Keithley 6487 Reference Manual

Model 6487 Reference Manual Measurements and Sourcing Voltage 3-31
Programming example — A-V ohms measurements
The following command sequence will perform A-V ohms measurements with a 5V high
value, 10s per phase, and 5 A-V cycles:
*RST ' Return 6487 to GPIB defaults.
TRAC:CLE ' Clear buffer of all readings.
RANG 20e-3 ' Select 20mA range (turn off auto).
OHMS:AVOL:VOLT 5 ' Set high voltage to 5V.
OHMS:AVOL:ONES OFF ' Disable one-shot mode.
OHMS:AVOL:CLE:AUTO ON ' Enable buffer auto clear.
OHMS:AVOL:TIME 10 ' Set time per phase to 10s. (A)
OHMS:AVOL:CYCL 5 ' Set number of A-V cycles to 5. (B)
OHMS:AVOL:UNIT OHMS ' Select ohms units.
SYST:ZCH OFF ' Disable zero check.
OHMS:AVOL:ARM ' Arm A-V ohms, turn on source.
INIT ' Trigger A-V readings.
' Wait for time [(A) × 2] × cycles (B)
' before requesting readings. 100s in
' this example.
TRAC:DATA? ' Request data from A-V ohms buffer.

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%