4. C O N T R O L S AND INDICATORS
F R O N T P A N E L
© P O W E R (ON
j>l / O F F
* ) S w i t c h
A C power s w i t c h .
® Power L a m p
Indicates the V T - 1 7 2 is powered up. L i g h t s when
P O W E R is depressed.
(D
R A N G E Selector S w i t c h
A t t e n u a t o r selector s w i t c h . 16 positions in 10dB
steps. T o prevent excessive i n p u t s , t h i s s w i t c h is
s t a r t e d in the highest, 300V range and g r a d u a l l y
worked down range to provide an easily readable
meter deflection.
® I N P U T J u c k
B N C signal input connector.
© R E L A T I V E R E F Control and © U N C A L L a m p
S e n s i t i v i t y adjustment and uncalibrated annunciator.
More than 10dB of adjustment is possible. When
the control is turned f u l l y clockwise, the set range
is c a l i b r a t e d . T h i s control can be used to adjust
the meter to an appropriate level f o r relative
measurements. - When not set a t f u l l y clockwise the
U N C A L lamp lights to w a r n the operator.
F i g .
1
Front panel view
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