Author Topic: List your test equipment "scores" here!  (Read 482328 times)

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Offline Neomys Sapiens

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Re: List your test equipment "scores" here!
« Reply #2425 on: April 20, 2019, 02:49:06 am »
Ah. I think there is one in the box of plugins the fellow is sending me. No experience with it yet.
When I read the app note for it, it seemed very drawn by the hairs to me. I could not see where the real purpose of the thing is.
 

Offline 0culus

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Re: List your test equipment "scores" here!
« Reply #2426 on: April 20, 2019, 02:53:07 am »
I'll let you know what I find once I have one...in the meantime, just for grins I tried pushing the 7A19 and 7B15 a little. While the 7B15 is really intended to go with a 7B10 in a 7104 mcp CRT scope, it works quite nicely and I was able to get a stable trigger at 1.1 GHz. Beyond that the frequency response of the 7A19 (rated at 600 MHz) drops off precipitously to nothing.
 
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Offline Berni

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Re: List your test equipment "scores" here!
« Reply #2427 on: April 20, 2019, 08:11:14 am »
Now that is a pretty darn fast analog scope.
 
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Offline siggi

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Re: List your test equipment "scores" here!
« Reply #2428 on: April 20, 2019, 07:31:16 pm »
When I read the app note for it, it seemed very drawn by the hairs to me. I could not see where the real purpose of the thing is.
It's a differential amplifier with decent bandwidth and a nice common mode range. At 1mV/DIV it'll cope with +-10V common mode, which comes out to 10000 DIV common mode.
You can also used it as a single-ended input amp with a massive offset. You could e.g. look at a 3.3V rail with DC coupling at 1mV/DIV in 100MHz bandwidth.
You'd be able to see minute ripple, but also slow "DC" drift, which you wouldn't be able to see with AC coupling.
 

Offline Neomys Sapiens

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Re: List your test equipment "scores" here!
« Reply #2429 on: April 20, 2019, 07:37:18 pm »
When I read the app note for it, it seemed very drawn by the hairs to me. I could not see where the real purpose of the thing is.
It's a differential amplifier with decent bandwidth and a nice common mode range. At 1mV/DIV it'll cope with +-10V common mode, which comes out to 10000 DIV common mode.
You can also used it as a single-ended input amp with a massive offset. You could e.g. look at a 3.3V rail with DC coupling at 1mV/DIV in 100MHz bandwidth.
You'd be able to see minute ripple, but also slow "DC" drift, which you wouldn't be able to see with AC coupling.
So there is no threshold or switching involved - the 10-turns or digital adjustment is just for the offset?
 

Offline siggi

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Re: List your test equipment "scores" here!
« Reply #2430 on: April 20, 2019, 07:40:50 pm »
So there is no threshold or switching involved - the 10-turns or digital adjustment is just for the offset?

Yups - essentially you get to dial in a voltage and use it as input to either of the differential inputs, or you can both inputs for a differential measurement.
 
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Offline eemil84

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Re: List your test equipment "scores" here!
« Reply #2431 on: April 20, 2019, 08:52:09 pm »
I got this HP54645A Oscilloscope for 45 euros from our uni. Last calibrated in '09 but seems accurate enough.
Made in 1996 in USA. It has 2 channels, negazoom and a sharp CRT tube.
It was "Broken". I just needed to clean the keys and glue one pcb in and it worked like new. I modded an usb port to it(sorry)
And I got a Hameg 20Mhz analog scope for free. from the 80's. Made in West Germany. I opened it up and it was in top notch condition. Nothing has leaked or broken. German engineering!  :-+
CRTs are cool!
I don't have any professional education in this field, but I still manage to go on. I can't do any math.
 

Offline ArthurDent

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Re: List your test equipment "scores" here!
« Reply #2432 on: April 22, 2019, 03:06:23 pm »
This may not be a big score but I went to a ham fleamarket a couple of days ago. It was much smaller than I had hoped but there was one seller there who had, along with other goodies, several small SMPSs, most were new and still wrapped. I asked how much and he said $1 each so I just grabbed them all, not even checking their ratings. A lot of equipment uses small power supplies like this and sometimes it's easier to replace than to try to repair.

I was a little surprised when I opened one and saw the brand name. I'll have to check it out to see if it really meets specs!  8)
 
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Offline kj7e

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Re: List your test equipment "scores" here!
« Reply #2433 on: April 22, 2019, 03:19:44 pm »
This may not be a big score but I went to a ham fleamarket a couple of days ago. It was much smaller than I had hoped but there was one seller there who had, along with other goodies, several small SMPSs, most were new and still wrapped. I asked how much and he said $1 each so I just grabbed them all, not even checking their ratings. A lot of equipment uses small power supplies like this and sometimes it's easier to replace than to try to repair.

