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Re: Transistors for the A17 voltage regulator 8642B

 

what voltages are you measuring on the 5 supply rails on the edge of A17?

remember if you decide to take the power supply out and disconnect it from the instrument (ribbon cable that goes to A5)?
you must connect the sense lines at each rail to the supply line
otherwise the voltages will be all over the place (no regulation)
Re: Transistors for the A17 voltage regulator 8642B

 

I performed a different test to check the 3 2N4101 SCR's, thanks for the correction. I powered them up with a DC supply and the load was a small bulb at 9V, when I touch the gate the SCR latches and the the bulb glows, all 3 are just fine. I attached a data sheet for these transistors which allowed me to run this test

2N4101 SCR.pdf
2N4101 SCR.pdf

Re: HP8663A Power supply, was: Firmware difference

 

I think you are going to want better supplies than the inexpensive mean-wells SMPS, HP used linear power supplies for a reason and that was there are no HF components on the DC supply rails to cause noise problems in the circuits.


One place they deviated from that was the 70000 series where the main chassis was a massive SMPS

Content by Scott
Typos by Siri
Re: Transistor Devices Dynaload DLF50-85-500

 

For anyone interested in the other going for $175 on eBay from the link above, you can make an offer below that, mine was $140 and they accepted that if your interested. Perhaps it can be had for $130 or even $120, good luck.
Re: Transistors for the A17 voltage regulator 8642B

 

He was referring to Q4,Q7,Q10,Q13 on the A17 board and I clearly remember them being thyristors
I dont remember their part numbers but 2N4101 rings a bell
one of them is different than the other 3 but they are all thyristors and are parallel to the supply rails for over voltage protection
there is another thyristor on that board which is a can shape (TO-205 perhaps) for the 50V rail

all pass transistors are mounted on the right side of the board on a big heatsink.
Re: Transistors for the A17 voltage regulator 8642B

 

Typo
2N4101 is an SCR and subject of OP.
(2N4401 is transistor and typo by Sergey)

Robert G8RPI.
Re: Transistors for the A17 voltage regulator 8642B

 

There seems to be some confusion here on just what number is being discussed.
Are we talking about a 2N4401, or a 2N4101???? The 4101 is an SCR, and the 4401 is a NPN transistor (TO-92), and I suspect one of the posts had a typo in it.
I think we should be discussing the 2N4101 here.


Daun

Daun E. Yeagley II, N8ASB

On 10/29/2018 8:34 AM, Goran Finnberg wrote:
Sergey Kubushyn:

2N4401 is _NOT_ a transistor. It is THYRISTOR aka SCR.
Sorry, no.

The 2N4401 is an NPN transistor.

Datasheet here:

www.onsemi.com/pub_link/Collateral/2N4401-D.PDF

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

Best regards,

Goran Finnberg
The Mastering Room AB
Goteborg
Sweden

E-mail: mastering@...

Learn from the mistakes of others, you can never live long enough to
make them all yourself.??? -?? John Luther

(\__/)
(='.'=)
(")_(") Nero & Smurfen:RIP
Re: HP5000A Logic Analyzer

 

This comment from the HP Memory Project is enlightening
"Even if presented as a standalone Logic Analyzer instrument, reading the HP Journal article clearly reveals that the 5000A was first of all a sophisticated digital trigger to be used with a companion oscilloscope."
Article is in October 1973 issue of the Hewlett Packard Journal.

Robert G8RPI.
Transistors for the A17 voltage regulator 8642B

 

Sergey Kubushyn:

2N4401 is _NOT_ a transistor. It is THYRISTOR aka SCR.
Sorry, no.

The 2N4401 is an NPN transistor.

Datasheet here:

www.onsemi.com/pub_link/Collateral/2N4401-D.PDF

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

Best regards,

Goran Finnberg
The Mastering Room AB
Goteborg
Sweden

E-mail: mastering@...

