Trigger Dc Balance Adjustment; Y-Out Dc Balance Adjuustment .00; Y-Out Gain Adjustmene - Philips PM3208 Service Manual

5-10
5.3.20
5.3.21
5.3.22
5.3.23
Vertical bandwidth
TEST EQUIPMENT
SETTING
REQUIREMENTS
SETTING AND
REQUIREMENTS
SETTING AND
REQUIREMENTS
ADJUSTMENT
SETTING AND
REQUIREMENTS
5 PERFORMANCE CHECK AND ADJUSTMENT PROCEDURE
Constant amplitude sine-wave generator
Vertical mode - A
Channel A AMPL/DIV - 10 mV
Apply a 50 kHz reference sine-wave signal to channel! A and
adjust the trace height to exactly 6 div.
Check that the trace height is = 4,2 div at 20 MHz.
Repeat for AMPL/DIV - 0,1 V.
Repeat for AMPL/DIV - 1 V.
NO
Repeat for channel B
Trigger DC balance adjustment
TEST EQUIPMENT
SETTING
ADJUSTMENT
SETTING
ADJUSTMENT
NO
Vertical mode - A
Channel A coupling - DC
Trigger coupling - AC
Apply the CAL signal to channel A and set for 2 div.
Repeat for channel B.
Repeat for channel B by means of VR173 (VERT PCB).
Y-out DC balance adjustment
TEST EQUIPMENT
SETTING
ADJUSTMENT
NO
Vertical mode -A
Channel A coupling - GND
Channel A AMPL/DIV - 5 mV
Set the trace at the centre of the Y-axis.
Y-out gain adjustment
TEST EQUIPMENT
SETTING
ADJUSTMENT
NO
Vertical mode - DUAL
Both channel A and B coupling - DC
Horizontal mode - MTB.
TIME/DIV - 0,2 ms