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  1. HP-Agilent-Keysight-Equipment
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Date
Re: display tilt adjustment hp8591a

 

Hi Wilko,

You are right, CRT screens are sensitive to the environment; steel, magnetic
field of other devices if they are nearby, gravity...but I found the cause.

When I noticed the display problem, I was working on the RF sections and was
concentrating on them.
I think I wasn't paying enough attention.
What I thought was a tilt reversal was perhaps the orientation of the
spectrum, as I regularly changed the instrument's orientation for testing.

Why I say this is that I disassembled everything and placed the display on
the table.
The deflection coils were very stable and glued; they couldn't move.
So, I think I made an observation error regarding the tilt reversal.

I took the measurement with a ruler, and the display was straight.
The metal casing covering this section had been removed before this
measurement, and I demagnetized it, along with all the circuits, before
reassembling.

But when I disassembled it, I noticed that this section had already been
disassembled and unfortunately reassembled incorrectly, and the case
covering the CRT was misaligned, as was the outer frame for the display,
which wasn't properly seated.

I corrected everything, and now my screen is straight.

The positioning of the metal case and the outer frame caused the tilt.
The metal case containing the display was screwed tightly on the left side,
but barely on the right side.
Therefore, the right side was slightly raised above the aluminum frame,
causing the tilt.

Yves

-----Message d'origine-----
De?: [email protected]
<[email protected]> De la part de Wilko Bulte via
groups.io
贰苍惫辞测é?: 22 mars 2025 03:39
??: [email protected]
Objet?: Re: [HP-Agilent-Keysight-equipment] display tilt adjustment hp8591a

You do not per chance have a steel workbench or similar? As I have found out
the hard way ages ago (i.e. during my education) such an environment can
affect tube trace alignment.
Rotating the monitor on the desk made the picture change. Had me puzzled for
quite a while, even more so because in my case it was a colour CRT.

Wilko
Re: display tilt adjustment hp8591a

 

You do not per chance have a steel workbench or similar? As I have found out the hard way ages ago (i.e. during my education) such an environment can affect tube trace alignment.
Rotating the monitor on the desk made the picture change. Had me puzzled for quite a while, even more so because in my case it was a colour CRT.

Wilko
Re: Retrofitting 3.5mm connector from HP 8485A sensor onto an existing HP 8481A sensor - possible?

 

On Thu, Mar 20, 2025 at 11:50 PM, Sven Schnelle wrote:
But exactly as you said, the
levels where low by at least 3dB above 19GHz.

?

?
I can see that... as N-connectors...say, precision ones... they might go to 25 or 26 GHz...but N connectors are usually to 18 GHz, where... AFAIK...TE11 can start happening.
?

The 85025A... with an N connector... is spec t to about 18 GHz... if I recall correctly.
?

For frequencies beyond 18 GHz, 3.5 mm, 2.92 mm (K), or SMA connectors are preferred...AFAIK.
I've never tried an 805025A past 20 GHz; but I'm surprised the N connector maintains TEM... and if it goes to TE11... then 'works to 40 GHz" doesn't make sense to me.
Re: display tilt adjustment hp8591a

 

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Pat,

?

I had thought about that too, but when I received it, the curve was reversed on the other side with an even larger angle.

Then after a power cycle, the screen looked like what the image shows and nothing has moved since…but I had moved the instrument.

I tried to shake the instrument a little, but nothing moves, I had thought then of a possible intermittent adjustment.

But you are probably right, I will have no choice but to remove everything and try to find a way to make the adjustment when the device is powered on.

?

Thank you for replying.

Yves

?

De?: [email protected] <[email protected]> De la part de Cubdriver via groups.io
贰苍惫辞测é?: 21 mars 2025 18:33
??: [email protected]
Objet?: Re: [HP-Agilent-Keysight-equipment] display tilt adjustment hp8591a

?

Yves -?

I suspect that's likely a magnetically deflected display, like a television, and has a deflection yoke on the CRT neck that's somehow managed to get rotated slightly.

-Pat



?
Re: display tilt adjustment hp8591a

 

Yves -?

I suspect that's likely a magnetically deflected display, like a television, and has a deflection yoke on the CRT neck that's somehow managed to get rotated slightly.

-Pat



?

> ------ Original Message ------
> From: yves_tardif@...
> To: [email protected]
> Sent: Friday, March 21st 2025, 06:03 PM
> Subject: [HP-Agilent-Keysight-equipment] display tilt adjustment hp8591a
?

Hi,

?

I repaired an 8591A for a friend, but the display on his screen isn't perfectly straight.

I'm guessing there's an adjustment for that, but where is that adjustment?

There are adjustments on the top for intensity, frequency, green gain, and horz.

