Hewlett Packard Power Cord

[Greg P]

Anyone know where I can find a power cord for an old HP Frequency Counter that I just got.  Seems these have been obsolete for a while and Belden doesn't make them anymore.

I've checked Ebay and some are stupid expensive, almost as much as I paid for the counter.

This is the style...Any leads would be greatly appreciated

[martin martin]

What state are you in?

There’s a surplus store in San Fernando CA called Apex 

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[Greg P]

Martin...Unfortunately, I'm in Pennsylvania...I hear Apex is a really cool place.

On Tuesday, May 7, 2019 at 10:31:03 AM UTC-4, martin martin wrote:

What state are you in?

There’s a surplus store in San Fernando CA called Apex 

On Tue, May 7, 2019 at 07:28 'Greg P' via neonixie-l <neoni...@googlegroups.com> wrote:

Anyone know where I can find a power cord for an old HP Frequency Counter that I just got.  Seems these have been obsolete for a while and Belden doesn't make them anymore.

I've checked Ebay and some are stupid expensive, almost as much as I paid for the counter.

This is the style...Any leads would be greatly appreciated

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[martin martin]

I can get one and send it, but might be easier to convert to the PC type.  Depending on space. 

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[Greg P]

Thanks Martin....I'm going to check locally.  Apex has some listed on Ebay so I can always order.  I'm just being cheap not wanting to spend $35 for one.

On Tuesday, May 7, 2019 at 10:44:41 AM UTC-4, martin martin wrote:

I can get one and send it, but might be easier to convert to the PC type.  Depending on space. 

On Tue, May 7, 2019 at 07:37 'Greg P' via neonixie-l <neoni...@googlegroups.com> wrote:

Martin...Unfortunately, I'm in Pennsylvania...I hear Apex is a really cool place.

On Tuesday, May 7, 2019 at 10:31:03 AM UTC-4, martin martin wrote:

What state are you in?

There’s a surplus store in San Fernando CA called Apex 

On Tue, May 7, 2019 at 07:28 'Greg P' via neonixie-l <neoni...@googlegroups.com> wrote:

Anyone know where I can find a power cord for an old HP Frequency Counter that I just got.  Seems these have been obsolete for a while and Belden doesn't make them anymore.

I've checked Ebay and some are stupid expensive, almost as much as I paid for the counter.

This is the style...Any leads would be greatly appreciated

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[martin martin]

I just bought that 1974 counter timer and luckily it came with one (see post)

But I have converted those old ones before- no too hard just time consuming 

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[John Rehwinkel]

> Anyone know where I can find a power cord for an old HP Frequency Counter that I just got. Seems these have been obsolete for a while and Belden doesn't make them anymore.

Someone was making them recently, but I don't remember where I got them (Leeds Radio, maybe?). Bright yellow plastic, nice and flexible. I bought four of 'em, I could send you one.

- John

[Instrument Resources of America]

Have you thought about changing it over to the current style??   Ira.

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[John Rehwinkel]

For reference, these are the cords I have:

I also managed to chase down where I got them (in 2008, I posted to Neonixie about it):

http://www.leedsradio.com/parts-odds.html

Look for "Belden/Western Electric cord".  They were $10 in 2008, they're $15 now.

- John

[Mac Doktor]

> On May 7, 2019, at 10:28 AM, 'Greg P' via neonixie-l <neoni...@googlegroups.com> wrote:
>
> Anyone know where I can find a power cord for an old HP Frequency Counter that I just got. Seems these have been obsolete for a while and Belden doesn't make them anymore.
>
> I've checked Ebay and some are stupid expensive, almost as much as I paid for the counter.

As you can see there are two versions of the same cord with Hot and Neutral reversed. The HP version is "backwards".

I paid through the nose to get two of the HP type from eBay a couple of years ago. The last time I looked Sphere had some but their shipping from Canada is enormous.

Where did you find the picture?


Terry Bowman, KA4HJH
"The Mac Doctor"

[Shaun Merrigan]

I think Walter at Sphere Research had some.  Might be worth an email.

https://www.sphere.bc.ca/

Shaun M

Sent from my iPad6

No Regret

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[gregebert]

3D printer is very handy for things like this.

[David Forbes]

I have access to dozens of these, for free. Send me an email da...@cathodecorner.com

On Tue, May 7, 2019, 10:44 AM gregebert <greg...@hotmail.com> wrote:

3D printer is very handy for things like this.

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[Greg P]

Thanks that would be great.....I'll send you a private message.

On Tuesday, May 7, 2019 at 1:50:24 PM UTC-4, nixiebunny wrote:

I have access to dozens of these, for free. Send me an email da...@cathodecorner.com

On Tue, May 7, 2019, 10:44 AM gregebert <greg...@hotmail.com> wrote:

3D printer is very handy for things like this.

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[John DeArmond]

Hey Greg,

I have an excellent HP counter that I just couldn't bear to modify so I
still have one such cord.  On the rest of my instruments, I've been able
to find non-EMI filter IEC connector that could be made to fit with a
little nibbler work.  There's usually enough room in those old machines
for those short non-EMI sockets.

The worst I've ever had to do was fabricate a cover plate for the old
style socket and cut an IEC socket elsewhere on the back panel.

John

[David Speck MD]

Greg,

I ready source for compact unfiltered IEC power inlet sockets is dead PC
power supplies.  I find those often enough in the recycling bins.

Dave

[Richard Arndt]

You might try a call to SkyCraft Surplus.  They have been around since the 70's.

On Tuesday, May 7, 2019 at 10:28:50 AM UTC-4, Greg P wrote:

Anyone know where I can find a power cord for an old HP Frequency Counter that I just got.  Seems these have been obsolete for a while and Belden doesn't make them anymore.

