Author Topic: Restoration glory of Keithley 2001 DMM  (Read 139757 times)

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Offline benvei

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Re: Restoration glory of Keithley 2001 DMM
« Reply #175 on: February 26, 2015, 02:39:35 AM »
Which capacitor you talking about? C108?

Thanks for your reply!

Yes, i'm talking about C108.
 

Offline TiN

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Re: Restoration glory of Keithley 2001 DMM
« Reply #176 on: February 26, 2015, 03:08:54 AM »
You shorted mains thru CR101 by direct scope connection (alligator is earth connected).
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Offline benvei

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Re: Restoration glory of Keithley 2001 DMM
« Reply #177 on: February 26, 2015, 04:01:30 AM »
You shorted mains thru CR101 by direct scope connection (alligator is earth connected).

Yeah, i guessed that, but how could that happen? Since its an isolating transformer (i guess), and a full bridge rectifier?

Whats about my Idea to connect the transformer directly to the power switch?
 

Offline mmarks3141

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Re: Restoration glory of Keithley 2001 DMM
« Reply #178 on: February 26, 2015, 06:14:54 AM »
I worked on the firmware for the 2001 including the front panel menu design.  Here's something to try:

Before turning on, hold down FREQ + MATH and then power it up while holding these keys down.
Now press Menu -> General and go all the way to right (2nd page).
If you did it right, you get the secret menu that lets you view the design team and set memory options as well as mess with some analog settings I can't remember now.

If FREQ + MATH doesn't work, try powering on with TEMP + (LEFT ARROW) held down.  The exact key combo that unlocks the secret menu depended on the revision of the front panel microprocessor FW, but it will be either FREQ+MATH or TEMP+ LEFT
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Mike
« Last Edit: February 26, 2015, 07:15:07 AM by mmarks3141 »
 

Offline mmarks3141

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Re: Restoration glory of Keithley 2001 DMM
« Reply #179 on: February 26, 2015, 07:13:54 AM »
Rev A units were getting really tight on memory, so we only had enough space to list the software team.  Once we went to rev B ROMs, we could list everyone that had a hand in the project.  We also had an option to turn on a scrolling sales message intended for when the unit was sitting out at a trade show; that's why there's a plaintext list of features in there.

The MEM1 and MEM2 options used a Dallas Semiconductor RAM with a built-in battery; that's how they retained data with power off.  Even if you find the part, you have to initialize it with a secret menu command (see previous post) because marketing didn't want you buying a $50 part and plugging it in yourself when they could sell you the $500 option.  As I recall, you plug in the Dallas part, and then go into the secret menu and tell the 2001 what memory option you have.  It then writes the magic code into the Dallas part that lets the 2001 use it.
I wish I could recall the Dallas part numbers, but it has been too long.

This brought back some good memories of a good project team we had back then.

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Mike
 

Offline ManateeMafia

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Re: Restoration glory of Keithley 2001 DMM
« Reply #180 on: February 26, 2015, 10:50:30 AM »
Thank you for the great info. I just received a couple Ds1245Y nvrams a few days ago for my two good meters. I will test your instructions tonight and give feedback. This will be with Rev B roms B15 and one other (B10?)
« Last Edit: February 26, 2015, 12:39:42 PM by ManateeMafia »
 

Offline ManateeMafia

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Re: Restoration glory of Keithley 2001 DMM
« Reply #181 on: February 26, 2015, 12:38:47 PM »
I was able to confirm that the front panel init options does work and should be handy for people without access to a programmer.
 

Offline TiN

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Re: Restoration glory of Keithley 2001 DMM
« Reply #182 on: February 26, 2015, 03:40:01 PM »
Welcome Mike! Very happy to see here someone who should take credit for this great DMM :)

Secret menu works on 2002 too, and have some fun in it!
But init BB RAM did not help my case for clock NVRAM. Maybe DS1251 is not right one for MEM2 on 2002.

Will post more details on weekend.
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Offline mmarks3141

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Re: Restoration glory of Keithley 2001 DMM
« Reply #183 on: February 26, 2015, 11:53:42 PM »
The same key combination to get the secret menu will work on almost all Keithley products that have that same key layout, including the 2002, 7001, 7001, and 2400 family of products.  On those products with the 2-line VFD display, much of the front panel code and menu structure was able to be reused.

