Re: HP 3457A mains voltage setting
On Wed, Jun 9, 2021 at 12:12 PM, cheater cheater wrote:
Crap... does that mean I need a different fuse holder before I can
start using this? The unit came from the US and I am in Europe.
--- Most likely the fuse inside is a standard fuse. Just push the cap in with a flat screwdriver and rotate counterclockwise to remove and inspect the fuse. If you want you can paint the fuse holder cap black with a permanent marker?to match the original color for 220/240V (gray->110/120V, black->220/240V) after placing the correct fuse. Ozan
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Re: Hp8558b spectral analyzer (2/2)
The capacitor in the original input assembly will block DC from reaching the attenuator.
Yours may have been damaged by having DC or excessive RF level applied to the input.
The attenuator should measure 50 ohms resistance because it is constructed of resistive divider elements.
This is a common problem.? There are numerous articles on-line that show how to check and repair these attenuators.
Such as:?
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Re: Verifying HP905A Sliding Load - request for further technical specs
Hello Dave,
Thank you for your answer. I've this manual but (unfortunately) the
information about phase slope and reflection group delay are not included and
the drawings contain no tolerances.
In that case someone owns such a sliding load and has the capability to
measure it, it would be helpful.
Our old 905A meets the SWR spec but the phase slope isn't linear as expected
and it doesn't change well by moving the slider. Each part has been cleaned
and inspected - similar to other sliding loads - and damages/scratches/etc.
are not visible. But the measurements show visible ripple and some phase jumps
- it requires more attention.
Best regards,
Stephan
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On Mittwoch, 9. Juni 2021 20:20:18 CEST you wrote: On 6/9/21 1:56 PM, Dr.-Ing. Stephan Massner via groups.io wrote:
I would verify some of our 'old' calibration equipment and my question is:
Does anybody have the spec sheet from the HP905A sliding load (1.8-18GHz)?
I'm interested in the following data:
- phase slope for lower/upper sliding position
- reflection group delay (max value)
- drawings (including tolerances) The service manual for the 905A is available here:
-Dave
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Re: Capturing screenshots on 8934C
Hi, For the 8924C, you must have a special cable to use it with the BTS software. Have you this cable? Wiring is OK? Printer config set to DESKJET ? BTS software and cable to have for 8924C ? . ? Otherwise, the 8924C does not seem to have a plotter function (HPGL image file), but only a printer function according to the little information I have. If there had been a possibility of an HPGL image, it would have been relatively simple. ? The BTS software should have worked, but I will see using another hp instrument, which has the printer DESKJET configuration if I can decode and retrieve an image. ? Yves ? ? I have the BTS laptop utility. It works perfectly on my 8935, but I can't get it to work on the 8924. I use the 8924 more because of it's auto-ranging feature.
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Re: HP 3457A mains voltage setting
It just means that you need to change the switch position and change the fuse itself, NOT the fuseholder.
Richard
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Crap... does that mean I need a different fuse holder before I can
start using this? The unit came from the US and I am in Europe.
On Wed, Jun 9, 2021 at 7:34 PM Ozan <ozan_g@...> wrote:
>
> On Wed, Jun 9, 2021 at 09:26 AM, cheater cheater wrote:
>
> Hi all, I've noticed that my 3457A has two settings for the mains
> voltage. One is a circular selector with a flat head screwdriver slot,
> the other is a pair of sliders. I need to change it from US to Europe.
> Should I be changing both? Do I need to change anything else? (eg
> fuse?)
>
> Thanks a lot
>
> Looking at a picture of 3457A, circular one is the fuse holder. The picture I found says 80mA for 220/240 and 200mA for 100/120mA next to it, in consistent with the message from "tmillermdems".
> Ozan
>
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Re: HP 3457A mains voltage setting
Crap... does that mean I need a different fuse holder before I can
start using this? The unit came from the US and I am in Europe.
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Show quoted text
On Wed, Jun 9, 2021 at 7:34 PM Ozan <ozan_g@...> wrote:
On Wed, Jun 9, 2021 at 09:26 AM, cheater cheater wrote:
Hi all, I've noticed that my 3457A has two settings for the mains
voltage. One is a circular selector with a flat head screwdriver slot,
the other is a pair of sliders. I need to change it from US to Europe.
Should I be changing both? Do I need to change anything else? (eg
fuse?)
Thanks a lot
Looking at a picture of 3457A, circular one is the fuse holder. The picture I found says 80mA for 220/240 and 200mA for 100/120mA next to it, in consistent with the message from "tmillermdems".
Ozan
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Re: Hp8558b spectral analyzer (2/2)
Hello,
NJ902, please?Can you be more specific
What¡¯s a DC block?
For me a capacitor dont't indicate 0 ohm?
What is excatly the impedance of the attenuator?
If someone have a HP8558B analyzer and put un ohmeter on the N plug, what is the result: Infinite, 50 ohms, other????
Without specific cases of measurement I do not move forward
You said: ""The attenuator input section appears to be damaged,"
Why???
cdt
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Re: Hp8558b spectral analyzer (2/2)
The purpose of the capacitor in the input assembly would be a DC block.
It appears that the input assembly was changed on your unit.
The attenuator input section appears to be damaged,
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Re: Verifying HP905A Sliding Load - request for further technical specs
On 6/9/21 1:56 PM, Dr.-Ing. Stephan Massner via groups.io wrote: I would verify some of our 'old' calibration equipment and my question is:
Does anybody have the spec sheet from the HP905A sliding load (1.8-18GHz)?
