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Hello Yves_Tardif,
unfortunately my initial answer bounced from the email address you sent me your program.
Thanks for your program. The 5350B is really a weird beast!
I made some initial tests on friday following your instructions. At first not working. Had to remove checkmark in Keysight Communicator -> Settings -> "Enable Keysight GPIB cards for 488 programs". Now it worked, but some measurements showed "0".

Over the weekend I was busy with other obligations. So I tried again today with no success. Hitting "Stop" did not work so I could not select Input 2.
Input 1 not working because of fried sampler. This was the reason the counter was donated to me.

Regards Ernst?

Hello there!

Just bought a few plugins and another mainframe for 8660 system. One of the plugins have coax and normal pins missing in the conector and want to repair it.

There is a chance to know type and part number or a vendor who sell them (new or used)??

Best regards,
Ruben

Keith Hallman has a large selection of Capacitor catalogs & data sheets with some Engineering Bulletins:
... scroll down, past the various Cat. cover photos.
( extensive & very helpful, ... but some Engineering & Technical Bulletins missing? ):



-- Anyone know of other extensive component catalog collections ?

Hi Richard,

Alas, I think you may have learned the wrong lesson.

The proper lesson, IMHO, is don't connect the 410B's
AC ground clips to anything but a locally grounded,
chassis ground.

It's been a long time since I explored these meters,
and their problems, but there are some serious safety
issues, in my opinion.

The 410C is safer than the 410B, but in both, HP punted
on safety in my opinion.

Ordinarily, the 410's, in DC modes, have the guts of the
meter floating relative to the case. That means you can
get away with hooking the "common" lead to 400V relative
to ground, and still be safe.

AC wrecks all of that.

When the meter is put into the AC mode, the common lead
becomes connected to chassis ground, in preparation for
the grounded AC probe, and its body.

This can cause quite a surprise if you have the common
lead connected to something that is elevated from chassis
ground, as poof your meter's switch burns up.

At least with the "C" model, you can unplug the AC probe,
but you still can't solve the AC function position issue.

-Chuck Harris


On Tue, 18 Jun 2024 08:01:33 -0700 "Richard Knoppow"
<dickburk@...> wrote:

Well, you answered my question, namely how hot do the probes get.
The EA35 draws slightly more power than the 2-01C but both are close
to 2 Watts so probably probes with either will feel the same. I
wanted to make sure the correct voltage setting for the EA34 was 6.3
Volts and evidently it is.
The handbook is full of warnings about the meter chassis and
ground connections going to power line ground. I have a 3 to 2
adapter on the power plug to mine. Actually, I learned about this
problem long ago when my main mentor blew his 410B up by grounding
something.

On 6/18/2024 6:51 AM, Chuck Harris wrote:

P = I x E

6.3V x 0.3A = 1.9W

The probe's body provides a bit of heat sinking, but the 2W has
to go somewhere.

Cradle your hand around a 2W resistor running full power, and
get back to me ;-)

Heat is the main reason why 410C's are always missing their AC
probes. The probe gets uncomfortably hot, so it gets removed
and stored in a safe place when it not being used.... never to
be found again.

The other reason the probes get removed and lost is they are
practically useless for everyday measurements. The probe body
is also the probe's grounded return lead. It isn't safe to
willy-nilly ground AC power circuits, as you have to do to use
this probe.

-Chuck Harris

Well, you answered my question, namely how hot do the probes get. The EA35 draws slightly more power than the 2-01C but both are close to 2 Watts so probably probes with either will feel the same. I wanted to make sure the correct voltage setting for the EA34 was 6.3 Volts and evidently it is.
The handbook is full of warnings about the meter chassis and ground connections going to power line ground. I have a 3 to 2 adapter on the power plug to mine. Actually, I learned about this problem long ago when my main mentor blew his 410B up by grounding something.

--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998

P = I x E

6.3V x 0.3A = 1.9W

The probe's body provides a bit of heat sinking, but the 2W has
to go somewhere.

Cradle your hand around a 2W resistor running full power, and
get back to me ;-)

Heat is the main reason why 410C's are always missing their AC
probes. The probe gets uncomfortably hot, so it gets removed
and stored in a safe place when it not being used.... never to
be found again.

The other reason the probes get removed and lost is they are
practically useless for everyday measurements. The probe body
is also the probe's grounded return lead. It isn't safe to
willy-nilly ground AC power circuits, as you have to do to use
this probe.

-Chuck Harris


On Mon, 17 Jun 2024 21:03:32 -0700 "Richard Knoppow"
<dickburk@...> wrote:

I posted before about the heater voltage for the two different RF
rectifier diodes and noted that indirectly heated tubes are supposed
to be run close to the specified voltage. I note that this isn't
always true, V-2, the input DC amplifier of the 410B being an
example. this tube is run at about 4.5 VAC. I think the reason is to
reduce contact potential. V-2 seems to be very sensitive to being
gassy. The instruction book describes how to choose tubes with
minimum gas. I think the low heater voltage has the purpose of
reducing the effect of gas on contact potential. This same trick is
used frequently on 6H6 and 6AL5 tubes used as detectors and noise
limiters to reduce induced hum. My original question had to do with
the heater voltage for the EA-53. The handbook and the data sheet for
this tube specify 6.3 volts where the earlier Eimac 2-01C specifies 5
VAC. My 410-B has the Amperex EA-53 in it. The heater had been set at
about 5.5 VAC so I reset it to 6.3 Volts. Did not seem to make a
difference but the probe gets rather hot. I wonder if this is normal.
It gets quite warm at 5 Volts and my memory of other 410B probes is
that they run hot. Please comment. I find nothing in the material at
-hp- Archive pertaining to this. I am assuming 6.3 V is correct and
will leave it there unless someone has definite contrary information.
The calibration seems very accurate. This thing is an ancient war
horse but its a favorite and I have put a fair amount of work into
it. Mine is a very early version with a smooth-edged front panel.

