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Model 485
Autoranging Picoammeter
Instruction Manual
Contains Operating and Servicing Information
WARRANTY
Keithley Instruments, Inc. warrants this product to be free from defects in material and workmanship for a period of 1 year from date of
shipment.
Keithley Instruments, Inc. warrants the following items for 90 days from the date of shipment: probes, cables, rechargeable batteries,
diskettes, and documentation.
During the warranty period, we will, at our option, either repair or replace any product that proves to be defective.
To exercise this warranty, write or call your local Keithley representative, or contact Keithley headquarters in Cleveland, Ohio. You will
be given prompt assistance and return instructions. Send the product, transportation prepaid, to the indicated service facility. Repairs
will be made and the product returned, transportation prepaid. Repaired or replaced products are warranted for the balance of the origi-
nal warranty period, or at least 90 days.
LIMITATION OF WARRAN-IY
This warranty does not apply to defects resulting from product modification without Keithley's express written consent, or misuse of
any product or pwt. This warranty also does not apply to fuses, software, non-rechargeable batteries, damage from battery leakage, or
problems arising from normal wear or failure to follow instructions.
THIS WARRANTY IS IN LlBU OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING ANY IMPLIED
WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. THE REMEDIES PROVIDED HEREIN ARE
BUYER'S SOLE AND EXCLUSIVE REMEDIES.
NEITHER KBITHLEY INSTRUMENTS, INC. NOR ANY OF ITS EMPLOYEES SHALL BE LIABLE FOR ANY DIRECT, INDI-
RECT, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF ITS INSTRUMENTS AND
SOFTWARE EVEN IF KEITHLEY INSTRUMENTS, INC., HAS BEEN ADVISED IN ADVANCE OF THE POSSIBILITY OF
SUCH DAMAGES. SUCH EXCLUDED DAMAGES SHALL INCLUDE, BUT ARE NOT LIMITED TO: COSTS OF REMOVAL
AND INSTALLATION, LOSSES SUSTAINED AS THE RESULT OF INJURY TO ANY PERSON, OR DAMAGE TO PROPERTY
Keithley Instruments, Inc. - 28775 Aurora Road *Cleveland, OH 44139~216-248-0400 -Fax: 216-248-6168 * http://www.keithley.com
Model 485 Autoranging Picoammeter
Instruction Manual
0 1984, Keithley Instruments, Inc.
Test Instrumentation Group
All rights reserved.
Cleveland, Ohio, U.S.A.
January 1990, Sixth Printing
Document Number: 485-901-01 Rev. F
SPECIFICATIONS
NORMAL MODE
ACCURACY I1 YEAR, ANALOG REJECTION MAXIMUM
lW28~C RISE TIME RATIO CONTINUOUS
RANGE RESOLUTION * l%rdg + countslt I10 .SO%, IS0 or EOHz, INPUTt
2nA O.lpA 0.4 + 4 60ms 7OdB 350"dC
20 "A 1 PA 0.4 + 1 60iTlS 7OdB 350Vdc
200 "A 10 pA 0.2 + 1 6rnS 65dB 350Vdc
2 PA 100 PA 0.15 + 1 3ms 6FdB 350Vdc
20 !A 1 nA 0.1 + 1 3ms 65dB 5O"dc
200 ,`A 10 "A 0.1 +1 lms 65dB 5OVdc
2mA 100 "A 0.1 +1 lms 55dB 5OVdc
GENERAL
,NP"T VOLTAGE BURDEN: Less than 200&V.
RANQING: Manual or autoranging.
AUTORANGING TIME: Average 250ms per range. DISPLAY: 4% digit LCD, 0.5" height: polarity. range and staf"s indication.
SmLlNG TIME AT DISPLAY: Less than 1 second to within 2 co"nts on
OVERRANGE INDICATION: "OL" displayed.
fixed range.
CONNECTORS:
CONVERSION PERIOD: 300,"s.
Input: ENC.
TEMPERATURE COEFFICIENT 10