Performance Tests
CSA7404B, TDS7704B, TDS7404B, TDS7254B & TDS7154B Service Manual
4-69
1. Install the test hookup and preset the instrument controls:
a. Hook up the test-signal source:
H Set the output of a DC calibration generator to off or 0 volts.
H Connect the output of a DC calibration generator through a
dual-banana connector followed by a 50 Ω precision coaxial cable to
one side of a BNC T connector. See Figure 4--11.
H Connect the Sense input of the generator through a second dual-ba-
nana connector followed by a 50 Ω precision coaxial cable to the
other side of the BNC T connector. Now connect the BNC T
connector to CH 1 through an adapter. See Figure 4--11.
Instrument under test
DC calibrator
50 Ω Coaxial cables
Dual banana to
BNC adapters
BNC T
connector
Output Sense
Figure 4- 11: Initial test hookup
b. Initialize the instrument: Press DEFAULT SETUP.
c. Modify the default settings:
H From the tool bar, touch Horiz and select the Acquisition tab.
H Touch Average and set the number of averages to 16.
2. Confirm input channels are within limits for offset accuracy.Dothe
following substeps — test CH 1 first, skipping substep 2a since CH 1 is
already selected 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.
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