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System Operation
ERROR LED
ON
OFF
OFF
4.3.5
LASER DIODE Display Section
The lower-left quadrant of the Model 6100 front panel has a 5 digit green
LED array. The table below shows the displayed value and the state of units
LEDs based on the LDD mode of operation.
Mode
Constant Laser diode
Current
Constant Photodiode
Current
Constant Photodiode
Power
4.3.6
TEC OUTPUT ON Switch and Indicator
The switch will activate the ON LED and allow current flow to the TEC.
Current will not flow unless the TEC is correctly connected and the interlock
pins (pin 3 & 4 of the TEC output connector) are not connected one to each
other. This is the default behavior. The user can change this state to opposite,
and direct the TEC to not turn the output on, unless the interlock pins are
connected together, by reprogramming the Interlock Monitor (see
HWCONFIG command in Section 5.5).
4.3.7
TEC ERROR Indicator LED
The following conditions will cause the red ERROR LED and its protection
circuitry to activate, automatically shutting off the output:
High/Low Temperature Limit (Constant temperature and current modes only)
High/Low Resistance/Reference Limit (Constant resistance/reference mode
only))
TEC Open
Sensor Open
LIMIT LED CONDITION
ON
BLINKING
OFF
Table 2
Laser Diode Error and Limit LED Status Definition
Displayed Value
Actual output current
Actual photodiode
current
Actual power
((Internal temperature exceeds 80
(Rear panel Interlock de-asserted) OR
(Hard current limit condition asserted))
Soft limit condition asserted by circuitry
No error condition detected
"mW" LED
OFF
OFF
ON
41
o
C) OR
"mA" LED
ON
OFF
OFF
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