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Installation
2–18
1780R-Series Service Manual
In the procedures that follow the 1780R-Series front-panel control names are in
ALL CAPITALS and menu items are enclosed in <>.
The Calibration menu is available for both vector and waveform, and uses both
CRTs.
Pushing the front-panel CALIBRATE button provides access to the menu.
Several calibration features can be selected using the touch screen. Refer to the
following Waveform and Vector calibration procedures.
To toggle the display between vectorscope and waveform calibration, push the
buttons under the CRTs. When waveform is selected, the waveform calibrator is
displayed on the right CRT, with waveform menu selections on the left CRT
(vectorscope display blanked). When vectorscope is selected, the arrangement is
reversed.
The internal calibrator signal is selected by touching the <CAL SIGNAL> area
of the screen until <ON> is outlined. It automatically reverts to <OFF> when the
Calibration menu is exited and must be reselected (if desired) when the menu is
reentered. (CAL signal is not available in <CAL AMPL ZERO SET>.)
An external 1.0 Volt reference signal is required to adjust the External Horizontal
Input gain.
VOLT CURSORS ZERO SET, CAL AMPL ZERO SET, and HORIZ POSI-
TION KNOB CAL provide menu displays on the Waveform CRT. The selection
is indicated by a box on the Vectorscope CRT, and the large knob function is
circled on the Waveform CRT.
HORIZ CAL, EXT HORIZ CAL, VERT CAL, READOUT INTENSITY, and
TRACE ROTATION will be circled, when selected, to indicate large knob
assignment.
Changes in calibration will be stored when the Calibrate menu is exited. Exit by
pushing the CALIBRATE menu button or by pushing another menu button.
NOTE. Preparation is usually not required before performing this procedure.
However, if something occurs to cause calibration data to be reset or invalid
(such as loss of Non-volatile memory or installation of new software), then Step
3 of the ADJUSTMENT PROCEDURE must be performed prior to the Initial
Calibration Procedure.
1. Apply a video signal to a 1780R-Series input channel and select that channel
for display. Check that the input channel is terminated into 75 W.
Calibration Menu
Information
Waveform Calibration
Information
Waveform Calibration
Procedure