THORLABS LIA100 Operation Manual Download Page 1 | Manualshive

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Doc. 0426-D01 Rev C 2/27/98

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1 of 10

Model LIA100

Lock-in Amplifier

Operations Manual

Thorlabs, Inc

435 Route 206

Newton, NJ 07860

P-(973) 579-7227

F-(973) 300-3600

www.thorlabs.com

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Summary of Contents for LIA100

Page 1: ...Doc 0426 D01 Rev C 2 27 98 Page 1 of 10 Model LIA100 Lock in Amplifier Operations Manual Thorlabs Inc 435 Route 206 Newton NJ 07860 P 973 579 7227 F 973 300 3600 www thorlabs com ...

Page 2: ...6 3 1 7 10X Expand 6 3 2 Rear Panel Controls 6 3 2 1 Output Offset Adjust 6 3 2 2 ON OFF Switch 6 3 2 3 DC Input Jack 6 3 3 Internal Jumpers and Configuration 7 3 3 1 JP1 Input Impedance 8 3 3 2 JP2 Normal Calibration Mode 8 3 3 3 JP3 Compensation Enable 8 3 3 4 JP4 Reference Signal Interface 8 3 3 5 SW2 Reference Polarity Switch 8 3 3 6 USER1 USER2 Extending the Output Time Constant 8 4 Calibrati...

Page 3: ...ng two capacitors to the LIA100 printed circuit board The LIA100 includes a six position sensitivity control to provide over 60dB of gain adjustment to accommodate a wide range of input signal levels A monitor output allows the user to monitor the buffered AC amplifier output A five position Output Time Constant switch allows the output filter to be set from 10ms to 3s to match the noise and bandw...

Page 4: ... Voltage 10V Noise 25nV Hz 1kHz Monitor Output Buffered AC amplifier output Reference Input 3mV minimum 12V maximum 50 duty cycle Reference Phase 0 or 180 Reference Input Impedance 100KΩ Output Filter Time Constant 10ms 100ms 1s 3s user defined Output 10V full scale Output Impedance 1kΩ Output Expand 10X Output Offset Adjust 12 turn potentiometer rear of enclosure Input Power 12VDC external power ...

Page 5: ...input with a low frequency cut off of 1Hz SW2 located on the PCB allows inverted reference signals to be used by providing a 180 phase shift 3 1 3 Sensitivity Switch This is a six position rotary switch to set the gain of the input AC amplifier Table 1 below shows the gain settings along with maximum input levels and amplifier bandwidth Note although the input AC amplifier has a bandwidth of up to...

Page 6: ...6Hz 100ms 1 6Hz 1s 0 16Hz 3s 0 05Hz User Defined Table 2 Output Time Constant Bandwidths 3 1 6 Signal Output This is an analog output of the de modulated DC signal This output has a 1kΩ impedance 3 1 7 10X Expand This toggle switch expands multiplies the output signal by a factor of 10 This additional 20dB of gain is added to the gain of the input AC amplifier 3 2 Rear Panel Controls 3 2 1 Output ...

Page 7: ...pers and Configuration There are jumpers provided on the LIA100 printed circuit board used for configuring and calibrating the unit Figure 2 shows the locations of the PCB components Accessing the LIA100 PCB Remove the two Phillips head screw on the rear panel Lower the rear panel and slide the cover off the back Figure 2 0 LIA100 PCB Layout ...

Page 8: ...compensation for the PSD This jumper is normally left open 3 3 4 JP4 Reference Signal Interface This is a 5 pin header which can be used to interface to a phase control circuit When using the LIA100 as a stand alone unit leave the jumper on pins 1 and 2 of JP4 3 3 5 SW2 Reference Polarity Switch This toggle switch is provided for selecting between a 0 and a 180 phase shifted reference When the tog...

Page 9: ...e PSD can be nulled using RP2 and RP3 RP2 is used to null the differential offset on the PSD as follows Remove the enclosure cover Move the jumper on JP2 to pins 2 and 3 this grounds the PSD input Attach an oscilloscope probe to TP4 PSD output Apply a 100mV 50 duty cycle reference signal to REF in Adjust RP2 to minimize any AC component observed on TP4 4 3 RP3 Common Mode Offset Adjust This adjust...

Page 10: ...horlabs offers a rack mounting bracket for conveniently mounting up to 3 LIA100 units in a standard 19 rack This rack mounting bracket can also be used for other Thorlabs products i e MDT691 High Voltage Piezo Driver Please call Thorlabs for more information about this option ...

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