Name of Control
Function
Ref. Desig.
or Indicator
Index
Used to select the calibration, the velocity, or
Rotary Switch S4
OPERATION Selector
4
Switch
the displacement measuring function of the
vibration meter. Provides two ranges of sen-
sitivity for each measurement function. The
meter indication must be multiplied by the
setting of both the RANGE and OPERATION
selector switches.
RANGE Switch
This switch is a seven-position attenuator. The
Rotary Switch S2
5
setting of this switch indicates the full-scale
meter reading. The meter indication must be
multiplied by the setting of both the RANGE
and OPERATION selector switches.
OFF Power Switch
6
Two-position toggle switch used to turn the
Toggle Switch S5
input ac power on or off.
Dual Variable
SENSITIVITY 4 Control
7
Used to adjust the sensitivity (gain) of the ad-
Resistors R15A, R15B
justable gain amplifier for channel 4 operation.
Both variable resistors are mounted on the
same shaft and are connected to the amplifier
when the CHANNEL selector switch is set to
position 4.
SENSITIVITY 3 Control
8
Used to adjust the sensitivity (gain) of the ad-
Dual Variable
Resistors R14A, R14B
justable gain amplifier for channel 3 operation.
Both variable resistors are mounted on the
same shaft and are connected to the amplifier
when the CHANNEL selector switch is set to
position 3.
SENSITIVITY 2 Control
Dual Variable
9
Used to adjust the sensitivity (gain) of the ad-
Resistors R13A, R13B
justable gain amplifier for channel 2 operation.
Both variable resistors are mounted on the
same shaft and are connected to the amplifier
when the CHANNEL selector switch is set to
position 2.
11
Used to adjust the sensitivity (gain) of the ad-
Dual Variable
SENSITIVITY 1 Control
Resistors R11A, R1lB
justable gain amplifier for channel 1 operation.
Both variable resistors are mounted on the
same shaft and are connected to the amplifler
when the CHANNEL selector switch is set to
position 1.
12
CALIBRATE SIGNAL
Variable Resistor with
Used to calibrate the instrument. When the
Control
2-Position Switch
CALIBRATE SIGNAL switch is depressed
R35, S6
(and the OPERATION switch is set to position
C), a portion of the ac filament supply voltage
is supplied to the fixed gain amplifier. When
not depressed, voltage is supplied to the
adjustable gain amplifier. The level of this
voltage is adjusted by variable resistor R35.
Functions of Operating Controls and Indicators (Sheet 1 of 2)
