ACM Series Instrument www.tensitron.com pg. 11
Recalibrating
Tensitron provides prompt turnaround service for its instruments needing
repair and/or re-certification. All values tested are traceable to national
standards, and serviced instruments meet or exceed all civilian and military
specifications. A calibration certification listing all calibration data and
values is included with each instrument.
If you would like to calibrate your instrument yourself, follow the procedure below.
*IMPORTANT: This procedure should only be performed by a qualified
calibration facility using certified and traceable dead weights.
Do not use this procedure for a simple accuracy check.
1. Prepare blank charts: Photocopy the blank calibration chart to use for the
new values you will be collecting. (See Appendix 2 for blank calibration charts
that are correctly sized to fit on the back of your instrument.)
2. Adjust zero: If the pointer is not resting at the 0 position on the dial, unscrew
the socket plug located on the bottom left of the instrument body. Using a
small screwdriver, gently adjust the zero adjust screw until the pointer
indicates 0. After adjustment apply torque-seal or paint to lock the screw
head.
3. Perform a Dead Weight Calibration:
a. For each cable to be tested:
i. Set the correct riser for the cable diameter as described in
“Selecting the Riser” above.
ii. Simulate a tension load on the cable with a dead weight by
following the procedure in step #1 under “Checking
Accuracy” above.
iii. On the calibration chart, in the column for that cable, record
the pointer reading so it lines up with the corresponding
weight in the CABLE TENSION LBS column.
iv. Repeat this process with different weights.
b. Do not attempt to measure cable diameters larger than those for
which the meter was designed. See Appendix 1, Riser Usage Charts,
for the appropriate cables for each instrument.
c. If a tension value for a particular cable is considered “critical”, remove
the cable from the aircraft and perform this dead weight calibration
procedure on that cable, rather than relying on a comparable sample.
d. Repeat this process for each cable.
4. Complete Chart: Make sure to sign and date your new calibration chart, and
attach it to the back of the instrument.
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