I'm interested in the following data:
- phase slope for lower/upper sliding position
- reflection group delay (max value)
- drawings (including tolerances) The service manual for the 905A is available here: -Dave -- Dave McGuire, AK4HZ New Kensington, PA
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Verifying HP905A Sliding Load - request for further technical specs
Dear all,
I would verify some of our 'old' calibration equipment and my question is:
Does anybody have the spec sheet from the HP905A sliding load (1.8-18GHz)?
I'm interested in the following data:
- phase slope for lower/upper sliding position
- reflection group delay (max value)
- drawings (including tolerances)
Thanks in advance.
Best regards,
Stephan
|
Re: HP 3457A mains voltage setting
On Wed, Jun 9, 2021 at 09:26 AM, cheater cheater wrote:
Hi all, I've noticed that my 3457A has two settings for the mains
voltage. One is a circular selector with a flat head screwdriver slot,
the other is a pair of sliders. I need to change it from US to Europe.
Should I be changing both? Do I need to change anything else? (eg
fuse?)
Thanks a lot
Looking at a picture of 3457A, circular one is the fuse holder. The picture I found says 80mA for 220/240 and 200mA for 100/120mA next to it, in consistent with the message from "tmillermdems". Ozan
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Re: HP 3457A mains voltage setting
On 6/9/2021 12:25 PM, cheater cheater
wrote:
Hi all, I've noticed that my 3457A has two settings for the mains
voltage. One is a circular selector with a flat head screwdriver slot,
the other is a pair of sliders. I need to change it from US to Europe.
Should I be changing both? Do I need to change anything else? (eg
fuse?)
Thanks a lot
|
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Re: HP 3457A mains voltage setting
Not certain about the settings (shouldn't it be in the manual?) but the fuse is generally 1/2 the 120 volt rating, and should be listed on the back.? I know that Tek generally has a "gross" setting, 120/240 and then a low/med/high adjustment for variations within that range.? For USA 120 volts, you generally want the high setting.
I'd suspect that HP did much the same, it makes too much sense.
Harvey
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On 6/9/2021 12:25 PM, cheater cheater wrote: Hi all, I've noticed that my 3457A has two settings for the mains
voltage. One is a circular selector with a flat head screwdriver slot,
the other is a pair of sliders. I need to change it from US to Europe.
Should I be changing both? Do I need to change anything else? (eg
fuse?)
Thanks a lot
|
Re: Hp8558b spectral analyzer (2/2)
Re,
I just disconnected the cable to the attenuator inlet.
there is no short circuit between the shield and the core
On the other hand, the connection is direct (0 ohm) between the N socket input and the end of the core.
So in fact I have trouble understanding the role of the capacitor (no 4)
Also: If I plug an ohmeter on the input of the attenuator I have an infinite impedance. Idem by moving the switch boutton. I don¡¯t know if that¡¯s normal, too, because we¡¯re still talking about 50 ohm impedance?
some ideas,
cdt
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Running the Agilent vintage PDNs below 300KHz
I am curious what limits the E835xA PDNs to 300KHz and if there is a way to override it, with the understanding that the performance would be reduced???
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Re: Hp8558b spectral analyzer (2/2)
Paul, thank's for your answer. That¡¯s the problem, I¡¯ve never been able to display a signal with the RF plug.In fact, my first question was whether this catch was smeared because you can¡¯t see the silkscreens. There was supposed to be a BNC. It seems to be well connected to the attenuator input.
for display something:
That¡¯s the problem, I¡¯ve never been able to display a signal with the N RF plug.In fact, my first question was whether this catch was smeared because you can¡¯t see the silkscreens. There was supposed to be a BNC. It seems to be well connected to the attenuator input
My second question was also to know which positions should be the main buttons to display a 20MHZ AM signal with a voltage of 0.3V.I¡¯ve tested many combinations, we don¡¯t show any signal. Some ideas?
Indeed, by chance when I connected the calibration output to the LO socket, I display something. I know that¡¯s not the way it¡¯s supposed to work, it¡¯s really strange. It proves that some things work.
Normally input cable must be do like that (I thing)
on my analyzer it's like a small aluminium coaxial cable (2/3 mn diametral) from RF N input to the attenuator.
So the capacitor and other are directly on the plug and i don't see it? Capacitor burn???
I¡¯m going to test this cable, even if it means injecting a signal directly into the attenuator input with a 0.1 ?f capacitor whith a small signal?
cdt
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HP 3457A mains voltage setting
Hi all, I've noticed that my 3457A has two settings for the mains
voltage. One is a circular selector with a flat head screwdriver slot,
the other is a pair of sliders. I need to change it from US to Europe.
Should I be changing both? Do I need to change anything else? (eg
fuse?)
Thanks a lot
|
Re: Hp8558b spectral analyzer (2/2)
Hi ? From the video it appears you are not putting the test signal into the ?RF input ??why? ?? ? Also best advice is to get? a few adapters and leads rather than putting signals in with a bit of wire ? Regards Paul?
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From: [email protected] [mailto:[email protected]] On Behalf Of Gerard
Sent: 08 June 2021 21:25
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] Hp8558b spectral analyzer (2/2) ? Hello,?
as i saw, i nether see anyfing on the screen os the HP 182T.
Except!!!? Look at the vid¨¦o...very strange
All is good connected.? The input N go to the block attenuator
some id¨¦as??
cdt
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Re: Capturing screenshots on 8934C
I have the BTS laptop utility. It works perfectly on my 8935, but I can't get it to work on the 8924. I use the 8924 more because of it's auto-ranging feature.
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Re: 8566B 1dB scale trace not linear at bottom of screen
Good advice Bruce, this is my initial findings, I will study more carefully.
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Gerard
Dave McGuire
Paul Bicknell