Weidmuller STG - Bridge measuring transducer Manuale Utente Scaricare il pdf (Pagina 18)

• Calibration

General

All instruments are fully calibrated before leaving the factory. For best

results, you may need to adjust the zero and span after installation,

since the actual load may vary.

quipment requirements

• A suitable DC millivolt source

• T

wo accurate digital multimeters (accurate to 0.05 mV and ±0.1 A)

• Flat bladed screwdriver (blade width less than 2.54 mm / 0.1 inch)

Terminal connections for workshop calibration

Connect Signal type Terminal

DC millivolt source

0 V Refence (Link to Terminal 8) 6

Input signal mV (+) 7

Input signal mV (−) 8

Multimeter one

Output signal mA or V (+) 13

Output signal mA or V (−) 14

Multimeter two

TARE adjustment mV (+) Test Point (Ex+)

TARE adjustment mV (−) Test Point (Ex–)

Wire link

Excitation Voltage (+) 3

Excitation Sense (+) 2

Wire link

Excitation Voltage (−) 4

Excitation Sense (−) 1

Power supply

Neutral (−) 10

Live (+) 11

ZERO and SPAN adjustment

The TARE, ZE

RO and SPAN controls are on the front panel of the

transmitter. Turn the control clockwise to increase adjustment.

Note: ‘zero’ means the lowest point in the signal range, so for a

-20 mA signal, ‘zero’ is 4.00 mA. ‘Full scale’ refers to the highest point

in the signal range.

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Weidmuller STG - Bridge measuring transducer Manuale Utente Pagina 18