Checks and Adjustments
3. Set both VOLTS/DIV controls to .1 V ( X I 0 probe), set both
input coupling controls to DC, and select CHI VERTICAL
MODE.
4. Place the tip of the Channel 1 probe on the PROBE ADJUST
terminal.
5. Using the approximately 1 kHz Probe Adjust signal, obtain a
5-division display.
6. Set the SEC/DIV control to display several cycles of the sig
nal. Use the Channel 1 POSITION control to vertically center
the display.
7. Check the waveform presentation for overshoot and rolloff
(see Figure 4 - 1 ) . If necessary, perform step 8 to adjust the
probe low-frequency compensation. Otherwise, proceed to
step 9.
8. Rotate the sleeve on the probe head to expose the LF COMP
adjustment capacitor (see Figure 4 - 2 ) .
Use a low-reac
tance alignment tool to adjust LF COMP and obtain a square,
or nearly square, front corner on the waveform tops (Figure
4 -1 , top tra c e ).
CORRECT
(FLAT)
OVER
COMPENSATED
(OVERSHOOT)
UNDER
COMPENSATED
(ROLLOFF)
6 7 1 7 - 1 3
Figure 4 -1 .
Probe compensation.
2205 Operator’s
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