Any suggestions / advice?
I have a working scope, but it was not calibrated over the years.
Looking reasonable price and trusted service to calibrate it in SF or Bay Area.
I have a working scope, but it was not calibrated over the years.
Looking reasonable price and trusted service to calibrate it in SF or Bay Area.
Hi
I don't think you mean calibration. Could it be you want your unit brought back to original specification?
Instrument calibration tells you the offset or error your instrument (as it is now) is adding each measurement. Therefore after calibration you will know that if you measure something as 1V it really is 0.95V (example)… Calibration gives you the "conversion" factor up or down as the case may be to apply for instrument. Calibration uses known and verified 1.0000V signal and measures using your instrument to see if it reads as 1V or 1.1 or 0.95
Maybe what you want is someone to apply the "adjustment procedures" in the service manual using any required support test instruments to bring the instrument within spec or as close as possible and in some cases even better than spec.
good luck
paba
I don't think you mean calibration. Could it be you want your unit brought back to original specification?
Instrument calibration tells you the offset or error your instrument (as it is now) is adding each measurement. Therefore after calibration you will know that if you measure something as 1V it really is 0.95V (example)… Calibration gives you the "conversion" factor up or down as the case may be to apply for instrument. Calibration uses known and verified 1.0000V signal and measures using your instrument to see if it reads as 1V or 1.1 or 0.95
Maybe what you want is someone to apply the "adjustment procedures" in the service manual using any required support test instruments to bring the instrument within spec or as close as possible and in some cases even better than spec.
good luck
paba
I thought that calibration(ok, adjustment) is - set back proper values or delta, in nvram or something, depend on how it work. Same what I do with tape decks calibration. So i can trust to results and can do some measurements.
Look like I really want some adjustment actually.
Look like I really want some adjustment actually.
yeah "calibration" is a service where they rarely if ever open the instrument, it is related to traceability to the accuracy of measurements for that instrument. Eg they compare and record various time / frequency and voltages of that instrument to known accurate "standards". It's a record keeping service mostly to meet certain (usually Gov't) requirements. If you pay for this on a single instrument its not much return for the cash outlay.
if the O-scope is working, just use it until you see a problem, then compare to another instrument or standard such as DMM you might have around. If you find a problem then you should find a repair service, you can also pay them to check functionality, but what they do may or may not meet factory adjustment procedures ( expensive ). IMO Repair service fix known problems they rarely build trust back to factory new.
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ok, thanks.
is it possible to calibrate tek2465b byself so-so?
with a good 6 digit multimeter, like Keithley 2015.
is it possible to calibrate tek2465b byself so-so?
with a good 6 digit multimeter, like Keithley 2015.
yes just about any bench DMM will exceed front panel accuracy
you may need to compare test algorithms to check absolutes
most folks don't use o-scopes for accuracy mostly visual checks and trends
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Basically:
If one can't determine accuracy and produce some type of verification of that accuracy, than method of measurement is unreliable and invalid..
If you can't check it, you can't make it. (See: Metrology)
Being able to verify a measurements accuracy is as important as the measurement itself.
That said: From ElecTech or DIY standpoint one really needs to know how to calibrate/checkout/setup own scope as part using it on a regular basis. Recommended proceedures & tools are in service or operations manual.
But agreed it's nice to have it all pre-tuned in when first getting use to any new scope to develop some tests & checks knowing the accuracy is there.
I recently accquired a Heathkit IG-4244 Precision Scope Calibrator (which has a somewhat modern circuit) off EBay for $85. and really fits the multipurpose tasks of most OScopes qualification..at least for personal bench use. Don't appear very often but worth wait IMO.
The more common econo version IG-4505 is not really of much great use with 42xx series (one can get simple opamp to do more). The 4244 was about $180new vs $44. for 4505 DTSP Sure there are better/other units avail.
Jackinnj's and others opinion on this topic would be far more credible & informative than mine.
But I certainly don't see having to rely on an occasional outsourced & distant qualification as a means to 'know your own accuracy' , only really serves to validate.
Whereas the goal is to make better, more realible use of it as a tool by "knowing how to properly use it, aware of its potential & limitations."
If one can't determine accuracy and produce some type of verification of that accuracy, than method of measurement is unreliable and invalid..
If you can't check it, you can't make it. (See: Metrology)
Being able to verify a measurements accuracy is as important as the measurement itself.
That said: From ElecTech or DIY standpoint one really needs to know how to calibrate/checkout/setup own scope as part using it on a regular basis. Recommended proceedures & tools are in service or operations manual.
But agreed it's nice to have it all pre-tuned in when first getting use to any new scope to develop some tests & checks knowing the accuracy is there.
I recently accquired a Heathkit IG-4244 Precision Scope Calibrator (which has a somewhat modern circuit) off EBay for $85. and really fits the multipurpose tasks of most OScopes qualification..at least for personal bench use. Don't appear very often but worth wait IMO.
The more common econo version IG-4505 is not really of much great use with 42xx series (one can get simple opamp to do more). The 4244 was about $180new vs $44. for 4505 DTSP Sure there are better/other units avail.
Jackinnj's and others opinion on this topic would be far more credible & informative than mine.
But I certainly don't see having to rely on an occasional outsourced & distant qualification as a means to 'know your own accuracy' , only really serves to validate.
Whereas the goal is to make better, more realible use of it as a tool by "knowing how to properly use it, aware of its potential & limitations."
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I have mentioned this before, but your local hospital's Biomedical Engineering department (sometimes called Biomed or Clinical Engineering) needs to have their test equipment calibrated by a certified Metrology company. They not only certify accuracy with their precision references, most also repair equipment. Yes, O-scopes of the older vintage are not as common in the Biomed world as they were years ago, but they are still around. Voltmeters, bench meters and safety analyzers are abundant. Call your local hospitals and see when a Metrology visit is scheduled and politely ask if you could bring your scope. Last time Metrology was on-site, my bench meter was $65 for a certification (included certificate and cal sticker) and they did my hand held meter for free (no certificate or cal sticker). Had I questioned my scope, I would have had them check it and then certify it. A basic analog scope cert from my vendor is under $100.
Good luck.
Good luck.
Thanks for the answers.
May be anybody have a documentation for the older version of 2465bdm? Not a new one.
May be anybody have a documentation for the older version of 2465bdm? Not a new one.
Sorry, but I do not have tek 2465 documentation, but i did work at Motorola as a cal lab tech.
When we used to do a regular/annual cal cycle for a scope we went through the instrument performance test procedure. If the instrument failed a performance test then we did the cal to bring it back into spec. very seldom did we have to do any adjustments to put a new cal sticker on it.
The bottom line with a cal, many times you are paying for a cal sticker and the scope was not even opened up.
Like someone said above you can use some regular test equipment to verify some of the scopes performance. You can improvise with attenuators and frequency generators for other tests. Like who these days has a fancy tek time mark generator like we used to use 🙂
When we used to do a regular/annual cal cycle for a scope we went through the instrument performance test procedure. If the instrument failed a performance test then we did the cal to bring it back into spec. very seldom did we have to do any adjustments to put a new cal sticker on it.
The bottom line with a cal, many times you are paying for a cal sticker and the scope was not even opened up.
Like someone said above you can use some regular test equipment to verify some of the scopes performance. You can improvise with attenuators and frequency generators for other tests. Like who these days has a fancy tek time mark generator like we used to use 🙂
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