Author Topic: List your test equipment "scores" here!  (Read 458453 times)

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Online PA0PBZ

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Re: List your test equipment "scores" here!
« Reply #2075 on: July 06, 2018, 12:23:00 am »
- Tracking gen(shown active in the picture over the full span. Kinda wonder where the dip comes from.

Probably in need of a normalize or an old normalize active?

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Online Ice-Tea

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Re: List your test equipment "scores" here!
« Reply #2076 on: July 06, 2018, 12:50:33 am »
Ah! Probably. Thanks for the pointer.
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Offline bitseeker

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Re: List your test equipment "scores" here!
« Reply #2077 on: July 06, 2018, 06:32:50 am »
Very cool SA, Ice-Tea! Quite the boat anchor(s) like the HP 8566/8568.

As for its age, perhaps the quickest answer is inside on some of the components unless there's a pull-out module that might give a hint.
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Online Ice-Tea

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Re: List your test equipment "scores" here!
« Reply #2078 on: July 06, 2018, 07:27:12 am »
As for its age, perhaps the quickest answer is inside on some of the components unless there's a pull-out module that might give a hint.

You're just trying to trick me into taking it apart!  :-DD :box:
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Offline bitseeker

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Re: List your test equipment "scores" here!
« Reply #2079 on: July 06, 2018, 12:03:21 pm »
LOL. I'm sure if you wanted to take it apart, the photos would be up already. :-DD
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Offline Cubdriver

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Re: List your test equipment "scores" here!
« Reply #2080 on: July 06, 2018, 02:26:50 pm »
As for its age, perhaps the quickest answer is inside on some of the components unless there's a pull-out module that might give a hint.

You're just trying to trick me into taking it apart!  :-DD :box:

Oh, we KNOW you want to take it apart.  We're just being our usual oh-so-helpful selves by providing you with further justification for doing so.  Cuz, you know, we're good like that...

 ;D

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If it jams, force it.  If it breaks, you needed a new one anyway...
 

Online Berni

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Re: List your test equipment "scores" here!
« Reply #2081 on: July 06, 2018, 03:30:25 pm »
Well the guts of a HP 8566B are pretty impressive looking so one would expect some neat stuff to see in this one too.

The most difficult part in taking the off lid of a HP 8566 is lifting it on the bench, actually getting the lid off is just a single screw to slide it right off.
 

Offline med6753

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Re: List your test equipment "scores" here!
« Reply #2082 on: July 06, 2018, 03:56:35 pm »
$35 USD on Ebay. Works perfect.

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Online Ice-Tea

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Re: List your test equipment "scores" here!
« Reply #2083 on: July 08, 2018, 02:15:37 am »
Been looking into that IFR 6201B a bit more.8G SNA, power meter
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Offline precaud

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Re: List your test equipment "scores" here!
« Reply #2084 on: July 09, 2018, 03:55:31 am »
Just acquired this from a friend in non working condition.
The +5V supply was repaired and in the process I managed to break the +40V supply.

It's just the universe seeking balance...

Quote
Fixed. and all appears to be working.
Just a basic HP-8901A modulation analyzer.

Nice. They're still in demand, I see them on want lists all the time.
 
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Offline precaud

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Re: List your test equipment "scores" here!
« Reply #2085 on: July 09, 2018, 03:59:23 am »
Anyway, I've got three of the low frequency Metcal (MFR single tool) supplies sitting in my pile of stuff, they came from the same scrapyard, but neither irons nor stands ???

Hmmm... I have two of the irons sans base... been sitting on 'em for years... (well, not literally...)
 

Offline AF6LJ

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Re: List your test equipment "scores" here!
« Reply #2086 on: July 09, 2018, 04:23:30 am »
Just acquired this from a friend in non working condition.
The +5V supply was repaired and in the process I managed to break the +40V supply.

It's just the universe seeking balance...

Quote
Fixed. and all appears to be working.
Just a basic HP-8901A modulation analyzer.

Nice. They're still in demand, I see them on want lists all the time.

It's handy considering I am sitting next to not one but three broken service monitors.
I do have to stick a screw driver in it, and put the 10MHZ reference on frequency.
This one does not have the high stability oscillator option.

 
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Offline wkb

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Re: List your test equipment "scores" here!
« Reply #2087 on: July 17, 2018, 06:41:15 am »
Neat!  That is the first scope I even had my hands on.  LIke when I was 9 years old :)  IIRC it has a ECC83 vertical amplifier input stage.
 

Offline Neomys Sapiens

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Re: List your test equipment "scores" here!
« Reply #2088 on: July 20, 2018, 08:39:59 am »
So, despite being only sporadically online (and having aquired a new used Lenovo hack), I nevertheless made some nice aquisitions:

The Tek TM500 list got longer by a PS505 and a spare PS501, a nice Hi-Z measurement amplifier (the hammer-effect enamel project box would have been worth the 12.-€) and a Philips PM9355 current clamp with amplifier for 40.-€! (it was labeled as amplifier for PM9355!!)
The latter two are still untested, although.

So far, so good - I will post an update when they are tested. More to expect.


 

Offline SteveOregon

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Re: List your test equipment "scores" here!
« Reply #2089 on: July 23, 2018, 06:34:14 am »
Tek 475A with DM44 module. Free. The company I worked for (before retiring) was going to scrap it, because it failed the temp meter calibration, and the cal department didn't want to give it an exception. Told them I would take it (about eight years ago).  Still works perfectly to this day (I never tested the DM44 temp meter, and could care less). 

