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R E A D I N G T H E M E T E R S C A L E S (See F i g . 3 )
(1)
V O L T A G E
S C A L E S
These scales consist of a 0—10 and 0 ~ 3 scale
which are used to read ranges which are
of
10 and 3 respectively.
refers to the meter fullscale deflection.
are designed to overlap to allow values on the
lower portion of one range to be more accurately
read on the upper portion of the next
sensitive range.
(2)
dBm
S C A L E S
A
level of
1 mW
as OdBm (0.775V) and readings are made in OdBm
w i t h respect to this standard reference level.
F i g .
multiples
The range setting a l w a y s
The ranges
more
into a 600O resistance is take
3
6.
PRECAUTIONS
1.
T o assure accurate measurements allow a f i v e
minute w a r m i n g
measurements are begin.
between 1V and 300mV and between 1mV
300M/ and 10/A/ upon powering
result in the deflection
2.
T o preserve the high s e n s i t i v i t y of this unit, be
sure to use either the input signal cable
or another
low capacitance shielded cable.
single conductors or other
impedance signal sources can result in noise being
introduced
into the measurement
3.
Be sure to take care not to exceed the
allowable input levels :
10/A/—300/A/ ranges: A C : 10Vrms
1 m V ~ 3 0 0 m V ranges: A C : 8 0 V r m s
.
1V—300V ranges :
For
excessively high inputs
ranges the input impedance drops to
10012.
- 1 1 -
up period before actual
Note t h a t
switching
the unit up may
of the
meter.
unshielded cables or high
circuit.
m a x i m u m
D C : 500V
5 0 0 V ( D C + A C p e a k )
5 0 0 V ( D C + A C p e a k )
in the 10/A/ to 300/A/
approximately
arid
provided
Use of
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