Learn from the mistakes of others, you can never live long enough to
make them all yourself.??? -?? John Luther

(\__/)
(='.'=)
(")_(") Nero & Smurfen:RIP
Re: Transistors for the A17 voltage regulator 8642B

 

On Sun, Oct 28, 2018 at 08:14 PM, <wilson2115@...> wrote:
My question concerns the 2N4101 PRX TO-66 transistors in which 3 have been blown open. . The part number and package appear correct other than being a different brand, I believe this should work.. And below if your curious about my findings so far. Below is additional information if your interested

Here is my findings so far from a misaligned power connector from the rectifier board to the regulator board, causing the regulator board to stop working and smoke smoke to come out.

here is the suspect transistors I found so far are as noted on the schematics I studied for A17 which you can see in the attachment
U10 1884-0065 PRX (Located just right of connector J2)
U7?? 2N4101 PRX (Located directly above C15)
U13 2N4101 PRX (Located just right of U7)
U4?? 2N4101 PRX (Located beside C15)

I checked other various transistors in circuit with a multimeter diode test feature for shorts or if open in circuit, they appear to be fine.
those are thyristors and extremely tough to break. more than likely they are not broken. forget those.

what are the symptoms? which rails are not working? there are +/- 15V, +/- 5.2V, and 50V rails
you can measure them all on the test points on the top edge of the A17 board
Re: HP 8341A - increase output power

 

Hi,
yes, as long as the unleveled annunciator is off, the power is accurate and within spec, for both the CW mode and the sweep mode.
So I guess the ALC loop does work in principle.
However, when sweeping to 20GHz with more than 0dBm puts the unleveled annunciator on sometimes. But it also slightly depends on the sweep time - for longer sweep times, it works better than for the real short ones. So it looks like the ALC loop is a bit too slow.
I also saw in the datasheet, that the sweeper should be able to provide +10dBm up to 20 GHz, which mine clearly can't. So I will try to debug the ALC loop. The power supplies are all fine.
But I am still wondering whether it would be possible to add, say, an additional Minicircuits amplifier to increase the output power to +20 dBm.

Concerning the service manual: that one found on the Keysight website is unusable because the schematics are unreadable. As you said, Artek has only the manual for the B version, and I wonder, how different the A and B versions really are.
(Would it probably be even possible to retrofit an A to a B instrument? the B has additional FM capability, which would be nice.)
Re: HP 8657D signal Generator

 

Hi Ken
The D version goes to 1030MHz and the B version has the doubler to 2060MHz.
I have the GMSK and the DQPSK Modulators for the 8657D on eBay UK at the moment.
Regards
Steve

On ?Sunday?, ?October? ?28?, ?2018? ?12?:?44?:?54? ?PM? ?GMT, KEN WRIGHT via Groups.Io <ken.h.wright@...> wrote:


Dear All.
I have just seen the following HP Signal Generator for sale in the UK at a very reasonable price:
HP 8657D TT/4 DQPSK Signal Generator. Would this item be a suitable replacement for my faulty HP 8656A??

Regards.

Ken Wright
Re: Transistor Devices Dynaload DLF50-85-500

 

? I have a TDI Electronic Load but I don't have any experience with the model TDI load you are looking at.? I have an old DLR50-15-150A (50V, 15A 150W) that I have had for many years and it still works well.? I recently used it to do some "high-current" USB port load testing on a new product at my former employer.? The one I have has a modulation input that will allow you to program the load current remotely with a 1V to 6V DC input.? I want to use my 33120A Arbitrary waveform generator to simulate a changing/dynamic load someday.? I'm not looking to do anything too fast or large transitions, but if it could simulate a bit of inrush and provide stepped-current loads it would add some versatility.
? The one you are looking at has digital meters which would be nice, mine has mirrored analog meters which are remarkably accurate and easy to read.? I just add a couple of DMMs to get more resolution, quicker readings, or min/max when needed.?

Clay
Re: Transistor Devices Dynaload DLF50-85-500

 

¿ªÔÆÌåÓý

I have a couple (different models) and have used some professionally in the past.

Built like tanks.? Almost all electrical parts are off the shelf.

Schematics available for at least some of them.


On 10/28/2018 12:19 PM, wilson2115@... wrote:

I am looking at a DC electronic load and have come upon a Transistor Devices Dynaload DLF50-85-500, does anyone have experience or thoughts on this?

