Sect.
11
Page 4
EXAMPLES:
Range
Meter
Meter
Actual
Switch
Scale
Indicates
Level
VOLTAGE MEASUREME NT
300
3
1. 8
180
10
1
0.44
4.4
. 003
3
2. 3
. 0023
. 001
1
. 27
. 00027
DB
MEASUREMENT
+40 db
db
+2 db
+42 db
+40 db
db
-7 db
+33 db
+10 db
db
-6 db
+ 4 db
-30 db
db
o
db
-30 db
-30 db
db
-8 db
-38 db
•
-50 db
db
-9 db
-59 db
-60 db
db
+1 db
-59 db
•
NOTE:
In case where a meter scale reading
below - 8 db is obtained, it is best
to switch to the next lower range on the instru-
ment so a reading will be obtained
in
the upper
portion of the scale where
highest accuracy
may be obtained.
The same situation exists for voltage measurements.
When a reading is obtained in the lower 1/3 scale, the
range switch should be switched to the next lower
range to obtain a reading in the upper 2/3 scale.
c. Amplifier -
The instrument may be used to amplify small
signals. With full-scale meter deflection, the
amplifier open-circuit output is approximately
. 15 volt rms on all ranges. The response of the
amplifier is flat across the band from 1 0 cycles to
4 mc. The impedance, looking into the OUTPUT
terminals, is approximately 50 ohms over the entire
frequency range. To obtain maximum gain, proceed
as follows:
1) Turn the toggle switch to ON, and allow a warm
up period
of
approximately five minutes .
2) Set the
DB
VOLTS (range) switch at the . 001-
volt position.
3) Connect to the OUTPUT binding posts the equip
ment which is to receive the amplified signal. When
the impedance
of
the load across the amplifier output
is approximately 50 ohms, the output voltage will
be approximately half the open-circuit voltage, or
approximately . 075 volt.
4) Connect the voltage to be amplified to the
INPUT
binding posts. Up to . 002 volt may be applied to
the amplifier with the range switch at the . 001-
volt position.
NOTE
A mplification also may be obtained on the . 003,
. 01, . 03, and . 1 volt ranges, but maximum gain
is available only on the .001 volt range because
of the 10 db loss per step inserted by the
DB
VOLTS
switch as' the switch is tUl'ned in a clockwise
direction.
