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1780R-Series Service Manual
signals. The probe input has gain and input compensation for both X1 and X10
probes.
The instrument control system is based on a National Semiconductor 32CG16
Microprocessor, with an additional line rate processor that makes line-by-line
measurement decisions. Front-panel switching and CRT touch-screen selections
are acted upon by the processors. The front-panel switches are momentary
touch-type, which toggle through a short list of functions and provide additional
selections when held in. Each switch has a back-lighted functional indicator or
built-in indicator to relay switch status to the operator. In addition to sensing and
acting on switch and touch panel changes, the Microprocessor controls the
alphanumeric CRT readout for menu selections and measurement results.
The current front-panel configuration (switch and touch screen) is always stored
in non-volatile memory allowing the instrument to power back up in its previous
measurement configuration. In addition, front-panel configurations can be stored
and recalled (one-button measurement), like the Tektronix 1730-Series.
The use of touch screens and an assignable, multi-function control greatly
simplifies the operator interface. The control is an optical encoder that is used for
line selection, voltage measurements, timing measurements, and subcarrier phase
measurements, along with other menu/touch screen assigned tasks. A pair of
push buttons, adjacent to the control, can be used to duplicate the function of the
control when individual steps are desired.
The waveform monitor has reduced spot size and provides a bright display for
showing an individual line. The left CRT provides the vectorscope, picture
monitor, SCH phase and XY displays. Both CRTs have internal measurement
graticules, and can accommodate external graticules that are used for specialized
measurements and some photographic applications. Variable graticule scale
illumination provides uniform lighting over the usable area for both the internal
and external graticules.
CRT Options
Option 74 provides a P4 (white) phosphor tube.
Power Cord Options
Any of the power cord options described in Maintenance can be ordered for the
1780R-Series. If no power cord option is ordered, instruments are shipped with a
North American 125 V power cord and one replacement fuse.