c. Adjust the Trace Alignment R1035 (see Fig. 6-8) so the
trace is aligned with the horizontal graticule centerline.
When changing the input power selector range,
the power should be removed by either turning
disconnecting the input power cord to the Type
≤1 m V
9.9 to --1 0.1 V
≤2 m V
9.7 to 10.3 V
≤5 m V
145.5 to 154.5 V
c. The following calibration steps do not require a line
voltage control unit. Return the Line Voltage Selector to
the operating range for the existing power source voltage.
The Type 491 may be connected directly to the power source
6. Adjust Trace Alignment
a. Test equipment setup is given in step 5.
b. Position a free running trace to the graticule center