Tektronix CSA 803C, Service Manual

Page: 105 / 280

Performance Tests
CSA 803C Service Manual
4Ć37
ăStep 22:ă the Main Pos to 55 ns.
ăStep 23:ă Set the Main Pos control (lower knob) so that the zero crossĆ
ing of the waveform occurs on the center graticule.
ăStep 24:ă Set the horizontal reference point to Center as follows, so that
the waveform will be expanded about the horizontal center:
WAVEFORM button press . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Horizontal Desc (in major menu) touch . . . . . . . . . . . . . . . . . . . . . . .
Center (in popĆup menu) touch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ăStep 25:ă the Vertical Size as follows:
Vertical icon touch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Set Vert Size to 50 mV adjust upper knob . . . . . . . . . . . . . . . . . . . .
ăStep 26:ă the Main Size as follows:
Horizontal icon touch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Set the Main Size to 10 ps/div. adjust upper knob . . . . . . . . . . . . . .
ăStep 27:ă Activate the cursors as follows:
Cursors icon touch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ăStep 28:ă Read the D v located in the major menu. D v should be within
-260.5 mV and -248.1 mV or +248.1 mV and +260.5 mV, showing
that the sweep rate accuracy is within 2.5%.
ăStep 29:ă Touch Exit (in the major menu).
Sweep Rate Accuracy 1 ps/div
ăStep 30:ă the Signal Generator to the following settings:
Frequency 800 MHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Amplitude 2.0 V
pĆp
(1.4 V
RMS
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(Set for 1.000 ±0.004 V
pĆp
on screen.)
ăStep 31:ă Invoke smoothing as follows:
WAVEFORM button press . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sampling Head Fnc's (in major menu) touch . . . . . . . . . . . . . . . . . .
Smoothing On (in popĆup menu) touch . . . . . . . . . . . . . . . . . . . . . . .
Exit (in popĆup menu) touch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ăStep 32:ă the Main Size to 130 ps/div.
ăStep 33:ă the Main Pos to 55 ns.
ăStep 34:ă Set the Main Pos control (lower knob) so that the zero crossĆ
ing of the waveform occurs on the center graticule.