Tektronix 1S1 Instruction Manual page 100

2.5 cm of the horizontal centerline, indicating a dc volt-
age of +67.5 volts ±2.5 volts.
l. Touch the test probe to the junction of D186 and D188
(see Fig. 5-42.)
m. Check that the test oscilloscope trace is within 2.5 cm
of the horizontal centerline, indicating a dc voltage of
+67.5 volts ±2.5 volts.
n. Remove the probe from the test point.
o. Disconnect the 1X probe from the test oscilloscope
vertical input.
NOTES
Calibration – Type 1S1
5-37