Performance Tests
CSA7404B, TDS7704B, TDS7404B, TDS7254B & TDS7154B Service Manual
4- 127
Equipment
required
Fiber-optic dust cap (Item 38)
O/E electrical out-to-CH1 input adapter (Item 32)
Prerequisites See page 4--17. Also, the instrument must have passed Check DC
Voltage Measurement Accuracy on page 4--45.
This procedure checks the optical-to-electrical noise. The check is made with
vertical offset set to zero and no optical signal input (dust cap installed on the
OPTICAL INPUT).
1. Install the test hookup and preset the instrument controls (See Figure 4--42):
O/E Electrical
Out-to-CH1
input adapter
Dust cap
CSA7000B Instrument
Figure 4- 42: Initial test hookup
a. Install the fibre-optic dust cap onto the OPTICAL INPUT connector of
the O/E converter.
b. Install the O/E Electrical Out-to-CH 1 Input adapter on the CSA Instru-
ment.
c. Press the DEFAULT SETUP button.
d. Select CH1 for the waveform source.
e. From the tool bar, touch the Vert button and select the CH1 tab.
f. Set the Scale to 50 W/div
g. Set Position to 0.0div.
h. Set Channel Offset to 0.0W.
i. From the tool bar, touch the Horiz button and select the Horizontal tab.
j. Set the Scale to 20 ns/div.
Check Maximum
Optical-to-Electrical Noise
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