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Test Equipment Anonymous (TEA) group therapy thread

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capt bullshot:

--- Quote from: nfmax on June 25, 2022, 08:09:26 am ---
A special bonus point to the first person to correctly describe what purpose D1 serves

--- End quote ---

I can figure two purposes:
1. help with measuring the quiescent current of parts of the circuit, since you've attached a test point
2. when U1 pin 9 switches, the common R1, R2, C2 node sees voltages below BATT- and above BATT+, the diode will allow the supply voltage of U1 to rise above BATT+ and the stored energy of C2 will be used to supply U1 for some time, reducing the influence of R1 to the timing.

BU508A:

--- Quote from: mansaxel on June 25, 2022, 07:00:53 am ---A request to go against the spirit of the group:

At work, we've established that we need a Timing Interval Analyser. I tried buying the one Robert had for sale, but was too late. Does anyone else have a hp 5371A or one of the Yokogawa TA series, or similar, they'd be willing to part with?

It needs to be reasonably well working (another break with the spirit) and it can cost some money (again, against the very moral fibre!) but not "Korea instrument reseller insane".  An official-looking invoice is a cool thing.  In Europe is a definite bonus.

Ice-Tea?

--- End quote ---

There is one in German ebay Kleinanzeigen since quite some time, waiting for someone to buy it (NAWTS).
Price tag: 400 Euro
https://www.ebay-kleinanzeigen.de/s-anzeige/yokogawa-jittermeter-time-interval-analyzer-ta320/1339444881-168-8416


Edit:
just saw the response from the Captain.

--- Quote from: capt bullshot on June 25, 2022, 07:49:46 am ---This guy:
https://messgeraete-markt.de/

A well known seller of TEA (at least for some of the German members of the TEA party), has some of the Yokogawa TA series (320, 520, 720) in his stock.
IMO, he can meet all your criteria.

He's also got an ebay shop, and his stock definitely is larger than what is shown at the website and ebay listings. So just contact him (Mr. Knopf) and ask what he's got for you.

--- End quote ---

I second that. Messgeräte Markt from Düsseldorf (Knopf HiFi) is a very reputable and good seller for test equipment. If you can get an instrument from him, which will fit your requirements, go for it.

Edit 2:
Link to the ebay shop with the listings of the Yokogawa Time Interval Analyzers.

NAWTS, too

tautech:

--- Quote from: tautech on June 24, 2022, 08:38:20 pm ---Back to chainsawing today after getting rained out yesterday.  :horse:
Still, it was nice to swing on my big bertha chainsaw which hadn't been used in anger for a couple of years and now the 5' tree is down it can go back into stowage until needed again....big heavy brute of a thing.
I'll get a pic later....

--- End quote ---
Well they say the plans of mice and men can go astray and today they did .....
Got the pic I promised but #2 saw (the real workhorse) didn't wanna play and cost me several hours fixing the darn thing.  :horse:

These run a CDI with a LV feed to a secondary HT coil near the cylinder and this LV lead resonates in the last 25mm although they are routed and fixed in clips and grooves on route to the HT coil. This last 25mm a known failure point yet it's the first I've ever had fail and at both ends where it terminates into a 3mm push on crimp terminal.
Just thank my lucky stars I have 3 of these units in various states of repair for one to donate the necessary bits for a fix.  :phew:
Groundhog day tomorrow !  :horse:

Anyways a pic of 120cc Bertha sporting a 3 foot bar.

tggzzz:

--- Quote from: nfmax on June 25, 2022, 08:09:26 am ---A special bonus point to the first person to correctly describe what purpose D1 serves

--- End quote ---

I wish all schematics were as well laid out and informative as that!

I guess D1 prevents SCR latchup when there's no battery and the voltage across C1 decays.

bd139:
Oh I did it again.  Bought a Tek 465B  :-DD

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