Warranted characteristics tests
The following procedures in this section verify the LE160/LE320 performance is
within the warranted specifications.
Photocopy the test record at the end of this document and use it to record the
performance test results.
Warm up information
Before continuing with this procedure ensure that all equipment has had a 20-
minute warm-up period.
Check the skew between
DP and DN
This check verifies the skew between the DP and DN meets the published
specifications. Record the measurement results in the appropriate section in the
Test Record. (See
on page 15.)
1.
2.
Set the pattern generator to output a 1010 pattern.
3.
Enable the desired test channel on the linear equalizer and set the
Output
Amplitude
control to 800 mV
P-P
.
4.
Check the Channel 1 skew between DP and DN:
a.
Measure the positive crossing point on channel 1 of the oscilloscope.
Record the value in "Scope Ch 1 measurement", row A in the Test
Record.
b.
Measure the negative crossing point on channel 2 of the oscilloscope.
Record the value in "Scope Ch 2 measurement", row B in the Test
Record.
c.
Subtract the value from row A minus row B and enter in row C in the
Test Record.
d.
Reverse the oscilloscope input cables at the output of the linear equalizer.
Oscilloscope Channel 1 should now be connected to the Ch 1 - output of
the linear equalizer and oscilloscope Channel 2 should be connected to
the Ch 1 + output of the linear equalizer.
e.
Measure the negative crossing point on channel 1 of the oscilloscope.
Record the value in "Scope Ch 1 measurement", row D in the Test
Record.
f.
Measure the positive crossing point on channel 2 of the oscilloscope.
Record the value in "Scope Ch 2 measurement", row E in the Test
Record.
g.
Calculate the difference between the measurements in row D minus row
E. Record the difference in row F in the Test Record.
h.
Calculate the difference between the entries in row C minus row F.
Divide that result by 2. Enter the divided value in row G.
Performance verification
12
LE160 & LE320 Specifications & Performance Verification
Summary of Contents for LE160
Page 4: ......
Page 6: ...Table of Contents ii LE160 LE320 Specifications Performance Verification ...
Page 14: ...Compliance Information x LE160 LE320 Specifications Performance Verification ...
Page 16: ...Preface 2 LE160 LE320 Specifications Performance Verification ...
Page 28: ...Performance verification 14 LE160 LE320 Specifications Performance Verification ...
Page 30: ...Test record 16 LE160 LE320 Specifications Performance Verification ...