ILX Lightwave LDX-3620 User Manual Download

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User’s Guide

Ultra Low Noise Current Source

LDX-3620

ILX Lightwave Corporation P. O. Box 6310 Bozeman, MT, U.S.A. 59771

· ·

· 1-800-459-9459 ·

www.ilxlightwave.com

U.S. & Canada

International Inquiries

: 406-586-1244 Fax 406-586-9405

E-mail: [email protected]

70001802_7/01

Summary of Contents for LDX-3620

Page 1: ...rrent Source LDX 3620 ILX Lightwave Corporation P O Box 6310 Bozeman MT U S A 59771 1 800 459 9459 www ilxlightwave com U S Canada International Inquiries 406 586 1244 Fax 406 586 9405 E mail support...

Page 2: ......

Page 3: ...e to the product or equipment WARNING Warning indicates a potentially dangerous situation which can result in serious injury or death WARNING Visible and or invisible laser radiation Avoid direct expo...

Page 4: ...ive Humidity 80 RH non condensing Operating temperature range of 0 C to 40 C Storage and transportation temperature of 40 C to 70 C Maximum altitude 3000 m 9843 ft This equipment is suitable for conti...

Page 5: ...rument serial number from the rear panel of the instrument 3 Attach the anti static protective caps that were shipped with the instrument and place the instrument in a protective anti static bag 4 Pla...

Page 6: ...ng information If ILX Lightwave determines that a return to the factory is necessary you are issued a Return Authorization RA number Please mark this number on the outside of the shipping box You or y...

Page 7: ...Current Adjustment 6 2 3 7 OUTPUT On Off 6 2 3 8 OUTPUT ADJUST Controls 7 2 3 9 DISPLAY Selector 7 2 3 10 Output 4 1 2 Digit LCD Display 7 2 3 11 OUTPUT SHORT Indicator 7 2 3 12 OUTPUT ERROR Indicato...

Page 8: ...erator 21 2 5 12 Setting the Photodiode Feedback Gain 21 2 5 13 Setting the Laser Power in CONST POWER Mode 24 CHAPTER 3 MAINTENANCE 27 4 1 Introduction 27 4 2 Battery Maintenance 27 4 3 Battery Repla...

Page 9: ...found in Figure 2 3 Recommended cable shielding schemes are found in Figures 2 4 A through D and discussed in Sections 2 5 5 and 2 5 6 Figure 3 1 is a block diagram of the LDX 3620 Battery maintenanc...

Page 10: ...nA rt Hz 1 KHz 815 pA rt Hz 2 6 nA rt Hz 25 KHz 315 pA rt Hz 795 pA rt Hz Stability 10 20 seconds 0 1 ppm 3 5 minutes 1 ppm 10 30 minutes 10 ppm Temperature Coefficient 10 ppm o C Transients 10 uA Ra...

Page 11: ...200 mA 0 500 mA GENERAL AC Power Input Voltage Range 100 125 or 210 250 VAC Line Frequency 50 60 Hz Battery 12 volt supply 4 5 amp hour sealed lead acid battery standard 12 volt supply 1 2 amp hour s...

Page 12: ......

Page 13: ...d on the rear panel If it is not correct see Section 4 4 for the procedure to change the line voltage range The AC power cord connects to the rear of the unit Turning on the AC POWER switch on the rea...

Page 14: ...the point where the low battery B is indicated greatly reduces the battery life and is not recommended See Section 4 2 for recommended battery maintenance If the batteries continue to be discharged a...

Page 15: ...OUTPUT ADJUST sections on the front panel If the control signal is a DC level then the output optical power is held constant If the control signal is modulated then the output optical power is modula...

Page 16: ...ystal display on the front panel of the instrument When the DISPLAY push button is in the LASER position out the display reads the average current setting determined by the MODULATION and OUTPUT ADJUS...

Page 17: ...he LIMIT adjustment The output circuit is open The maximum compliance voltage of the LDX 3620 is insufficient to drive the load Table 2 1 lists the possible conditions leading to a lighted OUTPUT ERRO...

Page 18: ...the bandwidth across a 100 ohm load is cut to about 20 kHz The LOW setting decreases noise and prevents oscillation of the LDX 3620 when it is connected to an inductive load such as a bias tee circui...

Page 19: ...r panel to accept full scale feedback currents from 20 uA to 1 mA An eight position switch provides COARSE gain adjustment while a four turn trimpot provides FINE adjustment The adjustment procedure i...

Page 20: ...SSIS GROUND Connector Chassis ground is available on the rear of the unit through a banana jack connected to the LDX 3620 cabinet When a three wire line cord with earth ground is used the cabinet of t...

Page 21: ...12 Figure 2 2 LDX 3620 Rear Panel Figure 2 3 Output Connector Pin out...

