Keithley 6487 Reference Manual

A Specifications
B Status and Error Messages
Eliminating common SCPI errors ............................................. B-7
-113, "Undefined header" .................................................. B-7
-410, "Query INTERRUPTED" ......................................... B-7
- 420, "Query UNTERMINATED" .................................... B-8
C DDC Emulation Commands
DDC language ........................................................................... C-2
Sweeps or A-V ohms in DDC mode ................................ C-10
Status words ..................................................................... C-11
Status byte format ............................................................ C-12
D IEEE-488 Bus Overview
Introduction ............................................................................... D-2
Bus description .......................................................................... D-3
Bus lines .................................................................................... D-4
Data lines ........................................................................... D-5
Bus management lines ....................................................... D-5
Handshake lines ................................................................. D-5
Bus commands .......................................................................... D-6
Uniline commands ............................................................. D-9
Universal multiline commands .......................................... D-9
Addressed multiline commands ....................................... D-10
Address commands .......................................................... D-10
Unaddress commands ...................................................... D-10
Common commands ........................................................ D-11
SCPI commands ............................................................... D-11
Command codes ............................................................... D-11
Typical command sequences ............................................ D-12
IEEE command groups .................................................... D-13
Interface function codes .......................................................... D-14
E IEEE-488 and SCPI
Conformance Information
Introduction ................................................................................ E-2
GPIB 488.1 Protocol .................................................................. E-3
Selecting the 488.1 protocol ....................................................... E-4
Protocol differences ................................................................... E-5
Message exchange protocol (MEP) .................................... E-5
Using SCPI-based programs ............................................... E-5
NRFD hold-off .................................................................... E-6

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%