Keithley 6485 User Manual

2-4 Measurement Concepts Model 6485 Picoammeter Instruction Manual
Figure 2-1
BNC Input connector
Maximum input levels
The maximum input levels to Model 6485 are summarized in Figure 2-2.
WARNING The maximum safe voltage between picoammeter LO and chassis
ground (common mode voltage) is 42V. The Model 6485 does not inter-
nally limit the LO-to-chassis voltage. Exceeding 42V can create a
shock hazard.
CAUTION The LO-to-chassis breakdown voltage is 500V. Exceeding this voltage
may cause damage to the instrument.
Connecting COMMON or ANALOG OUTPUT to earth while floating
the input may damage the instrument.
NOTE Analog outputs will be at same voltages as applied to the BNC shell.
INPUT
CAT I
Shield
(LO or GND)
220V PK
ANALOG OUT
Input
(Center Conductor)

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)