If you ever get ahold of a 7002 switch system, there is a shooting galley game hidden in there that uses the LED displays and the light pen.
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Mike
 

Offline lukier

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Re: Restoration glory of Keithley 2001 DMM
« Reply #184 on: February 27, 2015, 12:45:19 AM »
The same key combination to get the secret menu will work on almost all Keithley products that have that same key layout, including the 2002, 7001, 7001, and 2400 family of products.  On those products with the 2-line VFD display, much of the front panel code and menu structure was able to be reused.

Do you know any useful easter eggs like that for Keithley 2000/2015 series?
 

Offline mmarks3141

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Re: Restoration glory of Keithley 2001 DMM
« Reply #185 on: February 27, 2015, 01:12:23 AM »
The 2000/2015 series used the one-line VFD with "British flag" characters, so our menu options were much more limited.  If there is a secret menu in there, it would be accessed by those same two keys since they share front panel processors, but it has been too many years and I can't recall if the one-line display family has it or not.  If there is, then it would also be in the 2700 family as well.  I believe the 6517 and 2182 meters also have it since they share the two-line display.  The analog guys found that having some of these hidden options easily accessible without a magic SCPI command made their debugging a lot easier, and some options (like the design team) I put in just for fun.

The secret menu goes by key position, so if the key labels are different, then look at a 2001 front panel to see which 2000 keys would correspond to "FREQ+MATH" or "TEMP+LEFT" on the 2001.

The 2001 was my first project there when I started in 1991.  I worked on 2001/2, 2000, 2010, 2700, 7001/2, 2400 (& family), 6517, and 2182 during my 14-year tenure there.
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Offline TiN

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Re: Restoration glory of Keithley 2001 DMM
« Reply #186 on: February 27, 2015, 02:12:28 AM »
Hm, Close+Card does not unlock anything on 7001..
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Offline mmarks3141

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Re: Restoration glory of Keithley 2001 DMM
« Reply #187 on: February 27, 2015, 02:28:16 AM »
My bad there.  I forgot about the keyboards with the number pad.  The unlock for 7001/2 is in the number pad.  Try 2+6 or 5+9.  I know it's two keys diagonal to each other.  Less likely but possible might be 3+5 or 6+8.

« Last Edit: February 27, 2015, 03:03:47 AM by mmarks3141 »
 

Offline benvei

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Re: Restoration glory of Keithley 2001 DMM
« Reply #188 on: February 27, 2015, 05:30:58 AM »
Whats about my Idea to connect the transformer directly to the power switch?

Hey there!

I've looked into the service manual, there is a section, which tells, that there is a power regulation for the transformer. So i think connecting the transformer directly to 230V mains is not working, am i right?
 

Offline TiN

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Re: Restoration glory of Keithley 2001 DMM
« Reply #189 on: February 27, 2015, 05:49:25 AM »
My bad there.  I forgot about the keyboards with the number pad.  The unlock for 7001/2 is in the number pad.  Try 2+6 or 5+9.  I know it's two keys diagonal to each other.  Less likely but possible might be 3+5 or 6+8.

Not working (Firmware A09 A02 on my 7001). Tried 1+5, 4+8, 7+0, 9+0, 5+7, no secret stuff in general menu.
Model 2510 secret key is (T)+CONFIG :)
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Offline mmarks3141

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Re: Restoration glory of Keithley 2001 DMM
« Reply #190 on: February 27, 2015, 06:23:34 AM »
Weird, once I saw the number pad I thought for sure it was a diagonal combo of two buttons in the number pad for the 7001.  I emailed a couple software friends who also worked at KI during that time to see if their memory is better than mine.

It may be that the 7001 didn't have any back doors or need for the secret menu.  I know the 7002 does, because I put the light pen shooting game in there.

One of the products (2002 maybe or 6517?) includes a RAM editor and viewer in the secret menu.  That, along with a copy of the map file, would let you hand-edit any variables in the code :)
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Mike
 

Offline ManateeMafia

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Re: Restoration glory of Keithley 2001 DMM
« Reply #191 on: February 27, 2015, 06:59:38 AM »
@benvei,

Is there any reason not to diagnose and repair the AC selector circuit? Did you destroy any of the traces on the pcb?  Odds are that repairing the defective parts would be easier than rewiring the primary side of the meter.
 

Offline mmarks3141

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Re: Restoration glory of Keithley 2001 DMM
« Reply #192 on: February 27, 2015, 07:33:07 AM »
I finally had a chance to skim some of the older messages in this forum.  The reverse-engineering you guys have done is quite impressive; you know more about the analog boards now than I did :)

To answer an old question about Rev A vs. Rev B firmware:
Rev A was done on the older digital board with a single x16 EPROM; square package and 4Mbit I believe.
Rev B requires the newer digital board with two 4 Mbit x8 EPROMS.  We ran out of space in rev A when marketing asked for more features, so we had to go to bigger ROMs and a new digital board.  The 2002 also uses the same board, I think.

