Triplett 630-APL - Familiarization; Meter Scales; Panel Layout and Controls

4 FAMILIARIZATION
The Model 630-APL Volt-Ohm-Milliammeter is a rugged
long scale multi-range instrument in a compact portable case.
Remove the test leads from the small envelope and notice
the two alligator clips enclosed. The clips slide over the ends
ої the test prods and make very handy connectors.
Plug the small ends of the test leads into the panel jacks
marked СОМ and V-9-A. The jacks and plugs are espe-
cially made for trouble-free, low resistance connections.
Scales
Notice there are five scales on the meter. The top scale
(red) is used when measuring ohms. This scale is marked
from 0 to 1K (at left side). With the switch knob turned to
ОХ І, the ohms scale is read just as it is marked. With the
switch knob turned іо 9X10, the numbers on ohms scale must
ай be multiplied by 10. Likewise ОХІК апа QX100K mean
to multiply by 1000 and 100,000 respectively.
The second scale from the top (black) is used to read
all DC currents and voltages. The third from the top (red) is
used for all AC voltages except the 3 volt range—the latter
is read on the bottom red scale (marked 3 at full scale).
The lowest scale (black) is used for all decibel measure-
ments. Notice the chart near the lower right hand corner of
the dial. This is used in conjunction with the DB scale as
explained on page 14.
Panel
Just below the meter is a small plastic screw. This is
rotated with a small coin or screw driver to adjust the meter
рол to zero. This need Бе adjusted only occasionally
ut for best accuracy the pointer should always be on zero
before making a measurement.
The large knob in the lower center of the panel is used
to select all ranges. The markings are self explanatory.
Left of the knob is a recessed О АП) control used when
making resistance measurements.
To the right of the knob is a recessed switch used for
reversing polarity on DC ranges.
Observe the jacks and note carefully the marking for