Re: 8673G Service Manual?
Hi James,
Have you managed to get hold of a copy of the service manual? So far I have not and my 9673G suffers from low output.
Generally 30 dB too low, so I suspect the final amp died. The attanuator and all other functions are OK.
There must be some doc around, they are not that rare beasts. Even a detailed circuit diagram would help.
Cheers, Hans PA0LED
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Hi?
have here an oscillator and need schematic and pinout for test.
Does somebody has a datasheet of the YIG?
Best regards
Armin
HB9MFL
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Re: HP435 measuring head?
Orin, Glad you chimed in!
I have couple 436's and when I auto zero they tend to drift a little after short period of time. I thought my sensors were at fault since my room has window AC nearby causing the room temp to fluctuate +- couple degrees.?
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Re: HP435 measuring head?
To stay "on topic", I've collected 4 or 5 of the 435's just to have the cal. source that's inside. I know they are old and the freq. drifts on them but the output level is what I cares about when calibrating the sensor before I make any measurements. As old as they are I couldn't believe that they were all dead on for my needs and survived ups & fedex "gentle' handling lol
It wouldn't surprise me at all that the output level is still good.
What is a problem now with the 436A (at least on mine and with another A3 board I've tested) is that the sample and hold circuit for the auto-zero drifts excessively.? The 435A uses a very similar circuit to the 436A and I'd expect similar behavior.? In my case, the hold capacitor was excessively leaky - I dug it out of the potted circuit and tested it in a similar circuit (a source follower using a 2N7000).? I could get close to the original specs for the circuit with a very good teflon capacitor and a 2N7000, fairly close with a modern capacitor, but the original capacitor was terrible in comparison.? This is hard to test as given it's a MOSFET based source follower, the circuit is very temperature dependent.
Orin.
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Re: HP435 measuring head?
On 10/9/20 10:52 PM, Steve - Home wrote: Not a Cray but I had an Intel iPSC sitting in my living room for quite a while. Got a lot of attention from Intel and others. We would SO give that a home at LSSM, if you still have it, or know where it is. -Dave -- Dave McGuire, AK4HZ New Kensington, PA
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Re: HP435 measuring head?
Not a Cray but I had an Intel iPSC sitting in my living room for quite a while. Got a lot of attention from Intel and others.
Steve
WB0DBS
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On Oct 9, 2020, at 8:10 PM, Dave McGuire <mcguire@...> wrote:
?On 10/9/20 8:57 PM, N8AUM via groups.io wrote:
Interesting thread!
Dave, so how long did it take the Cray to balance ur checkbook? It was effectively instantaneous, as expected.
("ur"?)
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
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Re: HP435 measuring head?
On 10/10/20 3:25 pm, Dave McGuire wrote: ? They really are well thought-out designs.? Even FedEx and UPS can't kill them! Someone needs to tell FexEx and UPS that, because they still keep trying!
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Re: HP435 measuring head?
On 10/9/20 10:12 PM, N8AUM via groups.io wrote: ("ur"?
short for "your". Good heavens. Please don't do this, at least not here. To stay "on topic", I've collected 4 or 5 of the 435's just to have the cal. source that's inside. I know they are old and the freq. drifts on them but the output level is what I cares about when calibrating the sensor before I make any measurements. As old as they are I couldn't believe that they were all dead on for my needs and survived ups & fedex "gentle' handling lol They really are well thought-out designs. Even FedEx and UPS can't kill them! -Dave -- Dave McGuire, AK4HZ New Kensington, PA
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Re: HP435 measuring head?
On Fri, Oct 9, 2020 at 08:10 PM, Dave McGuire wrote:
("ur"?
short for "your". To stay "on topic", I've collected 4 or 5 of the 435's just to have the cal. source that's inside. I know they are old and the freq. drifts on them but the output level is what I cares about when calibrating the sensor before I make any measurements. As old as they are I couldn't believe that they were all dead on for my needs and survived ups & fedex "gentle' handling lol
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Re: HP435 measuring head?
On 10/9/20 8:57 PM, N8AUM via groups.io wrote: Interesting thread!
Dave, so how long did it take the Cray to balance ur checkbook? It was effectively instantaneous, as expected. ("ur"?) -Dave -- Dave McGuire, AK4HZ New Kensington, PA
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Re: HP435 measuring head?
