OHAUS Valor 1000W, Руководство по обслуживанию

Страница: 11 / 44

CHAPTER 1 GETTING STARTED
Valor
™ 1000W Series Service Manual
1-5 Ohaus Corporation www.ohaus.com
circuit is protected from all outside influences such as moisture, physical damage, or electrical
interference.
Figure 1-2. Strain Gauge Load Cell.
The strain gauges are wired into a Wheatstone Bridge Circuit. (See Figure 1-3.)
Figure 1-3. Downward force on the Platform bends the beam, causing two gauges to stretch
and two to compress in opposition, changing the electrical resistance of the circuit.
At zero load, all strain gauges are unstressed. Weight placed on the Platform bends the
beam, causing two gauges to stretch and two to compress in opposition, changing the
electrical resistance of the circuit.
1.7 HOW LOAD CELLS OPERATE continued
The difference in the output signal before and after the mass was placed on the platform is
taken, interpreted and displayed.
Force
Strain Gauges
Holes drilled in Strain
Gauge Load Cell
Printed Circuit Board
completing Wheatstone
Bridge circuit
Beam
Attachment points to
Platform
Wheatstone Bridge Circuit
Strain Gauge
+
+
Strain Gauge
–
Strain Gauge
Strain Gauge
–