Model 292X and 293X Photoreceivers Model 2921, 2930, 2931, and 2932

Transcription

1 USER S GUIDE Model 292X and 293X Photoreceivers Model 2921, 2930, 2931, and Junction Ave. San Jose, CA USA phone: (408) contact@newfocus.com

2 Warranty New Focus guarantees its products to be free of defects for one year from the date of shipment. This is in lieu of all other guarantees, expressed or implied, and does not cover incidental or consequential loss. Information in this document is subject to change without notice. Copyright 2008, New Focus. All rights reserved. NEW FOCUS, the Bookham, Inc. logo, and all Bookham, Inc. names and slogans are trademarks or registered trademarks of Bookham, Inc. in the U.S.A. and other countries. Document Number Rev. A

3 Contents Introduction 5 Overview Operation 7 Tips for Best Operation Setting up the Receiver Using USB Using an External Power Supply General Features and Principles 11 Position Sensitive Detector and Quadcell Amplifier Circuitry Appendix 21 Front panel operation XY MODE PC Data Acquisition Installing the USB drivers under Windows 2000/XP Running the demo software Virtual Serial Port Settings and Microsoft HyperTerminalTM Example Characteristics 33 Physical Specifications Technical Specifications Customer Service 37 Technical Support Service Model 292X and 293X Photoreceivers 3

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5 Introduction Overview The Models 292X and 293X family of photoreceivers use quadrant cell (Quadcell, 292X) or position sensitive detector (PSD, 293X) and a digital signal-processing system to generate position-sensitive signals from an incident light source. Models 292X and 293X key features are: Universal Serial Bus (USB) interface for data acquisition and unit control. Dual power source operation: USB mini-b connector (PC acquisition mode) or from the New Focus 0901 power supply (stand-alone mode). 5 sensitivity ranges: 5 mw, 1.5 mw, 500 µw, 150 µw, and 50 µw power range. Stand-alone operation with New Focus 0901 power supply or PC-acquisition operation mode using USB power. Available in different sizes * : 10 mm x 10 mm (Quadcell Model 2921), 4 mm x 4 mm (PSD Model 2930), 9 mm x 9 mm (PSD Model 2931) and 12 mm x 12 mm (PSD Model 2932). Contact our technical support at the number listed in Customer Service on page 37 to inquire about custom versions with different sizes or materials of photodiodes. Model 292X and 293X Photoreceivers 5

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7 Operation Tips for Best Operation Avoid Room Lights Models 292X and 293X position photoreceivers feature a large active area. Consequently, room lights can easily saturate the photoreceiver and degrade your measurements. For example, in a typically illuminated room of 1 10 µw/mm 2, the SUM output can reach 5 V on the 50-µW power range. Moreover, the 120-Hz component of fluorescent room lights will almost certainly cause measurement difficulties. For best operation, we recommend shielding the receiver as much as possible from room lights. One or more New Focus Model filter holders can be inserted into the threads of the detector housing to hold filters or as an ambient light shield. Using Optical Filters Narrow-band optical filters, such as New Focus Clarity Filters, which transmit your laser s wavelength while blocking wavelengths from other light sources, can be installed in a New Focus Model " filter holder. Consider the effects of multiple surface reflections when using optical filters during position measurement. The ideal filter has a wedge shape and good anti-reflection coating on one surface to ensure that the optical beam incident on the receiver does not contain interference fringes. Model 292X and 293X Photoreceivers 7

