LeCroy DDA 7 Zi series, Руководство оператора

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WavePro 7Zi
373
WP700Zi-OM-E-RevA
The mask properties are defined by the file “PulseMasksProp.mdb” in the “D:\Masks” directory. This Microsoft
Access 2000 file is shown here:
This file contains mask tables that give the coordinates of each mask, and a table named
“TelecomStandardsProps” that contains all of the information defining the test and how each mask is to be used.
The fields in this table are defined as follows:
ID - An index that is automatically generated. Do not enter a value in this field.
Old - For internal use only; leave blank.
Standard - The name of the standard to which the selected mask is associated
Legacy Standard - Optional; not used for user defined standards
Symbol - Defined mode within standard (pos, neg, one, zero, transmit, receive)
Bit rate - Bit rate of signal; defines period.
Required Bandwidth - Minimum bandwidth needed to accurately test signal.
Minimum Sample Rate - Minimum sample rate needed to accurately test signal.
Probe - Required probe or adapter; left blank if none.
Type - Defines the type of signal and how it will be aligned and tested. The choices are:
x
Absolute
x
Ab Offset
x
Relative
x
Relative Peak
Coding - Type of coding (CMI code mark inversion, AMI alternate mark inversion, etc.); used for information only.
Pattern Isolation - Bit pattern used to isolate the pulse under test. Syntax: bbbb/pp/aaa where bbbb is the
symbol values before the desired pattern and aaa is the value of the bits after the desired pattern. For example,
an isolated “one” would look like: 00/1/00. Bipolar pulses are defined as 1 and -1; and CMI is handled as two bits
per unit interval. A CMI 0, for example, would look like: 1/01/0.
V div - The vertical scale required for nominal amplitude in the mask. This voltage is adjusted for relative masks.
Nom Ampl - The nominal amplitude of the pulse to be tested.
T div - Horizontal scale to have signal in mask.