Keithley 6430 User Manual

E IEEE-488 and SCPI Conformance Information
Introduction ............................................................................... E-2
F Measurement Considerations
Floating measurement safety concerns ...................................... F-2
Low current measurements ........................................................ F-3
Leakage currents and guarding .......................................... F-3
Noise and source impedance .............................................. F-5
Generated currents .............................................................. F-6
Voltage burden .................................................................... F-9
Overload protection .......................................................... F-10
High impedance voltage measurements .................................. F-10
Loading effects ................................................................. F-10
Cable leakage resistance ................................................... F-11
Input capacitance (settling time) ...................................... F-11
High resistance measurements ................................................ F-13
Ohms measurement methods ........................................... F-13
Characteristics of high-valued resistors ........................... F-13
General measurement considerations ...................................... F-14
Ground loops .................................................................... F-14
Light ................................................................................. F-15
Electrostatic interference .................................................. F-15
Magnetic fields ................................................................. F-15
Electromagnetic Interference (EMI) ................................ F-16
G GPIB 488.1 Protocol
Introduction ............................................................................... G-2
Selecting the 488.1 protocol ...................................................... G-2
Protocol differences ................................................................... G-3
Message exchange protocol (MEP) .................................... G-3
Using SCPI-based programs .............................................. G-3
NRFD hold-off ................................................................... G-4
NDAC hold-off ................................................................... G-4
Trigger-on-talk ................................................................... G-5
Message available ............................................................... G-5
General operation notes ...................................................... G-5
GPIB reading speed comparisons .............................................. G-6
Sweep operation ................................................................. G-6
Single-shot operation .......................................................... G-7

Keithley 6430 Specifications

General

Type	Sub-Femtoamp Remote SourceMeter
Compliance Voltage	200 V
Maximum Output Voltage	200 V
Maximum Output Current	100 mA
Compliance Limit	Programmable
Interface	GPIB, RS-232
Input Impedance	>10^14 Ω