INDUSTRIAL MONITORING INSTRUMENTATION DIVISION
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precision instrument and is used to check the sensitivity of sensors, it should be verified prior to use with a
reference standard. The unit has several unique features of interest:
Continuous Use Option Switch:
In this mode, once the shaker is turned on, it does not shut off until the
On/Off button is depressed a second time. The default position of this switch is Auto; the unit turns off
automatically after a preset time.
Peak/RMS Selection:
If a 100 mV/g sensor is on the shaker table, and the unit is in peak mode, then the
output is 100 mV/g. If the switch is set to RMS, then the output is 141 mV. See Figure 3.
External Power Supply:
An optional DC power supply (Model 073A16) is available for power Model
699B02 handheld shaker. It operates off 85-245 VAC, 47-63 Hz input. When this power supply is
plugged into the shaker, the internal batteries are automatically disconnected.
Figure 3: Peak vs RMS Selection with 100 mV/g Accelerometer
Calibration Check Points:
Calibration of the internal feedback circuit can be verified via test points
(located in the options cavity). See Figure 1. The measured value in volts AC should agree with the
calibration certificate. This is useful for quick field check of unit integrity, such as that which might be
needed if the shaker is dropped and a reference standard is not immediately available. This test is not a
guarantee of shaker function. If the data does not agree with expected values, the shaker should be
checked with a calibration standard before continued use.
Low Power Indicator:
A low power indicator light is located above the On/Off switch. See Figure 1. This
light glows when the available power is marginally adequate to drive the shaker (with the mass on the
shaker). This indicator does not signify erroneous data. If Model 699B02 cannot obtain 1 g at 159.2 Hz,
then the unit shuts off. The low power indicator signifies an imminent inability to drive the mass on the
shaker because the test sensor is too heavy, the batteries are low on power or the external power supply
is inadequate.
