Lambda SR1, Operation Manual, Page: 116 / 317

SR1 Operation Manual 116
© 2014 Stanford Research Systems
and a variable measurement rate. Depending on the selected measurement one of the following functions
of the amplitude and levels will be displayed:
Measurement selects the quantity displayed on the TDD panel
Amplitude The selected channel amplitude is displayed. All filtering options are available.
Ratio The ratio of the selected channel amplitude to the level of the other channel is
displayed. This mode can be used, for instance, to make crosstalk
measurements.
THD+N Amplitude The selected channel amplitude is displayed. The notch filter is always selected
to filter the fundamental. The amplitude signal then represents the total noise and
distortion present in the input signal.
THD+N Ratio The ratio of the amplitude to the level of the selected channel is displayed. The
notch filter is always selected. This selection displays THD+N amplitude relative
to the total amplitude of the signal.
Crest Factor The ration of the peak amplitude of the selected channel to the RMS amplitude of
the same channel is displayed.
Time Domain Detector: Analog Hi Bandwidth Inputs
To fully exploit the capabilites of SR1's analyzers i is useful to understand exactly how SR1 functions for
each of the three classes of inputs: analog signals using the Hi Bandwidth converter (HiBw), analog
signals using the Hi Resolution converter (HiRes), and digital audio signals. Below is a block diagram of
the TDD for analog signals when the HiBw converter is selected.
Detailed TDD Block Diagram : HiBW Analog Inputs
(Show n for ChA Selected)