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Want to use a high-res voltmeter in the Portland Oregon area

 

I have a couple of 5-1/2 digit differential
voltmeters (Fluke 877A and 895A) in whose
calibration I have lost confidence.
Since (a) I don't have cubic dollars to spare
and (b) it's Just A Hobby, a cal lab is out of
the question. Do you know of anyone local to me
(Portland Oregon) who has a 6-1/2 digit or better
voltmeter that's in good cal? I will also gladly
accept suggestions for other places to ask.

No profits are riding on this. I'm doing it
just for the heck of it, to satisfy myself
that they're in spec.

Thanks,
Dave Wise
Lost emails

Don Collie
 

Due to a programming error [Me], I have lost all emails between 2-30 PM yesterday, and
11-00AM today. Please resend. Sorry about that!
Cheers,.................................Don Collie jnr.
Re: CLIP for 8753A?

 

If your friend isn't planning on keeping his 8753A turned on 24/7,
he can probably restore the CRT's brightness by using a common
CRT restorer/rejuvenator. I have done this with other HP CRT's,
and had good success. Another poster has done some life experiments,
and found that the restored/rejuvenated HP CRT's have quite a few
hours left in them after the procedure is done.

-Chuck Harris

rovmkr wrote:

Hi Dean, I'm not sure what you are looking for on the 8753A but on behalf of a friend without internet (dont ask)... His HP 8753B has a very faint display, does he need a new CRT? Any one with similar experience? Any one know where to get one?
He needs to scan continuous to 6 GHz and is thinking of an 8753D with opt 006. Will this do it or is it in two bands? Anyone know where to get one?
Another thought is the 8752C but is the instruction set for these different instruments the same as that of the 8753B? He doesnt want to re-write the software. We need to get hold of a catalog in the mid '90s. Peter.
--- In hp_agilent_equipment@..., "tunerwiz" <tunerwiz@...> wrote:
Now that all these CLIP's start to appear, was there ever anything on the 8753A?
Dean
Yahoo! Groups Links
Re: CLIP for 8753A?

 

Hi Dean, I'm not sure what you are looking for on the 8753A but on
behalf of a friend without internet (dont ask)... His HP 8753B has a
very faint display, does he need a new CRT? Any one with similar
experience? Any one know where to get one?
He needs to scan continuous to 6 GHz and is thinking of an 8753D with
opt 006. Will this do it or is it in two bands? Anyone know where to
get one?
Another thought is the 8752C but is the instruction set for these
different instruments the same as that of the 8753B? He doesnt want to
re-write the software. We need to get hold of a catalog in the
mid '90s. Peter.


--- In hp_agilent_equipment@..., "tunerwiz" <tunerwiz@...>
wrote:

Now that all these CLIP's start to appear, was there ever anything on
the 8753A?

Dean
HP1000 gold plated prototyping board with bus decoders

 

Hi Chaps,

Have an HP1000 prototyping board, its gold plated and fits in the CPU chassis,
has 11 bus decoder logic chips and room for 40+ ICs, in excellent condition :0

Anyone still using these around the traps /






Regards from


Mike Massen
Network Power Systems
Lab +61 (0) 8 9444 8961
Mb +61 (0) 438 048961
Perth, Western Australia
* USA GMC, Opel and Australian VL/VK/VN,VP Commodore Fuse Rail that wont warp or melt !
* RB30 Skyline/Nissan/VL Upgraded ignition driver now in long term economy trials
* Twin tyres for most sedans, trikes and motorcycle sidecars
* Industrial grade PolyVinyliDeneChloride (PVDC Copolymer) in bulk, the best
oxygen and water protective barrier you can find for circuit boards.
* Special Equipment for sale: 60KVA 3-phase UPS with large battery cabinet - $12,000
Web site under construction, Ebay and Oztion Auctions

Re: 1820-0098 decade divider IC for 5321A

marc_bury
 

--- In hp_agilent_equipment@..., "arthurok" <arthurok@...>
wrote:

does the unit use a 5 volt power supply?
one trick would be to build up a circuit to divide a
crystal osc down to 5 hz
i think a 7492 is a divide by 12 counter.
7490 is divide by 10 in ttl
More informations on the schematics:

The logic power supply is +5V (more exactly 5,1V according to the
manual), the logic is TTL (not ECL) but the function of the I/O pins
is not totally trivial.

