ICP DAS USA PCI-1202 Series User Manual

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PCI-1202/1602/180x Series CardMulti-Function BoardsUser Manual/ Ver. 4.8/ Mar. 2015/ PMH-0014-48/ Page: 242.4 Analog Input Signal ConnectionThe PEX-1202 and PCI-1202/1602/1800/1802 series can measure single-ended or differential-type analoginput signal. Some analog signals can be measured in both modes. However, some analog signals only can bemeasured in one or the other. The user must decide which mode is suitable for measurement.In general, there are 4 different analog signal connection methods (shown from Figure 2.4-1 to Figure 2.4-5).The connection in Figure 2.4-1 is suitable for grounded analog input signals. The Figure 2.4-3 connection isused to measure more channels than in Figure 2.4-1, but it is only suitable for analog signals that large than 1V. The connection in Figure 2.4-4 is suitable for thermocouple and the Figure 2.4-5 connection is suitable forfloating analog input signals.Note: In Figure 2.4-4 the maximum common mode voltage between the analog input source and the AGNDis 70 Vp-p, so the user must take care that the input signal is under this specification first. If the commonmode voltage is over 70 Vp-p, the input multiplexer will be permanently damaged!The simple way to select your input signal connection configuration is listed below.1. Grounded source input signal  see Figure 2.4-12. Thermocouple input signal  see Figure 2.4-43. Floating source input signal  see Figure 2.4-54. If Vin > 1 V, the gain<=10 and more channels are needed  see Figure 2.4-35. Current source input signal  see Figure 2.4-6If you are unsure of the characteristics of your input signal, follow these test step:1. Step1 : Try and record the measurement result of the Figure 2.4-12. Step2 : Try and record the measurement result of the Figure 2.4-53. Step3 : Try and record the measurement result of the Figure 2.4-34. Compare the three results and select the best one