LINK Systems System 1100 Tonnage Monitor - Manual (Page 83)

CALIBRATION
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6-11
number of each channel will then appear in each tonnage
display.
For a two channel System 1100 unit, adjust the GAIN ADJUST
potentiometer for CHANNEL 1 (left strain gauge) until the
number 400 appears on the channel 1 tonnage display. Adjust
the GAIN ADJUST potentiometer for CHANNEL 2 (right strain
gauge) until the number 400 appears on the channel 2 tonnage
display.
For a four channel System 1100 unit, adjust the GAIN ADJUST
potentiometer for CHANNEL 1 until the number 400 appears on
the channel 1 tonnage display. Repeat this procedure for
CHANNEL 2, CHANNEL 3, and CHANNEL 4 until the number 400
appears in each channel tonnage display.
9) Press the EXIT key to end CAL-CHECK mode. Select the STATIC-
CAL option in the Config menu. Press the YES key when
prompted with "BEGIN STATIC-CAL (YES/NO)?".
For a four channel System 1100 unit, adjust ZERO ADJUST
potentiometer until the number that appears in the channel 1
tonnage display reads between ±1% of rated tonnage of the
machine to be calibrated. Repeat the zero adjustment
procedure using the ZERO ADJUST for the respective channels
until all channels are zeroed within ±1% of rated machine
tonnage.
Do NOT exit the STATIC-CAL mode.
10) Use the hydraulic jack(s) equipped with suitable pressure
gauge(s) to exert the tonnage at which the machine is to be
calibrated, preferably rated tonnage of the machine but a
tonnage of at least 50% of rated machine tonnage.
When more than one jack is used for calibration, each jack
pressure should be adjusted to exert equal forces (±1%) on the
ram or slide of the machine.
11) For a two channel System 1100 unit, rotate the GAIN ADJUST for
CHANNEL 1 until the number appearing on the channel 1 tonnage
display reads within ±1% of one-half (1/2) of the sum of the
tonnages exerted by the jack(s).