Any time it is in DC current with it zeroed, it will be in 2000 count mode. Holding down the ZERO button will turn this feature off and the meter will revert to 6000 count. I am not thinking this is a real 2000 count. Once you zero it out, it seems the offset is added with the overflow. So for example with the 2A range selected and the meter zeroed, I may read 2.4nn A and -2.5xx before it rolls. It appears like the range is +/-2.5 offset with the zeroed value.
0x10 - 0x70
0x11 - 0x17
So 0x1770 or 6000 decimal
Below is the entire EPROM contents for mine in raw format:
FFFFFFFFFF0080E803E803FA0000BE03
70179808BE003D3D3C3CFFFF0AFF40FF
879806816400960000801780FB7E3875
4E0209EE030913010B7A120A92040A00
00010001000798006400640064000000
FE7A1C77008000800000000001000000
E37F487E0100AD2A0000000000000000
617F0080A97FE07CE605000000000000
0000000000000017000000191E1B0407
000000000000001600000018001A0509
0000000000000000000000000000000A
0000000000000000000000000000000B
0D0002300D0003202000032020000310
4100030841000305410003050D000230
008000800080008000802D02BE033005
2F02C1033F0500805AC7EF0F0F800000
There appears to be a small catch the the 6000 count mode. If you are using the DC current mode and zero out the offset, the range appears to revert to 2000 counts. A quick glance over Kerry's translated data sheet, I do not see a way around this.
Does it revert back to 2k temporary and power cycle gets you back to 6k?
I wonder whats at 10h, 11h. Maybe it uses that when you zero out?