1290 Strain Gage Input Indicator 21
After the last step , the calibration is complete. The display shows the measured input variable in bits
(approximately 1.6 microvolt/bit).
NOTE: The above procedure only applies to indicators ordered with the output option. Units are
precalibrated from the factory.
5. OPERATING MODE
In this mode the Model 1290 monitors the input signal, displays the measured value, and performs
alarm functions. You can display high and low peak values, lock and unlock the keyboard, reset
alarms, and perform transducer input calibration and alarm threshold settings. It is also possible to
load default parameters.
Parameter values listed below can always be viewed, but they can only be modified if the indicator
keyboard is unlocked. If anyone attempts to modify parameters when the indicator is locked, the
display will show
inh
.
5.1 KEYBOARD LOCK/UNLOCK
When the measured value is displayed (normal operating mode), you can lock or unlock the
keyboard by holding down the buttons in the following order; ▼ + R + F. The display will then
show the new desired mode:
Loc
or
UnLoc
.
5.2 TRANSDUCER INPUT CALIBRATION
You can modify the operating parameters and load default data only when the instrument is
unlocked and in local mode. Default values are shown on page 24.
NOTE:
1. Transducer/ Indicator calibration should be performed with the transducer at operating
temperature, and with no pressure applied.
2. The Zero and Full scale calibrations should be done concurrently.
1. ZERO TRANSDUCER CALIBRATION
Press F to enter the calibration mode.
The display will show
LO.OFF
.
Press the ▲ key once.
The display will show
LO.On
.
Press the F key to perform the zero calibration.
The display will blank except for 5 decimal points.
After a brief “time out” the unit will enter full scale calibration.
NOTE: In lieu of the ▲ key, pressing the F key will advance the indicator to the next parameter.
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