Keithley 2700, User Manual, Page: 328 / 500

Model 2700 Multimeter/Switch System User’s Manual Status Structure 11-17
Questionable event register
The used bits of the Questionable Event Register ( Figure 11-7 ) are described as follows:
•
Bits B0 through B3
— Not used.
•
Bit B4, Temperature Summary (Temp)
— Set bit indicates that an invalid refer-
ence junction measurement has occurred for thermocouple temperature
measurements.
•
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. 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 Command parameter has been ignored.
•
Bit B15
— Not used.
NOTE
Whenever a questionable event occurs, the ERR annunciator will turn on. The
annunciator will turn off when the questionable event clears.
Figure 11-7
Questionable event status
(B13 - B9) (B14) (B8) (B15)
OR
Questionable
Condition
Register
Questionable
Event Enable
Register
Warn = Command Warning
Cal = Calibration Summary
Temp = Temperature Summary
& = Logical AND
OR = Logical OR
0
(B13 - B9) (B14)
(B8)
(B15)
0
Warn Cal
Questionable
Event
Register
(B13 - B9) (B14) (B8) (B15)
To
Questionable
Summary Bit of
Status (QSB)
Byte Register
(B7 - B5)
(B7 - B5)
(B7 - B5)
Warn Cal
0
Warn Cal
(B4)
Temp
(B4)
Temp
(B3 - B0)
(B3 - B0)
(B3 - B0) (B4)
Temp
&
&
&
&