EDI DSTS-5A Manuel de l'utilisateur - Page 9
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6 CALIBRATING THE DSTS-5A
6.1 The load resistor can change if overheated by too much power. A large change in the
resistance will cause the voltage and reply readings on a depth sounder to change. The
load resistor should be checked any time abnormal readings are experienced.
6.1.1 Check the load resistance with the DSTS-5A power off. Place an ohmmeter
across the IN/OUT connector. The resistance for the factory installed load should
be 582 ohms +/- 10%. The resistance of a custom load at the IN/OUT connector
should read 22 ohms higher than the value of the installed load resistor. If the load
is out of spec, the unit should be taken apart and the load resistor replaced before
any further calibration or checks are done.
6.1.2 Run the supplied terminal program, DSTS_terminal.exe.
6.1.3 VOLTMETER CALIBRATION
Caution—Do not perform this procedure without a EDI DSTS calibrator
or other comparable pulse source.
6.1.3.1 The volt meter calibration is in the "extended menu". Type 't' to enter the
extended menu. Then type 'c' to start the voltmeter calibration routine. Connect
the EDI DSTS calibrator or other comparable pulse source to the IN/OUT
connector. After the indicated voltage readings have settled down, type in the
correct input pulse voltage in volts peak-to-peak and press 'enter'. A calibration
factor will be generated and stored in eeprom. Press the reset button and check
that the voltage reads correctly. If not, repeat the calibration.
6.1.4 FREQUENCY CHECK
Connect the DSTS-5A to a frequency counter and press the reset button. Set the
output to continuous by typing 'B' followed by 'enter'. Set output level to
maximum by typing l255. Set the frequency to 100 KHz by typing f10000 followed
by 'enter'. The frequency counter must read 100,000Hz +/- 10 Hz.
6.1.5 REPLY AMPLITUDE CHECK
6.1.5.1 Connect a scope (1 megohm input required) directly to the IN/OUT
connector with a short (< 3ft) cable. Set the frequency to 100 KHz (f10000) and
the level to maximum (l255). The voltage must read 140 mV p-p +/- 7 mV p-p.
This is a fixed factory setting and will not change unless the DSTS-5A has been
damaged by a severe overload.
6.1.6 OPTIONAL REPLY ATTENUATOR CHECK
6.1.6.1 Connect the DSTS-5A IN/OUT connector to a spectrum analyzer. Set
various levels to make sure the attenuator tracks properly. Note that the output
on the analyzer will be low because the 50 ohm input impedance of the
spectrum analyzer loads down the DSTS-5A output. If a high impedance
(>=100,000 ohm) probe is available, the readings will be correct and a level of
1 The EDI DSTS Calibrator produces a 400 volt p-p pulse burst with a frequency of 204.8 KHz, length of 325 uSec,
and a period of 80 mSec. Droop is less than 10 percent.
DSTS-5A Manual
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Rev 140930-300