Performance Tests
CSA7404B, TDS7704B, TDS7404B, TDS7254B & TDS7154B Service Manual
4- 133
NOTE. To optimize performance, make sure that all connections are clean and
secure and that all components of the system are in good condition. Optical fiber
can gradually degrade the system performance as it is repeatedly flexed over
time.
Equipment
required
Optical impulser (item 28)
Tektronix OA5022 variable optical at tenuator (item 30)
Multimode fiber-optic cable, 2 m, FC to FC connectors (item 34)
Optical attenuat or, 10 dB, FC-FC, female-male connectors (it em 35)
O/E Electrical Out-to-CH 1 Input adapter (Item 32)
Prerequisites See page 4--17
Before performing this procedure, be sure you have completed the Optical Noise
procedure on page 4--127.
Install the test hookup and preset the controls:
1. Install the test hookup as shown in Figure 4--44.
2. Start with about 30 dB of attenuation on the variable attenuator.
NOTE. To avoid dispersing the narrow optical impulse signal, keep all fiber
lengths as short as possible. Lengths that ar e 2 to 3 meters long ar e acceptable.
3. Initialize the instrument: Press the DEFAULT SETUP button.
4. From the tool bar, touch Horiz and select the Acquisition tab.
5. Select the Average acquisition mode. Set the number of averages to 64.
Touch the Equivalent Time ET button.
Setup
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