The decade divider chip 1820-0098 picks up its 100Hz input with a
capacitor coupling just behind the 155V high voltage rectifier.

The chip has an input pin and divide by 10 output cascaded to another
divide by 10 chip, a reset input, plus a couple of less obvious pins:
I named them control input and controlled output.
The controlled outputs from the two cascaded dividers are connected
together directly and to the Clock input of the counter Main Gate JK
flip-flop.
The control pins are connected to the gate time selector switch that
can ground one or the other divider's control pin.
The logic appears to be: grounded control pin => controlled output is
active divide by 10 output, else controlled output is high Z.

So I guess I could effectively replace this chip with a modern decade
divider such as a 7490, a logic OR and an open collector transistor.

My main option is still to try to find a spare chip ...

-Marc-
Re: Powering a HP 1141A probe

Robert Hagenbach
 

Mark,

Thanks! I am watching the item now!

Bob

Mark Kahrs <mark.kahrs@...> wrote:
Why bother? Just buy a 1142A supply; one is on epay right now for $9.99.

On 1/10/07, Robert Hagenbach <rc_hagenbach@...> wrote:

Hi,

I bought a HP 1141A RF Differential probe on eBay. It
did not come with a power supply. The power connector
looks like a 8 pin DIN connector. This would seem to
me to indicate that the power supply is more
complicated than +/- 12 volts. Can anyone help me with
a pin out of the power connector? Should I considered
buying a power supply or is it possible to build one?

Bob Hagenbach
Largo, Fl
Re: Digest Number 912

Chris Bartram
 

--- In hp_agilent_equipment@..., "tunerwiz" <tunerwiz@...
wrote:
> Now that all these CLIP's start to appear, was there ever anything on
> the 8753A?
I just want to add that I need a schematic for the frac-N digital
board. I have a problem on this board that seems to be heat related.

Thanks, Dean
I'm also chasing a sporadic problem with my 8753B - it appears to also be in
the Frac-N synthesiser board. Maybe a 'sticky' gate.

I've been asking around about a CLIP for about a year. Someone did contact me
with an offer of a pack for $100, which I'd be quite prepared to pay -
particularly at the current UK?-US$ exchange rate(!!) - but I lost his email
address in a bout of finger trouble.

I've also emailed Mike Kawasaki at Agilent, who has been extraordinarily
helpful, but has not been able to assist with the CLIP.

My suspicion is that the early 8753 analysers still form a revenue stream for
Agilent repair facilities, and that they are (understandably) reluctant to
allow the information into the public domain.

Cheers

Chris
GW4DGU
Re: Powering a HP 1141A probe

 

Why bother? Just buy a 1142A supply; one is on epay right now for $9.99.

On 1/10/07, Robert Hagenbach <rc_hagenbach@...> wrote:

Hi,

I bought a HP 1141A RF Differential probe on eBay. It
did not come with a power supply. The power connector
looks like a 8 pin DIN connector. This would seem to
me to indicate that the power supply is more
complicated than +/- 12 volts. Can anyone help me with
a pin out of the power connector? Should I considered
buying a power supply or is it possible to build one?

Bob Hagenbach
Largo, Fl
Re: HP 1650A boot diskette

 

--- In hp_agilent_equipment@..., "va7dij" <va7dij@...>
wrote:

Can anyone help me get a copy of one of these?
Agilent site, here
<;
Apro&pageMode=DS&cc=US&lc=eng>
Re: spectrum analyzer 1st mixer

 

Hi erik,

Whether you can repair HP mixers at home probably has to do
with what you have at home to work with ;-)

I would have to see the mixer in question. It probably requires
a microscope, and a wire bonding machine... but maybe not.

I have friends that have put new transistors in HP hybrids from
that time frame with a microscope, some silver epoxy, and a steady
hand.

-Chuck Harris

erik wrote:

On Tuesday 09 January 2007 21:30, Chuck Harris wrote:
Hello , Thank you for the quick and detailed answer , sounds like that is my problem , I did inject -30dB signal directly in the input port of the mixer , problem is te same, so mixer is blown . I suppose home-repair of a 1st mixer HP style is not feasable ? rgds , Erik
Re: 1820-0098 decade divider IC for 5321A

 

does the unit use a 5 volt power supply?
one trick would be to build up a circuit to divide a crystal osc down to 5 hz
i think a 7492 is a divide by 12 counter.
7490 is divide by 10 in ttl

----- Original Message -----
From: marc_bury
To: hp_agilent_equipment@...
Sent: Thursday, January 11, 2007 1:01 AM
Subject: [hp_agilent_equipment] 1820-0098 decade divider IC for 5321A


Hello group,

I have an "almost" working HP 5321A counter.
It is a small 4 Nixie tubes counter with modest frequency capability,
and my problem is that this instrument uses the 60 Hz power source as
its reference, but I live in a 50 Hz area...

