Performance Tests
4-78
CSA7404B, TDS7704B, TDS7404B, TDS7254B & TDS7154B Service Manual
NOTE. The sine wave generator output amplitude must be leveled to within
0.35 db of the reference frequency (10 MHz) through the bandwidth frequency
listed in Table 4--7 on page 4--79. The 0.35 db requirement is necessary to ensure
a bandwidth that meets Tektronix specifications.
You can perform bandwidth PV using an unleveled sine wave generator (with
amplitude error > 0.35 db). Under these conditions, the bandwidth PV is subject
to the flatness errors associated with the generator used.
Refer to the Sine Wave Generator Leveling Procedure on page 4--137 if your sine
wave generator does not have automatic output amplitude leveling.
c. Hook up the test-signal source: Connect the sine wave output of a
leveled sine wave generator to CH 1. Set the output of the generator to a
reference frequency of 10 MHz or less. See Figure 4--15.
Instrument under test
Sine wave
generator
Output
Figure 4- 15: Initial test hookup
2. Confirm the input channels are within limits for analog bandwidth: Do the
following substeps — test CH 1 first, skipping substeps a andbsinceCH1
is already set up for testing from step 1.
a. Select an unchecked channel:
H From the tool bar, touch MEAS and then Clear to remove the
previous measurement.
H Press the Vertical button of the channel just confirmed to remove the
channel from the display.
H Press the front-panel Vertical button that corresponds to the channel
you are to confirm.
H Move the leveled output of the sine wave generator to the channel
you selected.
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