Simpson 260 Series - Overload Circuit Test Procedure; Printed Circuit Board Design; Phenolic Case Construction

Introduction
connector that is polarized. Always observe correct polarity when
replacing the 1.5-volt D cell.
The 9-volt battery must be installed ahd tested before
the Instrument is ready for use. Perform the overload
test described in Paragraph 1.4 to ensure proper over-
load circuit operation prior to using the Instrument.
1.4
OVERLOAD
CIRCUIT
TEST:
a.
Set the
range
switch
to
R
X
10,000
POSITION
and
the
func-
tion
switch
to
—DC
POSITION.
b.
Plug
the
black
test
lead
into
the
-COMMON
jack
terminal
and
touch
the
other
end
of
the
test
lead
to
the
+1
volt
input
terminal.
(The
relay
reset
button
should
rise,
indicating
that
the
overload
circuit
is
in
working
condition.)
NOTE:
No
damage
will
occur
to
the
260-7P
as
a
result
of
this
test.
1,5 PRINTED CIRCUIT
1.5.1 Most of the component parts are mounted on a printed
circuit board which simplifies assembly and maintenance, thus,
extending the useful life of the Instrument.
16 PHENOLIC CASE:
e The phenolic case is designed with heavy reinforced walls for
maximum durability and provides excellent protection for
the circuit components.