Advantech PCI-1720 Instrukcja Użytkownika Pobierz pdf (Strona 35)

Appendix A Calibration 31

You should use a precision voltmeter/ammeter to obtain accurate

readings when calibrating the PCI-1720. Standard procedures for

performing a calibration are given below.

A.2 Unipolar Output Calibration

1. Select an appropriate output range for the channel to be calibrated.

2. Set all digital input codes to 0. Then adjust VRn (n = 5, 6, 7, 8

depending on what channel is to be calibrated, see prior page) until

your voltmeter’s reading is 0.000 volts.

3. Set all digital input codes to 1 (see Unipolar Binary Code Table in

Section 4.3). Now, adjust VRn (n = 1, 2, 3, 4 depending on what

channel is to be calibrated, see prior page) until your voltmeter

shows a reading equal to the output voltage shown in the Unipolar

Binary Code Table in Section 4.3.

4. Repeat steps 2 and 3 until both of them are satisfied.

A.3 Bipolar Output Calibration

1. Select an appropriate output range for the channel to be calibrated.

2. Set all digital input codes to 100000000000. Adjust VRn (n = 5, 6,

7, 8 depending on what channel is to be calibrated, see prior page)

until your voltmeter’s reading is 0.000 volts.

3. Set all digital input codes to 1 (see Bipolar Binary Code Table in

Section 4.3). Now, adjust VRn (n = 1, 2, 3, 4 depending on what

channel is to be calibrated, see prior page) until your voltmeter

shows a reading equal to the output voltage shown in the Bipolar

Binary Code Table in Section 4.3.

4. Repeat steps 2 and 3 until both of them are satisfied.

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Advantech PCI-1720 Instrukcja Użytkownika Strona 35