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Re: 11713A attenuator driver modification for 15V and 5V

 

I think I would modify the power supply section.
Re: 11713A attenuator driver modification for 15V and 5V

 

The "drive" to the attenuators is just open collector transistors switching to ground. the posiitve supply goes to the common This is pin 1 on the viking connector. To use on other voltages just disconnect Pin 1 and connect the correct supply voltage. You could even just put a zener (9V or 19V) in series with the supply to the attenuator.

Robert G8RPI.
Re: LCR meter advice

 

On Thu, 28 Feb 2019, garp6 wrote:

Sorry, ... kind of obvious: ?the GR 1693 is limited to 10 KHz measurements,
? ?assuming higher frequency HP / Agilent units trump this aspect.
GR 1693 works from 12Hz to 200kHz. It is still being manufactured, BTW:



I have two of those (one original GR and one later Quadtech unit with
switchmode power supply) and they are wonderful instruments. Way more
precise than HP 4274A that I also have on my desk for everyday use :)

I do even have original GR calibration kit for 1693...

---
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* KSI@home KOI8 Net < > The impossible we do immediately. *
* Las Vegas NV, USA < > Miracles require 24-hour notice. *
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Re: My $25 "In Poor Shape" 3468A has arrived

 

On Thu, Feb 28, 2019 at 10:29 AM, ghnatiuk@... wrote:
Dave,
A non-zero reading on low volts DC and AC range with an open input to the meter means nothing other that you have pickup (coupling) into the meter from stray fields.? The input impedance of the meter in ACV is 1 Meg and a coupling capacitance from your mains wiring to the meter input of 2pF will create a voltage drop across the input of 0.1v.? ?On the 300mv and 3V? DC range the input impedance is on the order of 10^12 Ohms or higher in a dry laboratory.? The input impedance spec of 10GOhms is derated for a 40/95 environment.? Typically out of production after the de-ionized water wash and dry, the DC inputs will be as high as 10^14 ohms.? ? Floating inputs will give all sorts of random readings.

Random readings with the inputs floating is a non-issue.
George
Re: 11713A attenuator driver modification for 15V and 5V

 

Thanks for answer. Having a look at the real manual (the old one, not the one on the Keysight's web site without schematics) and at the drivers board, I find it is not easy as the 2V is not only used towards the attenuator but goes to the collectors of the switching transistors. I am interested in your solutions...


--------------------------------------------

On Thu, 2/28/19, Mark Bielman <mbielman@...> wrote:

Subject: Re: [HP-Agilent-Keysight-equipment] 11713A attenuator driver modification for 15V and 5V
To: [email protected]
Date: Thursday, February 28, 2019, 6:20 PM

Hello. Funny you should
ask! I just purchased one of these (standard 11713A) for the
purpose of testing HP/Agilent attenuators of various types
and voltages. My plan is to somehow add external connections
(banana jacks perhaps) that will allow me to select internal
(+24) or external voltages from a power supply. The unit has
not arrived yet so I'm still thinking about it. Will let
you know how it goes.

Of
note here: I have seen attenuators that sometimes get
"stuck" when used as intended. (ie, the solenoid
is pulsed and doesn't always switch - but when activated
manually at full voltage, it's fine.) Discovered that if
you reduce the supply voltage you can recreate the failure
on the bench. A typical 15V unit should work down to about
8Vdc... if one of the solenoids does not, it likely needs
new o-rings and/or some lube. (and if you are replacing even
1 o-ring, go ahead and do all of them!) This is why I'm
thinking of an external (adjustable) voltage source.

Mark
Re: My $25 "In Poor Shape" 3468A has arrived

 

Thanks George,
I am not used to such quality equipment. ;-)
Dave


On Thu, Feb 28, 2019 at 10:19 AM ghnatiuk@... <ghnatiuk@...> wrote:
Dave,
A non-zero reading on low volts DC and AC range with an open input to the meter means nothing other that you have pickup (coupling) into the meter from stray fields.? The input impedance of the meter in ACV is 1 Meg and a coupling capacitance from your mains wiring to the meter input of 2pF will create a voltage drop across the input of 0.1v.? ?On the 300mv and 3V? DC range the input impedance is on the order of 10^12 Ohms or higher.? ?Floating inputs will give all sorts of random readings.

Random readings with the inputs floating is a non-issue.
George



--
72 de Dave
VE7HR
Re: TelNet Data logging Application

 

Hi Steve and Cary
That looks sweet. I just got the software in another email. I will have to try it out soon. My HP3478 should arrive soon so I can try it out.
Thanks Steve and Cary.

Dave
VE7HR


On Thu, Feb 28, 2019 at 9:23 AM Steve Hendrix <SteveHx@...> wrote:
I want to publicly thank Cary Oler for putting together a slick data logging and graphing application that I find highly useful and you may too. It runs under Windows 7 & Windows 10 (and probably others), using the TelNet connection for data logging and live graphing. As one example, I have his data logger running continuously, reading the voltage on my solar power batteries via my KISS-488 and the rear terminals of my HP34401A, and displaying a continuous one-day graph. He has generously provided it for all KISS-488 users at . This nicely complements the logging and graphing capabilities within KISS-488; the PC application provides a live graph with much prettier formatting; KISS-488 does only offline graphing, but is platform-independent. Below is a sample display, as of right now.

Also, if you have a KISS-488, or know someone who does, you should have just received an email with a firmware update. If you did not, it means I don't have your email address, so please send me your address and the MAC address of your unit in a direct email.

Steve Hendrix

Emacs!



--
72 de Dave
VE7HR
Re: LCR meter advice

 


Sorry, ... kind of obvious: ?the GR 1693 is limited to 10 KHz measurements,
? ?assuming higher frequency HP / Agilent units trump this aspect.
Re: LCR meter advice

 


Anyone know how the ?General Radio / IET ?1693 RCL ?Digibridge meter ?compared with the various HP/ Agilent ?LCR units ??

