Tektronix SD-42, User Manual

Page: 26 / 48

Performance Check
SD-42 & SD-46 User Manual
3–3
Optical Power Monitor Check
The Optical Power Monitor function of the SD-42/SD-46 does not use any of the
oscilloscope functions. However the oscilloscope must be switched on and the
electrical output of the SD-42/SD-46 must be terminated, preferably using the
high-performance U-link connected to an adjacent SD-24/26.
WARNING. Avoid eye exposure to the output of open-ended fibers/connectors.
Ensure all fibers are terminated prior to turning on an optical source.
1. Connect the equipment as shown in Figure 3–1.
OA5002
Optical Cable
Laser DVM
CSA 803
SD-42/SD-46 SD-22/SD-26
Optical
Input
Rigid
U-link
+ —
Out In Out
Figure 3–1: Setup to Check Optical Power Monitor Operation
2. Switch on the CW laser source.
3. Set the digital voltmeter as follows:
DC Volts
Autoranging (or 200 mV)
4. On the SD-42/SD-46, using SELECT RANGE, set the range to 1 V/mW.
5. Adjust the optical attenuator until the digital multimeter reads 100 mV.
There is now 100
m
W of power incident on the SD-42/SD-46 input.
6. Increase the setting of the optical attenuator by 30 dB.