CAUTION
When changing the input power selector range,
the power should be removed by either turning
the autotransformer power switch to off, or by
c. Adjust the Trace Alignment R1035 (see Fig. 6-8) so the
trace is aligned with the horizontal graticule centerline.
disconnecting the input power cord to the Type
491.
TABLE 6-2
Typical Ripple
Supply
Voltage Regulation
Amplitude
-10V
–9.9 to —1 0.1 V
≤1 mV
+10V 9.7 to 10.3 V
≤2 mV
+150 V 145.5 to 154.5 V
≤5 mV
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
for the remainder of the calibration.
6. Adjust Trace
a. Test equipment
b. Position a free
horizontal line.
Alignment
o
setup is given in step 5.
running trace to the graticule center
Fig. 6-8. Location of Trace Rotation R1035.
6-11
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