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Test Equipment Anonymous (TEA) group therapy thread

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Specmaster:

--- Quote from: Mr. Scram on May 15, 2018, 09:57:40 am ---
--- Quote from: Specmaster on May 15, 2018, 09:28:01 am ---I'm not at all sure that I'm understanding you with this one, the TF930 has a USB port but that is just another option for providing portable power, the TGP110 is purely 240v driven and neither of them has a GPIB connector, so in what way was you thinking of computer linking them?

--- End quote ---
The USB port is not just for power.  :) The TF930 is SCPI enabled, even though it uses a shorthand dialect. You can control all its functions through a PC.

--- End quote ---
So it is, should have RTM more thoroughly. :palm:
I probably skipped over that bit TBH seeing as I have no interest in using that feature although its nice to have the ability should I ever want too at a later date  :phew:

Cerebus:

--- Quote from: tggzzz on May 15, 2018, 09:48:54 am ---Having said that, I recently picked a Tek 115 up for £5, and that does one thing a pattern generator won't: have (independently) variable rise and fall times. Mind you, neither does that TTI.

--- End quote ---

I'll have to try and find some schematics for that. I had cause recently to design (read lash up) a pulse generator with variable symmetric rise and fall times; pretty easy really, a couple of adjustable constant current sources and a diff. pair as a current switch. What wasn't obvious was how to make the rise and fall times independently adjustable other than doubling up the former circuit and adding some switching diodes. I'll have to look and see if Tek had a cleaner solution.

Edited to add: Just downloaded the Tek 115 manual (with schematics) from W140. How to do it is head-slappingly obvious, once you've seen it - bet it took the original designer a few days to figure out though.

Specmaster:
Oh dear RS are struggling it seems, the saga with my 3478A rolls forwards. Despite the order tracking page of the web site showing it as been dispatched as of last Wednesday and it not arriving back as of Friday, I called them to be told that it was still in the lab and should be leaving Monday.

I need to pop out for a short time later today, so I thought I'd check with RS again to see what the latest state of play was. It now has completed the calibration and should be leaving today or tomorrow and I was told that the lab are saying that they are running a couple of days behind schedule due to the Bank Holiday, so 1 days holiday adds 2 days onto their turnaround time?

So it now looks like its going to be 2 full weeks from collection to return on what was claimed to be a 5 day service?

bd139:

--- Quote from: Cerebus on May 15, 2018, 10:20:17 am ---
--- Quote from: tggzzz on May 15, 2018, 09:48:54 am ---Having said that, I recently picked a Tek 115 up for £5, and that does one thing a pattern generator won't: have (independently) variable rise and fall times. Mind you, neither does that TTI.

--- End quote ---

I'll have to try and find some schematics for that. I had cause recently to design (read lash up) a pulse generator with variable symmetric rise and fall times; pretty easy really, a couple of adjustable constant current sources and a diff. pair as a current switch. What wasn't obvious was how to make the rise and fall times independently adjustable other than doubling up the former circuit and adding some switching diodes. I'll have to look and see if Tek had a cleaner solution.

--- End quote ---

Damped miller integrator? I built one of them a few years ago to get adjustable rise time. If you stuff a small cap across B-C junction with a (trimmer in my case) resistor in series with it. Doesn't affect bias yet slows the transistor down.



--- Quote from: Specmaster on May 15, 2018, 10:24:46 am ---Oh dear RS are struggling it seems, the saga with my 3478A rolls forwards. Despite the order tracking page of the web site showing it as been dispatched as of last Wednesday and it not arriving back as of Friday, I called them to be told that it was still in the lab and should be leaving Monday.

I need to pop out for a short time later today, so I thought I'd check with RS again to see what the latest state of play was. It now has completed the calibration and should be leaving today or tomorrow and I was told that the lab are saying that they are running a couple of days behind schedule due to the Bank Holiday, so 1 days holiday adds 2 days onto their turnaround time?

So it now looks like its going to be 2 full weeks from collection to return on what was claimed to be a 5 day service?

--- End quote ---


Mr. Scram:

--- Quote from: Specmaster on May 15, 2018, 10:15:31 am ---So it is, should have RTM more thoroughly. :palm:
I probably skipped over that bit TBH seeing as I have no interest in using that feature although its nice to have the ability should I ever want too at a later date  :phew:

--- End quote ---
It's part of why I bought it and I just tested the feature last week. I'm hooking everything up, so you can build fairly nifty and convoluted automated test setups.

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