Tektronix 784A Uživatelský manuál stáhnout pdf (Strana 140)

Performance Tests

4–64

TDS 684A, TDS 744A, & TDS 784A Service Manual

H Adjust the output of the DC calibration generator until it precisely

overlaps the top (upper) level of the stored probe compensation

signal. (This value will be near 500 mV.)

H Record the setting of the DC generator.

H Adjust the output of the DC calibration generator until it precisely

overlaps the base (lower) level of the stored probe compensation

signal. (This value will be near zero volts.)

H Record the setting of the DC generator.

f. Press CLEAR MENU to remove the menus from the display. See

Figure 4–24.

Figure 4–24: Measurement of Probe Compensator Amplitude

g. Check against limits:

H Subtract the value just obtained (base level) from that obtained

previously (top level).

H CHECK that the difference obtained is within 495 mV to 505 mV,

inclusive.

H Enter voltage difference on test record.

3. Disconnect the hookup: Disconnect the cable from CH 1.

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Tektronix 784A Uživatelský manuál Strana 140