¿ªÔÆÌåÓý

  1. HP-Agilent-Keysight-Equipment
  2. Messages
Expanded Topics Messages
Date
Re: 3458A Schaffner Mains Filter

 

¿ªÔÆÌåÓý

As far as I know there is not a problem. We've fitted hundreds of assorted types of Schaffner IEC input filters to equipment since the mid 1990s and as far as I know without any failure. I suppose there may have been failures but our customers may just not have mentioned it to us? (Unlikely!)

It is true that most of those will have been living in 220/240VAC land their whole lives whereas the only HP fitted one I've had fail went within a day or so of crossing the Atlantic and seeing 240V for the first time.

Any 'stand alone' yellow Rifa caps you find serving as input filters should be changed with extreme prejudice on sight however!?

On 06/09/2022 09:30, Stephen Bell wrote:

I have recently acquired a 3458A which incorporates a Schaffner FN9223-3-06 mains filter. The 3458A has a build date of approx 2005 and the Schaffner filter has a date code of 0432.

I am wondering if these later Schaffner filters have the same dramatic failure mode exhibited by their earlier models and whether it should be replaced. I am reluctant to replace it if it is not necessary due to it being riveted into the chassis.

3458A Schaffner Mains Filter

 

I have recently acquired a 3458A which incorporates a Schaffner FN9223-3-06 mains filter. The 3458A has a build date of approx 2005 and the Schaffner filter has a date code of 0432.

I am wondering if these later Schaffner filters have the same dramatic failure mode exhibited by their earlier models and whether it should be replaced. I am reluctant to replace it if it is not necessary due to it being riveted into the chassis.
Re: HP 3335A PSU woes PMD12K60.

 

I am still trying to find the time to get back to it but it may end up becomming more of a winter project looking at the bench at the moment. I understand that there may be many more hidden issues to work through but I will chip away at it as time allows and update as I go along. Thank you to all for the input so far. Karl
Re: HP8560E SA Display oddness

 

Jaap - thank you that's a great find!
Now ....? how did you get to that control? I have the cover off and can't see how to get to that board!
Thanks
Dan
Re: Hp 8590a spectrum analyzer

Richard Cook
 

I checked the shotky diodes in first mixer and they beep in both directions with the meter in diode check. .262 volts. Not a continuous beep but a short one. Also it spears both ends of the diode are tied together,? I read continuity.? Is that correct ?
Re: E4418A/4419A vs N1913A/1914A

 

Perhaps someone dialed in an offset? Press the green preset button to put the instrument back to its normal state and see if that fixes the issue.
Hp 8590a eeprom problem.

Richard Cook
 

I'm having a issue with a fail code 1310 . Of the 16 leds number 4 and number 12 are lit, but this problem go's away sometimes.? I think the revision is 11,12,86.the service manual is kinda confusion.is this something I can correct entering info or something . Thanks.?
Re: Should I be worried?

 

On 9/5/22 10:59, Yue wrote:
Did you check the battery for memory backup ? not sure the 70000 has battery or not but the module should easy to remove for inspection
The 70900A/B Local Oscillator module contains a Tadiran TL5104/P battery. It maintains the SRAM contents, including basic configuration info and any stored DLPs. I don't know what's causing the problem with Dave Miller's LO module, but I'm pretty sure it's not the battery.

-Dave

--
Dave McGuire, AK4HZ
New Kensington, PA
Re: Should I be worried?

 

Did you check the battery for memory backup ? not sure the 70000 has battery or not but the module should easy to remove for inspection?
Re: HP 5086-7906 YTO

 

I have 2 HP8563E both bought with dead YTO. and both YTO has aged BJT that has insufficient gain to keep the oscillation happen. The new original YTO is not obtainable, so I modified the YTO driver loops and installed two different type YTO (omini / advantek)? and both of them works without problem.

?

Also check the power supply. HP YTO (EYO) in 85xx has output level control loop. The loop will over voltage the BJT and finally destroy it if 5V (for output FET) is not present for some extend period.

?

