¿ªÔÆÌåÓý

  1. HP-Agilent-Keysight-Equipment
  2. Messages
Expanded Topics Messages
Date
Re: HP-1421A Q109 Voltages

 

The 1821A is very similar for the reset lamp circuit, the voltages are negative on the base, picture below is from the repair of my 1821A, the lamp had failed in that one.


David
Re: HP-1421A Q109 Voltages

 

Copy/paste didn't work.
HP 1821 has almost the same circuit.
Ozan
===


On Fri, Mar 29, 2024 at 02:05 PM, Ozan wrote:
HP has almost the same exact circuit with -8.5V in one state (lamp is on) and -11.4V (lamp is off) in another state. Looking at 1421 schematic, few voltages look like typos.?
Ozan
?


On Fri, Mar 29, 2024 at 01:50 PM, Hugh Gilbert wrote:
-8.8V seems much more plausible, with the emitter -9.4V
?
Hugh Gilbert

On Fri, Mar 29, 2024 at 4:02?PM n4buq <n4buq@...> wrote:
Chuck,

Thank you so much for that.? I couldn't tell if that was a + or a - in front of the base voltage but that shows it clearly as +.

Thanks again,
Barry - N4BUQ

----- Original Message -----
> From: "ChuckA" <chuck@...>
> To: "HP-Agilent-Keysight-equipment" <[email protected]>
> Sent: Friday, March 29, 2024 2:38:15 PM
> Subject: Re: [HP-Agilent-Keysight-equipment] HP-1421A Q109 Voltages

> Here's a clean scan of the section you are looking at.
>
> ChuckA
>
> On 3/29/2024 3:16 PM, n4buq wrote:
>> Does anyone have a readable schematic for the A101 board in a 1421A?? I have a
>> paper manual on order but until that arrives, I would appreciate finding out
>> the voltages shown for Q109 (Page 5-16, Figure 5-9).? From what I can tell, the
>> online scan appears to show:
>>
>> C: +48V
>> B: -8.8V
>> E: -9.4V
>>
>> The value for B is particularly blurry but would like to know for sure what all
>> of those are.
>>
>> Thanks,
>> Barry - N4BUQ
>>
>>
>>
>>
>>
>>
>
> --
> See Early TV at:
>
>
>
>
>
>





Re: HP-1421A Q109 Voltages

 

HP has almost the same exact circuit with -8.5V in one state (lamp is on) and -11.4V (lamp is off) in another state. Looking at 1421 schematic, few voltages look like typos.?
Ozan
?


On Fri, Mar 29, 2024 at 01:50 PM, Hugh Gilbert wrote:
-8.8V seems much more plausible, with the emitter -9.4V
?
Hugh Gilbert

On Fri, Mar 29, 2024 at 4:02?PM n4buq <n4buq@...> wrote:
Chuck,

Thank you so much for that.? I couldn't tell if that was a + or a - in front of the base voltage but that shows it clearly as +.

Thanks again,
Barry - N4BUQ

----- Original Message -----
> From: "ChuckA" <chuck@...>
> To: "HP-Agilent-Keysight-equipment" <[email protected]>
> Sent: Friday, March 29, 2024 2:38:15 PM
> Subject: Re: [HP-Agilent-Keysight-equipment] HP-1421A Q109 Voltages

> Here's a clean scan of the section you are looking at.
>
> ChuckA
>
> On 3/29/2024 3:16 PM, n4buq wrote:
>> Does anyone have a readable schematic for the A101 board in a 1421A?? I have a
>> paper manual on order but until that arrives, I would appreciate finding out
>> the voltages shown for Q109 (Page 5-16, Figure 5-9).? From what I can tell, the
>> online scan appears to show:
>>
>> C: +48V
>> B: -8.8V
>> E: -9.4V
>>
>> The value for B is particularly blurry but would like to know for sure what all
>> of those are.
>>
>> Thanks,
>> Barry - N4BUQ
>>
>>
>>
>>
>>
>>
>
> --
> See Early TV at:
>
>
>
>
>
>





Re: HP-1421A Q109 Voltages

 

That's what I kept thinking - especially since everything else that's connected to the base is negative.? Could that be a typo?

Barry - N4BUQ

-8.8V seems much more plausible, with the emitter -9.4V

Hugh Gilbert

On Fri, Mar 29, 2024 at 4:02?PM n4buq <n4buq@...> wrote:
Chuck,

Thank you so much for that.? I couldn't tell if that was a + or a - in front of the base voltage but that shows it clearly as +.

