Appendix C: Performance Verification
□ Step 4: Check X-Y Plotter
a. Set the SEC/DIV switch to 10 ms.
b. Connect the digital voltmeter low lead to either chassis ground or
pin 7 (signal ground) of the X-Y Plotter connector. Connect the volts
lead to pin 3 (X Output) of the X-Y Plotter connector.
c. Set the digital voltmeter to the 20 V scale,
d. Press the Setup PLOT button to display the PLOT menu. Set Plotter
Type to XY, Grat to ON, and Auto Plot to OFF, Use the CURSORS
knob to set Plot Speed to 10.
e. Press in the Start button to activate the X-Y Plotter.
NOTE
Voltage reading of the X Output will be negative left of the center
vertical graticule line and positive to the right of the center vertical
graticule line. Voltage reading of the V output will be negative below
the center horizontal graticule line and positive above the center
horizontal graticule line.
f. Record the voltage reading as the instrument plots the 1st and the
10th graticule line (as the intensity spot moves along the graticule
line),
g. CHECK — The voltage difference between the 1st and 10th graticule
line is between 4.0 V and 6.0 V.
h. Move the volts lead of the voltmeter from pin 3 (X Output) to pin 5 (Y
Output) to the X-Y Plotter connector.
i. Press the Start button in again to activate the X-Y Plotter.
j. Record the voltage reading as the instrument plots the top and the
bottom of the graticule lines (as the intensity spot moves along the
graticule line).
k. CHECK — The voltage difference between the top and bottom
graticule line is between 3.2 V and 4.8 V.
l. Disconnect the test equipment from the instrument
2221A User Manual
A-51
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