8 Setting up the Receiver 1. Supply power. The Models 292X and 293X are powered either by USB using a mini-b connector, or by New Focus 0901 power supply. If both USB mini-b connector and external power are present, the internal circuitry connects the external power. 2. Mount the photoreceiver. Use the 8-32 thread (M4 for metric versions) on the bottom of the casing to mount the photoreceiver to a post or pedestal. Be careful not to over-tighten when attaching to a post or pedestal, or the threaded insert can strip out of the plastic pad. The threading is seated in a non-conductive plastic pad to reduce the electrical noise associated with ground loops. Electrical ground is only introduced to the housing through the SMB outer shells. If you use a floating measurement instrument or a floating power supply, the photoreceiver may not be electrically grounded. 3. Connect the unit outputs X, Y, and SUM to your voltmeter, oscilloscope, or other instrument. 4. Align an optical beam onto the detector. Be careful to keep the optical power below the CW Saturation Power, as specified in Technical Specifications on page 35, to avoid damage to the photoreceiver and amplifier circuitry. 5. Adjust the gain. Use the two pushbutton switches on top of the receiver to set the gain. Table 1 on page 14 gives a detailed description of the different channel gains and bandwidths associated with each gain setting. Use the smallest setting that is greater than the optical power striking the detector. 8

9 Using USB Models 292X and 293X can be fully operated from the USB port available in most PC computers by connecting the Quadcell or PSD to the computer using the supplied USB mini-b connector. Regardless of the selected operation mode, data can be continuously acquired from a Model 292X or 293X when hooked up to the USB host. USB 1.1, or later, is supported. Using an External Power Supply Models 292X and 293X can be powered from the USB port (USB 1.1, or later). When not using a USB port, we recommend powering the unit from a New Focus Model 0901 power supply for low noise operation. To connect to the 0901 power supply, use our Model 0928 cable. A third-party 15V 250 ma power supply can also be used. Please consult our technical support if you want to implement this option. Contact information appears in Customer Service on page 37. Model 292X and 293X Photoreceivers 9

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11 General Features and Principles Position Sensitive Detector and Quadcell Position Sensitive Detectors (PSDs) and Quadcell detectors consist of a p-n junction photodiode in which one or two sides of the junction have multiple electrically separated contacts. Figure 1(A) shows the connections for the PSD used in New Focus 293X models. Figure 1(B) shows the electrodes of the four separate photodetectors, or quadrants, of a Quadcell detector. In both cases, the electrodes provide the photocurrents I A, I B, I C and I D, and there is a common contact. The four photocurrents are generated when an optical beam strikes the L x L active area. Figure 1: Electrical connections and photocurrents in a PSD and Quadcell I A L (A) PSD y x 0,0 I B common I A I B L (B) QUADCELL y x 0,0 common I D L I C I D L I C Figure 2 shows the wavelength responsivity of the 2921, 2930, 2931, and 2932 models. Models 2921, 2930, and 2931 feature an extra protective window with 50% transmisivity. Therefore, the effective responsivity for these models is half that shown in the figure. Model 292X and 293X Photoreceivers 11

12 Figure 2: Photodetector responsivity R of models 2921, 2930, 2931, and 2932 Responsivity, A / V Model 2932 Models 2921, 2930, 2931 ( glass window ) wavelength, nm Note: Models 2921, 2930, and 2931 feature a protective window with 50% transmisivity, which reduces the effective responsivity to half that shown in the figure. The position-current relationship for an ideal PSD is linear across the active area: and I + I D ( I B I + I + I A D B + I + I C ) = x L A C 2 I + I B ( I C I + I + I A D B + I + I A D = C ) 2 y [ PSD] L The position-current relationship for a Quadcell, in contrast, is only linear near the center and depends on the beam radius r: and I A + I D ( I B I + I + I A D B + I + I C C ) x 0.65 r 12

13 I A + I B ( IC I + I + I A D B + I + I D C ) y 0.65 r [ Quadcell] In practical applications, ambient light and other noise courses add offsets to I A, I B, I C and I D, which can reduce position accuracy. The digital signal processing circuitry of Models 292X and 293X are designed to correct for errors resulting from noise, and thus provide the best possible accuracy for beam position. Amplifier Circuitry Figure 3 illustrates a simplified block diagram of the Models 292X and 293X electronics. The detector is connected to four transimpedance amplifiers, whose gain is controlled by the microcontroller, µc. Along with the analog-to-digital and digital-to-analog converters, ADC and DAC respectively, the microcontroller calculates the position of the beam as detailed below. The user can select two different modes of operation: Analog Mode and XY MODE selected by the Mode Selection switch in Figure 3. The operation modes are explained below. Figure 3: Electronics diagram of PSD and Quadcell models I A I B I C I D Gain Control ADC USB-PC connector µc DAC X-Y Mode X Transimpedance Am plifier V x Microcontroller Unit Mode selection Analog Mode Y V y SUM Model 292X and 293X Photoreceivers 13

