Chapter 2 65
Front-Panel Key Reference
Auto Couple
Auto Couple
Accesses the menus to couple functions in your analyzer. Coupled
functions are functions that are linked.
Auto All Auto-couples all coupled functions. If Auto All is pressed all coupled
functions are set to Auto.
Coupled functions are functions that are linked. If one function is
changed, the coupled function is changed. During normal operation,
resolution bandwidth, video bandwidth, and sweep time are coupled to
center frequency.
If any of these functions become uncoupled (is set to manual), a # sign
appears next to the screen annotation representing the function on the
screen. If one or more functions are manually set so that the amplitude
or frequency becomes uncalibrated “Meas Uncal” appears on the top
right side of the graticule.
To recouple the analyzer functions, the uncoupled function(s) must be
individually set back to Auto. Or, you can press
Auto All to return all of
the functions to their default auto state. Pressing
Auto All will couple
the following functions:
• For normal operation with EMI resolution bandwidths, the
intermediate frequency bandwidth couples to the center frequency of
a given span. With SA resolution bandwidth, the intermediate
frequency bandwidth couples to the current span. However, pressing
Auto All always couples the analyzer with the appropriate EMI
resolution bandwidth for the center frequency of the given span.
• Video bandwidth couples to resolution bandwidth. A video
bandwidth to resolution bandwidth ratio of 3.0 is maintained when
EMI resolution bandwidths are selected. The ratio is 1.0 when SA
resolution bandwidths are selected.
• Sweep time will couple to the span, resolution bandwidth, and video
bandwidth.
•
Detector (Auto) is set.
•
Avg Type (Auto) is set.
•
PHNoise Opt (Auto) is set.
• RF attenuation couples to reference level.
• Center frequency step size will couple to 10% of span.
• Sweep coupling (SR/SA) will couple back to SA mode.
• Source attenuation couples to source amplitude.
• Source power step couples to one vertical scale division.
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