EDI CTT-2 Betriebshandbuch - Seite 2

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1 Introduction

The CTT-2 is a computer controlled transducer test set designed for production line testing of

sonar transducers during manufacture. Swept frequency tests are quickly performed. The data

returned can be impedance and relative phase for each point in the sweep, or just the minimum

and maximum impedance points found over the swept frequency range. Leakage tests can also

be made over a range of 100 ohms to over 10 megohms.

1.1

Preliminary setup and test

Connect a terminal to the CTT-2. Set the terminal for a Baud rate of 9600, 8 data bits, 1 stop

bit, no parity, and no handshake. The supplied terminal program, DSTS_terminal.exe, is

preset to these values. Connect the power supply to the CTT-2. The three front panel LED's

will flash briefly, indicating the CTT-2 is ready to operate.

1.2

Read the power supply voltage

Type 'Cv' followed by the enter key. This is the command to read the power supply voltage.

Note that the commands are case sensitive. The power supply voltage returned should be

between 9 and 16 volts.

1.3

Impedance check

Connect a 510 ohm resistor to the TRANSDUCER connector and type 'f100000' followed by

enter. The frequency and resistance will be returned. The returned value should be within 5%

of the resistors value. This completes the preliminary test of the CTT-2's operation.

2 Sweep testing

For sweep testing a transducer, the frequency step and the number of steps are selected to cover

the desired range of frequencies. The sweep is started by typing the sweep command and the

starting frequency for the test. The type of data returned is selected by the second character of

the sweep command. The quickest sweep test returns just the maximum and minimum

impedance points that occurred over the frequency range. For more detail, the sweep can

return the impedance at each frequency step; but this takes more time because of the large

amount of data returned.

2.1

Before starting the frequency sweep, the sweep parameters must be set. There are

three parameters: the frequency step, the number of steps, and the dwell at each step.

2.1.1

value of 100Hz is a good choice between speed and accuracy for most transducers.

2.1.2

to complete. With dual frequency transducers, it is better to divide the sweep into two

narrower ranges than to sweep the entire range. The reason for this is to increase the test

speed by limiting the number of frequency steps.

CTT-2 Manual V1.01

The frequency step is the amount the frequency will increase at each step. A

The number of steps set the range of the sweep. More steps require more time