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REFERENCE LINE
Harmonic distortion of the modulating signal can be
measured as in MARKER m , Chapter 6.
The modulation frequency is 18.8 kHz and the distor-
tion caused by the second harmonic is 2.4% (read out
as .024X).
REFERENCE LINE
The reference line functions, DISPLAY LINE (DL) and THRESHOLD (TH), place horizontal reference lines on
the display. Their levels are read out in absolute amplitude units.
DISPLAY LINE uses
l
measure signal levels with direct readout.
l
establish a standard for go/no-go test comparisons.
eliminate or reduce amplitude errors due to system frequency response uncertainty
THRESHOLD provides:
l
a base line clipper whose level is read out.
a minimum threshold level that can be set.
DISPLAY LINE
DISPLAY LINE [1.1113 (DATA entry) places a horizontal reference line at any level on the graticule. The line's
amplitude, in reference level units, is read out on the left-hand side of the CRT display.
64 Manual Operation
SCALE AND REFERENCE LINE
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