I¡¯m also work on the new oscillator board for the EYO. With some modern tiny SMD device the rebuild YTO performance can even better than the old thin film circuits.?
Re: Hp 8590a spectrum analyzer

 

On Fri, Sep 2, 2022 at 11:32 AM, Richard Cook wrote:
If you need a terminator I'll send you one .
Thanks! But I have one. Used to install coaxial networking in a distant past!
Re: Hp 8590a spectrum analyzer

 

Thanks. Did not know that! 50 ohm I guess?
Clear screen protector for 16702 touchscreen?

 

I have my 16702b apart right now.?? I was pondering adding some clear screen protector over the touchscreen.

Large sheets of generic film are available inexpensively.?? I couldn't find any past discussion on this here.? I'm not expecting any issues but thought I'd ask before I ordered some.

Thanks
Re: Hp 8590a spectrum analyzer

 

Yes, there should be a termination on the LO output. ?The YIG drives a balanced splitter, with one leg going to the mixer and one to the front panel jack. ?Without the termination, the LO injection will be a bit off and it will skew the displayed amplitude off a bit from expectations. ?Not much, but a bit. ?The LO output is usually used for connecting to a tracking generator. ?
Re: HP8560E SA Display oddness

 

8560E - the display characters are not so good

Hi Dan and others,

Found the problem, at least in my case. It's the DISPLAY CUTOFF adjustment. I did not adjust anything else for the time beeing, just this one. It's on page 64 (PDF page 65) of the 8560E/EC Service Guide from December 1999.


I now have perfect looking characters again.
Give it a try Dan.

Jaap

Re: Power meter advice

 

On 9/4/22 18:58, John Lyles wrote:
I was using the Hp 436A in the 1980s, and the 438A was a significant improvement, in being able to read forward and reflected power from a dual directional coupler, for example, with built in math abilities. I didn't see the 437A until the 1990s. We bought a few of them, and quickly found that they are not as reliable as their predecessors. I have scrapped more than one dead 437A while the 438A models are still going.
One problem in the 437B design is that some parts of its power supply are powered up whenever the instrument is plugged in, but the front panel power switch is "off". I've had several 437Bs, three or four, and I've had one fail because of this. The 4700uF capacitor in the 5V power supply, before the power switch, had dried out. Replacing it solved the problem.

-Dave

--
Dave McGuire, AK4HZ
New Kensington, PA
Re: Power meter advice

 

I was using the Hp 436A in the 1980s, and the 438A was a significant improvement, in being able to read forward and reflected power from a dual directional coupler, for example, with built in math abilities. I didn't see the 437A until the 1990s. We bought a few of them, and quickly found that they are not as reliable as their predecessors. I have scrapped more than one dead 437A while the 438A models are still going.

You can tell about old Hp instruments, if they have LED 7 seg displays and the click style rounded corner buttons, they came before the ones with the rubbery "flubber" square cornered buttons. But their scopes came from a different style again.

These days we buy the N1912A with N1921A sensor, as we are measuring pulsed RF power. I like a Boonton model as well. The specs for the Keysight meters are more detailed where the Boonton has some vague specs that are surprising.?

John Lyles
-------------------------------------------------------
E4418A/4419A vs N1913A/1914A

 

Can anyone explain the major differences between these two series of power meters?

I have a number of E4418A/4419As and they have proven reliable and easy to use, except for one which does not calibrate correctly (after calibrating, the 0dBm reading is off, and this is true even if I use an alternative cal siggen). I haven't figured out how to fix that problem but if anyone knows how to do it...

The N1913A/1914A are newer and more expensive. Any major advantages making the higher price worthwhile?

Thanks!

Jim
Re: FS: (US) HP 83525A and 83522A RF Plug-ins for 8350A/B Sweep Generator

 

The HP 83522A has been sold. Thank you for looking. The HP 83525A is still available and ready to ship.

Details are here:?

Clamp tip for hp current probe

 

Hello All,

I have an hp 01110-61601 Current Probe that needs the clamp which threads at the tip. Does anyone have any of these they would be willing to part with?

Thanks in advance.

Christopher Tucker

01110-61601.jpg

22501 - 22520 of 151469