Allied Radio Knight KG-640 Посібник оператора - Сторінка 3
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Друкувати сторінкуThe Knight VOM has been designed with the service technician
in mind. It has 57 ranges and incorporates a 414", 50 p»amp,
mirror scale meter movement
that eliminates parallax errors.
Factory selected calibrating resistors compensate for the indi-
vidual characteristics of the meter movement and AC rectifiers.
High quality 1% multiplier resistors assure 3%
accuracy
on
DC and 5% on AC.
DESCRIPTION
OF
CONTROLS
SELECTOR
SWITCH
Selects the function, —AC
volts, DC volts etec.......
; and
the individual ranges within the function.
POLARITY
REVERSE
SWITCH
Allows the reversal of polarity to the meter without having to
change
the connection
of the test leads to the circuit
under
AC
test. It should be set in the +DC when measuring AC voltages.
SCALE
MULTIPLIER
SWITCH
Provides
a range-dividing
function,
effectively
doubling
the
number
of usable
ranges
for voltage
and
current
measure-
VA
ments.
This switch must be set in the 0 <a position when
making
resistance measurements.
OPERATING
NOTES
Before any measurements
are made, be sure the instrument is
placed flat on a bench
where
the measurements
will be per-
formed. Always check that the meter pointer is lined up with
the zeros on the left hand side. If the pointer does not fall in
line with these marks,
turn the nylon
screw
directly
above
the word "OFF" either left or right until the pointer is positioned
correctly.
Although
this meter
is very similar
to many
meters
on the
market today, it is recommended that you read all of the mate-
rial on the following pages. It will be important to you to fully
understand
the capabilities
of the
meter
before
you
begin
using it.
When the meter is used to measure DC voltages, polarity should
be observed. The black test lead is plugged in the -COM jack and
should be connected to the low or common side of the circuit in
which the voltage is to be measured. The red test lead is plugged
into the VOA jack and should be connected to the high side of
the circuit. In some
cases where
the polarity is not known,
touch the red test lead to the circuit to get an indication of.
meter
deflection.
Once
an
indication
has
been
obtained,
the
polarity switch can be set correctly.
When
using the meter be sure to take into consideration
the
loading effects the meter will have on any high impedance cir-
cuit. This is especially true on the low AC and DC ranges.