Keithley 6487 User Manual

Model 6485 and 6487 User’s Manual Getting Started 1-15
7 Display annunciators
* (asterisk) Readings being stored in buffer.
(more) Indicates additional selections are available.
AUTO Autorange enabled.
BUFFER Recalling readings
stored in buffer.
ERR Questionable reading or invalid cal step.
FAST Fast (0.1 PLC) reading rate selected.
FILT MEDIAN and/or AVERAGE filter enab
led (also DAMPING enabled).
LSTN Instrument addressed to listen over GPIB.
MATH mX+b, m/X+b, or log10 calculation enabled.
MED Medium (1 PLC) reading rate selected.
REL Relative enabled for present measurement function.
REM Instrument in GPIB remote mode.
SLOW Slow reading rate selected; 6
PLC for 60Hz or 5 PLC for 50Hz.
SRQ Service request over GPIB.
STAT Displaying buffer statistics.
TALK Instrument addressed to talk over GPIB bus.
TIMER Timer controlled triggering in use.
TRIG External triggering (GPIB
or trigger link) selected.
MON Zero correct enabled.
SCAN Voltage sweep armed and ready to run.
OCOMP Voltage source in compliance.

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%