HP LCR/LCZ Comparator Handler Interface Recreation: 16064A

[squadchannel]

Now, that helps with the two "mystery IC" U10 / U11.
While still nothing is found for their part number 1990-0557 / 1990-0602, the schematics include enough clues to find a fitting replacement.

U11 1990-0602 was informed by keysight's parts finder. It is still available today. ($10)
IF=20mA VF=1.75V BVR=5V


Search is on for U10 1990-0557.

MOD:
1990-0602 is also called 5082-4361 (4284A SM) and 5082-4361 is equivalent to HCPL-2601 (from the data sheet).

[TERRA Operative]

....but if you want the raw scan I can upload that to oneDrive.  It's too big to upload here

Yes please! 



U10 looks like a dual optocoupler, could possibly be replicated with two discreet modern optocouplers?
[EDIT] I'm gonna say this one is a dual channel open-collector optocoupler.
The Broadcom/Avago HCPL-2630-000E and HCPL-2631-000E (latter has better common mode transient immunity) are pin compatible, see page 5 of the datasheet.
I think the Vishay VO2630, VO2631, and VO4661 are all worth checking out too, and they are cheaper than the Broadcom part.
(The three parts have different common mode transient immunity and propogation delays, I don't think these specs are overly important in our application)

U11 is something funky, is that a NAND gate with an optocoupler on one input? Maybe something like an NTE3087? I wonder if there are modern equivalents?....
[EDIT] How about a 6n137? It looks pin compatible from a quick glance at the schematics...
Seems the 6N137, VO2601, and VO2611 are all pin compatible here too.

[squadchannel]

U11 is HCPL-2601 as I mentioned.
1990-0602 is listed as 5082-4361 on the 4284A SM. The commercial part name is HCPL-2601.
The HCPL-2601 appears to be an optocoupler with a built-in AND gate.

U10 is listed as an LED matrix display according to keysight Find-A-Part. Absolutely not.

[TERRA Operative]

U11 is HCPL-2601 as I mentioned.

You did too, I completely missed that...
Looks like they are under US$3 in quantity 1 from Mouser (Digikey has them on backorder).

Well in that case, if U11 is a HCPL-2601 (the single channel type), I'd bet that U10 would probably be a HCPL-2631 (under US$5 each from Mouser) as it is the dual channel version of U11 with equivalent ratings.

[squadchannel]

Well in that case, if U11 is a HCPL-2601 (the single channel type), I'd bet that U10 would probably be a HCPL-2631 (under US$5 each from Mouser) as it is the dual channel version of U11 with equivalent ratings.

The internal circuit of the HCPL-2631 consists of transistors, so it should work fine.
One concern is that if the limiting resistor on the emitting side is 180ohm as shown in the original schematic, little bit more current will flow.
According to the HCPL-2631 datasheet, VF=1.4V when IF=10mA. 360ohm is optimal for 5V operation. 20mA will flow with 180ohm. The absolute maximum rating is 30mA, so i don't think there is a problem.

[ZGoode]

....but if you want the raw scan I can upload that to oneDrive.  It's too big to upload here

Yes please! 

Here ya go.  It's too big for eevblog, so here's a link to the pdf on onedrive.
https://1drv.ms/b/s!ArWjp3tSVzUzmK1EsulqLrGYfy9weg?e=zTAjcr

[TERRA Operative]

Here's the cleaned up version of the manual.
I uploaded it to the HP-Agilent-Keysight Groups.io as it's just a little to big to upload here. (I didn't want to crunch it down too much).

https://groups.io/g/HP-Agilent-Keysight-equipment/files/All%20HP,%20Agilent%20and%20Keysight%20instruments%20in%20folders%20by%20part%20numbers/A%2010000%20to%2019999/16064A

[ZGoode]

Here's the cleaned up version of the manual.
I uploaded it to the HP-Agilent-Keysight Groups.io as it's just a little to big to upload here. (I didn't want to crunch it down too much).

https://groups.io/g/HP-Agilent-Keysight-equipment/files/All%20HP,%20Agilent%20and%20Keysight%20instruments%20in%20folders%20by%20part%20numbers/A%2010000%20to%2019999/16064A

That looks awesome!  What's your process like for cleaning up pdf's?  I have a horrible scan of a manual that I've been trying to clean up with acrobat pro and scantailor, but haven't had much luck.  Unfortunately, I can't find any better scans online due to the age of this device

[TERRA Operative]

I use Photoshop and Acrobat.
Usually I separate the pages into two folders, one for left pages, one for right pages (The text is often offset away from the spine of the book to allow space for the holes for the folder).

Then I set up a script for each side in Photoshop that adjusts the Levels to crush the text to black 'just enough' and the same with the whites to remove the paper texture etc. Also in the script I set up marquees to delete any visible page edges and hole punches etc (This is where I find the separate left and right scripts are needed). Then finally I crunch the colour space to 'Indexed Color' with 16 shades of grey (you can go to monochrome bitmap like many other manuals around the net are for smaller file sizes, but we aren't hurting for storage space these days and 16 colour grayscale looks much nicer). If there are colour pages, I'll adjust the colour space for just those pages as needed.
Then I run the script on the pages, saving as png.
After inspecting the pages for problems or errors etc and correcting as needed also a quick overview for any left-over blemishes (like from a smudge or dirt on the scanner), I drop them into Acrobat and set up the bookmarks and page numbers etc. Also, I delete the blank white images from any blank pages to save some more file size.

Then I kick out an optimised pdf (with the image settings turned off because we already took care of it in Photoshop) to strip out any extra unneeded junk and it's done.

Some manuals need schematics stitched together and bad scans repaired etc so it can get manual and tedious sometimes, but good colour scans in 600dpi make a world of difference (your scans were actually pretty nice!)
The colour scan makes a difference as the paper texture is often yellowish so is easier to remove than grayscale against the black text in the case of a grayscale scan.