Performance Verification
OI1125 E/O Transmitter Instruction Manual
43
Data crossing point
location with BERT
adjust turned off.
Data crossing point
location shifts upward
with BERT adjust
enabled and turned
fully clockwise.
Figure 16: Using an eye pattern to check modulator polarity
Take Measurements.
The equipment is now set up for recording the test results in
Table 17 in the Test Record.
1. Verify that the Data Crossing Point Adjust on the BERT is turned off.
2. Verify that the eye pattern is vertically centered approximately around zero
(about a 50% duty cycle).
3. Turn on the Data Crossing Point Adjust on the BERT.
4. Turn the Data Crossing Point Adjust on the BERT to the fully clockwise
position (maximum).
The crossing point of the eye pattern will shift upward if the modulator
polarity is noninverting. This is a pass condition for the test. Record the
result in Table 17 in the Test Record.
You have now completed Table 17 in the Test Record. The remainder of Table 17
lists the specification limits for the remaining tests in these performance
verification procedures. Use the limits as a reference when filling out Tables 19
through 21 in the Test Record.
Summary of Contents for OI1125
Page 4: ......
Page 8: ...Table of Contents iv OI1125 E O Transmitter Instruction Manual...
Page 20: ...Getting Started 8 OI1125 E O Transmitter Instruction Manual...
Page 30: ...Operating Basics 18 OI1125 E O Transmitter Instruction Manual...
Page 36: ...Specifications 24 OI1125 E O Transmitter Instruction Manual...
Page 38: ......
Page 42: ...Theory of Operation 30 OI1125 E O Transmitter Instruction Manual...
Page 72: ...Performance Verification 60 OI1125 E O Transmitter Instruction Manual...