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Installation
1780R-Series Service Manual
2–19
2. Push the front-panel CONFIGURE button and touch <FIXED CAL AMPL>
until 1000 (1.0 Volt) is outlined.
3. Push the front-panel CALIBRATE button. Push the button below the
Waveform CRT.
4. <READOUT INTENSITY> will be circled on the Vectorscope CRT. Use the
large knob to adjust intensity. (The front-panel INTENSITY control adjusts
signal intensity only. Readout intensity must be adjusted through the
Calibration menu.)
NOTE. Step 5 is to be performed for instruments SN B020244 and below only.
5. Touch <HORIZ POS KNOB CAL> to calibrate the HORIZ POS knob. A
menu will be displayed on the Waveform CRT. Center the HORIZ POS
control by turning the control and then releasing it, allowing the spring (not
necessarily the signal display) to return to midpoint of its range. Then touch
the area labeled: <CENTER HORIZONTAL POSITION KNOB, THEN
PRESS HERE>. This tells the microprocessor that the knob is now at the
midpoint, or zero point, of its range. This zero point is referred to as the
Dead Zone, and its tolerance can be varied by touching <INCREASE> or
<DECREASE>. The value changes in single step increments from the
smallest possible setting of 1 unit up to 16 units, and current value is shown
on the readout. A beep sounds when the Dead Zone has been increased or
decreased as much as possible. If the Dead Zone is increased, the control
must be turned slightly before it will respond, but will also return to center
more readily after it is turned.
6. Touch <TRACE ROTATION> to obtain a test axis, then use the large knob
to adjust trace rotation. Align the horizontal lines of the electronic graticule
with the Waveform CRT graticule horizontal lines.
7. Touch <CAL AMPL ZERO SET> to obtain a menu on the Waveform CRT
for adjusting the calibrator zero level. Adjust the large knob to overlay the
two waveforms. Press the front-panel REFERENCE SET button to record
this zero setting.
8. Touch <VOLT CURSORS ZERO SET> to obtain a voltage cursor menu on
the Waveform CRT. Use the large knob to move the cursors, touching the
<CURSOR 1 / CURSOR 2> area to toggle between Cursors One and Two.
When cursors are aligned, press REFERENCE SET to reset the displayed
voltage difference to zero.
9. Touch <CAL SIGNAL ON / OFF> until <ON> is outlined. (Calibration
signal is not available in <CAL AMP ZERO SET>.) Check that the WFM
HORIZONTAL–TWO–LINE sweep is selected and VAR sweep is off.