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2401 Stanwell Drive • Concord, California 94520 • Ph: 925/687-4411 or 800/542-3355 • Fax: 925/687-3333 • www.calex.com • Email: sales@calex.com
24/2001
Model 463 Bridgesensor
Specifications
NOTE: Unless otherwise noted, specifications apply after 1 hour warm up at
25°C ambient. Temperature coefficients apply between 0°C and 55°C ambient.
Getting Started with the Model 463
1. Excitation Supply. If remote sensing is not used, connect
+Sense to +Excitation, terminal 3 to 4, and connect
-Sense to -Excitation, terminal 1 to 2. These connections
must be made to adjust the supply as in step 2.
2. Apply power to the Model 463 and adjust the Excitation
supply. Turn SWB-1 “ON” for a fixed 10 Volts. This will set
the supply to 10.2 ±2.5% and provide the best temperature
stability. For voltages between 5 and 10 Volts, place
SWB-1 in the “OFF” position and set the Excitation
Supply with potentiometer E. SWB-2 may be in either
position.
3. Turn the power to the Model 463 “OFF” and connect the
load cell to the Model 463 Excitation terminals and the
Amplifier Inputs.
4. Turn on power to the 463.
5. Turn SWA-3 “ON”. (To set output ZERO)
6. Select the expected full scale signal range according to
the table with SWA-4 and SWA-5. If the output from the
load cell is not known, set both SW-4 and SW-5 “ON” for
the 40-50mV range.
7. Select required ZERO output range. SWA-2 “ON” for
zero Volts or SWA-2 “OFF” for +2 Volts.
8. Adjust D potentiometer for 0 or +2 Volts.
9. Turn SWA-3 “OFF”. Expect output to change.
10. Apply no load or dead weight to load cell.
11. Adjust TARE potentiometers A and B for the same ZERO
output set in Step 8. SWA-1 “OFF” provides a bridge
output balance of -3mV to +15mV, and “ON” between
+15mV and +25mV, referred to the amplifier input. This
adjustment does not change the output of the bridge.
12. Apply full scale load and adjust SPAN (GAIN)
potentiometer C for the desired full scale output. Set
Range switches SWA-4 and SWA-5 as required.
13. Remove full scale load and check ZERO output. Adjust
FINE TARE potentiometer A if required.
14. Recheck full scale as in Step 12.
15. End.
Note:
If the amplifier is used without using the 463 Excitation
Supply, the external power supply low side must be
connected to the -EXCITATION pin 2 on the Model
463, or one of the inputs must be tied to pin 2,
-EXCITATION. This provides a DC return path for
the finite amplifier input current.
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