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
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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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Re: 8566B 1dB scale trace not linear at bottom of screen
I remember there being a variable resistor with fixed resistors that needed to be changed only if the variable did not provide enough range. Think I'd read a bit more B4 proceeding.
Cheers!
Bruce
Quoting DW <wilson2115@...>:
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I found the 1dB adjustment in the manual
The 1dB step adjustment procedure in the manual involves fixed resistors which I must swap to adjust, the test calls for clipping the trace on the top of the screen and measuring the amount it supposed to go over. I don't believe I noticed anything unusual before with the trace clipped so I think that is ok.
10. Step Gain and 18.4 Mhz Local Oscillator Adjustments
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Hi!
I am selling two sig-gens and constellation analyzer:
- 8656A uncal, some scratches, no option, working fine, accurate and clean wave generation. 4 key springs missing, but working fine. Original operation and service manual included
- 8657J sealed, calibrated, combo with pi/4 dqpsk modulator, perfect working and cosmetic conditions
- 3709B himself (bright crt, very clean, working fine but uncal) plus operation & service original manuals (the service is vhtf), 15709A impedance adapter, siemens 1.6-5.6 to bnc adapters, and handle & standoff feet kit.
I am from Madrid, Spain. PM me if you are interested for photos and so.
Regards,
R.
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HP 11708A Reference Attenuator
Hello, I luck to found one HP 11708A Reference Attenuator for the 8484A power sensor, one god 30dBm attenuator is ok to use?
Thank you for your help.
Francesco.
G7OYO
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Looking for a handbook/service manual for same- ebay prices far too steep. A
pdf would be fine- but it's not listed at Artek.
DaveB, NZ
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Re: 8566B 1dB scale trace not linear at bottom of screen
I found the 1dB adjustment in the manual
The 1dB step adjustment procedure in the manual involves fixed resistors which I must swap to adjust, the test calls for clipping the trace on the top of the screen and measuring the amount it supposed to go over. I don't believe I noticed anything unusual before with the trace clipped so I think that is ok.
10. Step Gain and 18.4 Mhz Local Oscillator Adjustments
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Re: A bit OT: simulators for children
I dunno, maybe by the time I got them in the mid to late 1970's they were either not making them like they used to or I was too advanced by then to be all that interested.? ? ? ? ?Jim Ford?
Sent from my Verizon, Samsung Galaxy smartphone
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-------- Original message -------- From: "sholland via groups.io" <sholland@...> Date: 6/8/21 1:21 PM (GMT-10:00) Subject: Re: [HP-Agilent-Keysight-equipment] A bit OT: simulators for children
Things of Science. Yeah, absolutely brilliant kits of various things covering all sorts of science topics. Loved getting it as a kid. Those little blue boxes were eagerly opened and the educational topics were eagerly consumed.?
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Re: 8566B 1dB scale trace not linear at bottom of screen
As I remember, it is easy, but there are several adjustments that should be done B4 if you want the thing to be overall accurate. I think you can just touch up the attenuation and get off with out touching the LOG amp or VIDEO amp adjustments. These are a bit more time consuming.
Cheers!
Bruce
Quoting DW <wilson2115@...>:
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The replies are appreciated.
I will study the manual and if it is simple I will attempt to adjust it.
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Re: 8566B 1dB scale trace not linear at bottom of screen
The replies are appreciated.
I will study the manual and if it is simple I will attempt to adjust it.
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Re: A bit OT: simulators for children
Things of Science. Yeah, absolutely brilliant kits of various things covering all sorts of science topics. Loved getting it as a kid. Those little blue boxes were eagerly opened and the educational topics were eagerly consumed.?
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Re: 8566B 1dB scale trace not linear at bottom of screen
I just ran that scenario on my 8566B and the trace does not start to fall off but tracks the sig gen output all the way.?
Same here with 10MHz output from my HP 8665A.
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Re: 8566B 1dB scale trace not linear at bottom of screen
I just ran that scenario on my 8566B and the trace does not start to fall off but tracks the sig gen output all the way.?
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On Jun 8, 2021, at 4:20 PM, DW <wilson2115@...> wrote:
?Here is a thought, if someone with a 8566 could reproduce my results by injecting a -20dBm 10 Mhz signal and setting the reference level to -20dB and set the scale to 1dB. Then with the signal generator start dropping the signal from -20dBm to -30dBm in 1dB increments. Does the trace start to fall off towards the bottom of the screen compared to 2dB and 5dB?
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The following files have been uploaded to
the Files area of the [email protected] group.
By: Ken Eckert <eckertkp@...>
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You might check the catalog at probemaster.com
These are not Agilent/HP probes, but their own OEM designs, but there's some chance that they will have accessories which will fit your probes.? I found, a few years ago, that their screw-in probe tips are a good fit for the probes on the venerable HP 8405A vector voltmeter (and are much less expensive than new-old-stock HP).
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Gerard
Paul Bicknell
RubenRubio
Francesco
Steve Holland