Test Equipment Anonymous

Where would that watt hour meter have been designed / used for then at just 25Hz, I always thought the standard was for either 50 or 60Hz? Niagara Falls? https://en.wikipedia.org/wiki/Utility_frequency#25_Hz_origins Many US electrified railroads are 25Hz to this day. Old New Haven and Pennsy are ex...

Wiggly things certainly have their place for adjustments such as you describe. However at rough count I already had nine before I bought this, including TRMS and RF millivoltmeters as well as a VVM. Then there are four portable ones including a couple of AVOs. So I'm not entirely sure what induced ...

I just used my 427A (Mains option, and no scaly flakes) to adjust the gain of the outputs of my distribution amp, over in this repair thread.:



That is exactly what the wigglies are good at -- gain / balance adjustments.

others here disagree......but I have always really liked the look of those dot LEDs. the 8640b locked to a rubidium standard is my go to sig generator for anything under 500 Mhz. I've got it stacked under my 5245L right now, and there is beauty in both. Through playing with the LF gen in the 8640, ...

New arrival, the - hp - 8640B! It's been on the wish list basically since I was bit with the TEA bug. And now I own one. A colleague, who already owns one, tipped me off on one that was offered at a low -- for Sweden -- starting price of about 150USD. And it was very local, and pickup only, the lat...

No, the Tek PSU has a North American plug (NEMA 5-15P). Technically this makes it illegal to use in the UK. Given the mediocre qualities of the Nema 5-15P it should be illegal worldwide. I do have a small assortment of compatible cables and outlet strips, bought back in the day when laptop batterie...

I thought I had my counter fill, what with 5221A, 5245L and 5316B, adding to that also the TTi TF830 -- but no. The 5335A will again be put on the "desirable items" list for the boat anchor category, together with "any good - hp - RF signal generator good to 1Ghz" and 3325B and t...

Given how safety critical they are, I really think headlights and turn signals should be designed so that the bulbs are easily field-replaceable, ideally without any tools, but that's just my opinion and clearly not one shared by all of the automakers. The 2007 Volvo V70 I have has horrible access ...

Excerpt from Tekscope Aug 1970 with HV debugging steps. Very nicely written and good comment at the bottom. (Gorgeous scope, btw! I like.) Only, as noted in Discord, that the comment at the bottom disqualifies a sizeable portion of humanity from taking part. The debugging instructions are quite goo...

I like meters that can display more than a single value. I would concur, even if it is from the point of much simpler devices -- my 3 1/2-banger Scopemeter123 does two measurements/traces and also remembers the last unit measured, (with some exceptions, volts after ohms would probably not be sensib...

bd139 wrote: ↑Sat Oct 19, 2024 9:55 am They are ferrules. It's to stop the clamp diode desoldering itself before the fuse pops

Oh, really?

Cool, if so.

Anyway, needing 300V DC does happen from time to time, so a supply for it is in planning.

So, new arrival (talked about it in Discord, but that's only half of the introduction to the community.): - hp - 3478A Multimeter, my first real foray into "many digits". It was not very expensive, but not as cheap as I would have wanted. Contrary to the cautions made by the very decent se...

bd139 wrote: ↑Tue Oct 08, 2024 7:34 am I have a weird undocumented HP427A which is the mains and battery option one. It has been converted to mains only with a battery eliminator.

Mine is that too. The battery has been removed.

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 managed to not buy a 410c today, and also, which was a bit more annoying TBH, failed to bid on an ESAB inverter MMA welder. I've decided I need one, as there are things that turn up and need welding. What made you decided pass up on the 410C? I just was busy as the auction end neared. And there's...

I managed to not buy a 410c today, and also, which was a bit more annoying TBH, failed to bid on an ESAB inverter MMA welder. I've decided I need one, as there are things that turn up and need welding.

Just scored a 3478A for a little more than I wanted, but I've had one on the want list for some time. Sold as "uncalibrated" and with a fairly hot PCB around the safety zener for what looks like the 5V regulator for the analog part (LM340-LAZ-5). Suppose a quick measurement will tell wheth...

My distortion test set is a 3-bay TM500 frame with a SG505 oscillator and the AA501 analyser. The SG 505 is impressive -- in the audio pass band it's specified to 0,0008% THD. I've got the version with balanced output which is a really nice thing to have. According to the manual, it's a "phase ...

<r><QUOTE author="tggzzz" post_id="9120" time="1726176837" user_id="64"><s>[quote=tggzzz post_id=9120 time=1726176837 user_id=64]</s> <QUOTE author="mnementh" post_id="9117" time="1726161783" user_id="62"><s>[quote=mnementh post_id=9117 time=1726161783 user_id=62]</s> Mum and I talked aboot similar ...

Cubdriver wrote: ↑Fri Sep 13, 2024 2:45 am ..removed pic because you just saw it...

Excellent. Along the same lines as the small cars whizzing around in early Tektronix schematics, or the "BFR" logo inside large enough Cisco routers.

Confirmed. I have the Asteroids game.

Also, the rotary encoders are a bit jittery. The only Internet search finds on that is a blog post on the older "Digitizing Oscilloscope" series which turned out to be hairline cracks in the encoder PCB. I'd rather not.

Scope arrived. Packaging was abysmal. Scope survived unscathed. Probably due to the rack mount kit which is quite a bit of steel. Upon power-up, it complains about its battery, and so, but is otherwise working. Self test passes. I need to do an user cal -- the last one was in 2005. I immediately hav...

The GPIB module is just a GPIB module on these, I think you're thinking of the Tek TDS210. FFT is standard on 546xx series scopes https://www.alldatasheet.com/datasheet-pdf/pdf/132281/HP/54622A.html Ah, thanks. Also, shipping company has made noises indicating they've been alerted to a package bein...

That radio looks cool, and it's nice to see AM/FM stations still alive, in these days of trashy DAB We actually don't have DAB here anymore. Good, mostly. No, but seriously. DAB (backronymed as "Dead At Birth" by some here) was promising. Until people started to realise what kind of trans...

AVGresponding wrote: ↑Mon Aug 26, 2024 8:02 am Is there an ebay link or similar?

Yup,

https://www.tradera.com/item/1711/64209 ... scilloskop