14 Analog Mode Analog Mode is the default mode of operation. In this mode, the 292X and 293X output the raw, unscaled X and Y voltages as well as the SUM output. This mode assumes that scaling is done by the user, after externally digitizing X, Y, and SUM outputs. The X, Y and SUM output connectors show the signals V x, V y, and SUM according to and x [ I + I ( I IC )] V = G + y A D [ I + I ( I I D) ] V = G + A B B C ( I + I + I I ) SUM = G + A where G is the transimpedance amplifier gain, which can be selected from the top panel switches. Table 1 on page 14 shows G for Models 2921, 2930, and 2931, and Table 2 on page 15 shows R for Model Table 1: Transimpedance gain, conversion gain, bandwidth and output excursion voltage for Models 2921, 2930, and 2931 Models 2921, 2930, 2931 D B C Gain Transimpedance gain* Conversion gain (λ = 900nm) X, Y, SUM output range ANALOG MODE G (V / A) G. R ( V / W) X,Y (V) SUM (V) F3dB (KHz) 2930/ μw 333, ,000 ± μw 100,000 33,300 ± μw 33,300 10,000 ± mw 10,000 3,333 ± mw 3,333 1,000 ±

15 Table 2: Transimpedance gain, conversion gain, bandwidth and output excursion voltage for Model 2932 Model 2932 Gain Transimpedance gain* Conversion gain (λ = 900nm) X, Y, SUM output range ANALOG MODE G (V / A) G. R ( V / W) X,Y (V) SUM (V) F3dB (KHz) 50 μw 333, ,000 ± μw 100,000 66,600 ± μw 33,300 20,000 ± mw 10,000 6,660 ± mw 3,333 2,000 ± * Specified for high impedance external load (1 M) HINT: select the highest gain setting that maintains the SUM signal below 5 V. Analog Mode: Frequency Response, Noise, and Position Accuracy The typical frequency response of X, Y and SUM output channels is shown in Figure 4 as measured with small signal modulation on a laser beam impinging on the PSD active area. The measured frequency response has a -3-dB bandwidth of at least 100 khz, irrespective of the input power. Figure 4: Typical frequency response at different gain settings, similar for all models Response, db mw µw E E E E E+06 Frequency, Hz Model 292X and 293X Photoreceivers 15

16 The photoreceiver noise (Vn) is measured as a noise spectral density [ V RMS / Hz ]. The typical noise spectral density at each of the gain settings is shown in Figure 5. Depending on your measurement system, you may utilize only a fraction of the receiver's available bandwidth. The noise in your measurement will be the integral of the receiver's noise spectral density over the frequency range (f min to f max ) observed by your measurement system: V user = f f max min V 2 n df Figure 5: Typical output voltage noise spectral density, similar for Models 2921, 2930, 2931, and 2932 Noise, V / vhz 1.E-04 1.E-05 1.E-06 Analog mode New Focus 0901 powered 50 µw 150 µw 500 µw 1.5 mw 1.E Frequency, KHz 5 mw For a flat noise spectrum in a DC-coupled measurement system with a 3-dB bandwidth of f 3dB, the measured V n noise for V x-n, V y-n and V SUM-n is approximately: π 2 Vn f3db One can obtain the position of the beam form previous equations as x / L = V x / SUM and y / L = V y / 16

