OHAUS T71 Use and care manual

Calibration Guide T71 Indicators
Ohaus Corporation www.ohaus.com i T71 Indicators Calibration Guide
T71 Indicators have three calibration processes: Zero, Span, and Linearity Calibration.
Follow the prompts for calibration mass values.
Ensure that the scale is level and stable during the entire calibration process.
Allow Indicator to warm up for five minutes after stabilizing to room temperature.
If the Calibration Menu is locked, the scale may be set in Legal For Trade mode.
To abort calibration, press the Exit button anytime during the calibration process.
Zero Calibration
Zero calibration uses one calibration point. This point is established with no weight on the scale.
Use this calibration method to adjust for a different pre-load without affecting the Span or
Linearity calibration.
Press and hold Menu until C.A.L. appears, then press Yes.
(LFt.NO appears briefly before C.A.L., if the Indicator is not in LFT mode.)
ZErO appears. Press Yes to initiate Zero Calibration.
The display flashes 0 and the calibration unit. Press Yes to establish the
zero point.
The display shows --C-- while the zero point is established.
When zero calibration is completed, the display shows dONE.
Then the scale exits to the active weighing mode and displays the actual
weight value.
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Span Calibration
Span Calibration uses two points to adjust the Indicator. The first point is the zero value, where
there is no weight on the scale. The second point is the Span value, where a calibration mass
is placed on the scale.
Press and hold Menu until MENU appears. Press Yes.
(LFt.NO appears, then C.A.L., if the Indicator is not in LFT mode.)
Press Yes. SPAN appears. Press Yes to initiate Span Calibration.
The display flashes the span calibration point. Place the specified weight
on the scale and press Yes.
(Press No to increment the selections, or Back to decre
ment the selections.
When desired value appears, place specified weight on scale; press Yes.)
The display shows --C-- while the span point is established.
When the span point is established, the display flashes 0.
Remove the weight from the scale; press Yes to establish the zero point.

T71 Indicators Calibration Guide
T71 Indicators Calibration Guide ii Ohaus Corporation www.ohaus.com
Span Calibration continued
The display shows --C-- while the zero point is established.
When span calibration is completed, the display shows dONE.
The scale exits to the active weighing mode and displays the actual weight
value.
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Linearity Calibration
Linearity calibration uses three calibration points: the full calibration point is selectable by the
user. The mid-calibration point is automatically set at half of the full calibration point.
The zero calibration point is established with no weight on the scale.
Press and hold Menu until C.A.L. appears, then press Yes.
(LFt.NO appears briefly before C.A.L., if the Indicators is not in LFT mode.)
ZERO appears. Press No. SPAN appears. Press No. Linearity appears.
Press Yes to initiate Linearity Calibration.
The display flashes the full calibration point and calibration unit.
Place the specified weight on the scale and press Yes.
(Press No to increment the selections, or Back to decrement the selections.
When desired value is displayed, place the specified weight on the scale and
press Yes.)
The display shows --C-- while the full calibration point is established.
When the full calibration point is established, the display flashes the
mid-calibration point. Place the specified weight on the scale and press Yes.
The display shows --C-- while the mid-calibration point is established.
When the mid-calibration point is established, the display flashes 0.
Remove the weight from the scale; press Yes to establish the zero point.
The display shows --C-- while the zero point is established.
When linearity calibration is completed, the display shows dONE.
The scale exits to the active weighing mode and displays the actual weight
value.
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*80253037* P/N 80253037