Keithley 6485 User Manual

6-8 Buffer Model 6485 Picoammeter Instruction Manual
Programming example
The following program fragment stores 20 readings into the buffer and then calculates the
mean average on the buffer readings:
' Select data elements:
*RST ' Return 6485 to RST defaults.
FORM:ELEM READ,TIME ' Select reading and timestamp.
' Store and Recall Readings:
TRIG:COUN 20 ' Set trigger model to take to 20
readings.
TRAC:POIN 20 ' Set buffer size to 20.
TRAC:FEED SENS ' Store raw input readings.
TRAC:FEED:CONT NEXT ' Start storing readings.
INIT ' Trigger readings
' setup to SRQ on buffer full - see
' Figure G-2 for example
TRAC:DATA? ' Request all stored readings.
' Acquire Mean Statistic for Buffer Readings:
CALC3:FORM MEAN ' Select mean statistic.
CALC3:DATA? ' Request mean statistic.

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)