Thanks again,
Barry - N4BUQ

----- Original Message -----
> From: "ChuckA" <chuck@...>
> To: "HP-Agilent-Keysight-equipment" <[email protected]>
> Sent: Friday, March 29, 2024 2:38:15 PM
> Subject: Re: [HP-Agilent-Keysight-equipment] HP-1421A Q109 Voltages

> Here's a clean scan of the section you are looking at.
>
> ChuckA
>
> On 3/29/2024 3:16 PM, n4buq wrote:
>> Does anyone have a readable schematic for the A101 board in a 1421A?? I have a
>> paper manual on order but until that arrives, I would appreciate finding out
>> the voltages shown for Q109 (Page 5-16, Figure 5-9).? From what I can tell, the
>> online scan appears to show:
>>
>> C: +48V
>> B: -8.8V
>> E: -9.4V
>>
>> The value for B is particularly blurry but would like to know for sure what all
>> of those are.
>>
>> Thanks,
>> Barry - N4BUQ
>>
>>
>>
>>
>>
>>
>
> --
> See Early TV at:
>
>
>
>
>
>






Re: HP-1421A Q109 Voltages

 

-8.8V seems much more plausible, with the emitter -9.4V

Hugh Gilbert


On Fri, Mar 29, 2024 at 4:02?PM n4buq <n4buq@...> wrote:
Chuck,

Thank you so much for that.? I couldn't tell if that was a + or a - in front of the base voltage but that shows it clearly as +.

Thanks again,
Barry - N4BUQ

----- Original Message -----
> From: "ChuckA" <chuck@...>
> To: "HP-Agilent-Keysight-equipment" <[email protected]>
> Sent: Friday, March 29, 2024 2:38:15 PM
> Subject: Re: [HP-Agilent-Keysight-equipment] HP-1421A Q109 Voltages

> Here's a clean scan of the section you are looking at.
>
> ChuckA
>
> On 3/29/2024 3:16 PM, n4buq wrote:
>> Does anyone have a readable schematic for the A101 board in a 1421A?? I have a
>> paper manual on order but until that arrives, I would appreciate finding out
>> the voltages shown for Q109 (Page 5-16, Figure 5-9).? From what I can tell, the
>> online scan appears to show:
>>
>> C: +48V
>> B: -8.8V
>> E: -9.4V
>>
>> The value for B is particularly blurry but would like to know for sure what all
>> of those are.
>>
>> Thanks,
>> Barry - N4BUQ
>>
>>
>>
>>
>>
>>
>
> --
> See Early TV at:
>
>
>
>
>
>





HP342A Noise Figure Meter Operating and Service Manual

 

If you have the meter and desire the original detailed service manual complete with fold out schematics
error correction graphs, theory of operation...

Please PM direct.?

Serials prefixed 416--- xxx
hp p/n 00342-90001


Thanks,?
Re: HP-1421A Q109 Voltages

 

Chuck,

Thank you so much for that. I couldn't tell if that was a + or a - in front of the base voltage but that shows it clearly as +.

Thanks again,
Barry - N4BUQ

----- Original Message -----
From: "ChuckA" <chuck@...>
To: "HP-Agilent-Keysight-equipment" <[email protected]>
Sent: Friday, March 29, 2024 2:38:15 PM
Subject: Re: [HP-Agilent-Keysight-equipment] HP-1421A Q109 Voltages
Here's a clean scan of the section you are looking at.

ChuckA

On 3/29/2024 3:16 PM, n4buq wrote:
Does anyone have a readable schematic for the A101 board in a 1421A? I have a
paper manual on order but until that arrives, I would appreciate finding out
the voltages shown for Q109 (Page 5-16, Figure 5-9). From what I can tell, the
online scan appears to show:

C: +48V
B: -8.8V
E: -9.4V

The value for B is particularly blurry but would like to know for sure what all
of those are.

Thanks,
Barry - N4BUQ





--
See Early TV at:

www.myvintagetv.com
Re: 85719A Noise Figure Measurements Personality for HP8595A

 

On Thu, Mar 28, 2024 at 10:44 PM, hardyhansendk wrote:

You are correct-this analyzer must have hardware option 119(noise fgure) for use with ?85719A.Its not difficult to transfer this program via gpib.

Regarding the expensive ram cards used for this analyzer series¡­just use the cards made for HP 48 calculators,much cheaper.

Yes, there is a process to have "downloadable programs" sent to the 8595E.? I do need to get the program though!
Re: HP-1421A Q109 Voltages

 

Here's a clean scan of the section you are looking at.

ChuckA

On 3/29/2024 3:16 PM, n4buq wrote:
Does anyone have a readable schematic for the A101 board in a 1421A? I have a paper manual on order but until that arrives, I would appreciate finding out the voltages shown for Q109 (Page 5-16, Figure 5-9). From what I can tell, the online scan appears to show:

C: +48V
B: -8.8V
E: -9.4V

The value for B is particularly blurry but would like to know for sure what all of those are.

Thanks,
Barry - N4BUQ




--
See Early TV at:

www.myvintagetv.com

1421A_pg5-16.jpg

HP-1421A Q109 Voltages

 

Does anyone have a readable schematic for the A101 board in a 1421A? I have a paper manual on order but until that arrives, I would appreciate finding out the voltages shown for Q109 (Page 5-16, Figure 5-9). From what I can tell, the online scan appears to show:

C: +48V
B: -8.8V
E: -9.4V

The value for B is particularly blurry but would like to know for sure what all of those are.