17 SUM. However, offsets produced by ambient illumination introduce DC components V x-dc, V y-dc, and V SUM-DC. The offsets lead to x and y position errors e x and e y, given by and V + V SUM + V SUM DC + Vx + V SUM n x e L x x DC n + = 2 x Vy + Vy DC + Vy n y + e = 2 SUM + V + V L SUM DC SUM n As an example, a Model 2931 (L = 9 mm) in Analog Mode with a 50 µw range generates about 20 µv RMS of noise. If we assume that SUM = 0.5V and V x = 0 (a centered beam) with V x-dc = 0, then the position uncertainty e x is approximately 0.2 µm. That uncertainty could be reduced ten times by externally limiting the bandwidth to 1 khz, in which case ambient light would become the dominant error source. As an example, if V x-dc = 20 mv in the example above, then e x ~ 200 µm. Errors due to ambient light can be reduced by using optical bandpass filters (such as our 591X) at the signal wavelength and or by adding concatenated filter adapters (Model 1280) at the front of the unit to form a light baffle. The XY MODE with Dark Calibration described in the next section uses signal processing to circumvent the majority of these offset errors. XY MODE: Normalization of the Outputs In XY MODE, the μc performs the signal normalization to obtain the most accurate position outputs. In addition, it incorporates Dark Calibration to correct for the effects of the ambient light offsets V x- DC, V y-dc and V SUM-DC described above. Moreover, XY MODE limits the electrical bandwidth to < 100 Hz and Model 292X and 293X Photoreceivers 17 y

18 thus eliminates errors otherwise associated with V x-n, V y-n and V SUM-n as explained above. Specifically, the μc performs the following calculations: X V + V = k SUM + V SUM DC V V SUM offset x e = 2k L x x DC x offset + x and Y V + V = k SUM + V SUM DC V V SUM offset y ex = 2k L y y DC y offset + where k is a constant. After the calibration is performed, V x-dc, V y-dc and V SUM-DC cancel out with V x-offset, V y-offset and V SUM-offset. Then, the expressions for X and Y can be approximated as: PSD: x + ex X = 2.25Volts and L / 2 Quadcell: y + ey Y = 2.25Volts L/ 2 X x + ex = 2.5Volts and 0.65 r y + ey Y = 2.5Volts 0.65 r Figure 6(A) shows the typical position - voltage transfer function for Models 293X under XY MODE combined with Dark Calibration Mode. The X output data was acquired while the beam was scanned in the x direction. Identical results are obtained when measuring along the y axis. Figure 6(B) shows the transfer function for Model 2921 in similar conditions. Note that the transfer slope depends on the beam size and it becomes non-linear as the beam departs from the Quadcell center. 18

19 Figure 6: Typical Voltage - position transfer X (x) in models (A) 2930, 2931, 2932 and (B) 2921 (beam radius ~ 2.5 mm) operating under XY MODE with Dark Calibration Mode ON. X output, V X output, V A Beam position, mm B Beam position, mm Model 292X and 293X Photoreceivers 19

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21 Appendix Front panel operation Switches Gain-up [ ]: increases gain Gain-down [ ]: decreases gain LED Indicators Gain settings: 5 mw, 1.5 mw, 500 µw, 150 µw, 50 µw. XY MODE: Indicates XY MODE is ON. Dark Calibration: Indicates XY MODE plus Dark Calibration are ON. OL: Indicated overload condition (see below). Figure 7: Front panel indicating Analog Mode operation at 5 mw Gain Setting GAIN 5mW 500µW 50µW OL 1.5mW 150µW X Y mode Dark Calibration Avoid overload condition. The overload condition occurs when SUM reaches approximately 5V. This condition requires immediate attention: block the beam and then reduce the gain or add ND filters to attenuate the signal to a safe level. Model 292X and 293X Photoreceivers 21

