Measuring the time between each ping
The time between each ping (sometimes referred to as the pulse repetition frequency (PRF)) must be verified for different range settings. Longer ranges will increase the time between each ping.
Prerequisites
The MS70 is switched on and working in normal operational mode. Neither tools nor instruments are required.
Context
You can measure the time between pings by setting the horizontal axis in the Echogram view to a defined number of pings, and measure the time it takes to "fill" the echogram. The horizontal scale controls how "fast" the echograms move from right towards left across the MS70 presentation. You can change the horizontal scale on the Horizontal Axis page in the Echogram dialog box.
The following requirement must be met:
•  Time between pings are recorded in the result table.
•  50 meters range: < 400 mS
•  500 meters range: < 1670 mS
Procedure
1 On the Main menu, set Beam Mode to Example 1 Sector Uniform Weighting.
2 Select the Operation icon.
The icon is located under the Main menu. It is used to open the Operation menu. Choose these settings:
a Set Operation to Normal.
b Set Range to: 50 m.
c Set Ping to On.
d Set Ping Mode to Maximum.
e Set TX Mode to Active
f Set TX Power to Maximum.
3 Observe the average pulse repetition frequency.
a Press the Shift key, and double-click the Simrad logo on the MS70 top bar.
Observe that the Object Inspector dialog box opens.
b Open the Acoustic Device Synchronizer.
c Observe the mean value of the ping intervals.
d Set Range to: 500 m.
e Observe the average pulse repetition frequency with the new range.
4 Set Range to: 500 m.
5 Measure the time between ping with the data recording switched off.
Result
Range Record Results
50 m On  
500 m On  
500 m Off  
Test procedure Results
Measuring the time between each ping  
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