Tektronix 543B Instruction Manual page 30

Calibration — Type 543B/RM543B
TRIG LEVEL
CENTERING
PRESET
ADJUST
Test Point
fcgwii-nrrrn " - r
Junction o f
R I9 and R20
Fig- 5-3. Location o f internal adjustments and test points fo r time base and crt circuit.
Now set the Test Function switch to Gain Set and the
AMPLITUDE CALIBRATOR to 100 VOLTS. Connect a jumper
from the CAL OUT connector to the Ext Input connector of
the TU-7. Adjust GAIN R520 for exactly 4 cm of vertical
separation between the two traces. Be sure measurements
are always made from the same side of the trace. Vary the
line voltage 10% above and below design center line volt­
age, the gain should not change more than 3%.
Set the AMPLITUDE CALIBRATOR to 2 VOLTS and set the
Type TU-7 Test Function switch to Low Load. Adjust the
5-4
EXT HORIZ
SWP
AMP DC BAL GEOMETRY LENGTH
T —
Pin 7 o f HIGH
V125 VOLTAGE
Fig. 5-4. Adjustm ent of GEOMETRY control.
S W P /M A G C388
REGIS /
' i n i . r 7 in \ m iii7 r w t \ ii'i — rrmwgii------- mrnmvr-----
Type TU-7 Variable control for a 2-cm vertical separation
between the two traces. This adjustment is made using the
center 2-centimeter area of the crt.
Move the display up and down, end measure any changes
in apparent sensitivity at different points. The signal must
not be compressed or expanded more than 1.5 mm at either
the top or bottom extremes of the graticule.
Disconnect the jumper from the CAL OUT connector to
the Ext Input connector and center the trace. Vary the line
HIGH VOITAGE
TEST POINT