OPERATIONS
Operating the TE Controller from the Front Panel
7/01 LDC-3700 Series 29
CHAPTER 2
Automatic Shut Off Conditions for TEC Output
The following conditions will automatically cause the instrument to disable the TEC output:
• High Temperature Limit
• Connecting pins 13 and 15 on the TEC connector (external/booster temperature limit
switch)
• Booster Changed (while Output is enabled), (see Chapter 5)
• Sensor Open (while Output is enabled)
• TEC Module Open (while Output is enabled)
• SENSOR SELECT Switch Moved (while Output is enabled)
• Sensor Shorted (while Output is enabled)
• TEC mode changed (while output is enabled)
TEC Error Indicators
The LDC−3700B Series Laser Diode TEC Controllers indicate general TEC operational error
conditions. Each error condition results in a controller action as shown in the following table.
Table 2.3 TEC Error Indicators
Error Condition Action
Temperature limit TEMP LIMIT light flashes at 1 Hz
Open sensor Output off, SENSOR OPEN indicator LED flashes at 1 Hz
TE Current limit TE CURRENT LIMIT light flashes at 1 Hz
TE Module Open TE MODULE OPEN indicator LED flashes at 1 Hz (not in effect
when booster source is used)
TE Compliance Voltage Limit TE CURRENT LIMIT light flashes at 2 Hz
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