Cleveland Motion Controls ULTRA ISC CANTILEVER TRANSDUCER CLTSCM REV AA - Manual (Page 32)

U LTRA S ERIES ISC C ANTILEVER T RANSDUCER T ECHNICAL M ANUAL MAN-70445-0 R EV AA
4.9 A DJUSTMENT T OOLS (O NLY I F N OT U SING N UMERICAL C ORRECTION )
Using the correct tools simplifies the setup process and necessary adjustments. Keep the following points in
mind:
 The Integrated Signal Conditioning Amplifier utilizes two different potentiometers. The Gain and
Zero adjustments are located on the side of the amplifier (under the sticker). The adjustment tool
should have dimension on the order of 0.5mm (.020 inches) blade thickness and be 2.5 mm wide
(0.1inches).
 Important: Use a non-conductive tool to alter potentiometer positions. Be sure that adjustment
tool does not touch any part of PCB circuit to avoid accidentally damaging it.
4.10 G AIN A ND F INE Z ERO C ALIBRATION
The gain and zero adjustments are preset but accessible by the user for adjustment if absolutely
necessary. To make your final calibration adjustments, use the following steps:
1. Verify Zero on the analog Outputs for the “unloaded” (no web force applied) condition and adjust
the Zero potentiometer to correct for any minor offset voltage.
2. Apply the calibration force to the transducer(s) and adjust the Gain potentiometer to achieve the
desired span.
3. Verify linear operation of the transducer and amplifier by applying a series of forces that falls
somewhere between the zero and full-scale endpoints. The intent is not to re-execute any
calibration per se, but to confirm the hardware’s ability to accurately report a measured force
without non-linearity.
We recommend that you focus only on achieving a particular voltage “span” between the load and
unloaded forces by alternating between the two force levels. Avoid repeatedly adjust the Zero
potentiometer between measurements unless the offset voltage becomes excessive and interferes with
achieving a valid output signal on the analog output. You should only adjust the final Zero after the desired
Gain setting has been achieved.
These final calibration steps represent the minimal adjustments that might be required at periodic
calibration intervals and
typically involve only the Zero and Gain potentiometers accessible through the
small holes in the front cover.
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