I generated an analog voltage from NI-SCC-68. The voltage is then measured using a voltmeter and produced exactly the voltage that I wanted. For example, if I generated 5V, the voltmeter reads 5V.
However, when I connect the voltage source from the NI-SCC-68 to a thermoelectric cooler (TEC) (at the same time, I measure the voltage output using voltmeter), the output voltage does'nt show the value that I generated. For example if I generated 5V, the voltmeter reads 0V.
Please help me. Is the problem comes from the thermoeletric cooler (TEC)? Because to operate TEC requires current source. So, do I have to change to current source instead of voltage source?