Table of Contents
Advertisement
SECTION 1
GENERAL INFORMATION
1.1 INTRODUCTION
This instruction
manual contains the necessary information
for operating and maintaining
the Model 485 Autoranging
Picoammeter
and the Model
1758 Rechargeable
Battery
Pack. The information
is divided into the following
sections:
1. Section
1 contains
general information
and provides
guidelines for using this manual. Important safety infor-
mation is also presented here.
2. Section 2 contains detailed operation information
for the
Model 485.
3. Section 3 contains the information
needed to verify the
accuracy of the Model 485. Performance verification
can
be done upon receipt of the unit or whenever the basic ac-
curacy is in question.
4. For the more technically
oriented, information
on theory
of operation,
maintenance
and servicing is contained
in
Section 4 through 6.
NOTE
The Model 4853 IEEE-488 interface comes sup-
plied with its own instruction
manual.
1.2 GElTlNG
STARTED
Perform the following
steps in sequence to acquaint yourself
quickly and safely with the basic operation of the Model 485.
1.
2.
3.
4.
Verify that the Model 485 was not damaged in transit, as
explained in paragraph 1.3.
Carefully read the safety precautions and warnings found
preceding this section and the first two sections (General
Information
and Bench Operation) of this manual.
Referring to paragraph 2.2.1 (Line Power) set the line
voltage switch and plug the power cord into a properly
grounded cutlet.
If the optional battery pack is installed
the charge circuitry will be activated.
Acquaint
yourself with the controls and display of the
Model 485 as follows:
A. Turn on the Model 485 by pressing in the ON/OFF
pushbutton.
All the zeroes will be displayed briefly.
B. Select autoranging
by pressing in the AUTO pushbut-
ton. The nA and AUTO annunciators
will be displayed.
Pressing any of the other range pushbuttons
will put
the Model 485 in manual ranging as indicated by the
absence of the AUTO annunicator.
C. Engage the ZERO CHECK pushbutton
and note that
the ZERO CHECK annunciator
turns on. Release the
ZERO CHECK button.
D. Select LOG by pressing the LOG pushbutton.
The
LOG annunciator
will turn on. Press the LOG button
again to take the Model 485 cut of the LOG measure-
ment mode.
E. REL (relative) can be used in the linear measurement
mode or the logarithm
measurement
mode. The
stored REL level will be subtracted from all subsequent
measurements.
Press the REL pushbutton
and note
that the REL annunciator
turns on.
F. To
activate
the
100 point
DATA
STORE
with
MinIMax,
press end hold in the STO/CLR
pushbut-
ton. When the reading rate r = 0 is displayed let go of
the button. The ST0 annunciator
will turn on. Press
the RCL pushbutton
and the last data point will be
displayed briefly followed by the reading (data). Other
date points can be displayed by holding in the RCL
button.
Turn off the DATA STORE by pressing the
STO/CLR pushbutton
again.
5. When you are comfortable with the controls of the Model
485, go on and make the desired measurements using
Section 2, Bench Operation as a guide.
1.3 INSPECTION
The Model 485 Bench Picoammeter was carefully inspected,
both mechanically
and electrically,
before shipment.
Upon
receiving the Model 485, check for any obvious signs of
physical damage that might have occurred during shipment.
Report the damage to the shipping agent immediately. Retain
the original packing materials in case reshipment becomes
necessary. The following
items are included with every Model
485 order:
l
Model 485 Autoranging
Picoammeter
l
Model 485 Instruction
Manual
l
Additional
accessories as ordered.
If an additional
instruction
manual is required,
order then
manual package (Keithley
Part Number 486-901-00).
The
manual package includes an instruction
manual and all perti-
nent addenda.
1.4 SPECIFICATIONS
Detailed Model 485 specifications
may be found immediately
preceding the table of contents of this manual.
1.5 WARRANTY
INFORMATION
Warranty information
may be found on the inside back cover
of this manual. Should it be necessary to exercise the warran-
ty, contact
your Keithley representative
or the factory
to
determine the correct course of action. Keithley Instruments
maintains service facilities in the United States, West Ger-
many, Great Britain, France, the Netherlands,
Switzerland
1-l
Advertisement
Table of Contents
