Keithley 6482, Reference Manual

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6482-901-01 Rev. A / August 2012 Return to Section Topics 13-15
Model 6482 Dual-Channel Picoammeter / Voltage Source Reference Manual Section 13: Status Structure
Condition registers
As Figure 13-1 shows, each status register set (except the standard event register set) has a
condition register. A condition register is a real-time, read-only register that constantly updates to
reflect the present operating conditions of the instrument. For example, while the Model 6482 is in
the idle state, bit B10 (idle) of the operation condition register will be set. When the instrument is
taken out of the idle state, bit B10 clears.
The commands to read the condition registers are listed in Table 13-5 . For details on reading
registers, see “Reading registers,” page Section 13-5 .
Event registers
As Figure 13-1 shows, each status register set has an event register. When an event occurs, the
appropriate event register bit sets to 1. The bit remains latched to 1 until the register is reset.
Reading an event register clears the bits of that register. *CLS resets all four event registers.
The commands to read the event registers are listed in Table 13-6 . For details on reading
registers, see “Reading registers,” page Section 13-5 .
Event enable registers
As Figure 13-1 shows, each status register set has an enable register. Each event register bit as a
logical AND (&) operation to a corresponding enable bit of an enable register performed on it.
Therefore, when an event bit is set and the corresponding enable bit is set (as programmed by the
user), the output (summary) of the register will set to 1, which in turn sets the summary bit of the
status byte register.
The commands to program and read the event enable registers are listed in Table 13-7 . For details
on programming and reading registers, see “Programming enable registers,” page Section 13-4
and “Reading registers,” page Section 13-5 .
Table 13-5
Condition register commands
Command Description
:STATus:OPERation:CONDition?
:STATus:MEASurement:CONDition?
:STATus:QUEStionable:CONDition?
Read Operation Condition Register.
Read Measurement Condition Register.
Read Questionable Condition Register.
Table 13-6
Event register commands
Command Description
*ESR?
:STATus:OPERation:[:EVENt]?
:STATus:MEASurement:[:EVENt]?
:STATus:QUEStionable:[:EVENt]?
Read Standard Event Status Register.
Read Operation Event Register.
Read Measurement Event Register.
Read Questionable Event Register.
Note: Power-up and *CLS resets all bits of all event registers to 0. STATus:PRESet has no effect.