Configuring National Instruments Signal Generators to Operate with Loads Other Than 50 OhmsHardware: Signal Sources (AWG/FG/AO)>>Arbitrary Waveform and Function Generators>>PCI-5406
Problem: I am developing an application that will use the PCI-5406 signal generator to output waveforms to a load that is not 50 Ohms. Since the default output impedance of the signal generator is 50 Ohms, can I use the PCI-5406 to generate waveforms for loads whose impedances do not match the output impedance of the signal generator? Solution: Yes. When using the default output impedance of 50 Ohms, the maximum voltage output level of the signal generator is ±5 V when connected to a terminal with load impedance of 50 Ohms, while the maximum voltage output level is ±10 V when connected to a terminal with high load impedance. For all other load impedances, the maximum output voltage levels are determined by the following equation: VOut = ±[ RL / ( RL + RO) ] where VOut is the maximum peak output voltage level RL is the load impedance in Ohms RO is the output impedance of the function generator in Ohms The NI-5406 signal generator employs a feature called load impedance compensation, which uses an algorithm to configure the amplitude of the output signal based on the user-defined load impedance setting. The user can set the load impedance using the niFGEN Property Node (see image) and selecting Output Attributes » Load Impedance.  Related Links: NI Signal Generators Help (June 2008) Attachments:
Report Date: 09/03/2008 Last Updated: 11/05/2008 Document ID: 4P2E6FVP |
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