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MOST FREQUENTLY ASKED QUESTIONS |
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FQ 1110 |
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What are the differences between the PTC Series Temperature Controllers and the MPT Series Temperature Controllers? |
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FQ 1085 |
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Do the temperature controllers always provide full current to the driven element (a TEC or Peltier device, or resistive heater) when the actual temperature does not equal the set point temperature? |
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FQ 1083 |
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Battery power for Laser Drivers and Temperature Controllers - can the laser diode driver and temperature controller be powered by batteries directly? |
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FQ 1082 |
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What sensor would you recommend to be used with the WTC3243 temp controller: an AD590 temp transducer or a thermistor? Would a larger mass increase the stability? |
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FQ 1081 |
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Can the WLD3343 laser diode driver be externally modulated with an analog signal, if so what would be the bandwidth? |
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FQ 1080 |
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What is the best way to minimize electrical noise in the driver output current when using the WLD3343 Laser Driver? |
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FQ 1079 |
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Using the WLD3343 with a C-mount 2W 808nm diode, we burned up two units. My question is: in addition to the standard care one should observe, do you recommend something else? What do you think of putting a 100Ohm resistor, 0.1uF capacitor and a fast diode (inverse), all in parallel with the LD? |
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FQ 1078 |
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Working with the WLD3343, constant current, we observe a non linearity between Vset and ILD. We chose Rsense to get 2A (about 0.35Ohms) and trim Rlim not to exceed 2A and we adjust R between pin 6 and pin 5 (1K) to get 1A with Vset=1V. But there is a strong non-linearity. Is this normal? Should I use external feedback between Imon and Vset? |
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FQ 1077 |
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I am using a WLD3343 (with heat sink and fan) with a laser diode (2W, photodiode and LD isolated, B type). It needs approximately 2.5A to deliver the 2W. The problem is that I get less than about 1.7A from the WLD3343. It is connected using constant power mode, Rsense: 0.5Ohm and 1K preset for Rlimit. Vmod is 0 to 2V (to adjust power). When Vmod=2V, I adjust Rlimit and the current goes up until 1.7A and stops there. I am using a 5V supply and the LD drops 2V, so I think that the compliance is OK, but eventually I can use more voltage (6V, still in the safe operation area).
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FQ 1076 |
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We would like to use the WLD3343 and WTC3243 to control a fiber-coupled laser diode which has laser diode anode ground. This ground is connected via the case to the thermistor ground. We are not using the photodiode, we scan through a range of currents to wavelength-tune the laser. When I look at your specification for the WLD3343, the picture on page 13 shows the laser diode anode connected to pin 14 i.e. 5V. None of the other circuits show a grounded laser anode. Is the WLD3343 in fact compatible with an anode ground system? I'm worried because I can't see how it can be, if its supply is 0 and 5V, yet I need to connect the cathode to something less than 0V. |
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