OPERATION
Save and Recall Parameter Functions
10_15 LDC-3900 Series 31
CHAPTER 2
Modulation Section
The THROUGH TO REAR (BNC) connector allows a DC to 500 kHz (high
bandwidth) or DC to
10 kHz (low bandwidth) modulation signal to be applied to the laser. The
bandwidth specification is measured with a 1 load. The modulation port input
impedance is 0.5 . For convenience, the THROUGH TO REAR connection
allows the modulation signal to be connected via the front panel, sent through to
the back panel, and routed to a Laser module via a jumper cable. The transfer
ratio of the modulation control signal varies with module model, refer to the Laser
module instruction manual.
Figure 2.24 LDC-3900 MODULATION Section
Save and Recall Parameter Functions
The Save and Recall parameter functions are used to store and retrieve the LDC-
3900 Modular Laser Diode Controller's parameter configurations for future use.
For example, a specific test setup may be saved for later use via the Save
function, and then another setup may be used presently. Then, when the user
desires to perform the specific test again, its setup is simply recalled via the Recall
Table 2.3 Laser Error Indicators
Error Condition Action
Interlock or LASER ENABLE (pins 1 and
2 of the LASER connector must be
shorted)
Output off, INTLK/ENBL light flashes at 1 Hz
Open circuit Output off, OPEN CIRCUIT light flashes at 1 Hz.
Output shorted OUTPUT SHORTED light comes on. This indicator becomes lit
whenever the LASER output is off.
Current limit CURRENT LIMIT light flashes at 1 Hz
Optical Output Power Limit
Voltage Limit
Output off, POWER LIMIT light flashes at 1 Hz
CURRENT LIMIT light flashes at 2 Hz
MODULATION
THROUGH TO REAR
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