Performance Tests
4-60
TDS7104 & TDS7054 Service Manual
c. Check REF OUT output against limits: CHECK that the CH 1 High
readout is ≥1.0 volt and that the CH 1 Low readout ≤0.25 volts. Enter
the measurements on the test record.
6. Disconnect the hookup: Disconnect the cable from the oscilloscope.
TDS7000 oscilloscope
50 Ω coaxial cable
Output
Sine-wave
generator
Figure 4- 26: Initial test hookup for external reference
7. Install the test hookup and preset the instrument controls:
a. Initialize the oscilloscope: Press the DEFAULT SETUP button.
b. Hook up the test-signal source: Connect, through a 50 Ω precision
coaxial cable, the output of the sine wave generator to CH 1 input (see
Figure 4--26).
H From the button bar, touch MEAS and select the Ampl tab.
H Touch the Pk-Pk button.
H Touch the Close button.
H Set the Vertical SCALE to 50 mV.
H Set the generator for a 10.0 MHz sine wave.
H Set the generator to output a 4 division signal. Adjust the output
until the Pk-Pk readout displays 200 mV.
c. Set the oscilloscope controls:
H Move the cable from the CH 1 input to the rear-panel Ext Ref input
(see Figure 4--27).
H Touch Menu to select menu mode.
H Touch Utilities and select External Signals.
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