SECTION
2
BENCH OPERATION
2.1
INTRODUCTION
2. Attach the test leads to the circuit under test. Use ap-
3.
Set the
DMM
to the proper function and range.
propriate safety rated test leads for this application.
~~
This section contains the information needed to prepare and 4. Energize the circuit using the installed connect-disconnect
operate the Model 197 as a bench
DMM.
Bench operation
device and make measurements without disconnecting the
consists of using the Model 197 to perform basic voltage, cur- DMM
.
rent, resistance and
dB
measurements. Also, the operation of 5. ~~-~~~~~i~~
the
circuit
using the installed connect-
the data logger is covered. The capabilities of the Model 197
disconnect
device.
can be enhanced with the addition of the Model 1973 or
Model 1972 IEEE-488 interface.
IEEE
operation is covered in
the Model 1973 Instruction Manual. The optional battery
pack (Model 1978) is also covered in this section.
6,
Disconnect the
test
leads
from
the
circuit
under
test,
2.3
PREPARATION FOR USE
2.3.1
Line
Power
2.2
HIGH ENERGY CIRCUIT SAFETY
PRECAUTIONS
The Model 197 has a three-wire line cord which mates with
AC
line
power
as
follows:
To
Optimize safety
when
measuring
in
high energy third-wire grounded
Connect
the
instrument
to
distribution circuits, read and use the directions in the follow-
ing warning.
WARNING
Dangerous arcs
of
an explosive nature in a
high energy circuit can cause severe per-
1.
Set the LINE VOLTAGE switch on the back of the instru-
ment to correspond to line voltage available. Ranges are
105V-125V or 210v-250V 50/60Hz
AC.
CAUTION
Connect only to the line voltage selected.
Application
of
incorrect voltage can
damage the instrument.
sonal injury or death.
If
the meter is con-
nected to a high energy circuit when set to
a current range, low resistance range or any
other low impedance range, the circuit is
virtuallv shorted. Dangerous arcing can
result even when the meter is set
to
voltage
range
if
the minimum voltage spacing is
reduced.
2. Plug the power cord into a properly grounded outlet.
When making measurements in high energy circuits use test
leads that meet the following requirements:
Test leads should be fully insulated.
Only use test leads that can be connected to the circuit (e.g.
alligator clips, spade lugs, etc.) for hands-off measurements.
Do not use test leads that decrease voltage spacing. This
diminishes arc protection and creates a hazardous condi-
tion.
Use the following sequence when testing power circuits:
1.
De-energize the circuit using the regular installed connect-
disconnect device such as the circuit breaker, main switch,
etc.
WARNING
Ground the instrument through a properly
grounded receptacle before operation.
Failure to ground the instrument can result
in severe injury or death in event of a short
circuit or malfunction.
NOTE
Although the Model 197 is specified at 50 and
60Hz the instrument may be operated
at
400Hz
and 440Hz.
2-1
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