NI PXI/PCI-5411/5431
Pre-Attenuation Offset
The NI PXI/PCI-5411/5431 supports a DC offset of up to ±2.5 V before the attenuation chain. Unless the 10 dB attenuator is switched on, which occurs when the gain is less than 1.58 V or the amplitude is less then 3.16 Vpk-pk, the waveform maximum plus the offset must not exceed ±5 V into 50 Ω if it does, the waveform is clipped.
NI-FGEN automatically calculates the pre-attenuation offset value based on the DC offset and gain or amplitude values. In Arbitrary Waveform Generation mode (NI 5411/5431 only), the allowable DC offset range is dependent on the amplitude. For example, if you have a gain of 0.5 V or an amplitude of 1 Vpk-pk, the maximum DC offset you can apply is 0.25 V, which corresponds to a pre-attenuation offset of 2.5 V. In Function Generation mode, the allowable DC offset is independent of the amplitude.
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Note You can change the DC offset at any time during waveform generation. |