3 - 2
BRIEF CHECKING PROCEDURE
Trace alignment:
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Turn the oscilloscope on with the POWER ON OFF key.
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Press the STATUS and TEXT OFF keys simultaneously. This ensures that the
oscilloscope is in the default mode. The default mode is the basis of this brief
checking procedure.
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Press the AUTOSET key.
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Turn the TRACE INTENSITY control so that a clearly visible horizontal line
appears on the CRT.
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Press the TEXT OFF key when no text is present on the CRT. Turn the TEXT
INTENSITY control so that clearly visible text appears on the CRT.
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Turn the FOCUS control to make the line and text look as sharp as possible
across the CRT area.
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Turn the GRATICULE ILLUMINATION control so that the desired illumination
of the measuring graticule is obtained.
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Verify that the trace on the CRT is exactly parallel to the horizontal lines of the
measuring raster; if not, correct this with a small screwdriver on the TRACE
ROTATION control.
Instrument calibration.
Press the CAL key for two seconds: this starts the AUTOCALibration procedure.
Wait until the normal display appears again. The oscilloscope calibration is now
optimized.
Probe adjustment:
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Connect a 10 : 1 probe to the CH1 input.
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Connect the probe tip to the Probe Adjust output socket.
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Press the green AUTOSET key.
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Verify that a square-wave signal is displayed on the CRT.
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Verify that top and bottom of the square wave are straight: if not, this must be
corrected by adjusting the probe. The correction is done with a small
screwdriver. This adjustment is made in the box at the oscilloscope input side
of the probe: refer to figure 3.1 for this.