According to the manual, the 50 Hz option includes changing an IC from
a "divide by 6" to a decade counter.
Nothing surprising there, but I found that the afore-mentionned decade
IC is an HP specific part: 1820-0098. (8 pin TO like metal can)
And Google only leads me to the usual sites reserved for professionnal
traders. (Sphere does not carry this reference)

So if any good soul in the group has a spare 1820-0098, or a defunct
board for an HP counter in this range (there is another decade divider
on the board, also 5321A and 5221A are basically the same instrument),
I would be glad to arrange a trade.
Alternatively a datasheet, or equivalent modern reference would allow
me to restore my 5321A to normal counting if not with original parts.

Thank you for reading,
Marc
1820-0098 decade divider IC for 5321A

marc_bury
 

Hello group,

I have an "almost" working HP 5321A counter.
It is a small 4 Nixie tubes counter with modest frequency capability,
and my problem is that this instrument uses the 60 Hz power source as
its reference, but I live in a 50 Hz area...

According to the manual, the 50 Hz option includes changing an IC from
a "divide by 6" to a decade counter.
Nothing surprising there, but I found that the afore-mentionned decade
IC is an HP specific part: 1820-0098. (8 pin TO like metal can)
And Google only leads me to the usual sites reserved for professionnal
traders. (Sphere does not carry this reference)

So if any good soul in the group has a spare 1820-0098, or a defunct
board for an HP counter in this range (there is another decade divider
on the board, also 5321A and 5221A are basically the same instrument),
I would be glad to arrange a trade.
Alternatively a datasheet, or equivalent modern reference would allow
me to restore my 5321A to normal counting if not with original parts.

Thank you for reading,
Marc
Re: 1820-0098 decade divider IC for 5321A

 

Given the small number of pins, would it be possible to inspect the
devices' operation and use either an ECL or 'F; TTL substitute with
a small daughter board. Or, as we used to do, solder an SMT part
into the air on its legs directly so to speak and drop a blob of epoxy over it...

Whats the upper freq spec btw, havent seen a nixie counter for nigh
on 25 years ?!


Regards from


Mike Massen
Network Power Systems
Lab +61 (0) 8 9444 8961
Mb +61 (0) 438 048961
Perth, Western Australia
* USA GMC, Opel and Australian VL/VK Commodore Fuse Rail that wont warp or melt !
* RB30 Skyline/Nissan/VL Upgraded ignition driver now in long term economy trials
* Twin tyres for most sedans, trikes and motorcycle sidecars
* Industrial grade PolyVinyliDeneChloride (PVDC Copolymer) in bulk, the best
oxygen and water protective barrier you can find for circuit boards.
* Special Equipment for sale: 60KVA 3

At 03:01 PM 11/01/07, you wrote:

Hello group,

I have an "almost" working HP 5321A counter.
It is a small 4 Nixie tubes counter with modest frequency capability,
and my problem is that this instrument uses the 60 Hz power source as
its reference, but I live in a 50 Hz area...

According to the manual, the 50 Hz option includes changing an IC from
a "divide by 6" to a decade counter.
Nothing surprising there, but I found that the afore-mentionned decade
IC is an HP specific part: 1820-0098. (8 pin TO like metal can)
And Google only leads me to the usual sites reserved for professionnal
traders. (Sphere does not carry this reference)

So if any good soul in the group has a spare 1820-0098, or a defunct
board for an HP counter in this range (there is another decade divider
on the board, also 5321A and 5221A are basically the same instrument),
I would be glad to arrange a trade.
Alternatively a datasheet, or equivalent modern reference would allow
me to restore my 5321A to normal counting if not with original parts.

