Tektronix SPG8000 Technical Reference page 60

Performance verification
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6. Set the Black 1, Black 2, and Black 3 signals to NTSC as follows:
a. Press the BLACK button on the SPG8000 until you see BLACK 1:
FORMAT on the menu.
b. Use the left (◄) or right (►) arrow button to select NTSC.
c. Press the ENTER button.
d. Repeat the previous substeps for the BLACK 2 and BLACK 3 outputs.
7. Press the BLACK button until you see BLACK 1 on the menu.
8. Use the up (▲) arrow button to select CALIBRATION.
9. Press the ENTER button to select Amplitude Calibration.
NOTE.
Write down the calibration setting (AMPL. DAC number) in case you
need to restore it later.
10. Check that the calibration mode signal is 0 V on the SPG8000 display. This
value is displayed in parentheses after the AMPL. DAC number.
11. Record the voltmeter reading in the test record. This is the offset value.
12. Use the right (►) arrow to select the 700 mV level.
13. Record the value in the test record.
14. Calculate the difference between the 700 mV and 0 mV signal levels and
record this in the test record.
15. Check that the calibration setting has not changed. If it has, then restore the
original value.
16. Press the BACK button to exit the calibration menu for the Black 1 signal.
17. Repeat step 7 through 16 for Black 2 and Black 3.
SPG8000 Specifications and Performance Verification