Gentec-EO MACH 6 - Manual (Page 13)

Mach 6 User’s Manual Revision 2.1 13
Read 2, pulse offset = 500,001, number of pulses to retrieve = 500,000
Read 3, pulse offset = 1,000,001, number of pulses to retrieve = 500,000
Read 4, pulse offset = 1,500,001, number of pulses to retrieve = 500,000
The response of the application to large pulse batches will depend on the host PC. A test
machine with a 2.66GHz dual core processor and 3GB of memory retrieved 500,000
pulses to a data file in 7.9 seconds. The retrieval to the display took 20.9 seconds. The
extra time is due to the processing of the large data arrays in the application.
Batch Size
The number of pulses to measure when the instrument is armed.
Missing Pulse Threshold
The energy level used to test a data set for missing pulses. Any pulse energy in the set
that is lower than this threshold will cause a missing pulse to be recorded. This control
must be set before testing the data.
% Frequency Stability Threshold
With internal triggering, if the pulse is below the trigger level, no trigger will occur, but
the period timer will still be running. This means that the period will be longer between
the pulses adjacent to the missing pulses. The applications software examines the pulse
data for this condition and records the time stamps where the period is discontinuous.
From the continuous period data, the true period can be found and used to count how
many pulses were missing in the discontinuities.
The % Frequency Stability Threshold setting determines how much time stamp mismatch
is allowed before a pulse is determined to be missing.
This control must be set before the data set is tested.
Search Data For Missing Pulses
Searches the current data set for missing pulses. Pulse data are searched using to criteria,
the Missing Pulse Threshold and the Frequency Stability Threshold.
A large data set can take many seconds to search.
Missing Pulse Threshold
The energy level used to test a data set for missing pulses. Any pulse energy in the set
that is lower than this threshold will cause a missing pulse to be recorded.
Frequency Stability Threshold