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SECTION 1
GENERAL
INFORMATION
1.1 INTRODUCTION
The Keithley Model 193A System DMM,
with the TRMS
AC Volt and Current options installed, is a six function auto-
ranging digital multimeter.
At 6% digit resolution,
the LED
display can display
~2,200,OOO counts. The range of this
analog-to-digital
(A/D) converter is greater than the nor-
mal *1,999,999 count AID converter used in many 6% digit
DMMs. The built-in
IEEE-488 interface makes the instru-
ment fully programmable
over the IEEE-488 bus. With the
TRMS ACV option and the Current option installed,
the
Model 193A can make the following
basic measurements:
1. DC voltage measurements
from 1OOnV to lOOOV.
2. Resistance measurements
from 1OOpfl to ZOOMR.
3. RTD temperature
measurements
from -1OOOC to 63O'C.
4. TRMS AC voltage measurements
from I$/
to 700V.
5. DC current measurements
from 1nA to 2A.
6. TRMS AC current measurements
from 1nA to 2A.
In addition
to the above mentioned
measurement
capa-
bilities, the Model 193A can make dB and TRMS AC + DC
measurements.
1.2 FEATURES
Some important
Model 193A features include:
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14 Character Alphanumeric
Display-Easy
to read 14 seg-
ment LEDs used for readings and front panel messages.
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High
Speed Measurement
Rate-1000
readings
per
second.
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Zero-Used
to cancel offsets or establish baselines. A zero
value can be
rogrammed
from the front panel or over
the IEEE-488 & us.
l
Filter-The
weighted
average digital filter can be set for
1 to 99 readings from the front panel or over the bus.
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Data Store-An
internal buffer that can store up to 500
readings is accessible from either the front panel or over
the bus.
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Digital
Calibration-The
instrument
may be digitally
calibrated from either the front panel or over the bus.
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User Programmable Default Conditions-Any
instrument
measurement
configuration
can be established
as
the power-up
default conditions.
l
Translator Software-User
defined words can be used to
replace standard command strings over the IEEE488 bus.
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Thermocouple
(TC) temperature
measurements
con be
made over the IEEE-488 bus.
1.3 WARRANTY
INFORMATION
Warranty information
may be found on the inside front
cover of this manual. Should it become necessary to exer-
cise the warranty,
contact your Keithley representative
or
the factory
to determine
the pmper
course of action.
Keithley
Instruments
maintains
service facilities
in the
United States, United Kingdom
and throughout
Europe.
Information
concerning
the application,
operation or ser.
vice of your instrument
may be directed to the applications
engineer at any of these locations. Check the inside front
cover for addresses.
1.4 MANUAL
ADDENDA
Information
concerning
improvements
or changes to the
instrument
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 attemp-
ting 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 193A.
The A
symbol on the instrument
denotes that the user
should refer to the operating
instructions
in this manual.
The M
on the Instrument
denotes that a potential
of
1OOW or more may be present on the terminal(s).
Stand-
ard safety practices
should
be observed
when
such
dangerous
levels are encountered.
The WARNING used in this manual explains dangers that
could result in personal injury
or death.
The CAUTION used in this manual explains haz.ards that
could damage the instrument.
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