Keithley 2001 User Manual

IEEE-488 Reference
4-17
Questionable Condition Register  This is a real-time 16-
bit read-only register that constantly updates to reflect the
current operating conditions of the Model 2001. For exam-
ple, when a calibration summary event occurs, bit B8 (Cal)
will set. When the event is no longer true, bit B8 will clear.
The following SCPI query command can be used to read the
Questionable Condition Register:
:STATus:QUEStionable:CONDition?
The Questionable Condition Register and the Transition Fil-
ter are used to set the bits of the Questionable Event Register.
The Transition Filter is discussed next.
Questionable Transition Filter  The transition filter is
made up of two 16-bit registers that are programmed by the
user. It is used to specify which transition (0 to 1, or 1 to 0)
in the Questionable Condition Register will set the corre-
sponding bit in the Questionable Event Register.
The filter can be programmed for positive transitions (PTR),
negative transitions (NTR) or both. When an event bit is pro-
grammed for a positive transition, the event bit in the Ques-
F
igure 4-12
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
&
&
&
0
(B13 - B9)(B14) (B8)(B15)
0
Cal
(B13 - B9)(B14) (B8)(B15)
0
Warn Cal
PTR
NTR
Questionable
Transition Filter
Questionable Event
Register
(B13 - B9)(B14) (B8)(B15)
To Questionable
Summary Bit
(QSB) of Status
Byte Register.
(B7 - B5)
(B7 - B5)
(B7 - B5)
(B7 - B5)
Warn Cal
0
Warn Cal
&
(B4)
Temp
(B4)
Temp
(B4)
Temp
(B3 - B0)
(B3 - B0)
(B3 - B0)
(B3 - B0)(B4)
Temp
&
& = Logical AND
OR = Logical OR
PTR = Positive Transition Register
NTR = Negative Transition Register
tionable Event Register will set when the corresponding bit
in the Questionable Condition Register changes from 0 to 1.
Conversely, when programmed for a negative transition, the
bit in the status register will set when the corresponding bit
in the condition register changes from 1 to 0.
The individual bits of the transition filter registers can be set
or cleared by using the following SCPI commands:
:STATus:QUEStionable:PTR <NRf>
:STATus:QUEStionable:NTR <NRf>
The transition filter registers can be read at any time by using
the following SCPI query commands:
:STATus:QUEStionable:PTR?
:STATus:QUEStionable:NTR?
Reading a transition filter register using the above query
commands does not affect the contents of the register.
The following operations will set (1) all the bits of the PTR
register and clear (0) all the bits of the NTR register:
1. Cycling power.

Keithley 2001 Specifications

General

Brand	Keithley
Model	2001
Category	Multimeter
Language	English