Sutter Instrument Lambda 421 Operation Manual

11 all of the LEDs. When you select a particular filter value you will therefore activate the LED that corresponds to that filter value but you will also set the voltage for the current control to the value that corresponds to the DAC setting set for that filter value. We will likely store DAC values for each filter value according to a scheme similar to the DG-4, but this can easily be changed. Thus, LEDs 1, 2, and 3 have four different programmable current levels selected by calling the correct filter value. LED 4 only has three separate ...

15 5. CHANGING LED MODULES 5.1 Making Maximum Current Adjustments Based on LED Module Power Specification To accommodate a wide array of LED wavelengths with different power requirements, the maximum Current supplied to each of the 4 LED channels is adjustable. The LED’s vary in maximum current from 1A to 5A, and adjustment process is straightforward. You will the following tools: � Multimeter � 1.5mm Allen wrench � Small flat blade screw driver 1. Remove the knob of the channel you would like to adjust with a 1.5mm Allen wrench ...

21 APPENDIX B. FUSE REPLACEMENT In the event that the controller fails to power up when the power switch is turned on, check the line power fuses to see if either or both have blown. The fuses are located in the fuse holder on the power entry module on the back of the controller. To remove the fuse holder first unplug the power cord from the power entry module. Press down on the lever that is located just above the fuse holder and below the power receptacle, and pry the holder straight out of the power entry module. Figure 5-1. Power entry ...

7 3. OPERATIONS This chapter describes the operation of the Lambda 421. The locations of the individual indicators, controls, and connectors are indicated in the following figure. Figure 3-1. Locations of individual indicators, controls, and connectors on the Lambda 421 controller. 3.1 Controls 3.1.1 Power Switch Main power switch turns unit off/on. 3.1.2 Light Source Channel Control Switch (ON/OFF/TTL) This is a three-position toggle switch that is used to manually turn the LED on, off, or activate TTL switching through the STROBE BNC con ...

12 In addition to the computer interfaces, there is the Strobe input, which is used as a trigger in the ring buffer mode. There is an analog output and a digital output that are both used to indicate the currently selected filter. The analog output (DAC) produces a voltage of 0 to 6 volts in 16 steps. Each increment in the filter value adds 0.4 volts to the output voltage. The digital output is a binary representation of the currently selected filter number. Table 1. Selecting channel light source intensity via external-control filter valu ...

31 Value Command Tx/ -Rx Ver . Byte Count Byte Offset Dec. Hex. Binary Alt- key- pad entry Ctrl- char ASCII def./- char. Description Tx All 1 0 253 FD 1111 1011 0253 Command byte Rx All 17 0 Echoed command sequence 1 Controller description as an ASCII sequence. E.g., “LB421” 6 Firmware version as an ASCII sequence. E.g., “V1.11”. Get System Status & Configur- ation 11 SmartShutter installation status: Normally “SS-NC” (not installed) 16 13 0D 0000 1101 Completion indicator NOTES: 1. A short delay (usually around 1 ms) is r ...