Re: Transistors for the A17 voltage regulator 8642B

 

On Sun, 28 Oct 2018, wilson2115@... wrote:

My question concerns the 2N4101 PRX TO-66 transistors in which 3 have been
blown open. I found possible replacement parts here (

). The part number and package appear correct other than being a different
brand, I believe this should work.. And below if your curious about my
findings so far. Below is additional information if your interested

Here is my findings so far from a misaligned power connector from the
rectifier board to the regulator board, causing the regulator board to
stop working and smoke smoke to come out.

here is the suspect transistors I found so far are as noted on the
schematics I studied for A17 which you can see in the attachment
U10 1884-0065 PRX (Located just right of connector J2)
U7?? 2N4101 PRX (Located directly above C15)
U13 2N4101 PRX (Located just right of U7)
U4?? 2N4101 PRX (Located beside C15)

I checked other various transistors in circuit with a multimeter diode
test feature for shorts or if open in circuit, they appear to be fine.
2N4401 is _NOT_ a transistor. It is THYRISTOR aka SCR. It has only one
junction you can check with ohmmeter (and that should be in special "DIODE"
mode to have sufficient voltage to get that junction conduct) -- it is
GATE/CATHODE that should conduct in one direction. ANODE/CATHODE junction
should _NOT_ conduct in _ANY_ direction when checked with ohmmeter unless
you inject enough current into GATE/CATHODE to trigger it. 2N4401 withstands
600V ANODE/CATHODE voltage without opening if not triggered.

I'm almost 100% sure your 2N4401s are all OK.

---
*
* KSI@home KOI8 Net < > The impossible we do immediately. *
* Las Vegas NV, USA < > Miracles require 24-hour notice. *
*
Re: Transistors for the A17 voltage regulator 8642B

 

They look promising, but I have had issues with parts not from distributors.

If they don't work out, an octopart search finds this:


I've bought from Quest before. Not cheap, but the parts are likely to work.

Regards,

Mark


On Sun, Oct 28, 2018 at 8:14 PM <wilson2115@...> wrote:
My question concerns the 2N4101 PRX TO-66 transistors in which 3 have been blown open. . The part number and package appear correct other than being a different brand, I believe this should work.. And below if your curious about my findings so far. Below is additional information if your interested

Here is my findings so far from a misaligned power connector from the rectifier board to the regulator board, causing the regulator board to stop working and smoke smoke to come out.

here is the suspect transistors I found so far are as noted on the schematics I studied for A17 which you can see in the attachment
U10 1884-0065 PRX (Located just right of connector J2)
U7?? 2N4101 PRX (Located directly above C15)
U13 2N4101 PRX (Located just right of U7)
U4?? 2N4101 PRX (Located beside C15)

I checked other various transistors in circuit with a multimeter diode test feature for shorts or if open in circuit, they appear to be fine.

Re: (E6640A) M9430A Agilent PXIe LabView drivers?

 

Managed to extract M9430A Windows 7 64-bit drivers from the E6640A?XSA installer off Keysight website. Now shows up in device manager and is found by VISA. For NI VISA to see it, you must install the horrible Keysight IO libraries. They seem to have removed handy features from the older Agilent version & have no idea how to write an uninstaller - leaves rubbish all over the hard drive and in the registry.?

Now to see if I can write some useful tools to get this Vector Signal Transceiver cracking...

73s de chris zl1cvd?
Transistors for the A17 voltage regulator 8642B

 

My question concerns the 2N4101 PRX TO-66 transistors in which 3 have been blown open. . The part number and package appear correct other than being a different brand, I believe this should work.. And below if your curious about my findings so far. Below is additional information if your interested

Here is my findings so far from a misaligned power connector from the rectifier board to the regulator board, causing the regulator board to stop working and smoke smoke to come out.

here is the suspect transistors I found so far are as noted on the schematics I studied for A17 which you can see in the attachment
U10 1884-0065 PRX (Located just right of connector J2)
U7?? 2N4101 PRX (Located directly above C15)
U13 2N4101 PRX (Located just right of U7)
U4?? 2N4101 PRX (Located beside C15)

I checked other various transistors in circuit with a multimeter diode test feature for shorts or if open in circuit, they appear to be fine.

8642B A17.jpg

Good voltage cal lab in SW Ohio?

 

I'm looking for a lab in southwest Ohio that can provide a trustworthy with-data cal of an HP-3456A.? I'd rather drop off and pick up than ship the unit.

Any recommendations?

Thanks,
John
Re: Transistor Devices Dynaload DLF50-85-500

 

Sounds like a winner, thanks
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