 

Offline bitseeker

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Re: List your test equipment "scores" here!
« Reply #2090 on: July 23, 2018, 09:24:56 am »
Good thing you were able to grab it! :-+
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Offline AF6LJ

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Re: List your test equipment "scores" here!
« Reply #2091 on: July 23, 2018, 11:39:36 am »
Very nice and the price was right.  :-+ :-+
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Offline mtdoc

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Re: List your test equipment "scores" here!
« Reply #2092 on: July 24, 2018, 02:58:35 am »
Good score Steve. I like your green and airy lab space. Not much bench space though....
 

Offline AF6LJ

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Re: List your test equipment "scores" here!
« Reply #2093 on: July 24, 2018, 08:39:48 am »
Good score Steve. I like your green and airy lab space. Not much bench space though....
Very nice; comes up short on bench space though, but the lighting is to die for.  :)
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Online VK5RC

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Re: List your test equipment "scores" here!
« Reply #2094 on: July 24, 2018, 09:26:49 pm »
That Lab has no fume problems either!
Whoah! Watch where that landed we might need it later.
 
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Offline rob.manderson

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Re: List your test equipment "scores" here!
« Reply #2095 on: August 05, 2018, 12:55:32 am »
My latest aquisition is an HP59401A GPIB Bus Analyser.  Got it for US$15.35 - the shipping was $29.99  :)  (I await Bitseeker's comment of 'Ah, so that's who got it'!  :-DD)

Out of Seattle so my guess was it was from Boeing - and sure enough there's the Boeing sticker on the top.  The seller claimed it was taken from a working system.  Uh huh - I can't think of a single reason, in 2018, for a GPIB bus analyser being in a production line system (which is the implication I read into 'taken from a working system').

Anyway it doesn't work.  Front panel character display shows nothing (though the control line leds seem to be showing valid states).  I'm about to dive in and find out what's wrong.  I'm guessing power supply (fingers crossed).

I searched and searched but could find no online schematics.  Yep, there's an operators manual but no schematics.  Fortunately Artek have it so there's another 15 bucks.  I'm almost starting to think it might have been cheaper to buy the HP/Agilent usb adapter and have done with it.  But I'm into the money pit now.

So why, in 2018, would anyone actually buy this dinosaur (1975ish design)?  I'm trying to get Emanuele Girlando's arduino code working!  It works fine against my HP5335, HP3325 and HP3456 instruments, but my HP8568 doesn't want to play nice.  I'm convinced there's something in the arduino code that's not quite right.

The problem is that the HP8568 locks up after I send it a command with the REN line asserted.  By locks up I mean that the display freezes.  Switch back to local and it executes the command and the display becomes active again.  If I leave REN unasserted the HP8568 behaves properly except that it doesn't light up the REM indicator.  And leaving REN unasserted for the other instruments means they never go into Remote mode (but still respond to commands and return data).

Yes, I've considered the possibility that there might be something wrong with the HP8568 but it seems unlikely.  My reading of the HP8568 service manual doesn't show anything like a Listen or Talk only mode.
 
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Offline bitseeker

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Re: List your test equipment "scores" here!
« Reply #2096 on: August 05, 2018, 03:41:31 am »
Ah, so that's who got it! :-DD

Sorry to hear it's not a happy camper, Rob. Yeah, hopefully, it's just the power supply. If it becomes too much to fix, it's sure to have lots of nice GPIB parts and these old HP enclosures are great for repurposing. It'd be great to see it working again, especially for the Girlando interface debugging.

I look forward to hearing more about your findings on both fronts.
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Offline rob.manderson

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Re: List your test equipment "scores" here!
« Reply #2097 on: August 05, 2018, 04:27:15 am »
lol - glad you took that comment the way I meant it  :-DD

Nope - it's not the power supply.  Seems to be somewhere in the clocking.  I'm seeing no activity on any of the display multiplexer lines.  They don't seem to have used a crystal to generate the internal clock - it looks like a multivibrator fashioned out of a 7438 and a 7414 schmitt trigger.  However, it doesn't want to work on an external clock either so I'm digging around at the logic in that area.  It doesn't help that I'm dredging up 35 year old memories of working on TTL :-)

This beast is so old it's all TTL with a couple of MOS memory chips - it has a whopping 32 character memory!  There are a couple of PROMs, one for the character generator and I'm assuming the other forms part of a state machine.  The manual is somewhat light on details like that.  Surprisingly, the manual *does* list the contents, in octal, of the proms!  Also, quite surprisingly, most of the chips are marked with both the HP part number and the corresponding known to the rest of the world as... part number.  Even the transistors in the power on reset circuitry are marked as 2N3904's.

Ah, but it's all fun and a challenge.  I really enjoy repairing stuff of this vintage.
 

Offline bitseeker

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Re: List your test equipment "scores" here!
« Reply #2098 on: August 05, 2018, 04:40:48 am »
lol - glad you took that comment the way I meant it  :-DD

No worries. I actually lol'd when I saw it as I didn't think I had posted it so much that it had become a meme. Too funny.

Quote
...snip...
Ah, but it's all fun and a challenge.  I really enjoy repairing stuff of this vintage.

There doesn't appear to have been a teardown or repair thread for one of these. If you're so inclined, it'd be cool to start one to document the old beast, share your findings, and see who else might have one or be familiar with it.
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Offline precaud

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Re: List your test equipment "scores" here!
« Reply #2099 on: August 05, 2018, 05:51:20 am »
I've had one for over 20 years, but never found it to be useful when troubleshooting a GPIB setup...    :-//

The problem was almost always my code  :)
 


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