Page 22: ...rone to open should the cables be jostled or bumped Section 2 5 5 Refer to Section 2 5 6 for photodiode feedback connections 3 Leave the OUTPUT switch in the OFF SHORT position out Turn on the DC powe...

Page 23: ...nge is selected on the LDX 3620 the guaranteed compliance voltage is 5 volts If the current LIMIT is set to 100 mA the maximum resistance value can be found by Ohm s Law R E I 3 2 V 0 1 A 32 ohms If t...

Page 24: ...1 and 2 of the LDX 3620 rear panel OUTPUT connector These pins must be shorted to enable the LDX 3620 current output When this circuit is opened the interlock turns off the current output and the OUTP...

Page 25: ...e damage is caused by a momentary circuit break and remake before the final circuit break Therefore always make sure that the cabling is secure An open circuit is indicated by the front panel OUTPUT E...

Page 26: ...ithin the specified maximum 6 volt common mode voltage relative to the laser current output pins 4 and 5 of J401 The circuit of Figure 2 4B should be used if feasible 2 5 7 RAMP TRIGger Output Connect...

Page 27: ...ias Instrument OUTPUT 7 6 9 5 3 P D L D Earth Ground Figure 2 4A Common Laser Cathode Photodiode Cathode Bias Module OUTPUT 7 6 9 5 3 P D L D Earth Ground Figure 2 4B Common Laser Cathode Photodiode A...

Page 28: ...9 Bias Module OUTPUT 7 6 9 5 3 P D L D Earth Ground Figure 2 1 C Common Laser Anode Photodiode Cathode Bias Module OUTPUT 7 6 9 5 3 P D L D Earth Ground Figure 2 1 D Common Laser Anode Photodiode Anod...

Page 29: ...tton switch to the LASER position out 2 Adjust the COARSE and FINE output adjust knobs until the display reads the desired output current level 3 Push the OUTPUT switch to the ON position in The displ...

Page 30: ...he ramp span and period should be made while using an oscilloscope to monitor the output current i e voltage drop across a resistor in series with the load The current LIMIT circuit may clip the outpu...

Page 31: ...t panel OUTPUT ADJUST knobs to their minimum settings fully counter clockwise CCW 5 Turn the front panel MODE selector to the CONST POWER position 6 Push the OUTPUT switch to the ON position in If the...

Page 32: ...utput power level If this cannot be accomplished using the FINE gain adjustment trimmer one more repetition of Step 7 may be required 9 Push the DISPLAY switch to the MONITOR position in to display th...

Page 33: ...urrent 4 Press the OUTPUT switch to the ON position in 5 Adjust the MODULATION and OUTPUT ADJUST front panel controls as in CONST CURRENT mode but keep in mind the following The output optical power o...

Page 34: ......

Page 35: ...attery the 3138 Long Life option The batteries are continuously charged whenever the LDX 3620 is connected to an AC power source and the rear panel AC power switch is turned on Full recharge of the ba...

Page 36: ...acid battery ILX P N 597 613 211 The positive 12 volt supply battery is a Power Sonic model PS 1245 ILX P N 597 613 251 3 4 AC Line Voltage Selection AC line voltage selection is made with jumpers on...

Page 37: ...ould replacement be necessary first disconnect the power cord and turn the AC POWER switch OFF Refer to Table 3 2 for the correct fuse ratings FUSE REPLACEMENT GUIDE Line Voltage Replacement Fuse 100...

Page 38: ...ially lethal or harmful voltages are present and exposed when the top of the unit is removed Refer to the component layout diagrams Figures 3 5 through 3 7 to find the locations of the adjustment trim...

Page 39: ...increase the output current until the calibration ammeter reads 500 0 mA or continue adjustment a few turns after the OUTPUT ERROR indicator lights If the output current has reached 500 mA proceed to...

Page 40: ...e current LIMIT knob must be calibrated to 500 mA at its maximum setting 1 Repeat the settings of Steps 1 4 of Section 3 6 1 2 Turn the OUTPUT ADJUST knobs fully clockwise to their maximumsettings 3 T...

Page 41: ...l clipping of the output by the current limit circuit at the ramp maximum can be seen on the oscilloscope Reverse the adjustment to the point where the clipping just disappears 3 7 Disassembly The top...

Page 42: ...tions and shielding 11 15 17 Constant Current mode mode switch 6 operation 20 23 Constant Power mode switch 6 operation 14 24 photodiode feedback connections 10 17 photodiode feedback gain adjustment...

Page 43: ...24 ramp adjustment 21 range selection 5 Output current level display 7 current limit 6 20 modulation 5 6 20 21 noise specification 2 on off 6 7 optical power level display 7 23 ramp trigger 11 17 Pho...

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