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Re: A bit OT: simulators for children

 

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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

-------- 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.?

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@...>:

The replies are appreciated.

I will study the manual and if it is simple I will attempt to adjust it.
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.
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.?
Re: 8566B 1dB scale trace not linear at bottom of screen

 

On Tue, Jun 8, 2021, 6:29 PM Steve - Home <steve-krull@...> wrote:
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.
Re: 8566B 1dB scale trace not linear at bottom of screen

 

¿ªÔÆÌåÓý

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.?

Steve
WB0DBS



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?

2 files uploaded #file-notice

[email protected] Notification
 

The following files have been uploaded to the Files area of the [email protected] group.

By: Ken Eckert <eckertkp@...>
Re: Scope Probe parts

 

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).
Re: 8566B 1dB scale trace not linear at bottom of screen

 

This is most probably an 8566 adjustment problem. Look over the adjustment procedure and you will find a section where the attenuators are adjusted. I'll try to find time to look up the exact section, but I remember doing this and correcting similar errors.


Quoting DW <wilson2115@...>:

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?
Re: 8566B 1dB scale trace not linear at bottom of screen

 

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?
Re: Capturing screenshots on 8934C

 

¿ªÔÆÌåÓý

Hi,

?

I found that for screen capture about 8924C?

?

BTS software

?

?

De?: [email protected] <[email protected]> De la part de w9dkc
·¡²Ô±¹´Ç²â¨¦?: 8 juin 2021 08:57
??: [email protected]
Objet?: Re: [HP-Agilent-Keysight-equipment] Capturing screenshots on 8934C

?

Sorry, yes. 8924C

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

Strange!!!.3gp
Strange!!!.3gp

Re: Hp8558b Spectral analyzer (1/2)

 

it's better with the files

Display frequency.3gp
Display frequency.3gp
Input.jpg

Hp8558b Spectral analyzer (1/2)

 

hello,

i have repard the displays
This analyzer never allowed me to display anything except once , with a generator and a 5v signal which is a bit strong

May you tell me if the?if the BNC connector has been replaced by an N. the plug information is not clearly visible? ---> see picture
May you tell me if the frequency scanning operation seems normal to you (I have repaired the displays)? --->see the vid¨¦o

Thank's for your returns

cdt
File Notifications #file-notice

[email protected] Notification
 

The following files have been uploaded to the Files area of the [email protected] group.

By: Ken Eckert <eckertkp@...>

The following files have been uploaded to the Files area of the [email protected] group.

By: Ken Eckert <eckertkp@...>
Scope Probe parts

 

Anyone have any good reasonably priced sources for scope probe parts?
Looking for hook tip for Agilent HP 1160 mini probe among other things.
The recent ebay listings seem to be missing the hook tip in the accessories cases.

Wally KC9INK
Re: Asking help to experienced people who repaired a 3585A spectrum analyzer

 

Hi Alberto,

no worries, one purpose of this forum is to contribute and share experience when someone is in trouble with a HPAK instrument, so just stay on.

I assume that you have checked that, on A34, the existence of the 100kHz clock signals around U9, 10, 14 and the signal at TP3, correct? Something happening at U15C, U3B? But not signs of life at TP2?
BTW, it is very helpful to go through the functional descriptions in Vol.I Section VI to understand what is happening inside the 3585A. If completed, check the following:
- fault isolation procedure in Vol.II from pg. 8-1 (hint about which loop is not locked on pg. 8-7)
- the LEDs indicate which loop might be affected, see Vol.II table 8-4 (pg. 8-10)
That should give you an indication about if the problem really is located on A34.

Chris
FS: Original Tek 576 Op/Serv Manual and Type 172 Programmable Test Fixture $US200.00 for both

 

The 576 manual is the August 1984 revision and in excellent condition.

The "Type 172 Programmable Test Fixture" for the 576 is in likewise excellent shape.

I want to sell them as a pair, they'll be shipped from Calgary, AB, Canada and UPS Ground into the ConUS I guess might run $US50-75.00, depending.

The 172 comes with a programming card and I swear up and down I have a slew of original pins and an extra couple of programming cards sitting in one those places where I'll be -sure- to be able to locate them. They're included once I do.

A cleaned up, OCR-d copy of the manual from the TekWiki is here:




PayPal pretty much works but for unknown "reasons" that I ascribe to brain dead AI it has begun randomly withholding payments into and transfers out of the account, so I'll ask that any payment be sent as, "Money to those you trust" or whatever they call it these days.

Hit me off list please at sales ¨C at ¨C pearl-hifi ¨C dot ¨C com

Liam

sales.vcf
sales.vcf

Re: Asking help to experienced people who repaired a 3585A spectrum analyzer

 

Hi Chris,

I just checked before the A21 unit, without pulling out it, according to the Service Group B of Section 11: when I started directly from the "Service" chapter, the "LOCAL OSC. UNLOCKED" error led me to that Group. By following the "Main Local Oscillator Troubleshooting Tree" (11-151/11-152), I found perfectly within the tolerances the following signals:
  • 90 MHz ¡À 10 Hz at A21J2
  • 10 MHz?¡À 2 Hz at A21J6
  • 100 kHz?¡À 2 Hz at A21J9
  • ¡Ý 1 V pulses at A21J8
and so on in the flowchart, choosing YES until the last decision block, where is asked if any LED of the A34 board is blinking: before the replacement of the 2N3055 in that board, the answer was NO, but now I don't know if the slow blinking of the FRN LED can be interpreted as "blinking" and I have to change the direction... The REF LED is off at power on, but becomes on after warmup: at that moment, the sounder, that follows the FRN LED, ceases beeping.

Now, by restarting from Section 5 - as you advised - the first step I should begin from is ¡ì 5-7 "90 MHz Reference Board Adjustment (A21)": in fact I just checked the voltages of the Low Voltage Power Supply and I should prefer to avoid checking its current protection. NB In Section 11 Group B the frequency counter and the RF synthesizer had to be externally sync'd to the 10 MHz reference output of the 3585A, but in Section 5 this is true only for the synthesizer (see ¡ì 5-5). Therefore I will sync the frequency counter to my GPSDO 10 MHz reference.

Last (by now): you wrote that in you troubleshooting you bought a second unit as donor, to help you focus the possible fault in case of multiple failures. I have not this possibility, unless buying certain replacement boards: it is a little expensive approach and meanwhile I got almost all the ICs of the A34 board that I considered possibly involved, by following the schematic diagrams up to the TP2, where I cannot find the expected "pulses"... I didn't replace all of them, but now I'm dubious if a spare A34 board could be a good choice.

PS if this posting begins boring someone, please tell me: I will go on in private form.

Tnx de Alberto, IZ2EWV
Re: A homemade diode power sensor for HP meters

 

This has been an interesting thread. Like everyone lots of dead power sensors. Whats funny is now even the dead sensors seem to have magical value. The actual meters are nice. Something about a analog readout for peaking power while tuning.
But that said I do agree that the modern ic power sensors good to about 6 Ghz seem like a reasonable fit.
But I believe that most of the circuits used in the meter may not be needed. If I get around to this I would tend to set the gain of a opamp in the meter through the db switch. The sensors have a predictable voltage out. A small?part of that range needs to be mapped into each power switch range. Easier said than done.
The alternative and I think perhaps far harder is to compress the IC sensor into what a diode would have put out. Then use the chopper and such as is.
Best of luck to anyone who goes further.
Regards
Paul
35241 - 35260 of 151484