I saw someone found the SCPI command for the secret 8-1/2 digit mode for 2001.  The last digit isn't very meaningful; it was more of a display exercise when we were using 2001 hardware to mock up 2002 software before we had real 2002 hardware.  Looks cool, though.  I think if you power up with the secret menu code, then go under the normal menu where you set the number of digits (CONFIG -> DCV), you'll see that 8.5 digit is an additional front panel selection.  Many times I snuck things like this into a secret menu because it was faster than rounding up the GPIB card and cable when I needed to show a quick demo to the marketing guys.
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Mike
« Last Edit: February 27, 2015, 08:34:43 AM by mmarks3141 »
 

Offline mmarks3141

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Re: Restoration glory of Keithley 2001 DMM
« Reply #193 on: February 27, 2015, 07:43:23 AM »
On the 7001 secret menu access, try STORE + 6.  If that doesn't work, then I'm at a loss.
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Mike
« Last Edit: February 27, 2015, 07:56:35 AM by mmarks3141 »
 

Offline TiN

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Re: Restoration glory of Keithley 2001 DMM
« Reply #194 on: February 27, 2015, 12:49:52 PM »
On the 7001 secret menu access, try STORE + 6.  If that doesn't work, then I'm at a loss.
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Mike

Bingo. It shows "The Project Team:" thing on power on with 6+Store. No other goodies :)
Thanks for all valuable info!

I will post an article about secret menus in gear I have (2001 with A fw, 2001 with B fw, 2002, 2400, 2510, 7001, 2000)
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Offline mmarks3141

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Re: Restoration glory of Keithley 2001 DMM
« Reply #195 on: February 28, 2015, 12:16:03 AM »
The 2400 secret menu includes an option to set the product.  This allowed us to use one digital board and firmware rev for the entire family.  Of course, just because you say it's a 2420 or 2430 doesn't really give you those higher current or voltage ranges because they had different analog boards, but it's still pretty cool.  Again, we would use that for getting the display formatting right before the higher current and voltage models were available with real hardware.  That will probably apply to later revisions of 2400 firmware, but since the 2400 is flash-based, it should be upgradeable in the field.

On the 2001 rev A vs rev B, rev B will most likely have more hidden options because we had the ROM space to work with.  Not sure if the hidden 8.5 digit selection I mentioned earlier is available in both versions or just rev B.

The 7002 secret menu is probably the same as 7001 - my memory of diagonal keys on the number pad must be faulty.

I had a lot of fun with those secret menus.  Now that I'm doing medical device software, undocumented Easter eggs are strongly frowned on by the FDA, but those were the days :)
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Mike
 

Offline Smith

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Re: Restoration glory of Keithley 2001 DMM
« Reply #196 on: February 28, 2015, 03:22:33 AM »
I would love to know about easter eggs in keithley 2000 and 2700 series. Some people just don't need cant afford the 7.5 /  8.5 digit goodness  :-//
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Offline mmarks3141

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Re: Restoration glory of Keithley 2001 DMM
« Reply #197 on: February 28, 2015, 03:42:42 AM »
My memory on those isn't as good, since they were starting up while I was finishing on the 2-line display meters.  If there are any, then the key combination to get into it should be the same as the 2001, or at least those keys that map to the same positions of either FREQ+MATH or TEMP+LEFT.

The one-line segmented display didn't give us much room for creativity, so if there is a secret menu, it would most likely be for adjusting analog stuff or faking that certain options were installed.
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Offline mmarks3141

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Re: Restoration glory of Keithley 2001 DMM
« Reply #198 on: February 28, 2015, 04:54:07 AM »
For those with access to a 2002, I'm curious if my "HP Shooter" made it into the final firmware and is still there.  Accessible from the Secret Menu, this was a marketing-type display that showed the number 2002 shooting things at and obliterating the number 3458 (since the HP3458 was seen as our target competition).  The 2002 also had a 3548 emulation mode for the GPIB commands.
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Offline TiN

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Re: Restoration glory of Keithley 2001 DMM
« Reply #199 on: February 28, 2015, 12:11:08 PM »
Yes, HP shooter and HP Killer all there :). I recorded video of secret menus already, will post later. Not sure if my firmware final, its A09.
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