SECTION
1
GENERAL INFORMATION
1.1
INTRODUCTION
The Model 197 is a six function,
5?h
digit resolution
autoranging digital multimeter with a
+-220,000
count LCD
(Liquid Crystal Display). This
A/D
range is greater than the
normal +-199,999 count
A/D
used in many
5?h
digit DMMs.
The
5%
digit resolution allows the Model 197 to measure
DC
voltage from 1pV/count to
1OOOV.
AC
voltage and current
measurements are standard in the Model 197. TRMS ACV
capability ranges from IpVlcount to
750V.
The Model 197
measures resistance from 1mQ to 220MQ on seven resistance
ranges. The Model 197 has six current ranges that measure
current from 1nA (lO-9A) to 10A.
The dB function makes
it
possible to compress a large range
of readings into a much smaller scope. The Model 197 dBm
measurements are referenced to the standard
600Q
impedance
but can be modified with the use of relative
(REL)
feature.
The Model 197 has two IEEE-488 interface options: The
Model 1972 and the Model 1973. These optional interfaces
enhance the capabilties of the Model 197 by allowing pro-
grammed control over the IEEE-488 bus. The Model 1972 also
includes an analog output. The bus commands are the same
for each interface and respond to IEEE-488 protocol.
6.
5%
Digit Resolution-The Model 197 has a +220,000
count A/D that surpasses the more common k199,999
count A/D.
7.
Four
Terminal Ohms-These terminals are used to
eliminate the voltage drop across the current carrying
leads.
8.
Sensitivity-The Model 197 has 1pV, ImQ and 1nA sen-
sitivity. The IpV of sensitivity allows minute levels of off-
set, temperature etc. A 1nA sensitivity allows low current
measurements without special equipment. Measure
leakage, bias and offset current. A ImQ sensitivity allows
easy low resistance measurements.
1.3
WARRANTY INFORMATION
Warranty information may be found on the inside front cover
of this manual. Should
it
become necesary to exercise the
warranty, contact your Keithley representative
or
the factory
to determine the proper course of action. Keithley In-
struments maintains service facilities in the United States,
United Kingdom and throughout Europe. Information con-
cerning the application, operation
or
service of your instru-
ment may be directed to the applications engineer at any of
these locations. Check the inside front cover for addresses.
1.4
MANUAL ADDENDA
1.2
FEATURES
The Model 197 includes the following features:
1.
2.
3.
4.
5.
Six Measurement Functions-DCV, ACV, DCA, ACA,
OHMS
and dB all built in.
(REL) Relative Mode-The relative mode allows offsets to
be nulled out (e.g. test lead resistance for low resistance
measurements) and selects a variety of reference im-
pedances for dB measurements.
Digital Calibration-A non-volatile
RAM
stores calibra-
tion constants and can be performed from the front panel
or
over the IEEE-488 bus.
Data Logger-A data storage buffer is included to allow
up to
100
readings and minimum/maximum readings be
internally stored at a user selectable rate. The buffer may
be read and controlled from the front panel
or
over the
IEEE-488 bus. In the talk-only mode, the output rate can
also be programmed.
Autoranging-The Model 197 includes a fast autoranging
feature for easier measurements.
Information concerning improvements or changes to this in-
strument which occur after the printing
of
this manual will be
found on an addendum sheet included with this manual. Be
sure to review these changes before attempting to operate
or
service the instrument.
1.5
SAFETY SYMBOLS AND TERMS
The following safety symbols and terms are used in this
manual or found on the Model 197.
The symbol
A
on the instrument denotes the user should
refer to the operating instructions in this manual.
The symbol &n the instrument denotes that a potential
of
1OOOV
or
more may be present on the terminal(s). Stand-
ard safety practices should be observed when such dangerous
levels are encountered.
1-1
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