CANNON Instrument Company | Troubleshooting
Adjusting Bending Beam Rheometer Force and Deflection Voltages
This section provides notes on adjusting the force and deflection voltages for the TE-BBR Bending Beam
Rheometer.
To complete the force adjustment procedure, the VR5 POT (VR2 POT on the old version) and the VR3
POT must be changed to match the desired voltage.
To complete the deflection adjustment procedure, the VR1 POT (VR4 POT old version) and the VR2 POT
(VR5 POT old version) must be changed to match the desired voltage.
Tools Required: voltmeter, Phillips head screwdriver, small slot screwdriver
Parts Required: 44.6525 Setup Beam, 44.6810 RCA Cable Assembly
Adjust Force Voltages
New Version Rear Panel (Refer to Diagram A, Figure 25)
1. Attach the voltmeter lead to the rear panel FORCE connection (adjacent to the serial port) and
adjust the zero load so that the shaft is essentially weightless (floating).
2. With no beam on the beam supports, and with the contact nut just touching the gage block red
level, adjust the VR5 POT (see diagram, next page) until the voltmeter reads zero volts. Then replace
the ¼”steel beam on the beam supports and remove the gage block.
3. Set the ZERO/LOAD switch to ZERO (if it’s not already); then adjust the air supply so that the shaft is
barely touching the steel beam. Observe and record any small voltage number
4. Place 400 grams on the platform and adjust the VR3 (GAIN) POT on the rear panel control board for
8.00 volts plus the small voltage number observed in the preceding step (the gain will be 50
grams/volt).
Old Version (Refer to Diagram B, Figure 26)
1. Attach the voltmeter lead to the rear panel FORCE connection (adjacent to the serial port) and
adjust the zero load so that the shaft is floating and essentially weightless.
2. With no beam on the beam supports, and with the contact nut just touching the gage block red
level, adjust the VR2 POT (see diagram, next page) until the voltmeter reads zero volts. Then
replace the ¼” steel beam on the beam supports and remove the gage block.
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