User`s guide

Chapter 6 __________________________________________________ Calibration and Adjustment

VAISALA_______________________________________________________________________ 63

Connections

0505-293

Figure 25 Connecting Power Supply and Multimeter for

Calibration

1. Connect a power supply (12 ... 24 VDC, with a serial port the

minimum supply voltage is 15 VDC ) to the terminals B1 (-) and C1

(+) (Ch 1) with banana plugs, see Figure 25 on page 63.

2. Connect the multimeter in series with the supply, B1 (-) and A1 (+).

3. Follow the same procedure with Ch 2 using the terminals B2 (-) and

C2 (+). When calibrating both channels at the same time, use two

galvanically separated power supplies.

You can now calibrate or check the humidity and temperature or the analog

outputs according to the instructions given in this chapter.

If the current measurement is needed in a hazardous area, the multimeter

is connected to the terminals A1/A2 (+) and B1/B2 (-). Use only an

approved multimeter.

WARNING

The power supply connectors (C1 and C2) MUST NOT be used in

hazardous areas. For calibration and adjustment in a hazardous area use

only an approved multimeter, which fulfills the safety factors printed on

the protective cover.

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