The 1693 RCL was supposed to have been a metrology lab instrument, for out-of-circuit part measurements.?
? - sometimes a GR 1693, ?or older 1689 on eBay.

? ?have not seen a review or comparison ?to the HP / Agilent ... ? ?
TelNet Data logging Application

 

I want to publicly thank Cary Oler for putting together a slick data logging and graphing application that I find highly useful and you may too. It runs under Windows 7 & Windows 10 (and probably others), using the TelNet connection for data logging and live graphing. As one example, I have his data logger running continuously, reading the voltage on my solar power batteries via my KISS-488 and the rear terminals of my HP34401A, and displaying a continuous one-day graph. He has generously provided it for all KISS-488 users at . This nicely complements the logging and graphing capabilities within KISS-488; the PC application provides a live graph with much prettier formatting; KISS-488 does only offline graphing, but is platform-independent. Below is a sample display, as of right now.

Also, if you have a KISS-488, or know someone who does, you should have just received an email with a firmware update. If you did not, it means I don't have your email address, so please send me your address and the MAC address of your unit in a direct email.

Steve Hendrix

Emacs!

Re: 11713A attenuator driver modification for 15V and 5V

 

Hello. Funny you should ask! I just purchased one of these (standard 11713A) for the purpose of testing HP/Agilent attenuators of various types and voltages. My plan is to somehow add external connections (banana jacks perhaps) that will allow me to select internal (+24) or external voltages from a power supply. The unit has not arrived yet so I'm still thinking about it. Will let you know how it goes.

Of note here: I have seen attenuators that sometimes get "stuck" when used as intended. (ie, the solenoid is pulsed and doesn't always switch - but when activated manually at full voltage, it's fine.) Discovered that if you reduce the supply voltage you can recreate the failure on the bench. A typical 15V unit should work down to about 8Vdc... if one of the solenoids does not, it likely needs new o-rings and/or some lube. (and if you are replacing even 1 o-ring, go ahead and do all of them!) This is why I'm thinking of an external (adjustable) voltage source.

Mark
Re: 8753ES progress(?)

 

¿ªÔÆÌåÓý

I have the one without the integrated S parameter box, and yes I¡¯m feeding some of the output back to the R input. Definitely an internal problem.?


Peter

On Feb 28, 2019, at 10:07 AM, Jeff Kruth via Groups.Io <kmec@...> wrote:

I assume this has the integrated s-parameter box? If not, put a power splitter on the source out and drive the R & A channels. That message occurs in these beasts when the R channel has no input.


Jeff Kruth


In a message dated 2/27/2019 10:19:49 PM Eastern Standard Time, hpnpilot@... writes:

However, I'm still getting the No IF/PLL lock lost error messages! Something
doesn't add up here.
Re: 8753ES progress(?)

 

I assume this has the integrated s-parameter box? If not, put a power splitter on the source out and drive the R & A channels. That message occurs in these beasts when the R channel has no input.


Jeff Kruth


In a message dated 2/27/2019 10:19:49 PM Eastern Standard Time, hpnpilot@... writes:

However, I'm still getting the No IF/PLL lock lost error messages! Something
doesn't add up here.
11713A attenuator driver modification for 15V and 5V

 

Hello,
A lot of HP/Agilent/Keysight attenuators are operating under 15V or 5V instead of the traditional 24V supplied by the 11713A. Is there a HXX option for these supply levels or did anybody modify the 11713A to accomodate these various command levels ? Thank you.
Re: HP 8648B and an off topic request.

 

Hi George,

I hava a 8648B with the same symptoms, did you succeed in fixing it ?

?

Thanks

¸é¨¦³¾¾±
HP8562A firmware

 

Hello,

I'd like to upgrade the firmware of my HP8562A sa, Can any-one confirm I need to order 27C512 Eproms??
Many thanks,
Harke
Re: 3325A offset problem driving me crazy

 

Hi,

Yes, that is one path I'm investigating, but I don't think this is the case. Since for sine wave it is basically off scale on the positive side, while for other waveforms, the offset is wrong over to the negative side. If the output amp would be faulty and asymmetrical, both would be saturating or clipping to one side only. At least this is my reasoning why I think the problem is in the offset control.

Szabolcs


Daniel Nelson <djn@...> ezt ¨ªrta (id?pont: 2019. febr. 28., Cs, 5:21):

Szabolcs:

In reference to the 3325A Output Offset - It's my experience that if the 'amp cal' does not work, then the output amplifier has issues. From your description, I'd bet its somewhere in the power amp just before the attenuator. That often is a 'fun' job as its all DC coupled....

Dan in Chandler, AZ

Re: Agilent ET33074-6024 cable assembly

 

With small diameter coax and hex crimp connectors I would not expect anything special. They look over priced to me.

Robert G8RPI.
Re: 3325A offset problem driving me crazy

 

Szabolcs:

In reference to the 3325A Output Offset - It's my experience that if the 'amp cal' does not work, then the output amplifier has issues. From your description, I'd bet its somewhere in the power amp just before the attenuator. That often is a 'fun' job as its all DC coupled....

Dan in Chandler, AZ
Re: 8753ES progress(?)

 

No, I haven't.? As it is an involved test, especially without the described filter, I will do it tomorrow.? I measured the cavity oscillator at 3.008 GHz, pretty close to nominal.

Peter

On 2/27/2019 10:40 PM, pianovt via Groups.Io wrote:
Peter, have you done Test 54? Even though you checked the oscillator, it may not be sufficiently close to the right frequency. That can cause the loss of lock.

Vladan
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