DayTronic 5M78 Manuale - Pagina 11

Sfoglia online o scarica il pdf Manuale per Unità di controllo DayTronic 5M78. DayTronic 5M78 16. Ac strain gage conditioner module

3. CALIBRATION

Remote Calibration Check

(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 5M78 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.

Switch 1 - Mode - selects current (I) or voltage analog output

Switch 2 - Volts - selects +/- 5 or +/- 10 Vdc when mode is voltage

Switch 3 - Current - selects 4-12-20 or 4-20mA when mode is current

Switch 4 - Filter - selects 650 Hz or 100 Hz at 3 db, for 100 Hz switch 5 must be set to the right

Switch 5 - Filter - selects 10 Hz or 100 Hz at 3 db, for 100 Hz switch 4 must be set to the right

Switch 6 - Sync - selects excitaton clock to slave from a master module or to be master

Switch 7 - Zero Adj. - selects extended (100%) or normal (25%) zero authority

Switch 8 - Aux Output - selects SYNC terminal output for use by other linked modules

Coarse Zero - 16 position switch adjustment for stepped zero balance control

Fine Zero - 18 turn potentiometer for fine zero balance control

Coarse Span - 16 position switch adjustment for stepped gain contr ol

Fine Span - 18 turn potentiometer for fine gain - span control

Symmetry - adjust the negative output span to be equal to the positive output

Phase - adjustment for phasing the AC modulated signal to its highest level at load

Over Range - indicates when the analog output is 2% greater than mode selected

Power - indicates the power input voltage is ON

(cont.)

The instrument can be placed in the calibration mode

or in the AUX position for raw - uncalibrated analog gained voltage output

marked for calibration default position

Fig. 2 Front Panel Settings and Indicators

Calibraton 5M78.3