Here is my kick at the can while I ponder.....
- Service commands for 4000, 4000A, 4200, 4700 and 4800 calibrators and also 4920 and 4950 meters for dumping/saving calibration NVRAM and restoring it via GPIB
- Data structure and location of the cal values in the NVRAM in both DMMs and calibrators, documentation?
- Is the NVRAM cal data format and location the same/static across the firmware revisions? (So if one upgrades the firmware on a unit does it invalidate the cal constants or are
they still valid?)
- Hidden or undocumented service commands for the 12X1, 49X0, 4000, 4000A, 4200, 470X and 480X equipment
- Is there any special servicing software for any of the above equipment?
- Is there service manuals/schematics/documentation for the 4920AVMS, 4922 Wide band module and 4950 meters. (4920M service is out "there", I can't find anything on the
4920AVMS and 4950 service manuals/docs) I find this particularly vexing.....
- Is there any user/service docs/schematics for the 4707?
- Any documentation of the 1271 OPT10 and OPTION 12 boards?
- Are there programming documentation/files to create or recreate any of the FPGAs, PALs or GALs used in the equipment?
- Any service/voltage/waveform notes for troubleshooting the above equipment?
- Any documentation on the serial communication structure/protocols used on the 470X/480X/12X1/49X0 for the displays and also the serial communication to the various boards?
- Service bulletins for any of the above equipment, including any component changes or equipment enhancements
- Was there differentiation in selection of components/boards to increase the accuracy/specifications between a 4700 to 4705 to a 4707/4708. Same for the 4800 to 4805 to
4808. What was any criteria or test protocols on the boards?
- If the 4708 firmware was transplanted into a 4700 or 4705 does it "improve" the performance of the recipient 4700/4705? (same question for the 480X series)
- What was the highest release/ revisions of firmware for the DMMs and calibrators? Documentation of what the firmware releases fixed? Any "repository" of the firmware releases
available?
- What is the compatibility of the 4000/4000A, 4200, 470X boards if they are used in different models (ie a 4200 or a 4700 Sine board into a 4708) and cross use of a 470X board
into a 480X unit? Also the reverse, a 480X board being used in a 470X unit
- What is the compatibility of the boards (excluding the firmware) of the 12X1 and 49X0 units between each other?
- Is there a listing and any documentation of the various special options? ie I have seen 4700s with a S175 option.
- Any commonality between the 4920, 4920AVMS and 4920M?
- Service commands for 9000, 9100 and 9500 calibrators for dumping/saving calibration NVRAM and restoring it via GPIB
- Data structure and location of the cal values in the NVRAM for the 9000, 9100 and 9500 documentation?
- Is the NVRAM cal data format and location the same/static across the firmware revisions? (So if one upgrades the firmware on a unit does it invalidate the cal constants or are
they still valid?)
- Hidden or undocumented service commands for the 9000, 9100 and 9500 equipment
- Is there any special servicing software for any of the above equipment?
- Service manuals/schematics/documentation for the 9000, 9100 and 9500 including the options.
- Are there programming documentation/files to create or recreate any of the FPGAs, PALs or GALs in the equipment?
- Any service/voltage/waveform notes for troubleshooting the above equipment?
- Any documentation on the serial communication structure/protocols used on the 9000/9100/9500 for the displays and also the serial communication to the various boards?
- Service bulletins for any of the above equipment, including any component changes or equipment enhancements
- Was there differentiation in selection of components/boards to increase the accuracy/specifications between a 9000 and 9100?
- What was the highest release/ revisions of firmware for the 9000, 9100 and 9500 calibrators? Documentation of what the firmware releases fixed? Any "repository" of the
firmware releases available?
- What is the compatibility of the 9000 and 9100 boards if they are used in a "opposite" model? ie: a 9000 board into a 9100 and vice versa.
- Are there any commonality of the boards between the 9000 to 9100 to 9500?
- Any service documentation/schematics for the 49XX and 700X voltage standards?
What was on the drawing board for the next iteration of DMMs and calibrators?
Was any of the upcoming designs transposed into Fluke products after the sale of Wavetek to Fluke?
The Fluke 8508A bears a huge resemblance to the 1271/1281? How much of it is 12X1?
How was the conditioning/burn in done on the DMM and calibrator boards. How were the 1N429 and LTZ1000 voltage references burned in? What was the "pass" criteria?
All or most of these questions would also be applicable to the 106X/107X/108X DMMs also.