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Performance Verification
1780R-Series Service Manual
4–17
6. Check Voltage Cursor Accuracy
Requirement: Accuracy: ±0.2%. Resolution: 1 mV.
a. With no signal applied to CH A INPUT, set the front-panel controls and
menu selection as follows: RIGHT DISPLAY–WFM+CAL, WFM
HORIZONTAL–ONE–LINE, VOLTAGE CURSORS–On (ABSOLUTE,
SEPARATE), CURSOR 1, CONFIGURE–On, PAGE 1, COUPLING–
GND, ABS UNITS–IRE (for NTSC only).
b. Use the VERT POS control to position the top trace of the Calibrator
signal to the 0 IRE (0.3 V for PAL) graticule line.
c. Rotate the Precision Measurement control so that the CURSOR 1 trace
overlays the top trace of the calibrator signal.
d. Set the WAVEFORM GAIN to X5.
e. Readjust the Precision Measurement control, if necessary, so the trace
overlays as described in part c. of this step.
f. Set the WAVEFORM GAIN–X5 to Off and select the CURSOR 2 pad
on the Waveform CRT.
g. Use parts b. through e. of this step as a guide for overlaying the
CURSOR 2 trace on the Calibrator signal bottom trace.
h. Check that the DV readout on the Waveform CRT is between 139.7 IRE
and 140.3 IRE (998 mV and 1002 mV for PAL).
i. Set the 1780R-Series front-panel controls as follows: RIGHT DIS-
PLAY–WFM, WAVEFORM GAIN–X5–Off, CURSOR 1, and VOLT-
AGE CURSORS–Off. With the CONFIGURE button set to On, select
COUPLING–DC. Press the CONFIGURE button to exit the menu.
7. Check Maximum DC Output Voltage
Supplemental: AUX OUT and PIX MON OUT connectors: ±0.5 V into
75 W
.
a. Check that no signal is applied to the 1780R-Series CH A INPUT
connector. Check that CH A INPUT is selected.
b. Establish a ground reference for Ch 1 on the test oscilloscope dual-trace
vertical amplifier.
c. Set the test oscilloscope vertical amplifier controls as follows: Ch 1
Volts/Div switch to 0.2, Ch 1 Input Coupling switch to DC, and the
Display Mode to Ch 1.