Thanks,
Barry - N4BUQ
Re: HP 427A no DC offset adj. pot

 

Is it possible that the unit is late enough that its using a 0 offset opamp and wouldn't need that pot? I did look at the online schematic and do see what your talking about. But maybe they were not needed later on.?
Hard to believe.
Paul
WB8TSL
Re: 85719A Noise Figure Measurements Personality for HP8595A

 

¿ªÔÆÌåÓý

Hi

The HP 8595A have a card reader at front,and need hardware option 119 when used with NF personality DLP.

Hardy

?

Fra: [email protected] <[email protected]> P? vegne af alan victor
Sendt: 28. marts 2024 19:02
Til: [email protected]
Emne: Re: [HP-Agilent-Keysight-equipment] 85719A Noise Figure Measurements Personality for HP8595A

?

On Thu, Mar 28, 2024 at 05:47 AM, vk2bea wrote:

HP8595A

Michael,?

You need the personality module reader that attaches to the rear of the 95A. The card is read by the?
reader and uses the noise marker mode and the noise measurement method is the GAIN method of?
noise figure techniques. Today, sometimes referred to as the cold source method. The SW optimizes
the SA to obtain a low noise capability, takes into account the NEBW, etc... You most likely will need?
an LNA in front of your analyzer particularly if you are trying to do low noise measurements. Required?
to avoid the 2nd stage NF contribution from the SA.?


Virusfri.
Re: 85719A Noise Figure Measurements Personality for HP8595A

 

¿ªÔÆÌåÓý

Hi

You are correct-this analyzer must have hardware option 119(noise fgure) for use with ?85719A.Its not difficult to transfer this program via gpib.

Regarding the expensive ram cards used for this analyzer series¡­just use the cards made for HP 48 calculators,much cheaper.

Hardy

?

Fra: [email protected] <[email protected]> P? vegne af jmr via groups.io
Sendt: 28. marts 2024 20:55
Til: [email protected]
Emne: Re: [HP-Agilent-Keysight-equipment] 85719A Noise Figure Measurements Personality for HP8595A

?

I'm pretty certain the analyser will use the Y factor method (not the gain method) so an external noise source (HP 346B?) and an external preamp is needed (HP 87405A would be good here as it can be powered from the front panel of the analyser).

Hopefully, the analyser has the 28V drive port at the rear and this is probably the internal hardware that is required for this option. If so it might be possible to clone an existing SW card and plug it in and it would all work. I'm not sure if it can be loaded via GPIB.


Virusfri.
Re: Looking for a copy of the 4263B Adjustment Program, part number 04263-65005

 

Thank for the info. I have sent off an email to Carleton University but also still searching. :)



Jared
Re: 85719A Noise Figure Measurements Personality for HP8595A

 

On Thu, Mar 28, 2024 at 11:02 AM, alan victor wrote:
You need the personality module reader that attaches to the rear of the 95A
Sorry .. finger trouble ..? I meant to write 95E.
Re: Looking for replacement ECL logic chips etc, for HP 8160A Pulse generator.

 

After having a bit of a search online etc, I have found that Keysight list the 1820-2149 as being replaced by 5088-7082 (both are obsolete), so that opens up the search parameters a bit maybe.


Jared
Re: A document about the 8165A

 

As always, an absolutely beautiful document, for the mind and the eyes.

Thanks!
Re: 85719A Noise Figure Measurements Personality for HP8595A

 

I'm pretty certain the analyser will use the Y factor method (not the gain method) so an external noise source (HP 346B?) and an external preamp is needed (HP 87405A would be good here as it can be powered from the front panel of the analyser).

Hopefully, the analyser has the 28V drive port at the rear and this is probably the internal hardware that is required for this option. If so it might be possible to clone an existing SW card and plug it in and it would all work. I'm not sure if it can be loaded via GPIB.
Re: HP 427A no DC offset adj. pot

 

EDIT:
The latest manual I've found is 00427-90005. ?I saw?00427-90008 referenced in a comment on a web page but haven't found it anywhere.

Leon...
HP 427A no DC offset adj. pot

 

Hello,
I recently acquired a Govt. Surplus (Air Force) HP 427A, SN/ 947-A19375. ?I was going to adjust the DC offset according to section 5-30 of the manual but the A2 board doesn't have the A2R7 pot for this. ?It also doesn't have the A2R17 pot depicted on the schematic as well. ?The latest manual version I have found online is 00427-90008 and it reflects the presence of both of those pots. ?Can anyone advise me on the DC offset procedure for this unit or perhaps direct me to the most recent manual? ?Thank you,

Leon...
8921 - 8940 of 151561