Humboldt HM-1327 Humboldt Marshall/TSR Loader - Manual (Page 21)

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Press (SELECT INPUT) to scroll through and choose the channel you
wish to calibrate. Once you have chosen the desired channel you wish to
calibrate press
(CLEAR CALIBRATION).
WARNING: IF YOU CLEAR A CALIBRATION IT IS LOST FOREVER!
After the calibration has been cleared, Press
(CALIBRATE CHANNEL)
You should see this screen:
Press (SET GAIN). With the instrument you wish to calibrate
mounted to a calibration frame attached to the HM-1327, record the sensor
min value with no load on the instrument (X divisions).
Next, apply the full engineering load value to instrument on the calibration
frame and again, record the sensor min reading (X divisions). Subtract the
two values. This value should be a number larger than the sensor maximum
rating.
If not, you need to increase the gain to compensate for the difference. Press
(SET GAIN) and repeat until the difference between the two values is
more than the maximum sensor rating.
EXAMPLE:
If you are calibrating a 10,000 lb. load cell, you need a difference value of
at least 10,000 divisions. If you register a min value reading of 450 divisions
with no load on the sensor and your min is 8450 divisions at full load on
the instrument, your difference value will be 8000 divisions. (8450 – 450 =
8000). To increase the gain press
(SET GAIN) until you have more
than 10,000 divisions.
Once the gain has been set, the zero point needs to be set. To set the zero
point, apply the 0% force to the sensor and press
(SET SENSOR MIN).
Now apply the 100% force to the sensor and press (SET SENSOR
MAX).
To return to any prior screen you can always press
On the next page is an Instrumentation calibration chart listing max
divisions, as well as typical gain factors needed in calibrating each
instrument type.
INPUT CALIBRATION
* SET GAIN
1
* SET SENSOR MIN 123
* SET SENSOR MAX 12345