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3. CALIBRATION

Remote Calibration Check: The instrument can be placed in the calibration mode (positive or negative) by

shorting terminals Power Common and SHP for positive or SHN for negative on the lower I/O connector.

Figure 4 indicates two methods of remotely entering the calibration mode (external switch, or push

button control). The Remote Cal function provides a convenient method of periodically monitoring

calibration of the instrument in the positive or negative realm.

Master/Slave Connections. : When more than one IL78A is being used in a measurement setup

(instruments are closely mounted or the transducer cabling is in a common conduit or raceway),

beat frequencies may be produced from the 3-kHz oscillators used in the instruments to develop the

excitation. To prevent beat frequencies from occur-ring, one unit can be designated the master, and

the remaining units can be driven from the oscillator contained in the master unit. The remaining

units are designated as slave instruments. To perform master/slave wiring, refer to Figure 7.

AC Strain Gage Conditioner Module

(cont.)

Switch 1 - Mode -

Switch 2 - Volts -

Switch 3 - Current -

Switch 4 - Filter -

Switch 5 - Filter -

Switch 6 - Sync -

Switch 7 - Zero Adj. -

Switch 8 - Aux Output -

Coarse Zero -

balance control marked for calibration default position

Fine Zero -

Coarse Span -

contr ol marked for calibration default position

Fine Span -

Symmetry -

Phase -

Over Range -

Power -

Fig. 2 Front Panel Settings and Indicators

current (I) or voltage analog output

+/- 5 or +/- 10 Vdc when mode is voltage

4-12-20 or 4-20mA when mode is current

650 Hz or 100 Hz at 3 db, for 100 Hz switch 5 must be set down

10 Hz or 100 Hz at 3 db, for 100 Hz switch 4 must be set down

excitaton clock to slave from a master module or to be master

extended (100%) or normal (25%) zero authority

SYC terminal output for use by other modules

16 position switch adjustment for stepped zero

18 turn potentiometer for fine zero balance control

16 position switch adjustment for stepped gain

18 turn potentiometer for fine gain - span control

adjust the negative output span to be equal

to the positive output

adjustment for phasing the AC modulated signal to its

highest level at load

indicates when the analog output is 2% greater

than mode selected

indicates the power input voltage is ON

IL78A

Calibration IL78A.3