I was a little surprised when I opened one and saw the brand name. I'll have to check it out to see if it really meets specs!  8)

I bet it has tremendous specs and its really great!
 

Offline Neomys Sapiens

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Re: List your test equipment "scores" here!
« Reply #2434 on: April 22, 2019, 05:36:37 pm »
This may not be a big score but I went to a ham fleamarket a couple of days ago. It was much smaller than I had hoped but there was one seller there who had, along with other goodies, several small SMPSs, most were new and still wrapped. I asked how much and he said $1 each so I just grabbed them all, not even checking their ratings. A lot of equipment uses small power supplies like this and sometimes it's easier to replace than to try to repair.

I was a little surprised when I opened one and saw the brand name. I'll have to check it out to see if it really meets specs!  8)
Check twice. At least. And put the test records in a place where they can't reach them.
 

Offline bitseeker

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Re: List your test equipment "scores" here!
« Reply #2435 on: April 22, 2019, 06:18:35 pm »
Wow, that's a good source for lots of jokes. :-DD
I TEA.
 

Offline shakalnokturn

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Re: List your test equipment "scores" here!
« Reply #2436 on: April 23, 2019, 12:22:27 pm »
Americanized Wun Hung Lo.... :bullshit:
 
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Offline Neomys Sapiens

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Re: List your test equipment "scores" here!
« Reply #2437 on: April 23, 2019, 09:49:37 pm »
Americanized Wun Hung Lo.... :bullshit:
Should they ever go bust, they can reform under the name 'Wun Hung Hai'.
 
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Offline xrunner

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Re: List your test equipment "scores" here!
« Reply #2438 on: April 24, 2019, 03:09:02 am »
Trumpower?

Obviously way overrated for their performance.  :-DD
I am a Test Equipment Addict (TEA) - by virtue of this forum signature, I have now faced my addiction
 
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Offline mikron

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Re: List your test equipment "scores" here!
« Reply #2439 on: April 24, 2019, 05:05:56 am »
Adequate labelling on a part that is known for bloating and releasing an aggressive smear while heating up and losing its capacity...
 

Online beanflying

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Re: List your test equipment "scores" here!
« Reply #2440 on: April 24, 2019, 05:22:23 am »
Do the Caps release Orange smoke when placed under pressure and vent?
Coffee, Food, R/C and electronics nerd in no particular order :)
 

Offline mikron

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Re: List your test equipment "scores" here!
« Reply #2441 on: April 24, 2019, 07:09:30 am »
Trumpower?

Obviously way overrated for their performance.  :-DD


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.
 

Offline Neomys Sapiens

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Re: List your test equipment "scores" here!
« Reply #2442 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.

 

Offline shakalnokturn

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Re: List your test equipment "scores" here!
« Reply #2443 on: April 25, 2019, 08:28:38 am »
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.

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?
 

Offline Neomys Sapiens

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Re: List your test equipment "scores" here!
« Reply #2444 on: April 25, 2019, 09:58:53 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.

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?
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.
 

Offline MadTux

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Re: List your test equipment "scores" here!
« Reply #2445 on: April 26, 2019, 03:52:01 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).
I was referring to the 7A13 differential comparator plugin.
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.
 

Offline Neomys Sapiens

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Re: List your test equipment "scores" here!
« Reply #2446 on: April 26, 2019, 09:06:04 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).
I was referring to the 7A13 differential comparator plugin.
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.
It's clear to me now. I was mentally led astray by the designation as a comparator. So I expected it to act like a variable threshold input, the output of which would be a digital signal on the scope. Then I wondered why someone would want that.
 

Online blueskull

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Re: List your test equipment "scores" here!
« Reply #2447 on: April 27, 2019, 07:04:57 am »
My 6.5GHz VNA has arrived.

Here's what it sees on two pieces of 2" jumper wires (S12, SMA->BNC->wire antenna for both channels, 2cm apart).

 

Online med6753

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Re: List your test equipment "scores" here!
« Reply #2448 on: April 27, 2019, 09:33:39 am »
This has already been posted in the TEA thread but I guess I'll toss it in here too because it is a true "score"

Tek 7904 with 7A24, 7A26, and 2 - 7B80. All for $100 USD. Caveat is that the 7904 doesn't power up but it's the famous "tick-tick" of the switch mode supply trying to come up. Should be an easy fix.

An old gray beard with an attitude.
 
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Online rastro

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Re: List your test equipment "scores" here!
« Reply #2449 on: April 27, 2019, 02:14:46 pm »
This has already been posted in the TEA thread but I guess I'll toss it in here too because it is a true "score"

That is an extremely clean looking unit - must have been kept in a lab environment and well cared for. 
« Last Edit: April 27, 2019, 02:16:53 pm by rastro »
 


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