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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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LDTC-LAB Datenblatt(PDF) 23 Page - Wavelength Electronics, Inc. |
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LDTC-LAB Datenblatt(HTML) 23 Page - Wavelength Electronics, Inc. |
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23 / 31 page  23 TROUBLESHOOTING PROBLEM POTENTIAL CAUSES SOLUTIONS The LDD output switched off unexpectedly OR I can't enable LDD output current The output disabled due to an interlock. Check error messages on screen or with ERR? query Fix appropriate interlock or follow instructions on Error Messages Page. TC failure detected. If the TC output also disabled, resolve the source of that error. If LDD output was remotely linked to the TC status, but you don't want it to be linked, use LASer:ENABle:OUTOFF command to unlink them. Temperature limits have been reached. If the temperature limits can be increased without damage, increase the temperature limit settings. The TC output switched off unexpectedly OR I can't enable TC output current. Check error messages on screen or with ERR? query, OR TC failure was detected. The instrument detected an error. Follow instructions on Error Messages Page. Temperature limits have been reached. If the temperature limits can be increased without damage, increase the temperature limit settings. The instrument is on but the front panel display is blank. Instrument firmware is being downloaded from USB port. Wait patiently until the firmware has finished updating. The screen brightness is too low. While the screen may appear off, the brightness is at a low setting. Go to the settings screen to raise the brightness or send remote command (BRIGHT) to increase brightness. If you can't see the screen because it is too dark and don't want to easily use the remote command, imagine the location of the icons on the screen. Good luck. LD noise current is higher than expected. Ground Loop, bad connections and solder joints, noisy computer connections, etc. Refer to AN-LD09 Troubleshooting Low Noise Systems. Actual LD current does not match the setpoint. The setpoint exceeds the limit current setting. If the limit current can be increased without damage to the laser, increase the limit current setting. The laser is compliance voltage limited. If the limit voltage can be increased without damage to the laser, increase the limit voltage setting. See Additional Technical Information for more details. Temperature does not stabilize very well at setpoint. Poor thermal contact between components of the thermal load. Use thermal paste or washers between the load/TEC and TEC/heatsink interfaces. Make sure the temperature sensor is in good thermal contact with the load. Operating outside of the ideal region of the temperature sensor. The sensor type and bias current should be selectedtomaximizesensitivityatthetarget temperature. Thermistors provide the best performance, particularly for applications where a single setpoint temperature must be accurately maintained. For example, at 25°C a 10 kΩ thermistor has a sensitivity of 43 mV/°C, whereas an RTD sensor has a sensitivity of 4 mV/°C. Proportional control term is set too high. Run an IntelliTune scan. Derivative term is introducing noise. Run an IntelliTune scan. Sensor bias current was changed while instrument was in Manual IntelliTune mode. In Manual mode, IntelliTune changes are not made when bias current or setpoint is changed. Change to either SR or DR mode for IntelliTune to update. |
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