I don't ever remember seeing an 87-II anywhere, although I guess maybe there was one at one point, at least internally at Fluke?
Reading the service manuals, the first manual version is dated 1989-1996 (covers 1988-presume 1996 models). The second version is dated 1997, and applies to models marked front and back with "CAT III 1000V" on the top and bottom case. I presume this is the unlabelled 87-II CAT III compliant. (The first version is just marked "1000V", and has 600V fuses.)
http://assets.fluke.com/manuals/83_85_87smeng0500.pdfThe 87-II service manual is named "838587_1000_smeng0000.pdf". I presume i got the link from here somewhere but can't find it now.
(Found a source
https://xdevs.com/doc/Fluke/83_1000_smeng0000.pdf )
87-II [vs 87-I] specifications are very similar - difference listed below (the ones I could find):
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VAC accuracy 400V 5kHz-20kHz unspecified [+/-(2% + 20)]
VAC accuracy 1000V 1kHz-5kHz unspecified [+/-(2% + 4)]
ohms accuracy 400ohms +/- (0.2% + 2) ** using REL [+/- (0.2% + 1)]
Capacitance accuracy 5.0 microF +/- 1.9% +3 [+/- (1% +3)]
mA AC and DC 40mA nad 400mA burden voltage typical 1.8mV/mA [1.6mV/mA]
typical ohms short circuit current:
400 ohms 200 microA [700 microA]
4k ohms 80 microA [170 microA]
40k ohms 12 microA [20 microA]
400k ohms 1.4 microA [2 microA]
ohms short circuit current <200 microA [<500 microA]
diode test short circuit current typical 0.6mA [1.0mA]
Fuses:
mA or microA 44/100A 1000V FAST [1A 600V FAST]
A 11A 1000V FAST [15A 600V FAST]
Safety protection class: IEC 1010-1 1000V, CAT III; UL3111; TUV EN61010-1; CSA C22.216 1010.1 [Class II per IEC348, ISA-DS82, UL1244]
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80 Series III service information is dated April 1998-2002. Specifications look the same as presumed series II which only lasted about a year.
It looks like all models can verify against 1k ohm internal resistance (R43 metal film 1k 0.1% resistor- F1 fuse test result: 1000+/-5) by connecting V/ohm/diode input to microA/mA input (upper half). In the 87-I service manual, this is described under "Performance Tests". For the others it is described as a "F1 fuse test". Somewhere I read that the 1k ohm resistor is a high precision resistor, therefore if the number is correct it implies that the voltmeter and constant current generator are working to spec.