Keithley 6487 Reference Manual

10-12 Status Structure Model 6487 Reference Manual
Operation event status
The used bits of the operation event register (Figure 10-5) are described as follows:
• Bit B0, calibrating (CAL) — Set bit indicates that the Model 6487 is calibrating.
• Bit B1, A-V Ohms — Set bit indicates that alternating voltage ohms is running.
• Bit B3, Sweeping — Set bit indicates that a voltage sweep is running.
• Bit B5, waiting for trigger event (Trig) — Set bit indicates that the Model 6487 is
in the trigger layer waiting for a TLINK trigger event to occur.
• Bit B6, waiting for arm event (Arm) — Set bit indicates that the Model 6487 is in
the arm layer waiting for an arm event to occur.
• Bit B10, idle state (Idle) — Set bit indicates the Model 6487 is in the idle state.
Figure 10-5
Operation event status
OR
Operation Event
Enable Register
Idle = In Idle
Trig = Waiting for trigger event
Arm = Waiting for arm event
Cal = Calibrating
A-V = A-V Ohms
Swp = Sweep running
& = Logical AND
OR = Logical OR
&
&
&
Cal
(B0)
&
1024
(2
10
)
32
(2
5
)
Decimal
Weights
Cal
(B0)
[:EVENt]?
64
(2
6
)
Cal
(B0)
Trig
(B5)
Arm
(B6)
Idle
(B10) (B9-B7)
(B15-B11)
:CONDition?
Trig
(B5)
Arm
(B6)
Idle
(B10) (B9-B7)
(B15-B11)
Operation Condition
Register
Operation Event
Register
Trig
(B5)
Arm
(B6)
Idle
(B10) (B9-B7)
(B15-B11)
1
(2
0
)
:ENABle <NRf>
:ENABle?
To OPC bit
of Status Byte
Register
(B4)
Swp
(B3)
A-V
(B1)
(B2)
(B4)
Swp
(B3)
A-V
(B1)
(B2)
(B4)
Swp
(B3)
A-V
(B1)
(B2)
16
(2
4
)
8
(2
3
)
4
(2
2
)
2
(2
1
)

Keithley 6487 Specifications

General

Type	Picoammeter/Voltage Source
Current Measurement Range	20 fA to 20 mA
Interfaces	GPIB, RS-232
Voltage Burden	< 200 µV
Input Impedance	>10^14 Ω
Power	100 V / 120 V / 220 V / 240 V
Basic Current Measurement Accuracy	0.4%