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Operating Instructions—7623A/R7623A Operators
HORIZONTAL DEFLECTION SYSTEM
26.
Disconnectall input signals and set the TRIG SOURCE to VERT MODE. Position the start of
the sweep to the left graticule line with the time-base unit position control.
27.
Connect a 10X probe to the input of the right vertical unit. Set the right vertical unit for a
deflection factor of 10 volts/division and set the VERT MODE switch to RIGHT. Set the time-base unit
for a sweep rate of five milliseconds/division.
NOTE
The following step is based on an accurate 60-hertz line frequency. For
other line frequencies, this procedure will need to be changed accordingly.
28.
Connect the probetip to a line-voltage source. The display should show three complete cycles
over the 10 divisions within 0.3 division. A correct display indicates that the 7623A Horizontal Deflection
System and the time-base plug-in unit are correctly calibrated. If the display is outside the given tolerance,
either the 7623A or the time-base unit needs to be recalibrated. Refer to the Calibration section of the Ser-
vice manual, and to the time-base unit manual for adjustment procedure.
29.
Disconnect the probe from the line-voltage source and the right vertical unit. Set the VERT
MODE switch to LEFT and set the time-base unit for a sweep rate of 0.5 millisecond/division. Disconnect
all cables.
STORAGE OPERATION
30.
Connect the 4 V Calibrator signal to the input connector of the left vertical unit and set the
deflection factor for one volt/division. Set the time-base unit for single-sweep operation at 0.5 millisec-
ond/division. Be sure the time-base unit is triggered and the INTENSITY control is set to midrange.
31.
Press the STORE and BISTABLE push buttons.
32.
Press the MANual ERASE push button. If the calibrator waveform does not store, increase
the INTENSITY slightly and press the ERASE button again. If necessary, repeat this sequence until a
stored display is obtained.
33.
Press the SAVE push button. The waveform stored in the previous step should remain on the
crt. It may be necessary to adjust the SAVE INTEN control to view the display. Turn the SAVE INTEN
control throughout its range and observeits effect on the display: from dark at the counterclockwise end
to bright screen at the clockwise end.
34.
Press the ERASE button and notice that the display cannot be erased. The erase function is
locked out in the SAVE mode.
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