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Performance Tests

4- 130

CSA7404B, TDS7704B, TDS7404B, TDS7254B & TDS7154B Service Manual

H Move the optical fiber from the optical power meter to the optical

input of the CSA Instrument.

b. Initialize the instrument: Press the DE FAULT SETUP button.

c. Modify the initialized front-panel control settings:

H From the tool bar, touch Meas and select the Ampl tab.

H Touch Mean.

H From the tool bar, touch Horiz and select the Acquisition tab.

H Touch Average and set the number of averages to 64.

H Touch the Close button.

H Set the Vertical SCAL E to 20 mV per division.

H Set the Horizontal SCALE to 200 s.

Table 4- 15: O/E gain

Wavelength setting

Vertical scale

setting

Attenuator output

setting

Accuracy limits

780 nm 20 mV 0.1 mW (--10 dBm) ≥27 mV

850 nm 20 mV 0.1 mW (--10 dBm) ≥33 mV

1310 nm 50 mV 0.1 mW (--10 dBm ) ≥64 mV

1550 nm 50 mV 0.1 mW (--10 dBm ) ≥64 mV

2. Confirm O/E Gain is w ithin limits: Do the following substeps — test the

first wavelength setting in Table 4--15 first, skipping substep a since 780 nm

is already selected from step 1.

a. Select and unchecked wavelength from Table 4--15.

H Move the optical fiber from optical input of the the CSA Instrument

to the optical power meter.

H Set the CW laser source to wavelength not yet checked from

Table 4--15.

H Set the Vertical SCAL E to the setting in Table 4--15 for the selected

wavelength.

H Set the multimode optical attenuator for 0.1 mW out of the optical

power meter.

Tektronix CSA7404B Service Manual

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