Measurement Computing eZ-Analyst rev.14.1 - Manual (Page 42)

4-6 Edit Menu 978791 eZ-Analyst
Maximum Pre-trigger Percentages for 640 and 650 Series Devices
This section consists of 5 tables for users of IOtech 640 or 650 series devices who want to know the maximum pre-trigger
percentage for the configured number of input channels, spectral lines and the analysis frequency. To determine the
percentage:
1) Go to the table for the number of input channels being used.
2) Select the row that matches the number of spectral lines.
3) Look down the column that matches the selected analysis frequency.
4) The result (where row and column intersect) is the maximum pre-trigger percentage.
Example: with 1 channel, 500Hz, and 12800 spectral lines we have a maximum pre-trigger percentage of 47% .
For 1 Channel
Frequency
20Hz 50Hz 100Hz 200Hz 500Hz 1kHz 2kHz 5kHz 10kHz 20kHz 40kHz
Spectral
Lines
25600 1 5 5 23 23 95 95 99 99 99 99
12800 2 11 11 47 47 99 99 99 99 99 99
6400 5 23 23 94 99 99 99 99 99 99 99
3200 12 47 47 99 99 99 99 99 99 99 99
1600 22 91 99 99 99 99 99 99 99 99 99
800 45 99 99 99 99 99 99 99 99 99 99
400 90 99 99 99 99 99 99 99 99 99 99
200 99 99 99 99 99 99 99 99 99 99 99
100 99 99 99 99 99 99 99 99 99 99 99
50 99 99 99 99 99 99 99 99 99 99 99
For 2 Channels
Frequency
20Hz 50Hz 100Hz 200Hz 500Hz 1kHz 2kHz 5kHz 10kHz 20kHz 40kHz
Spectral
Lines
25600 1 5 5 21 21 87 87 99 99 99 99
12800 2 10 10 43 43 99 99 99 99 99 99
6400 5 21 21 87 87 99 99 99 99 99 99
3200 10 43 43 99 99 99 99 99 99 99 99
1600 20 86 86 99 99 99 99 99 99 99 99
800 41 99 99 99 99 99 99 99 99 99 99
400 83 99 99 99 99 99 99 99 99 99 99
200 99 99 99 99 99 99 99 99 99 99 99
100 99 99 99 99 99 99 99 99 99 99 99
50 99 99 99 99 99 99 99 99 99 99 99