Coarse focus on the back, and focus on the side.

I haven't attempted to remove the display yet.

?

Yves
display tilt adjustment hp8591a

 

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Hi,

?

I repaired an 8591A for a friend, but the display on his screen isn't perfectly straight.

I'm guessing there's an adjustment for that, but where is that adjustment?

There are adjustments on the top for intensity, frequency, green gain, and horz.

Coarse focus on the back, and focus on the side.

I haven't attempted to remove the display yet.

?

Yves
Re: 33210A load waveform over Ethernet

 

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Glad I could help you.

?

Yves

De?: [email protected] <[email protected]> De la part de Peter Gottlieb via groups.io
贰苍惫辞测é?: 21 mars 2025 17:26
??: [email protected]
Objet?: Re: [HP-Agilent-Keysight-equipment] 33210A load waveform over Ethernet

?

Thank you so much!? This is exactly what I need!

Peter
Re: 33210A load waveform over Ethernet

 

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Thank you so much!? This is exactly what I need!

Peter


On 3/21/2025 1:52 PM, Yves Tardif via groups.io wrote:

Hi Peter,

?

I don’t have 33210A, but it’s same thing with an 33220A.

?

I used the free Agilent IntuiLink Waveform Editor software.

In the File Properties menu, I chose the number of points; here it was 10,000.

I added some basic shapes to get 10,000 points.

?

I sent everything to volatile memory for testing (you can choose volatile or non-volatile). The frequency was 1 kHz and 1 Vpp.

?

The generator's mode is ARB, with BURST mode enabled; choose 1 cycle only.

?

Trigger setup: set it to manual mode.

?

You can trigger manually by pressing the TRIG button, or send the GPIB command *TRG

?

Yves

?

?

?

?

?

?

?

-----Message d'origine-----
De?: [email protected] <[email protected]> De la part de Peter Gottlieb via groups.io
贰苍惫辞测é?: 21 mars 2025 09:02
??: [email protected]
Objet?: [HP-Agilent-Keysight-equipment] 33210A load waveform over Ethernet

?

Just wondering if anyone has experience loading a one-shot retriggerable waveform over Ethernet into a 33210A arbitrary waveform generator.

?

I'd love to hear the Reader's Digest version of how I can do this.

?

I need 10k points at a rate of 1 or 10 kHz.

?

Peter

?

?

?

?
Re: OPT 003 (48-440 Hz compatible) fan (full size "Muffin" type fan) - replacement requirements?

 

Have both 8660B and 8660C; I was aware of the thermal issues with the 8660B (I believe it was in the pre-LSTTL era as I understand). It lives in a basement (lowest floor) workshop and fortunately is not on for long periods of time nor subject to ambient above about 70F.

The 8660B accepts regular 60 Hz fan and I ordered a couple of "high speed dual ball bearing 120x38mm 120VAC" fans so that when these things are next on the workbench I'll have spare ready.

As for the 8673D/003, I wasn't aware of the specifics of 400 Hz capable fan; most likely I'll see if I can add supply wires back to the switched 120VAC side of primary transformer (or however the 8673D normally gets power for it's upper assembly cooling fan, which should be revealed by the service manual (which is in competition for the heaviest service manual I've ever seen.)

Thanks again, much appreciate the comments!
Re: Retrofitting 3.5mm connector from HP 8485A sensor onto an existing HP 8481A sensor - possible?

 

After doing some testing yesterday, I discovered that the 8481A that was to be the recipient of the dead 8485A's connector etc. assembly was itself dead (8481A won't zero and responds about 20 dB down incident signal, so dynamic range is something like 20 dB, not 50 dB.) I don't immediately recall the 8481A's history, however, I thought I had stored it away in working condition (and I'm the only person that would have access to it.) Given that unexpected result, and the current-era prices for used 8481A, my project idea won't be able proceed. So all that said, I'm going to keep eye out for 8485A (basically as a reference against which to calibrate 8673D synthesized signal generator.)

Thanks again for the contributions to the question, it is very much helpful.
Re: Retrofitting 3.5mm connector from HP 8485A sensor onto an existing HP 8481A sensor - possible?

 

I think it is likely to work - BUT, the assembly and disassembly will be (at lest) challenging.
?
The thermistors may be similar, and possibly the thermistor board in the cartridge (you need to check this carefully before you start.? If the cartridge are the same, it would be straight forward,? if only the thermistor board is the same it will be a bit more difficult.? It might be reasonable o pick up a dead 8481 to practice disassembly on.
?
HP did sell the cartridges some time ago but they found that many attempts to replace the cartridges resulted in damage to the matching components in the head.
?
I would look carefully at the part list for the 8485 to get an idea as to how difficult the disassembly / reassembly will be.? It is relatively easy to get the cartridge out of the 8481,??
?
keep us posted as to how it works out - pictures would be very desirable.
Re: 33210A load waveform over Ethernet

 

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Hi Peter,

?

