Test Equipment Anonymous

By that token, my HP 427A has already been converted to mains operation by the two banana sockets. My TF2700 has a normal modern low voltage socket fitted. I'm sure I powered it from a bench PSU. PP9s are about £7.50. They appear to have just been discontinued by EverReady. Homebase are flogging the...

I have an HP 427A I mean to do something about. It's supposed to be battery operated. The batteries are available but cost more than I paid for it. Considering its performance, I can't see why I'm inclined to mess with it but it is from HP's golden age. Is yours strictly battery operation only? The...

I have an HP 427A I mean to do something about. It's supposed to be battery operated. The batteries are available but cost more than I paid for it. Considering its performance, I can't see why I'm inclined to mess with it but it is from HP's golden age. As for welders, I have four: An 80 Amp buzz bo...

A previous generation automotive oscilloscope with features particular tor internal combustion engines. Probably not good for general use, but just the thing if you want to diagnose and tune a 30 year old sports car.

That said, I nearly did buy one about 5 Hamfests back, but it was a 75 Ohm one-------a definite "trap for young players"! And not so young players. I bought an HP8601A sweeper a year back. I didn't spot it had the 75 Ohm option. It wouldn't have made much difference because it was only £1...

That said, I nearly did buy one about 5 Hamfests back, but it was a 75 Ohm one-------a definite "trap for young players"! And not so young players. I bought an HP8601A sweeper a year back. I didn't spot it had the 75 Ohm option. It wouldn't have made much difference because it was only £1...

Progress today getting the overall vertical gain, DC balance, etc set on both channels but also ran into a major issue. Channel 2 fell into place with no issues but channel 1 would intermittently lose proper gain. Traced it to the attenuator switch deck assembly. There's major slop in the main shaf...

Fascinating. The Polyskop was clearly a remarkable piece of equipment back in the day.

However, on balance, it's far too big and heavy and I'm glad I didn't buy it. To be honest I wasn't even slightly tempted.

That may be it. Any outdoor stalls are going to be a dubious proposition from September on. They seem to have gotten away with it at the Chippenham winter rally.

On National Hamfest. The "fleamarket" pitches outside were £30 for one table. You are nhave ot allowed a gazebo or awning and if you have an assistant they have to pay another £7. The R&S Polyscope is an early network analyser. It was a single box, large display, two port solution whe...

tggzzz wrote: ↑Wed Sep 25, 2024 9:41 pm Quite believable.

My only thing like that is a Keithley 2015THD. It is a standard multimeter which contains an audio DDS, and can measure the THD. The DDS has a 0% THD, a power amp I used to have had 0.011%.

The DDS has a 0% THD

A likely story.

Whether a rally is any good or not depends on what you are interested in and how sharp eyed you are. It might produce a stack of manuals you have been looking for, or books, or components. It might yield an obvious wreck for not much, which happens to have the missing bits for another wreck you've m...

If I wanted a low distortion signal source it'd be a wien bridge oscillator with some non-linear feedback (light bulb or FET). Yes. A special thermistor produced pretty low THD easily but they are no longer made. The better sig gens used a CdS cell and LED. There are some very elaborate feedback st...

I went there on Friday. I got there late, after 10am, having taken a detour. The weather on the M5 was horrific. I bumped into a couple of ex-colleagues from the Bristol area. The M5 was closed lower down because of surface water and they'd been diverted onto the A38. The rally: I went there the yea...

A friend told me how he'd worked in a placed where they'd stretched the budget to buy a top end HP scope. They couldn't bring themselves to splash the extra on the matching scope trolley, so they put it on an old tea trolley.

Anyone on here going to National Hamfest on Friday and interested in a HP 1183A Instrument Mobile? Designed for the 54600 series of 'scopes MSOs etc will also taka other instruments. ANY offer considered. Scope not included (I do have a nice 54645D MSO but it would be extra). Agilent-1183A.jpg coem...

Analogue function generators using a shaping circuit, never produce a particularly low distortion sine wave, which is needed for distortion measurement. I wondered about that, but such generators seem to have a "nipple" on the waveform, and that Hameg doesn't. My Thandar TG501 (probably f...

Yep and exactly why Jonesy let TEA go on so long until someone more precious than us brought the idle chit-chat that was core to the thread to the attention of Geoff (gnif) and the shitshow ensued. Even now with its much reduced participation it will continue to remain the #1 thread for a good whil...

Analogue function generators using a shaping circuit, never produce a particularly low distortion sine wave, which is needed for distortion measurement. It's strange that the Hameg distortion meter correctly detected no distortion from the QA403 but significant distortion from the 8903B. I would hav...

I put the Hameg scope and frame with the function generator and distortion analyzer on the bench this afternoon for a test run just to get an idea of what kind of shape they're in and try them out. This is the first time I've ever used Hameg equipment. The scope works and most of the problems I was...

Stickiness draws newbies attention, and indicates that the thread has important information with a long lifetime, that will be of interest to many people. The TEA thread did not have those attributes. In contrast, the TEA thread was largely ephemeral chit chat between a small group of wierdos. The ...

It became far too cumbersome as a single thread . ........................ Interesting to reflect on maybe, but basically water under the bridge. Yet in many ways that was its attraction....follow it or miss what was going on. Usually I found it engaging, sometimes infuriating. Generally I can filt...

It became far too cumbersome as a single thread. For instance someone might start a discussion on restoring an HP spectrum analyser, where he got stuck because a plastic cam switch was broken. That would turn into a discussion about various glues, whether it could be plastic welded, whether it could...

Sometimes I go there through a Google search. Other times I go there directly and search. There's a lot of useful information there that doesn't always turn up in a Google search. Occasionally I skim through it and see if there's anything of interest. I may contribute if I consider I have something ...

MED6753 wrote: ↑Sun Sep 22, 2024 6:25 pm
Who is this masked man?

More to the point, who cares?