DayTronic IL78A 매뉴얼 - 페이지 11

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3. CALIBRATION

This section contains the instructions for calibrating the IL78A. Included is a functional description of

the instrument front-panel (see Figure 2). To perform calibration, proceed as follows.

Turn power ON to the IL78A DC Power input terminal (11 to 28 Vdc input) The

(a)

front-panel indicator should light green to indicate the application of dc power.

Allow 10 minutes of warmup for stabilization of transducer characteristics.

Remove the top cover of the unit to make the proper connections and adjustments.

Set the Coarse Zero control to position 8 and the Coarse Span control to position 0.

(b)

Position the front panel switches to the desired settings for the application. Refer

(c)

to Figure 2 for details. If using Shunt method, refer to step (k).

With the transducer unloaded, adjust the Coarse Zero control and the Fine Zero control until

(d)

the desired analog output is achieved. If greater zero authority is desired, place the front panel

Switch 7 - "Zero Adj" to the extended range. This will allow the user to obtain 100% zero offset

control. The Normal postion of switch 7 allows for approximately 25% Zero authority.

Load the transducer in the positive direction with a convenient dead weight value (greater than one

(e)

half of full scale). Adjust Coarse Span for a nominal corresponding output. Adjust the PHASE control,

until a maximum output value is obtained. (Once set for your transducer, this PHASE ADJUSTMENT

step need not be repeated unless a change in cable length – or transducer – is required). Unload the

sensor and re-Zero as needed.

f the calibration will utilized a known "dead-weight", re-load the sensor and adjust the Coarse and

(f)

Fine Span controls for the expected analog output value. Unload - Zero and Load - Span operations

may need to be repeated for analog output precision.

Note: With sensor unloaded, activate & record "SHP" value for furture calibration verification.

If the calibration will utilize the "Shunt" calibration method, refer to step (k).

(g)

If the transducer is to be also used in the negative realm, load the transducer in

(h)

the negative direction with the same dead weight value as used in step (f) and confirm

that the dead weight reading obtained is the same, but negative polarity, as that of step

(f). If not, see steps (i) thru (j).

A Symmetry adjustment is provided to compensate for transducers that do not have

(i)

symmetrical sensitivity characteristics. This adjustment is factory set assuming

symmetrical characteristics. If step (h) indicates that a field adjustment is necessary,

proceed as follows.

AC Strain Gage Conditioner Module

(cont.)

IL78A

Calibration IL78A.3