T3D User Manual
030705
T3D User’
s Manual
Front panel controls and connectors
Power:
Turns the T3D on.
Function:
Selects various modes of operation when
held down. Also used to initiate calibration
sequence.
Sensitivity -:
Reduces the sensitivity to the transducer’
s
resonant points. Also used with Function
button to turn unit off.
Sensi: Increases the sensitivity to the transducer’
s
resonant points. Additionally used to
display temperature in degrees Fahrenheit
when in the temperature test mode.
Multi-function:
Used to test transducers with combined
depth-temperature-speed functions.
Standard:
Use to connect to piezoelectric transducers
in the 50 to 500 kHz range.
Quick start
Connect the T3D to a piezoelectric transducer and turn it on by pressing the
power
button. The
bar graph will show one or more illuminated sections corresponding to the resonant points of the
transducer. If no lights come on, the transducer element is bad. The T3D will turn off after two
minutes of operation. It can also be turned off by pressing both the
function
and
-sensitivity
buttons.
Other tests
Multifunction transducers may be tested for correct operation of the thermistor and the speed
paddle wheel by connecting them to the 8-pin
multi-function
connector. The 8-pin connector
wiring is configured for the most popular multi-function transducers and is detailed at the end of
this manual.
Leakage
The leakage test is activated by holding the
function
button down until the segment next to
leak
flashes. An open circuit (> 10 meg ohms) will cause all segments to light. A short (<10 ohms)
will light only the segment next to
0
.
Temperature
Again press and hold the
function
button until the segment next to
temp
blinks. The first digit of
the temperature is indicated by the flashing segment and the second digit by a steady segment.
The readout is in degrees centigrade unless the
E
F
button is held down for a Fahrenheit reading.
Speed
