New Focus 1480, User Manual, Page: 9 / 20

15-GHz & 25-GHz Photodetectors Operation • 9
4.
Check the battery level as described above.
Making the Microwave Connection
1.
Connect the photoreceiver module’s microwave
connector to a test instrument that has a 50-
Ω
input, such as an oscilloscope or spectrum ana-
lyzer, or to another 50-
Ω
load. If necessary, use a
high-frequency cable (best performance is
achieved without a cable).
2.
To avoid connector damage and signal distortion,
be sure that the cable and the instrument you
intend to connect to the module have compatible
connectors. See “Appendix I: Microwave
Connectors” on page 19 for a list of compatible
connectors.
Connecting the Detector to the Optical Input
1.
Measure the peak power in the fiber prior to con-
nection to the module to be sure it is within the
safe operating range (see “Photodetector Charac-
teristics” on page 11).
2.
Connect the fiber-optic cable to the fiber-optic
input on the detector module. If needed, the Bias
Monitor may be used to optimize coupling to the
fiber.
1480 FC Det revA.fm Page 9 Monday, March 13, 2000 2:55 PM