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The following files and folders have been uploaded to the Files area of the [email protected] group. * /HP3852A ROM kit Ver 4_200 Part 1.pdf (

The following files and folders have been uploaded to the Files area of the [email protected] group. * /HP3852A ROM kit Ver 4_200 Part 2.pdf (

The following files and folders have been uploaded to the Files area of the [email protected] group. * /Hp 3852a v4.22 Rom set rick/U57_Rev422.hex (

I'm considering using one for a project at the museum. A work project, not an exhibit; it will be doing real work in the restoration area. They are great little machines for automating real-world

At the end I want to have a good image of V4.22 posted in the file section so people can use it in the future without issues.? I don't think a lot of people will ever update these units but why not

Here is the unit running on the V4.21 with 27C512 chips on all positions (the images provided are all the same size 64k). No error messages with V4.21.? But cannot boot on V4.22. Maciej

Here is the HP? modification instruction : Here is the difference between the 27C512 and 27C256. Notice the extra address line A15.? HP makes us connect that pin to the RP4 which is probably the

Dave In my opinion the issue is that some of the roms after 4.0 became 27c512 . That is why there is a need for added modifications via wires to the U57 and U58. The roms in version v4.22 are all 32k

I've been able to solder wire-wrap wire to SOT-23 packages with the aid of a magnifying headband. Recently I replaced burnt-out diodes in my HP 400D AC Voltmeter with BAT62's. Dave

On 5/5/24 13:40, Maciej Kawalkowski, Liberty Electronics Design and Service LLC wrote: > I did follow the? instructions on www.dalton.ax <http://www.dalton.ax> and that seems to be the issue.?? I

Just be aware that the -281x series is rated for 20V, so you get a reduced capacitance at the expense of a reduced voltage rating for the probe. The BAT62 that Dave Wise mentioned has a lower

It would certainly be nice to use HP glass diodes for the repair and I only have to find two of them :) I think the capacitance of the classic 70V 5082-2800 will be too high. Also, I've already got a

The old Philips (NXP) 1PS70 diode looks quite good on the datasheet. The IV curve isn't quite the same as the 8405A but I think it will have similar capacitance when reverse biased and the dynamic

Many years ago, I repaired a lot of 3406A and 8405A to 1 GHz operation. I used 5082-2800 series diodes. I had matched quads from HP at that time for some of the repairs, and matched diodes for others.

I've just done some basic 1 port tests of the 1N6263 and the 8405A probe diode in various forward and reverse bias conditions and the 8405A is clearly a different diode to the 1N6263. The capacitance

I think you want these https://www.mouser.com/ProductDetail/EDAC/305-030-520-202?qs=U4pz39agNJAeH5Ar2TraIg%3D%3D --------------- 305-030-520-202 ---------------

I was at the electronics store but they did not have any 30 position ones. A lot of other ones were available.

I thnk Ed meant, schematics and info for the HP product it was used in.? (The HP8720B) That should tell you what is needed to use it correctly. Nothing like a little reverse engineering from a good

@ Maciej Kawalkowski ( /g/HP-Agilent-Keysight-equipment/message/144093 ) Thank you for this information. I see these are available in the Mouser catalogue.

The Cinch number you provided does match those on the motherboard. The ones on eBay do look like the originals. What would be the difference between the '301' of these and the '341' of the