Thank you for reading,
Marc
Re: HP8920/A/B diagrams

 

--- In hp_agilent_equipment@..., "rfiemiguy" <rhyolite@...>
wrote:

Hardy; I would be interested in your .pdf and any other 8920 related
service or cal info. Thanks
Here is direct download link
<;
Information_Packet.pdf>

Dean


<;
Information_Packet.pdf>
Re: spectrum analyzer 1st mixer

 

On Tuesday 09 January 2007 21:30, Chuck Harris wrote:
Hello ,

Thank you for the quick and detailed answer , sounds like that is my problem ,
I did inject -30dB signal directly in the input port of the mixer , problem
is te same, so mixer is blown . I suppose home-repair of a 1st mixer HP
style is not feasable ?

rgds ,
Erik
Hi,

I am not familiar with the exact part in question, but very often,
spectrum analyzer mixers are of the double balanced diode type (DBM).

When working correctly, a DBM provides at least 20dB of isolation between
the LO, RF, and IF ports. So, when you move the LO towards the low end
of the band, like you are doing at 10MHz, the LO, and IF are approaching
each other in frequency, until you hit zero (DC) Hz, where they are exactly
the same frequency. If the DBM is working correctly, it will provide you
with more than a 20DB isolation between the IF, and LO ports, which will
reduce the amount of LO that goes right into the IF port by at least 20dB.

However, if the DBM has a burned out diode, it will no longer give you
much, if any, isolation between the IF and LO ports, and you will see
a drastically larger amount of LO signal being stuffed into the IF port.
This cannot help but wreck the amplitude flatness at the low end of the
band. At the high end of the band, this lack of isolation goes all but
unnoticed because the IF filters are sufficiently steep to keep the LO
signal out of the IF port.

-Chuck Harris

ericapple2004 wrote:
Hello ,
While the spectrumanalyzer pro-and contra's are actual on this group,
may be someone can help with this:
My 70904A RF module (HP70100 analyzer) works perfectly from 10 MHz to
2.9 GHz , however below 10 MHz amplitude flatness goes down rapidly ,
-20 dB at 1 MHz .
Manual says problem with 1st mixer ??
I have difficulty to understand that the mixer can be shot and at the
same time performing above 10 MHz without problem ?

Basic layout of the first stages are : 0-70 dB attenuator ,
switchable AC -DC , then limiter 10 mW dc-3GHz , then 1st mixer ...

I would guess a series resistor burned out , becoming a nice series
capacitor that way ??

Any suggestions for repair ? Thanks Erik Belgium

PS . Other people using HP 70000 mms equipment on this group ,I like
to share experience ?
Re: HP8920/A/B diagrams

rfiemiguy
 

Hardy; I would be interested in your .pdf and any other 8920 related
service or cal info. Thanks

--- In hp_agilent_equipment@..., "Hardy Hansen"
<hardyhansen@...> wrote:

Hi
I have the clip for 8920a in pdf.Do believe it was taken from
agilent manual section,but were removed .
Can make a copy if needed.
Regards
Hardy
----- Original Message -----
From: nj902
To: hp_agilent_equipment@...
Sent: Monday, January 08, 2007 9:54 PM
Subject: [hp_agilent_equipment] Re: HP8920/A/B diagrams


--- In hp_agilent_equipment@..., "tunerwiz"
<tunerwiz@>
wrote:
"I often wonder if Agilent have component level diagrams for
these
units? ..."
--------------------------------------------------------

Answers to a previous thread indicated that this information
exists.







[Non-text portions of this message have been removed]
HP Manuals And Catalogs For Sale

BSugarberg
 

Hello,

I have the following for sale:

External Time Base 17108A/17108AM. March 1967, with changes to Nov. 1967. $5.00.

DC Power Supply SCR-3 Series, Model 6456B. May, 1967. $5.00.

DC Power Supply MPB-5 Series, Model 6286A. Dec., 1966. $5.00.

HP 5300A Measurement System Operating And Service
Manual. Revised March 1973. $15.00.

Catalogs
--------
1965 1967 1968 1969 1970
1972 1977 1978 1979 1980
1982 1988 1989

Please make an offer on ALL 13 catalogs.

All prices plus shipping.

Thank you,

Bruce WA8TNC
Re: CLIP for 8753A?

 

--- In hp_agilent_equipment@..., "tunerwiz" <tunerwiz@...>
wrote:

Now that all these CLIP's start to appear, was there ever anything on
the 8753A?

Dean
&#92;
I just want to add that I need a schematic for the frac-N digital
board. I have a problem on this board that seems to be heat related.

Thanks, Dean
HP 1650A boot diskette

va7dij
 

Can anyone help me get a copy of one of these?
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