. 150R
Si-Diode r   ca. 3.9M
(Beeper doesn't work for diode)

The picture which shows the A1000 and the B1012 operating side-by-side shows that the B1012 is reading low on the analogue in this range and that the offset on the a1000 is becoming less pronounced in the upper part of the scala. (Input was 8.05V AC 50Hz.)
And finally, I cracked the two Siemens meters open for a look at their construction. I will post additional details when I get to work on them.

Neomys Sapiens:
Sorry for the jumbled tables, but a tab doesn't work for me here.

If you format your tables to use a fixed width font, it will help a lot in making it more legible and easier for you to make things line up.


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