Keithley 2450 Reference Manual page 9

Table of Contents
Source current ........................................................................................................................... 4-1
Source voltage .......................................................................................................................... 4-3
Operating boundaries........................................................................................................... 4-4
Current source operating boundaries ........................................................................................ 4-5
Voltage limit boundary examples .............................................................................................. 4-6
Current limit boundary examples ............................................................................................... 4-7
Using NPLCs to adjust speed and accuracy ....................................................................... 4-8
Noise shield ........................................................................................................................ 4-10
Safety shield ....................................................................................................................... 4-10
Safety shielding ....................................................................................................................... 4-11
Grounding .......................................................................................................................... 4-11
Noise and chassis ground ....................................................................................................... 4-11
Floating the Model 2450..................................................................................................... 4-12
Guarding ............................................................................................................................ 4-14
Using guard with a test fixture ................................................................................................. 4-14
Guard circuit drawing .............................................................................................................. 4-15
Using the Model 2450 in a custom test fixture or system .................................................. 4-15
Connecting the Model 2450 output to a custom test fixture .................................................... 4-16
Sink operation .................................................................................................................... 4-17
Battery charge and discharge ............................................................................................ 4-17
Timing information .............................................................................................................. 4-18
Measurement settling time considerations .............................................................................. 4-18
Overtemperature protection .................................................................................................... 4-19
Calculating accuracy .......................................................................................................... 4-19
Calculating source accuracy ................................................................................................... 4-19
Calculating measurement accuracy ........................................................................................ 4-20
Offset-compensated ohm calculations ............................................................................... 4-20
Power calculations ............................................................................................................. 4-21
High capacitance operation ............................................................................................... 4-21
Enabling the high capacitance feature .................................................................................... 4-21
Charging the capacitor and making readings .......................................................................... 4-22
Filtering measurement data ............................................................................................... 4-22
Repeating average filter .......................................................................................................... 4-22
Moving average filter ............................................................................................................... 4-22
Setting up the averaging filter.................................................................................................. 4-23
Reset default values ........................................................................................................... 4-24
Default values ......................................................................................................................... 4-24
Introduction to SCPI commands .............................................................................. 5-1
Introduction to SCPI ............................................................................................................. 5-1
Command execution rules......................................................................................................... 5-1
Command messages ................................................................................................................ 5-1
SCPI command programming notes .................................................................................... 5-2
SCPI command formatting ........................................................................................................ 5-2
Using the SCPI command reference ......................................................................................... 5-4
Model 2450 Interactive SourceMeter® Instrument Reference Manual