Maintenance
3500/42 Operation and Maintenance
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5.2
Adjusting the Scale Factor and the Zero
Position
This section shows how to adjust the transducer scale factor and the transducer
position, or "zero". The Scale Factor Adjustment can be used to accommodate
any deviations in transducer scale factor as measured on the installed
transducers. Do not use the procedure to compensate for any errors within the
monitor and the I/O module. If a monitor does not meet specifications, exchange
it with a spare and return the faulty module to Bently Nevada Corporation for
repair. The newly installed spare module should be properly configured and
tested.
Adjusting the scale factor affects the readings of all configured parameters
associated with the channel. If you change the scale factor, be sure to use the
new value when calculating inputs for verification of channel values.
The Zero Position Adjustment is used for Thrust, Eccentricity, and Differential
Expansion measurements as well as for Gap measurements when Gap is
configured to read in displacement units (not volts). Adjust the zero position after
the probe is gapped and its target is in the proper position.
Both adjustment procedures consist of using the Rack Configuration Software to
upload the configuration from the rack, change the setting for scale factor or zero
position, and then downloading the new configuration back to the rack. You can
adjust these settings using the following two methods:
enter a new value in the scale factor box on the transducer screen or the zero
position box on the Channel Options screen.
use Adjust to get immediate feedback from the channel on the Adjust screen.
The advantage of using the Adjust screen is that you can use the bar graphs to
see the effect of your adjustments on the output signals of the channel. The
following procedures show how to use the methods.
5.2.1
Adjusting the Scale Factor
1. Connect the configuring computer to the rack using one of the methods listed
in the 3500 Monitoring System Rack Configuration and Utilities Guide (part
number 129777-01).
2. Run the Rack Configuration Software.
3. Initiate communication with the rack by clicking on the Connect option in the
File menu and then selecting the connection method that you used in step 1.
4. Upload the configuration from the rack by clicking on the Upload option in the
File menu.
5. Click on the Options button on the 3500 System Configuration screen.
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