System information

Blastware Compliance Module
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4–24 Blastware Operator Manual
iii Histogram Record Mode (Strip Chart)
Use the Histogram Record Mode for long-term recording periods such as monitoring of pile
driving operations.
In Histogram Record Mode, the monitor stores summary information in intervals. The monitor
continues to sample data continuously at the chosen sample rate but only stores the relevant peaks
for the interval. This reduces the data recorded and greatly increases the monitors storage capacity.
For each interval, the monitor calculates the maximum peaks, the frequency of the largest peak,
and the peak vector sum. For each channel, the maximum peak and its frequency are calculated.
Also the largest peak vector sum is calculated over the entire Event. Histogram Record Mode
displays the peak of each interval in a bar chart, while tabular format represents the peaks as
numbers.
iv Histogram Combo Mode
The Histogram Combo Mode creates a waveform recording during a Histogram recording if the
signal exceeds the waveform trigger level. The waveform Event is saved as a separate file while
the Histogram Event file remains continuous, only limited by the amount of available memory.
The auxiliary trigger is automatically disabled during Histogram Combo Mode.
The maximum sample rates in this mode are 1024, 2048, and 4096.
(2) Record Stop Mode
The Record Stop Mode sets how the monitor stops recording after being triggered. Select a Record
Stop Mode if you are using Waveform or Histogram Combo Record Modes. You can choose
between a Fixed Record Time setting or an Auto Record setting. Fixed Record Time sets the
record time to a specified length. Once the record time has elapsed, the monitor stops recording. In
Auto Record, unlike the Fixed Record Time, the monitor continues to record Event activity as
long as that activity remains above the trigger level (sufficient memory and battery power must be
available). Recording stops a specified period of time after the Event activity falls below the
trigger level. Use the Auto Record mode if you are unsure of the actual Event duration.
To Select a Record Stop Mode, position the mouse pointer on the Record Stop Mode drop–down
menu and click the mouse button. Choose Fixed Record Time or Auto Record.
(3) Sample Rate
The monitor has three sample rates; standard (1024 samples per second), fast (2048 samples per
second), and faster (4096 samples per second on channels 1 to 4 only). The choice of a sample rate
depends on the type of monitoring you are conducting. Increasing the sample rate increases the
accuracy of the waveform recording. For this reason, set the sample rate according to the location
of the standard transducer or the Micromate. For close-in or near field monitoring, set the sample
rate to 4096 samples per second. For far-field monitoring, set the sample rate to 1024 samples per
second. Increasing the sample rate also increases the amount of memory required to store Events
and reduces the number of Events that can be stored on the monitor. It also reduces the battery life.
To choose a recording rate, click on the Sample Rate drop–down menu. Click the mouse pointer
on the required sample rate. The maximum sample rates in this mode are 1024, 2048, and 4096.
(4) Record Time
This setting changes between record times depending on the Record Stop Mode chosen above. If
you chose Fixed Record Time, enter a time in seconds in the Record Time box.
(5) Histogram Interval
Set the Histogram Interval if Histogram or Histogram Combo Record Mode was chosen. The
Histogram Interval is the period of time the monitor records Event information before applying the
data analysis techniques. For each interval, the monitor calculates the maximum positive or
negative peaks, the frequency of the largest peak, and one peak vector sum. For each channel the
maximum peak and its frequency are displayed in the summary data. The maximum peak vector