64
Subject to change without notice
42
RV4502:
Calibrator Output
– Locate and identify RV4502 on CC-Board.
– Connect the reference lead of a multimeter to chassis and
the other lead with the inner lead of the 0.2 V
pp
calibrator
output socket.
– Select DC voltage measurement on the multimeter.
– Locate and identify IC4503 on CC-Board.
– Make a short from chassis to pin 4 (Preset) at IC4503.
– Adjust RV4502 for exactly 0.200 V
DC
reading.
– Remove short and multimeter.
Please note!
Neither the calibrator signal frequency nor the pulse duty
factor are specifi ed.
43 XY mode: X-Amplifi er Bandwidth Check
– Connect a 40 mV
pp
/50 kHz sine wave signal from a Constant
Amplitude Generator via a 50 Ω through-termination to the
input of CH I.
– Set input attenuator CH I to 5 mV/div.
– Rotate variable gain knob clockwise to CAL. position.
– Set input coupling to DC.
– Press X-Y pushbutton (IN position).
– Adjust the generator amplitude for 8 div. trace length on
the screen.
– Increase the generator frequency until the signal is display-
ed with 5.6 div. length ( -3dB).
– Check that the generator frequency shows a value above
2.5 MHz.
CC-Board
RV4501
RV4502
50 kHz
-3dB
>
2.5 MHz
44 Trigger Filter Check
– Set time base to 1 ms/div.
– Connect a 1 kHz sine wave signal, 40 mV
pp
amplitude, to
input CH I and check for full screen defl ection (80 mm at
5 mV/div).
– Set input attenuator CH I to 50 mV/div and check for 8 mm
display height.
– Set trigger coupling to AC, DC and LF. The signal must
always trigger.
– Set time base to 50 μs/div.
– Set sine wave generator to 50 kHz and 40 mV
pp
output
amplitude and check for 8 mm display height.
– Set trigger coupling to AC and DC. The signal must always
trigger.
– Select LF trigger coupling. Now the signal should not trig-
ger.
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
