Time Electronics 9803 Oscilloscope Calibrator - What are my chances with this? - Page 1
Forum section: electronics / testgear

author: Chris56000
author_rank: Frequent Contributor
timestamp: October 22, 2017, 11:20:39 pm
content: Hi!I've been looking for an Oscilloscope Voltage/Time calibrator to test my oscilloscope collection, I'd love a Bradley 192 but they're as rare as hen's teeth, the last one I saw was over £500 and half as much again for carriage from USA, and the Flukes, Datrons, etc., etc., cost more than a decent car!!Anyway I came across this Time Electronics 9803 for £100, (and the Seller's bringing it to me!), the VFD is alight and very bright and even, showing some sense on it, but there's obviously some fault or I wouldn't have got it at that price!!What are my chances of getting documentation/schematics/adjustment info for it? (I'm aware Time pot vital chunks of their circuits in boxes!)If I'm unlucky and there does turn out to be problems in the potted thingy(s), can anyone point me in the direction of a safe method for dissecting these things?I've never seen anything like this before and info seems to be non-exsistent!Chris Williams

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: October 22, 2017, 11:23:36 pm
content: Depending on its age there might be a board I designed in there - don't know about the rest of it though!

author: tautech
author_rank: Super Contributor
timestamp: October 22, 2017, 11:30:52 pm
content: Quote from: mikeselectricstuff on October 22, 2017, 11:23:36 pmWhich could suggest you have contacts to where the OP could source a service manual from. No ?

author: Chris56000
author_rank: Frequent Contributor
timestamp: October 22, 2017, 11:39:15 pm
content: I'll be putting tear-down piccies up, along with such info as I can scribble out, but I dread to think what I'd be charged for calibration tho' if it turns out to be too far out after I've got it working!It's used on the same principle as the Bradleys, Teks, etc., you set the O/P the Volt/div or Time/Div for the range of the 'scope you're checking, then you use the fine varnier buttons until the time-markers or vert. amplitudes line up with the graticule markings and then read off the % error (+ or -) and compare it with the 'scope's spec, alternatively you set the O/Ps to nominal V/div or Time/div then adjust the 'scope gain/time cal. presets to get it as close to graticule-lines as possible.(I did work 18 months at Keysight but alas to say it was not harmonious!)Chris WilliamsPS!Can someone point me in the direction of a type no/stockist for the Front-Panel Switches/coloured caps please? I believe Elektor used them a lot in the 80s and they always called 'em "Digitast" but I've no idea what they are now!

author: nidlaX
author_rank: Frequent Contributor
timestamp: October 22, 2017, 11:58:43 pm
content: Quote from: mikeselectricstuff on October 22, 2017, 11:23:36 pmWhoa, did you work / contract for Time Electronics at some point? Have you ever talked about it on the forum here or on YouTube?

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: October 23, 2017, 07:44:12 am
content: Quote from: tautech on October 22, 2017, 11:30:52 pmNo -haven't worked with them for maybe 10 years

author: Chris56000
author_rank: Frequent Contributor
timestamp: October 24, 2017, 10:10:14 pm
content: Hi!I powered this up yesterday and there was distinct traces of hot thermionic-valve type smelling coming from somewhere inside, so it looks there could well be any number of charred, unreadable resistors within!I've not begun the tear-down & examination yet!Chris Williams