57
Subject to change without notice
31
RV9003:
X-Magnifi cation x10
– Locate and identify RV9003 on the XY-Board.
– Press pushbutton X-Mag. x10 (IN position).
– Set time base to 50 μs/div and time base variable control
to CAL position.
– Set Time Mark Generator to 5 μs pulse interval (f = 200 kHz)
and connect the signal to the CH I input.
– Using X-POS control, move the fi rst time mark to the left-
most graticule line.
– Adjust RV9003 so that each time mark coincides with a
vertical graticule line.
– Release X-MAG. x10 pushbutton to the OUT position.
Correct
Incorrect
Incorrect
32
C9026, C9027:
X-Magnifi cation x10 linearity
– Locate and identify C9026 and C9027 (2 wires close to the
X fi nal amplifi er transistors) on XY-Board.
– Set time base to 0.5 μs/div.
– Press MAG x10 pushbutton (IN position).
– Connect a 10 mV, 35 MHz sine wave signal via a 50 Ω cable
and a 50 Ω through-terminator to input channel I.
– Check that the sine wave signal is displayed with a height
of approx. 3-4 div.
– Set Y-POS. I knob so that the signal is displayed at the screen
centre.
– Turn X-POS. knob and watch if the sine wave signal is
compressed and expanded when being moved (accordion
effect).
– If such an effect is visible, carefully adjust the wires with
a fully isolated tool (screwdriver) until the effect is remo-
ved.
XY-Board
C9026
C9027
CV9002
XY-Board
RV9002
RV9004
RV9003
RV9006
CV9001
RV9005
RV9001
M9001
A d j u s t m e n t P r o c e d e r e H M 3 0 3 - 6
