Simpson 260 - Page 9

PHYSICAL DESCRIPTION. EXTERIOR
The instrument consists of a molded black
front panel on which all components are mounted,
and a sturdy molded black phenolic case with re-
inforced walls for maximum durability. The panel
assembly can be removed from the case in one
piece.
The upper portion of the front panel is
taken up entirely with the meter. The lower port-
ion carries the lead connecting jacks, the funct-
ion and range switches, and the ohms adjust con-
trol. All switch positions and jacks are labelled
with molded-in white-filled lettering for long
term readability.
RANGE SWITCH: In the center of the lower front
panel, this has twelve positions. It can be
rotated through 360° in either direction to the
desired range setting.
FUNCTION SWITCH: On the left of the lower front
panel, this has three positions, AC, +DC, -DC.
For D.C. or resistance measurements +DC is norm-
ally selected. On all but the 5CJA/250MV and
lCA ranges, the test lead connections can be re-
versed without removing them from the circuit
under test by switching to -DC.
ZERO OHMS CONTRCL: On the right of the lower front
panel, this is a variable resistance in the ohmmeter
circuit which corrects for variations in the in-
ternal batteries. It is used to adjust the meter
indication to "zero ohms" at the right hand end of
the scale before resistance readings are made.