Also, Sprague put out a series of what were called "Service Sheets" or something similar that went into detail on the performance of various series of their capacitors - they are very scarce and it would be wonderful if anyone that has any would upload them to the group.

I uploaded several Sprague catalogues that have a limited amount of information on various models:

/g/HP-Agilent-Keysight-equipment/files/Components%20&%20Connector%20Catalogues

Also covering Sprague as well as other manufactures are the Radio's Master series:



Hal

I posted before about the heater voltage for the two different RF rectifier diodes and noted that indirectly heated tubes are supposed to be run close to the specified voltage. I note that this isn't always true, V-2, the input DC amplifier of the 410B being an example. this tube is run at about 4.5 VAC. I think the reason is to reduce contact potential. V-2 seems to be very sensitive to being gassy. The instruction book describes how to choose tubes with minimum gas. I think the low heater voltage has the purpose of reducing the effect of gas on contact potential. This same trick is used frequently on 6H6 and 6AL5 tubes used as detectors and noise limiters to reduce induced hum.
My original question had to do with the heater voltage for the EA-53. The handbook and the data sheet for this tube specify 6.3 volts where the earlier Eimac 2-01C specifies 5 VAC. My 410-B has the Amperex EA-53 in it. The heater had been set at about 5.5 VAC so I reset it to 6.3 Volts. Did not seem to make a difference but the probe gets rather hot. I wonder if this is normal. It gets quite warm at 5 Volts and my memory of other 410B probes is that they run hot. Please comment. I find nothing in the material at -hp- Archive pertaining to this. I am assuming 6.3 V is correct and will leave it there unless someone has definite contrary information. The calibration seems very accurate.
This thing is an ancient war horse but its a favorite and I have put a fair amount of work into it. Mine is a very early version with a smooth-edged front panel.
--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998

my goof:

most likely: Tantalum glass sealed (dry ?) ?(? Not:? steel, silver, Aluminum ? ) Axial capacitors,?

.... and for .pdf's of? the?? CS-13?? series & any other Mil Spec hermetic glass sealed axial caps.

thank you !

Yes, I have seen the Vishay "Sprague 150D" specs:



-- am looking for the actual Mfr. catalogs of the original older ones having the above stated "unknown" nomenclature.

Trying to decipher the values, P/N's of Mil Spec Hermetic capacitors !

I need some .pdf of catalogs:

These are the small cylindrical hermetically sealed ( steel, silver, Aluminum ? ) Axial capacitors,
?? one end having a glass-seal used in many older Hp units ( Hp 8566b, etc. )

eg.)? " 39003 02-K 2036J +008 ML "? etc. ? ?
?????????? 39003 01-? ####?

????? ...? many #? I want to ID?
?????????? so want an understanding the ordering nomenclature of these older components, Specs, etc.

Anyone have ? .pdf's? of? the capacitor Catalogs of these? Mil Spec hermetically sealed capacitors ?

Guessing Mfr's might be: ? Mallory, Sprague,? others ?

thank you,
rick

To be honest, I'm never really certain when I should use the 50 ohm input or the 1Meg setting. Certainly if I'm taking a signal from a BNC anywhere on the analyzer and feeding into the scope directly via a bit of coax, I'm going to use 50 ohm. But if I'm using a probe on a pcb trace (which I'm doing with the 500kHz signal) I'll use the 1 Meg input. I believe that's correct. Also if I'm sniffing signals using a tee then I'll use 1Meg so as to not overload the source.

That would explain the screws; thanks!
The 500kHz pulses look fine now, having changed the test methodology.
I am seeing intermittent 5V pulses of 5ms duration on HUL2, but they disappear when the sweep's turned off. I only mention this because IIUIC, the voltage on HUL2 should be near zero at all times if that loop is locked. Though they've provided LEDs to show lock for PLL1 and PLL3, they haven't for PLL2, so testing HUL2 is the only way of telling. Anyway, if there was an issue with PLL2 a separate message would come on the screen to say so and there's only "YTO Unlock" - which is present and flashing regardless of the selected frequencies and spans. It's right across the whole range.

The reason for all of the screws in the A6, A7, A8 sections is to prevent RF leakage which would show up in the noise floor and as spurs.

Thanks. I should really have posted a picture of the scope display. I'll do so tomorrow when I get a moment.
I'm also awaiting the arrival of an SMB 'tee' in the post. This will enable me to break PLLs and eaves-drop on what's going on between the various RF sections. I would have liked to have pulled out one of the PLL2 boards to inspect it, but they don't seem to want to come out for some reason. These are the ones held in place by two screws at each end plus four more shared with the adjacent boards. Rather OTT secured IMV but they must have had a good reason for doing that I guess.

It's probably just fine. Lower frequency signals in a synthesizer are often from digital dividers and such anyway, so squarish can be OK, with the info on the edges of the waves. The manual should show enough to estimate the proper shape. The 500 kHz seems right.

Ed

Hi all,

There's a "500kHz Reference" test point hole cut into the clear plastic sheet which covers the PCB of the main unit of this analyzer. I'd expected this would be a sine wave when scoped, but instead I'm seeing a distorted square wave with a period of 2 microseconds. Is that normal?

Thanks!

J.