Interesting thread!
Dave, so how long did it take the Cray to balance ur checkbook?
?
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Re: Hp 8563E analyzer for sale refurbished price 1725Euro
Hello Diego the unit is sold but I get them from time to time as I do refurbish them I can keep you in mind if you like
best regards Peter
Dear
I have sent you a PM on your address oz1lpr@...
BR
Diego Gustin
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Re: HP435 measuring head? kW's?
On Thu, Oct 8, 2020 at 07:24 AM, avvidclif wrote:
Bird
... well they're still for the birds, allegedly, IMO.
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Re: HP435 measuring head? kW's?
Hi N8ZM, et. al.:
Thanks for that.
I didn't know that Keysight (a.k.a. Agilent, a.k.a. HP) being a N.I.S.T. certified cal lab (through all the company's incarnations) was using cal equipment traceable to N.I.S.T!
Did you read the thread I posted: the one the OP above is referring to? (By the way, the OP didn't... yet spawned this orphan thread, the we are now embroiled in!)
Just because one sub-system of a system was "accurate," under N.I.S.T. laboratory conditions, at some N.I.S.T. certified lab, some time in the past... that does not mean the overall system being now used in the field is "accurate."
IMO it is gullible to maintain that a 20 year old, well worn, 150 USD 8481A, from some vendor, who tripped over it while dumpster surfing... and then added it to the Tiffany Lamp shades, he/she has for sale...on an online auction site. In my opinion, it is gullible to maintain that such a metrology device is now traceable to N.I.S.T.
Accuracy, precision, resolution, repeatability, robustness... these are all distinguishable. Guys/gals picking up that bargain HP power meter, at the hamfest... and now looking for a "head"... They might have forgot what they learned in their graduate school statistical metrology course.
And so, IMO, and allegedly... they are being taken advantage of by unscrupulousness vendors flying the caveat emptor flag.
If you buy an N8481A for about 1800 USD, or you send your bargain 6481A into Keysight for repair exor cal... then you'd still need cal on the hamfest power meter... and then you'd still have to use the right technique, under the right conditions, to get power measurements within Keysight's specs.
If someone thinks I'm wrong... I'm listening.
Best regards.
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6035A System PSU control board test connector??
I have here a 6035A System power supply and I want to run some performance checks and calibration if needed, and it seems I need a 'control board test connector' that comes in a kit with part number 5060-2865.
Now, I'm not too keen on paying Keysight the $764 they want for the kit, so I was hoping someone here might have one they can take some photos of so I could construct one of my own.
I suspect it may simply be a card that breaks out the connections on the card edge connector A2J7 inside the unit to allow for simple connection of test equipment, but I'd like to see it first so I can build it correctly without any guesswork.
Anyone here happen to have this part they can take some pictures of for me?
Thanks!
Jared
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Re: HP 853A - no CRT display at all - troubleshooting help needed
Thanks, that is good to know (in genera!) - I'll take a look at the waveforms from the test points on A6 (XYZ amplifier board) which drive the CRT and see if that suggests anything. Unfortunately, no spare 853A to use for comparison.
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Re: 4262A LCR Meter: 'Fail 2'
Looking at the 4262A schematic, the circuit topology for the A12 pcba is very similar to the A4 pcba in the 4261A but with slightly different components. That U2 IC is susceptible to damage because of its connection to the test terminals. I have replaced that U2 component on multiple 4261A's that exhibited temperature drift when I blew on that pcba during calibration. Although I have not experienced your particular error code, that op-amp component is a good candidate for replacement anyway.
--Ed
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Re: 4262A LCR Meter: 'Fail 2'
I've fixed both a 4262A and a 4274A. In both cases it was a bad JRC op-amp. I'll double check the error code from the 62 and see if it matched yours.
Dave Casey
On Thu, Oct 8, 2020, 10:06 PM Bruce Lane < kyrrin@...> wrote: Fellow techies,
? ? ? ? I'm troubleshooting a 4262A LCR meter which shows 'Fail 2' whenever I
try to run its self test for either capacitance or resistance/inductance.
? ? ? ? I've worked my way through the troubleshooting tree in the manual and,
at this point, I suspect failure of A12U2, a specialty op-amp originally
made by Harris.
