Keithley 6485 User Manual

2 Connections
Connection fundamentals .......................................................................... 2-2
Model 6485 connections ...................................................................... 2-2
Model 6487 connections ...................................................................... 2-3
Basic connections to DUT .......................................................................... 2-5
Model 6485 DUT connections ............................................................. 2-5
Model 6487 DUT connections ............................................................. 2-6
Input voltage overload (OVRVOLT message) ............................................ 2-9
Using a test fixture ..................................................................................... 2-9
General purpose test fixture .............................................................. 2-10
Model 8009 resistivity test fixture ...................................................... 2-11
Model 6487 interlock ................................................................................ 2-12
Interlock connections ......
................................................................... 2-12
Interlock operation ............................................................................. 2-12
How is the interlock different between a Model 487
and Model 6487? ............................................................................... 2-
13
Analog output ........................................................................................... 2-14
Measurement considerations ................................................................... 2-15
3 Measurements and Sourcing Voltage
Measurement overview .............................................................................. 3-2
Current measurements ........................................................................ 3-2
Model 6487 voltage source .................................................................. 3-2
Performance considerations ...................................................................... 3-3
Warm-up period ................................................................................... 3-3
Voltage offset correction ...................................................................... 3-3
Autozero .............................................................................................. 3-3
Zero check and zero correct ................................................................ 3-3
Current measurements .............................................................................. 3-5
Precautions .......................................................................................... 3-5
Procedure ............................................................................................ 3-6
SCPI programming — current measurements ..................................... 3-8
Programming example — current measurements ............................... 3-9
Model 6487 ohms measurements .............................................................. 3-9
Overview .............................................................................................. 3-9
DC and alternating voltage ohms ........................................................ 3-9
Procedure ............................................................................................ 3-9
SCPI programming — ohms measurements ..................................... 3-11
Programming example — ohms measurement
s ............................... 3-12

Keithley 6485 Specifications

General

Model	Keithley 6485
Category	Picoammeter
Input Impedance	>10^14 Ohms
Voltage Burden	<200µV
Accuracy	0.4% of reading
Voltage Source Range	Not Applicable
Voltage Source Resolution	Not Applicable
Voltage Source Accuracy	Not Applicable
Interface	IEEE-488
Power Requirements	100V to 240V AC, 50/60Hz
Dimensions	89 mm high x 214 mm wide x 369 mm deep (3.5 in x 8.4 in x 14.5 in)