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Tektronix TDS 1012 - TPOS 1012 ?

Discussion in 'Electronic Design' started by Eeyore, Mar 1, 2007.

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  1. Eeyore

    Eeyore Guest

    I had the misfortune today to have to use a TDS 1012 !

    For the sake of my sanity I won't go into the exactly gory details but amongst
    my irritation with it was the way I simply couln't get tit to display anything
    remotely like a usable trace. I was just looking for some lowish level audio
    band noise btw (actually line frequency hum).

    In the end I was able to press into service an ancient Telequipment D67

    which finally gave me a trace I could do something useful with.

    My primary probem in attempting to view the noise I was looking for was that the
    Tek was triggering on and displaying vast quantites (~1.5V) of ~ 48kHz.

    I eventually discovered that simply turning on the TPOS (total piece of shit)
    1012 swamped the trace on the Telequipment too !

    Ye Gods ! What one earth possesed them to make such a time wasting, RFI
    radiating godawful pile of crap ?


    p.s. don't even get me started on trying to use Ch1 and Ch2 in difference mode
    either. Also please don't mention 'menus' ! Sheesh ! Now if I'd had my 465
  2. Joerg

    Joerg Guest

    Ah, yes! Got a Telequipment D66 here but the input attenuator croaked.
    Do you know whether there are schematics on the web for these? Were they
    made in the UK?

    This old D66 has served me quite well for low frequency stuff.

    I had hard EMI from a TDS220 last week. Had to turn it off as well.
    Don't ever, ever ditch your "old" analog scopes. They are still the best.
  3. john jardine

    john jardine Guest


    Yes, UK.
    The PDF is 5Mbyte. Send?.
  4. Joerg

    Joerg Guest

    Yes, that would be great. It would make it easier to repair the divider
    and most of all, align it afterwards. It's a scope from yesteryear but
    it has been good to me. I might give it to a school but only when I got
    it back to full functionality.

    The shortest email address I have:

    jsc <the at sign>

    All lands in the same inbox. BTW, do you know what happened to the
    company Telequipment?
  5. daceo

    daceo Guest


    Those new tek scopes suck IMO, we get them calibrated and some of them
    are right up on the 3% for the volts, How do they do that? And I guess
    when you switch to FFT mode that noise is what you see on the
    screen.... My current one takes longer to boot up than my old valve
    tek use to take to warm up!!! welcome to the 21st century, apart from
    that they are OK for simple digital stuff.

    My school gave me the above mentioned lovely old tek scope (best part
    of 20 years ago) because it was too complicated and no one could get
    it to work!!! pick your school.

  6. Jim Yanik

    Jim Yanik Guest

    TDS scopes are calibrated on automated test stands.

    All TEK cares about is that it's WITHIN the specs,not optimized.
  7. Eeyore

    Eeyore Guest

    Tek bought it IIRC.

  8. Eeyore

    Eeyore Guest

    My first scope (a freebie from school - it was considered to be B.E.R.) was yet
    another Telequipment as it happens. I have some pics somewhere, I must drag them

    I started off with that Telequipment ( valve/tube) very basic - followed by
    another valve/tube Telequipment (much nicer and it had real plug-ins including a
    lovely differential input with 100uV/cm ? sensitivity on a x100 switch).
    Following that a brace of Tek 545s. A 545A and a 545B. Insanely huge but aren't
    real dual beam tubes great ? Thereafter a Gould-Adavance OS250B (classic) and
    lastly a Tek 645 (no contest).

  9. John Larkin

    John Larkin Guest

    I had a Telequipment scope once, and I thought it was vile. Crappy
    focus, flimsy bezel, parallax, funky knobs.

    My personal scope, the one I keep in my mini-lab in my office, is a
    TDS2012 [1] and I really like it. I haven't had any trouble with
    triggering or anything, and haven't noticed any excess emi, past the
    mess from Sutro Tower. With the input open, 100 MHz bw, 2 mV/cm, I'm
    seeing under 1 mV p-p of random looking noise, nothing I can trigger
    on coherently.

    Sometimes I front it with an AM502 diffamp for the really little

    But for line frequency hum, you could just line trigger and signal
    average up to 128:1, and pluck the line-coherent component out of
    bigger signals. Or FFT and look at the spectrum. Try that with your


    [1] plus a Tek 11801 20 GHz sampler, which must weigh 20x the TDS.
  10. Eeyore

    Eeyore Guest

    They also obviously don't care about the radiated EMI !

    It was *1.5V* FFS on a normal Tek probe terminated with a couple of ohms ! I was
    perplexed to say the least.

  11. john jardine

    john jardine Guest

    Tis done.
    As Eeyore says, they went to Tek. There's a lot still in use in the UK.
    Straightforward, repairable. At the time they were an affordable bench
    'scope bought in preference to the Tek items, who's prices were out of
  12. Joerg

    Joerg Guest

    Thanks, John, got it. Man, I didn't think that D66 scope was this old.

    And of a rather robust quality I might add. Like my old Hameg which
    managed to create a huge outward dent into a car fender when I had to
    evade a guy that overshot a stop sign. It still worked like nothing had
  13. Joerg

    Joerg Guest

    That's like trying to listen to Mozart while taking off in an F-16.

    ... With the input open, 100 MHz bw, 2 mV/cm, I'm
    Signal averaging is done by turning off all lights and closing the
    curtains, FFT by having a couple shots of single malt and squinting :)
  14. BFoelsch

    BFoelsch Guest

    Uhhhh, neither the 545A nor the 545B was a dual beam scope. In that era, the
    only dual beams were the 555 and the 551. Both of them had external power
  15. Eeyore

    Eeyore Guest

    After this recent run-in, I intend to restore my Advance OS250B to full working

  16. Jim Yanik

    Jim Yanik Guest

    FYI,TEK did not make the Telequipment,I believe it was their first attempt
    at remarketing other companies test equipment.
    TEK also sold a Dolch LCD handheld scope rebadged as a "TEK" scope,and sold
    Taiwanese low cost function generators,counters,and DMMs as "TEK"

    It used to be that all the equipment sold in the TEK catalog was made BY
    TEK. Not anymore.

    I suspect it's more non-TEK than TEK now.
  17. I still use a D65 which I bought new in 76 and have the paper manual
    which is common to the D66.

    There are some other Telequipment manuals at


    and they are requesting others. I've been intending to scan my copy.
    Do you feel like offering it to them also?
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