Heathkit IO-4550 - Page 30

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POSITION
Page 28
VERTICAL AMPLIFIER
Set the indicated front panel controls as follows:
TIME/CM 1mS
Y1:
VOLTS/CM 200 mV
POSITION Center trace on screen
INPUT switch GND
Y2:
VOLTS/CM 200 mV
Fully counterclockwise (OF F)
INPUT switch GND
Channel Y1: Perform the following lettered steps
(A-G). Adjust only the controls marked Y1 or
associated with Channel Y1.
A. Adjust the POSITION control to place the trace
on the horizontal centerline.
B. Make sure the VARIABLE control is fully
clockwise (CAL) position.
C. Set the INPUT switch to AC.
D. Connect the test cable inner lead to the 1V P-P
connector on the front panel. NOTE: A Square
Wave Voltage Calibrator may be used instead of
the 1V P-P output from the Oscilloscope.
E. Adjust the CAL control (R164, on the vertical
circuit board) and the POSITION control for a
waveform exactly 5 cm high between the flattest
portions.
F. Disconnect the test leads from the 1V P-P
connector.
G. Turn the -POSITION control fully
counterclockwise (OFF).
Channel Y2: Turn the TRIG switch to the Y2, +
position. Then perform the previous lettered steps
(A-G) again for Channel Y2. Adjust only the controls
marked Y2 or associated with Channel Y2.
SWEEP
Set the indicated front panel controls as follows:
Y1 INPUT switch AC
TRIG Y1,+
TIME/CM 1mS
VARIABLE CAL
Connect a 1000 Hz square wave signal to the Y1
INPUT connector. Adjust the signal amplitude for a
2-4 cm vertical display.
Adjust the SWEEP LENGTH control (R255, on the
horizontal circuit board) so the trace is 10 cm long.
Refer to Figure 17 in the “Illustration Booklet” and
carefully adjust the X CAL control (R268, on the
horizontal circuit board) and the HORIZ POS control
for exactly 10 cycles in 10 centimeters (1 cycle per
centimeter) as shown in Figure 18. Use the leading
edge of the second and tenth cycle for this
adjustment.