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Performance Tests

CSA7404B, TDS7704B, TDS7404B, TDS7254B & TDS7154B Service Manual

4-67

H Use the keypad to set vertical offset to the setting listed in the table

for the current vertical scale and position settings. The baseline level

may move off screen.

H Set the generator to the level and polarity indicated in the table for

the vertical scale, position, and offset settings you have made. The

DC test level may be off screen. For all steps except the ones on the

1 V/div range, adjust the vertical offset setting as needed to bring the

DC test level to +3.8 divisions (0.2 divisions below the top of the

graticule).

e. Measure the test signal: Press Close.

H Read the measurement results at the measurement statistics 

measurement readout. S ee Figure 4--10.

H Record the Mean in the Measurement Mean column of Table 4--4.

Turn on the

measurement called

mean and read the

results here.

Figure 4- 10: Measurement of DC gain accuracy

f. Measure second mean:

H Set the generator to the second level and polarity indicated in the

table for the vertical scale, position, and offset settings you have

made. (For some settings it is possible that the DC test level appears

off screen, while the measured mean value is within tolerance.)

H Repeat substep e using the current vertical scale, position, offset, and

new generator setting for the second mean.

g. Check against limits:

H Subtract the second measurement mean from the first measurement

mean for the current vertical scale, position, and offset.

Tektronix CSA7404B Service Manual

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