INDUSTRIAL MONITORING INSTRUMENTATION DIVISION
PAGE 4
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A section view of the shaker’s vibration head is shown in Figure 2. The shaker consists of an electromagnetic
exciter, driven by an oscillator at a frequency of 159.2 Hz (1000 rads
-1
). A small ICP® accelerometer provides a
servo feedback to maintain a constant vibration level of 1 g. This enables accelerometers with masses up to 250
grams to be adjusted without their mass influencing the reference level.
Use of the shaker is straight-forward. The accelerometer is attached to the shaker using the supplied ¼-28 stud.
Alternatively, the shaker is supplied with adapter mounting studs for 10-32 and M6 x 1.0 mounting threads. Note:
When the sensor mass is lighter than 75 grams, screw in adapter mass between the sensor and the shaker head.
The unit will not operate if mass of sensor system is less than 75 grams.
Connect the accelerometer to the vibration level indicating instrument and activate the shaker by pushing the
On/Off button on the side of the shaker. See Figure 1.
The indicating instrument may now be adjusted to read the relevant reference value. Following the system
adjustment, the shaker is switched off by pressing the On/Off button a second time. To prolong the useful life of
the batteries, Model 699B02 automatically switches off after 90 seconds. With new batteries, 80 sensitivity
checks with maximum load are possible. To change between auto shutoff and continuous run, depress the
corresponding side of the rocker switch in the options cavity of the shaker. For example, to choose auto shutoff,
depress the left side of the rocker switch as per Figure 1.
Figure 2: Cross-Section of Handheld Shaker Vibration Head
When the On/Off button is pushed for the first time, Model 699B02 handheld shaker is activated. Power is
ramped up to the actuator to provide a smooth, gradual turn-on. This action prevents shock-induced overloads to
the test sensor. A special sensor within the unit constantly measures the g level and adjusts to maintain 1 g. The
frequency is 159.2 Hz. Since a relatively stiff suspension is used, any sensor up to 250 grams can be verified
without affecting accuracy. Model 699B02 is powered by four (4) “AA” batteries in a pack. The pack model
number is 073A15. Alkaline batteries are recommended for a longer service life. Since Model 699B02 is a