? ? ? ? Has anyone else chased a similar problem and, perhaps, could offer
thoughts on what else might have failed? (If it turns out not to be the
OpAmp).
? ? ? ? Thanks much!
--
---
Bruce Lane, ARS KC7GR
kyrrin (at) bluefeathertech dot com
"Quando Omni Flunkus Moritati" (Red Green)
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4262A LCR Meter: 'Fail 2'
Fellow techies,
I'm troubleshooting a 4262A LCR meter which shows 'Fail 2' whenever I
try to run its self test for either capacitance or resistance/inductance.
I've worked my way through the troubleshooting tree in the manual and,
at this point, I suspect failure of A12U2, a specialty op-amp originally
made by Harris.
Has anyone else chased a similar problem and, perhaps, could offer
thoughts on what else might have failed? (If it turns out not to be the
OpAmp).
Thanks much!
--
---
Bruce Lane, ARS KC7GR
kyrrin (at) bluefeathertech dot com
"Quando Omni Flunkus Moritati" (Red Green)
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Thanks! Please no stress, we are still collecting....
Tam
With best regards
Tam HANNA
Enjoy electronics? Join 15k7 other followers by visiting the Crazy Electronics Lab at
On 2020. 10. 09. 4:47, Pete Manfre
wrote:
toggle quoted message
Show quoted text
Let me find them first.?
Pete
On Thu, Oct 8, 2020, 10:36 PM
Tam Hanna < tamhan@...> wrote:
Hello,
no issue re shipping and thanks for responding swiftly.
My African-American customer currently has an entire room
of her house in Georgia full of TMI I own. It is from
Raper's failed project mostly, think Gould Classic 6100, a
real time spectral analyzer and other things. Also, we
have over 100 used books.
We will use a LCL service to send it all, in a pallette.
So, what would be a price you would be willing to
entertain?
Tam
With best regards
Tam HANNA
Enjoy electronics? Join 15k7 other followers by visiting the Crazy Electronics Lab at
On 2020. 10. 09. 4:32, Pete Manfre wrote:
I do have already few PS for them on the
basement... But shipping to EU not really cost
effective.?
Pete?
Ft.? Mill,? SC , USA
On Thu, Oct 8, 2020,
10:23 PM Tam Hanna < tamhan@...>
wrote:
Hello,
two things, we would need:
a) an A10 assembly
b) a power supply
Tam
With best regards
Tam HANNA
Enjoy electronics? Join 15k7 other followers by visiting the Crazy Electronics Lab at
On 2020. 10. 08. 17:11, Pete Manfre wrote:
Several have asked about these
boards.? ?I found a list in the box of what
probably is in there¡ might have sold some years
past.? ?But will if interested in specifics.?
I have¡?
8pcs-? 08753-60208 post reg
1pc -? ? ? ? ? ? ? -60108? post
reg
1pc-? ? ? ? ? ? ? ?-60138 cpu
1pc-? ? ? ? ? ? ? ?-60125 cpu
8pcs-? ? ? ? ? ? ?-60957 ref
assy
4pcs-? ? ? ? ? ? ?-60012 ref
assy
1pc-? ? ? ? ? ? ? ?-60209 ref
5pcs-? ? ? ? ? ? ?-60170
graphics proc
7pcs-? ? ? ? ? ? ?-60068 freq N
digital
1pc-? ? ? ? ? ? ? ?-60057 FN
digital
5pcs-? ? ? ? ? ? ?-60013 FN
Analog
6pcs-? ? ? ? ? ? ?-60162 phase
lock
1pc-? ? ? ? ? ? ? ?-60082 phase
lock
1pc-? ? ?5086- 7413? ?sampler
8pcs-? ? ? ? ? ? ?-60164 pulse
gen
This is what I think is there.?
?Most I would guess at $40 ea? except new in
bag at $75ea,? cpu's $100ea,? sampler $100ea,
¡ all plus shipping.? ?Will consider offer or
trade for all¡ I hate scrapping these for the
gold¡ but if no one wants them they have no
value.?
Pete wa2odo?
A few pics¡ there's much more.?
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Armin Roesch
Dave McGuire
Jared Cabot
Bruce Lane