Tektronix 2714 User Manual page 154

NOTE
method of determining a signal's frequency.
graticule line and press [CTR MEAS/TRKG].
The calibration signal is recentered, and the amplitude and frequency
of the centered signal are read out at the upper right of the screen
resolution can be set to 1 Hz if desired. The counter readings disap-
pear when a control setting is altered.
The marker and counter amplitude readouts are equally accurate.
However, the signal amplitude indicated by the position of the marker
relative to the graticule may differ slightly from the readout. The
readout is more accurate because it contains no display nonlinearities.
The center frequency and counter measurements are also equally
accurate, but in general the counter readout is more precise.
To look closely at the calibration signal third harmonic, place the
marker near the third harmonic (approximately 280 MHz) and press
(CTR MEAS/TRKG].
The calibration signal third harmonic is now the new center frequency
and its frequency and amplitude are displayed at the top of the right-
hand readouts.
Now enter the delta-marker mode. Place the movable marker near the
calibration signal fundamental (at 100 MHz) and press [CTR MEAS/
TRKG].
This mode of operation centers the signal peak nearest the movable
marker and measures the difference between the centered signal and
the signal at the fixed marker. In this case, the fundamental is re-
centered, and the markers appear on top of it and the third harmonic.
Readings of approximately 200 MHz and 12 dB appear at the top of
the left column preceded by the letters DC (delta-counter). The center
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