I've checked Ebay and some are stupid expensive, almost as much as I paid for the counter.

This is the style...Any leads would be gratly appreciated

[martin martin]

Skycraft is a great site!  To bad it's 3,000 miles from me.  Better to visit in person I'll bet.

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[Mark Moulding]

Well, that's interesting!  I got an old HP 130C 'scope in a pallet of surplus gear, which is in very good condition and works; my plan is to restore it to as close to factory-new as I can.  I powered it with clip leads for a while, until the (irritatingly expensive) eBay power cord arrived, which of course works fine.  However, now I'm worried that the hot and neutral are swapped...  If so, I guess I'll have to track down the correct cord.  (According to the schematic, it should be safe to operate this way - although the hot side is switched and fused, neither side connects to the chassis in any way.)

~~
Mark Moulding

[gregebert]

If this instrument is dual-voltage for 120/240VAC operation, there should not be any issue with hot/neutral being swapped because both leads are hot in the high-voltage case.

[Bill Notfaded]

It's funny that you brought this up Greg because I just encountered a very similar problem.  I needed an even rarer power cord that looks the same but isn't.  I thought they were the same but after more research found out the distance and arrangement of the 3 pin are different.  It's the power cord for a handful of heath devices.  I had to get this cable for this frequency counter:

It wasn't cheap... I considered just replacing the whole thing but then it was nice enough I didn't want to change it...

B

[Mac Doktor]

> On May 8, 2019, at 3:56 PM, gregebert <greg...@hotmail.com> wrote:
>
> If this instrument is dual-voltage for 120/240VAC operation, there should not be any issue with hot/neutral being swapped because both leads are hot in the high-voltage case.

I have a Systron Donner frequency counter with an integral cord that's 120V only. Some idiot chopped the ground pin off. With it plugged in and turned OFF I can feel a tingle when I touch the case. I measure 54V RMS from the case to ground.

I asked a friend who's an EE about it and he told me that the EMI filtering contains resistors from both hot and neutral to ground. In his words, "Put a damn grounded plug on it!" I installed a new grounded plug and the tingle is gone. Zero volts from case to ground.

I'll post some pictures of it later.

[David Pye]

Wondered, looking at the photo, if you could manufacture one our of ring crimp connectors and potting compound, given a suitable mould ...

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[Bill Notfaded]

There has been talk over the years of remanufacturing them again but it's never happened... yet!

Bill

[gregebert]

It's probably the capacitance. And yes, it's enough of a shock to scare you and reflexively drop something valuable.

I found this out the hard way; LC-filter in a metal box did a great job getting rid of line noise.

This would never pass today's regulatory requirements, and it probably would cause a GFCI to trip.

Connecting a resistor from the AC neutral to the chassis was done on many TV sets from the 1960's; RCA and Zenith had a 22meg resistor for bleeding-away charge on the metal chassis. And this was NOT one of the infamous hot-chassis sets. I suspect it had to do with exposed metal parts getting capacitively charged via the picture tube; with the resistor the current was very small (well-below threshold of sensation) even if hot and neutral got swapped.

[Charles MacDonald]

On 2019-05-09 5:51 p.m., Bill Notfaded wrote:
> There has been talk over the years of remanufacturing them again but
> it's never happened... yet!

Wonder if they would no longer meet the Electrical standards - I have
some projectors which have a connector which has 2 prong blades like a
power cord, recessed in a round opening. The Old cords that came with
them look just like an extension cord and Just clear the opening.
modern cords have to be quite a bit larger so that one cannot bypass the
ground pin.

[martin martin]

I think it's time to cut the old ones out and solder in a new PC cord with the ground where you know where it's at..

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[Mac Doktor]

On May 9, 2019, at 7:08 PM, gregebert <greg...@hotmail.com> wrote:

Connecting a resistor from the AC neutral to the chassis was done on many TV sets from the 1960's; RCA and Zenith had a 22meg resistor for bleeding-away charge on the metal chassis. And this was NOT one of the infamous hot-chassis sets. I suspect it had to do with exposed metal parts getting capacitively charged via the picture tube; with the resistor the current was very small (well-below threshold of sensation) even if hot and neutral got swapped.

I'm guessing we're both old enough to remember cheater cords?

When my dad was a teenager my grandfather serviced TV sets. Naturally he has lots of stories about walking into someone's living room and knowing instantly which tube was bad.

He later became a banker and repo-ed lots of cars but his first time was when he was only 16 or 17. It was a TV antenna.

Terry Bowman, KA4HJH
"The Mac Doctor"

"I've seen things you people wouldn't believe: attack ships on fire off the shoulder of Orion... beams...in the dark in the Tannhauser Gate. All those moments will be lost in time...like tears in the rain." — Roy Batty, Blade Runner

[Mac Doktor]

I promised a picture...

On May 9, 2019, at 4:33 PM, Mac Doktor <themac...@gmail.com> wrote:

I have a Systron Donner frequency counter with an integral cord that's 120V only. Some idiot chopped the ground pin off. With it plugged in and turned OFF I can feel a tingle when I touch the case. I measure 54V RMS from the case to ground.

I asked a friend who's an EE about it and he told me that the EMI filtering contains resistors from both hot and neutral to ground. In his words, "Put a damn grounded plug on it!" I installed a new grounded plug and the tingle is gone. Zero volts from case to ground.

I'll post some pictures of it later.

And here it is:

Up next: video of the counter in operation.

Terry Bowman, KA4HJH
"The Mac Doctor"

"If only you could see what I've seen with your eyes."—Roy Batty, Blade Runner

[martin martin]

I definitely want to see it in operation.  

I’ll fire up the counter timer too!

M

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