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Performance Tests
TDS 684A, TDS 744A, & TDS 784A Service Manual
4–37
STOP. Checking each channel’s bandwidth at all vertical scale settings is time
consuming and unnecessary. You may skip checking the remaining vertical scale
settings in Table 4–4 (that is, skip the following substep, h) if this digitizing
oscilloscope has performed as follows:
H Passed the 100 mV vertical scale setting just checked in this
procedure.
H Passed the Verify Internal Adjustment, Self Compensation, and
Diagnostics procedure found under Self Tests, on page 4–5.
NOTE. Passing the signal path compensation confirms the signal path for all
vertical scale settings for all channels. Passing the internal diagnostics ensures
that the factory-set adjustment constants that control the bandwidth for each
vertical scale setting have not changed.
h. Check remaining vertical scale settings against limits (optional):
H If desired, finish checking the remaining vertical scale settings for
the channel under test by repeating substeps d through g for each of
the remaining scale settings listed in Table 4–4 for the channel under
test.
H When doing substep e, skip the subparts that turn on the CHx Pk-Pk
measurement until you check a new channel.
H Install/remove 10X attenuators between the generator leveling head
and the channel input as needed to obtain the six division reference
signals listed in the table.
i. Test all channels: Repeat substeps a through g for all four channels.
3. Disconnect the hookup: Disconnect the test hook up from the input
connector of the channel last tested.
Equipment
Required
One medium-frequency leveled sine wave generator (Item 11)
One precision coaxial cable (Item 5)
One 50 W terminator (Item 4)
One dual-input coupler (Item 8)
Prerequisites See page 4–15
Check Delay Between
Channels