PXIe Platform Bit Error Rate Tester
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BERTPXIe-1003/1005
Coherent Solutions Ltd.
Version
1.00
37
increase or decrease the value.
8.3.6
Inject errors
For each channel, you can inject a burst of errors to test the functionality of the error detector
circuitry.
To inject errors, click the INJECT ERROR button.
Each time the button is clicked, the pattern being generated by the pattern generator inverts
its polarity temporarily to force errors in the error detector.
8.3.7
Specify the result display type
For the BER measurement, you can choose to display either the accumulated BER information
or the instantaneous BER information:
•
Accumulated BER indicates that the BER value is calculated from the beginning of the
measurement. The BER value is equal to the ratio between the error counter and the
bit counter since the beginning of the measurement.
•
Instantaneous BER indicates that the BER value is calculated from the last point of the
data reading. The BER value is equal to the ratio between the error counter and the bit
counter since the last point of reading. The counters are reset after each reading.
To specify the result display type, click the RESULT DISPLAY drop-down list box and then
select an appropriate value, as illustrated below:
8.3.8
Eye scan
The eye scan is used for diagnostic testing and validation. The horizontal axis of the eye
represents the clock phase alignment of the error detector to the received bit and the vertical
axis represents the decision threshold voltage level, also referred to as the slicer level. At each
point on this two-dimensional matrix of clock phase alignment and slicer level, the counted bit
error rate is represented by the logarithmic color map.
The bit error rate tester (BERT) eye scan is different from the traditional oscilloscope eye
pattern mainly in sampling rate. A BERT samples all bits as they come by during the testing,
