Detailed Command Descriptions
Programming Reference
E1852B Operating Guide
129
FETCH Subsystem
FETCH:BER?
Query Bit Error Rate continuously
FETCH:NACK?
Query NACK Count continuously (Packet Error Rate)
Syntax:
FETCH:BER?
Value Range:
<value>
Number of bits transferred
Default Value:
Not Applicable
<value>
Number of erroneous bits
detected
<value>
BER [%]
Applicable in
State:
Query: TCONN
Description:
This query is used to continuously measure the Bit Error values of
the DUT. The data is returned prior to the completion of the
measurement and so is only an indication of the BER.
Note that this is only applicable in loopback test mode.
Example:
FETCH:BER?
Syntax:
FETCH:NACK?
Value Range:
<value>
Number of packets
transmitted
Default Value:
Not Applicable
<value>
Number of erroneous packets
detected
<value>
NACK count [%]
Applicable in
State:
Query: CONN, TCONN
Description:
This query is used to continuously measure the Packet Error Rate
values of the DUT. The data is returned prior to the completion of
the measurement and so is only an indication of the BER. Use the
READ:NACK?
command for the true measurement.
Example:
FETCH:NACK?
E1852-90007.book Page 129 Monday, February 4, 2002 2:09 PM
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