OHAUS JR 300 Manual De Operación página 3

• Negative Value: When a load is removed from the scale, any zeroed
value will be displayed as a negative number. To return to normal
operation, the zeroed value can be cancelled by pressing On/Off Zero.
• Low Battery Indication: The display will show Lo when the batteries are
weak and need to be replaced.
• Auto Shut-Off: To extend battery life, the scale will automatically turn off
after approximately 4 minutes if no button press or active weighing is
occurring. This feature is only active with battery operation.
Two Button Keypad
• On/Off Zero: Pressing this button turns on the scale. This same button
operates the zero feature when the scale is on. Press and hold this
button for three seconds to turn the scale off.
• Unit/Cal: Press this button briefly to change the weighing unit. The
following weight units may be selected: troy ounces (oz t), pennyweight
(dwt), pound-ounces (lb oz), ounces (oz), or grams (g). Press and hold
this button to begin the calibration process.
Calibration
For best results, calibrate the scale at regular intervals. This is especially
important if the scale is in use for prolonged periods.
• Pressing and holding the Unit/Cal button starts the
calibration process. The display should show CAL.
• The calibration process can be aborted by turning the
scale off.
• Press the On/Off Zero button to capture 0. The
display shows -C- while the scale stores the the zero
load signal.
• The display will show C xxx where xxx is the
calibration weight in grams.
• Place the appropriate calibration weight on the
platform.
• Press On/Off Zero button.
• The display shows -C- while the scale stores the
calibration point signal.
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9/14/2005, 2:56 PM