CANNON Instrument Company | Troubleshooting
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).Adjusting deflection voltages.
Adjust Deflection Voltages
New Version Rear Panel (Refer to Diagram A, Figure 25)
1. Lift the air bearing shaft and place the calibrated 0.15" beam on the beam supports. Gently lower
the shaft until it contacts the calibrated beam
2. Plug the voltmeter into the Deflection jack on the rear panel. Then adjust the VR1 (ZERO) POT.
Observe the board diagram until the output from the rear panel Deflection jack reads zero.
3. Place the stainless steel standard ¼”beam on the beam supports and ensure that the shaft is making
contact with the beam. Adjust the LVDT VR2 (GAIN) POT. Observe diagram on the rear panel circuit
board until the voltmeter reads -5.00 volts.
4. Replace the ¼” beam with the 0.15" beam on the supports. Then readjust the VR1 POT so that the
voltmeter reads zero volts. Replace the 0.15" beam with the ¼” beam on the supports and readjust
the VR2 (GAIN) POT for -5.0 volts on the voltmeter. Repeat this step until your readings are
consistent. (This will produce a scale of .02 inches/volt).
5. Tighten the contact nut on the load platform. Then place the gage block in position underneath it so
the red level is under the contact nut. Lower the air bearing until it is just touching the 0.25" beam.
Note: It may be necessary to adjust the screw height to permit the air bearing to
contact the beam. See step 6.
6. Loosen the hex nut on the adjustment screw and turn the screw by hand until the contact nut is just
touching the red level of the gage block. Remove the 0.25" beam.
7. Readjust the screw height until the voltmeter reading for the deflection voltage is -5.0 volts; then
lock it in place with the hex nut. If necessary, make final adjustments to the screw height until the
voltmeter reads -5.0 volts.
Old Version Rear Panel (Refer to Figure 26, Diagram B)
1. Lift the air bearing shaft and place the calibrated 0.15" beam on the beam supports. Gently lower the
shaft until it contacts the calibrated beam.
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