Lambda SR1, Руководство по эксплуатации, Страница: 56 / 317

SR1 Operation Manual 56
© 2014 Stanford Research Systems
The polarity check waveform uses a phased combination of two sine waves to produce a deliberately
asymmetric waveform that points "up". When this waveform is applied to a device under test it is easy to
see if the device properly maintains or inverts polarity by checking the output waveform using the time
record of the
FFT Analyzer . If the output waveform still points "up" the device maintains polarity. If the
waveform points "down" the device is inverting.
Polarity Waveform Non-Inverted ...And Inverted
Constant (Offset)
The constant waveform simply adds a DC offset to the output. The offset can be set anywhere over the
full positive and negative range of the generator output. Offset waveforms take up space in the
generator's D/A converter and reduce the resolution available to other waveforms. For the best distortion
and noise keep the offset as small as possible.