Keithley 6487 Reference Manual

Model 6487 Reference Manual Status Structure 10-3
Figure 10-1
Model 6487 status mode structure
0
2
3
5
6
Cal
10
11
12
13
15
Condition
Register
(Always Zero)
0
2
3
5
6
10
11
12
13
15
Event
Register
0
11 1
2
3
5
6
10
11
12
13
15
Event Enable
Register
&
&
&
&
&
&
&
&
&
&
&
&
&
&
&
&
Logical
OR
Swp
Trig
7
Idle
11
12
13
Condition
Register
7
Idle
11
12
13
Event
Register
7
Idle
11
12
13
Register
&
&
&
&
&
&
&
&
&
&
&
&
&
&
Logical
OR
Idle
EAV
QSB
MAV
ESB
RQS/MSS
OSB
Status
Byte
Register
1
EAV
QSB
MAV
ESB
6
OSB
Service
Request
Enable
Register
&
&
&
&
&
&
&
Logical
OR
*STB?
*SRE
*SRE?
Master Summary Status (MSS)
MSB = Measurement Summary Bit
EAV = Error Available
QSB = Questionable Summary Bit
MAV = Message Available
ESB = Event Summary Bit
RQS/MSS = Request for Service/Master Summary
Status
OSB = Operation Summary Bit
Error Queue
Output Queue
Trig Trig
Note : RQS bit is in serial poll byte,
MSS bit is in *STB? response.
1
14 14
OPC
QYE
DDE
EXE
CME
URQ
PON
8
9
10
11
12
13
15
Event
Register
8
9
10
11
12
13
15
Register
&
&
&
&
&
&
&
&
&
&
&
&
&
&
&
&
Logical
OR
(Always Zero)
Operation Complete
Query Error
Device Specific Error
Execution Error
Command Error
User Request
Power On
OPC
QYE
DDE
EXE
CME
URQ
PON
*ESR? *ESE <NRf>
*ESE?
MSB MSB
12
13
12
13
Event
Register
12
13
Register
&
&
&
&
&
&
&
&
&
&
&
&
&
Logical
OR
Condition
Register
11
Calibration Summary
Warn
222
4
IOV
Cal
A-V
Cal Cal
INT INT INT
Trigger Layer
Command Warning
999
15 15 15
&
&
14 14 14
&
15 15 15&
Calibrating
8
9
Cal
Warn
4
8
9
Cal
Warn
4
8
9
:CONDition? [:EVENt]? :ENABle <NRf>
:ENABle?
Low Limit 1 Fail
High Limit 1 Fail
Low Limit 2 Fail
High Limit 2 Fail
Limits Pass
Reading Available
Reading Overflow
Buffer Available
Buffer Full
LL1F
HL1F
LL2F
HL2F
LP
RAV
ROF
BAV
(Always Zero)
BFL
:CONDition? [:EVENt]? :ENABle <NRf>
:ENABle?
LL1F
HL1F
LL2F
HL2F
LP
RAV
ROF
BAV
BFL
LL1F
HL1F
LL2F
HL2F
LP
RAV
ROF
BAV
BFL
4
Arm Layer Arm
8
4
Arm
8
4
Arm
8
Questionable Event Registers
Event Enable
Standard Event Registers
Event Enable
Measurement Event Registers
Event Enable
Operation Event Registers
:CONDition? [:EVENt]? :ENABle <NRf>
:ENABle?
0
00
Input Overvoltage
IOV IOV
VSC
VSC VSC
Interlock Asserted
Voltage Source Compliance
A-V Ohms
A-V A-V
Sweeping
Swp Swp

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%