I don’t have 33210A, but it’s same thing with an 33220A.

?

I used the free Agilent IntuiLink Waveform Editor software.

In the File Properties menu, I chose the number of points; here it was 10,000.

I added some basic shapes to get 10,000 points.

?

I sent everything to volatile memory for testing (you can choose volatile or non-volatile). The frequency was 1 kHz and 1 Vpp.

?

The generator's mode is ARB, with BURST mode enabled; choose 1 cycle only.

?

Trigger setup: set it to manual mode.

?

You can trigger manually by pressing the TRIG button, or send the GPIB command *TRG

?

Yves

?

?

?

?

?

?

?

-----Message d'origine-----
De?: [email protected] <[email protected]> De la part de Peter Gottlieb via groups.io
贰苍惫辞测é?: 21 mars 2025 09:02
??: [email protected]
Objet?: [HP-Agilent-Keysight-equipment] 33210A load waveform over Ethernet

?

Just wondering if anyone has experience loading a one-shot retriggerable waveform over Ethernet into a 33210A arbitrary waveform generator.

?

I'd love to hear the Reader's Digest version of how I can do this.

?

I need 10k points at a rate of 1 or 10 kHz.

?

Peter

?

?

?

?
Re: OPT 003 (48-440 Hz compatible) fan (full size "Muffin" type fan) - replacement requirements?

 

If it is from a 8660, don't be tempted to go with a lower power fan, HP had some reliability problems with early 8660A & 8660B, this lead to them offering a free upgrade to a larger size fan in 1974 to improve the cooling;
?
David
Re: OPT 003 (48-440 Hz compatible) fan (full size "Muffin" type fan) - replacement requirements?

 

Robert, Adrian - thank you both for adding to discussion - this information helps because I also have OPT 003 in old HP 8660 series synthesizer (also very heavy machine) so good to have these options.
33210A load waveform over Ethernet

 

Just wondering if anyone has experience loading a one-shot retriggerable waveform over Ethernet into a 33210A arbitrary waveform generator.

I'd love to hear the Reader's Digest version of how I can do this.

I need 10k points at a rate of 1 or 10 kHz.

Peter
Re: OPT 003 (48-440 Hz compatible) fan (full size "Muffin" type fan) - replacement requirements?

 

The difference with the option 003 is that a DC fan is fitted rather than the mains (50/60 Hz) AC one in the standard unit. This give you more choice of replacment fan. Take the old one out and see what model it is. Any modern DC fan of the right size and voltage will work.
The OPT 003 fan can't be a 400Hz unit because it still has to run at 48Hz. There is no such thing as a 48Hz to 400Hz AC fan (unless it is really a DC fan with built in power supply).? I've actually used / installed HP and Tektronix kit on aircraft using the 400Hz supply.?
?
Robert G8RPI
Re: How to recover the video of my graphic 54810-66505 card

 

hello,
?
Does anyone have the schematic of card 54810-66505? (Video pci card)
This prevents the motherboard from starting up.
The same with other motherboard
thank you
Re: OPT 003 (48-440 Hz compatible) fan (full size "Muffin" type fan) - replacement requirements?

 

What is the problem with it? I had a very noisy one of these fans and any 400Hz capable replacement was very expensive. In the end I simply took the old one apart and replaced the two bearings.
They were standard imperial sized units that were available from stock here in the UK, reassembled and all was well, took about an hour and even with top quality bearings (SKF) the cost <15 GBP.
Re: Retrofitting 3.5mm connector from HP 8485A sensor onto an existing HP 8481A sensor - possible?

 

"F1EKU via groups.io" <rfconsulting.fr@...> writes:

From experience, the 8481A series does not perform up well beyond 18
GHz. The response drops very quickly towards 19/20
GHz, and at 26.5 GHz, the response difference is more than 3 to 4
dB. The N connector is not responsible for this poor
performance, as 85025A detectors easily perform up to 40 GHz with only
a few glitches due to VSWR beyond 18.6 GHz.
Conversely, an 8485A often performs up to 30 or even 33 GHz.
I can confirm that. Last week i tried to do flatness calibration on my
83752A sweeper. As i only have a 8485D that accepts a max input level
of -20dBm, i tried the 8481A instead. But exactly as you said, the
levels where low by at least 3dB above 19GHz.
Re: A homemade diode power sensor for HP meters

 

Hi Jeff:
Isn't this a years old thread?
Did this home brew power sensor project go anywhere, in the mean time?
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