Keithley 2001 Operator's Manual page 325

Bit B10  Not used.
Bit B11, Buffer Pretriggered (BPT)  Set bit indicates that the trace buffer pretrigger event has oc-
curred (PTR), or the operations associated with the pretrigger have been completed (NTR).
Bits B12 through B15  Not used.
Questionable Event Register:
Bits B0 through B3  Not used.
Bit B4, Temperature Summary (Temp)  Set bit indicates that an invalid reference junction measure-
ment has occurred for thermocouple temperature measurements (PTR), or a subsequent valid reference
junction measurement has occurred (NTR).
Bits B5, B6 and B7  Not used.
Bit B8, Calibration Summary (Cal)  Set bit indicates that an invalid calibration constant was detected
during the power-up sequence (PTR). The instrument will instead use a default calibration constant. This
error will clear after successful calibration of the instrument.
Bits B9 through B13  Not used.
Bit B14, Command Warning (Warn)  Set bit indicates that a Signal Oriented Measurement Com-
mand parameter has been ignored (PTR), or a subsequent Signal Oriented Measurement Command has
executed successfully (NTR).
Note: Whenever a questionable event occurs, the ERR annunciator will turn on. The annunciator will turn
off when the questionable event clears.
2001-900-01 Rev. K / August 2010
Bit Position B15 - B12
Event
Decimal Weighting
Value
Value : 1 = Measurement Event Set
0 = Measurement Event Cleared
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Measurement Event Register
B11 B10 B9 B8 B7 B6
BPT BFL BHF BAV
2048
512 256 128
(2 ) 11 (2 ) 9 (2 ) 8 (2 ) 7
0/1 0/1 0/1 0/1
Events : BPT = Buffer Pretriggered
IEEE-488 Reference
B5 B4 B3 B2 B1 B0
RAV HL2 LL2 HL1 LL1 ROF
32 2
16 8 4 1
(2 ) 5 (2 ) 4 (2 ) 3 (2 ) 2 (2 ) 1 (2 ) 0
0/1 0/1 0/1 0/1 0/1 0/1
BFL = Buffer Full
BHF = Buffer Half Full
BAV = Buffer Available
RAV = Reading Available
HL2 = High Limit 2
LL2 = Low Limit 2
HL1 = High Limit 1
LL1 = Low Limit 1
ROF = Reading Overflow
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