Keithley 6487 Reference Manual

Model 6487 Reference Manual Status Structure 10-11
Figure 10-4
Standard event status
• Bit B6, user request (URQ) — Set bit indicates that the LOCAL key on the
Model 6487 front panel was pressed.
• Bit B7, power ON (PON) — Set bit indicates that Model 6487 has been turned off
and turned back on since the last time this register has been read.
PON
(B7)
CME
(B5)
EXE
(B4)
DDE
(B3)
QYE
(B2)
(B1)
OR
Standard Event
Register
Standard Event
Enable Register
PON = Power On
URQ = User Request
CME = Command Error
EXE = Execution Error
DDE = Device-Dependent Error
QYE = Query Error
OPC = Operation Complete
& = Logical AND
OR = Logical OR
&
&
&
&
&
OPC
(B0)
&
128
(2
7
)
32
(2
5
)
16
(2
4
)
8
(2
3
)
4
(2
2
)
1
(2
0
)
Decimal
Weights
URQ
(B6)
(B15 - B8)
PON
(B7)
CME
(B5)
EXE
(B4)
DDE
(B3)
QYE
(B2)
(B1)
OPC
(B0)
URQ
(B6)
(B15 - B8)
*ESR?
*ESE <NRf>
*ESE?
64
(2
6
)
To ESB bit
of Status Byte
Register
&

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%