(4) T o f i x the range, set the M O D E selector s w i t c h ©
to H O L D position. The range immediately before
setting the selector s w i t c h is held hereafter.
[ H o w to Use Hold Mode]
(1) Press the O N / O F F s w i t c h CD to f i x indication of
the R A N G E lamps © to 300V.
(2) Supply signal to the I N P U T c o n n e c t o r ® .
(3) W h i l e observing the swing of the meter pointer,
select a desired range w i t h the D O W N s w i t c h ® .
(4) The selected range is changed into the 1 level
higher range by pressing the U P s w i t c h © or the
1 level lower range by pressing the D O W N s w i t c h ® .
[Scale (See F i g .
5)]
(1) Voltage Scale
The meter has double-graduated black scales: the
scale © graduated f r o m 0 to 10 and the scale ®
graduated f r o m 0 to 3. In the 1V range, division
10 on the 0—10 scale @ indicates 1V. In the
300mV range, division 3 on the 0 ~ 3 scale ®
indicates 300mV. Scales correspond to voltages
likewise in other rancje.
(2) dB Scale
The dB scale, marked w i t h d B V in g e n e r a l ,
indicates 1V as OdB. The 0—10 scale © has
voItage-ratio-based d i v i s i o n s and division 10 on it
corresponds to OdB .
If the meter reads - 6 d B in measurement using the
20dB ( 1 0 V ) range, the measured value is 2 0 d B - 6 d B
= 14dB. T h i s correspondence also applies to other
ranges.
(3) dBm Scale
In general, voltmeters have a reference level division
of OdBm equal to 0.775V (1 mV power) induced across
a 6 0 0 0 resistance load. Therefore, the red dBm scale
is a v a i l a b l e to measure a power level referenced to 0
d B m , w i t h the impedance of the given power circuit
being 6 0 0 O pure resistance. Where measured across
specific resistance loads, f o r example, 10 k l l , other
than the 6 0 0 O load, the levels are sometimes
expressed in d B s .
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