22 Figure 8: Front panel indicating overload condition 5mW 500µW 50µW 1.5mW 150µW X Y mode Dark Calibration In special cases such as short pulse signals or very small beams, OL may not be detected, which could cause detector damage. Therefore, take extra precautions to prevent damaging the detector or erroneous measurements by attenuating the signal. XY MODE Figure 9: Summary of operation modes and switch strokes for Models 292X and 293X Figure 9 summarizes the steps necessary to set XY MODE and calibrate for true position outputs. Analog Mode (default) GAI N 5mW 500µW 50µW OL 1.5mW 150µW X Y mode Dark Calibration ^ (2 sec) X-Y MODE (no calibration) 5mW 500µW 50µW OL A B v (5 sec) ^ (2 sec) v C (2 sec) Calibrate (acquire Vx-offset, etc) 1.5mW 150µW X Y mode Dark Calibration v (2 sec) X-Y MODE + Dark Calibration 5mW 500µW 50µW OL 1.5mW 150µW X Y mode Dark Calibration ^ (2 sec) X-Y MODE 5mW 500µW 50µW OL GAIN blinks 1.5mW 150µW X Y mode Dark Calibration D Upon powering the unit, the default operation is Analog Mode (A). The XY MODE is activated by pressing ( ) for 2 seconds (B). The unit remains in the last selected gain state from the Analog Mode. To correct for ambient light press ( ) for 2 seconds. The Dark Calibration LED will light (C). To complete the setup run the calibration: turn off the measured beam but make sure that ambient light and other interfering signals are still present. Then press ( ) for 5 seconds; the LED will continue to blink upon releasing the switch while the μc measures V x-offset, V y-offset, SUM offset. 22

23 When the LED stops blinking, the unit is ready for measuring position and the signal beam can be turned back on. You can check that the calibration is valid by precisely pointing a laser beam into the active area and successively attenuating it down to ~10% of its original intensity. The X and Y signals should not change with intensity. Make sure that the attenuators, e.g. neutral density filters, do not steer the beam after they are inserted in the beam path. The unit provides a signal of ± 2.25 V for a beam translation from one end to the other of the PSD. To reenter Analog Mode (A), press ( ) for 2 seconds. The unit will exit XY MODE and resume its previous gain settings. In summary, follow these steps for a good calibration: 1. Set the maximum possible gain such that the sum signal is below 5 V. 2. Activate XY MODE by pressing ( ) for 2 sec 3. Set Dark Calibration ON by pressing ( ) for 2 sec 4. Turn off the signal beam 5. Run the Calibration Procedure by pressing ( ) for 5 sec, the LED will blink while the μc takes data (Updates V x-offset, V y-offset, SUM offset ). Things to remember: When set, the XY MODE holds the last gain settings inherited from Analog MODE. Offset stored values (V x-offset, V y-offset, and SUM offset ) are valid for a given amount of ambient light. If experimental conditions change, rerunning calibration may be required to restore the system s accuracy (avoid operating with a low signal to ambient light ratio). Under XY MODE, calibration is only valid for a particular GAIN setting. The Calibration Model 292X and 293X Photoreceivers 23

24 Procedure must be rerun after reentering XY MODE at a different gain setting The Dark Calibration Procedure must be run every time the unit is reenergized. We recommend use of New Focus 1280 adapters and 591X filters. PC Data Acquisition Models 292X and 293X connect to a PC via a mini-b USB connector to obtain power and acquire data. Their design flexibility ensures that position data can be read any time, either during Analog or XY MODE operation. The unit works as a virtual serial port under Microsoft Windows 2000/XP. Windows detects a new device after the unit is plugged into the PC s USB port for the first time. Installing the USB drivers under Windows 2000/XP A set of drivers and a demo program are provided with the unit. To install the unit: 1. Connect the PSD unit to a PC using the provided 2-meter USB mini B cable. After the unit is detected, the Wizard will launch and the following window appears. 24

25 2. Choose Install from a list or specific location (Advanced) and click Next. 3. Select the appropriate hardware driver. 4. Check Search for the best driver in these locations. 5. Check Include this location in the search. 6. Browse to the location of the unit driver nf_293x.inf. 7. Click Next to install the driver. Model 292X and 293X Photoreceivers 25

26 8. When the warning appears, click Continue Anyway. A Communications Port window will appear. It will take several seconds to install the driver. After the driver is installed, you can use Windows Device Manager to check the communication port that was assigned to the 2921, 2930, 2931 and Choose Start > My Computer, press the right mouse button and choose Manage. 2. Click Device Manager in the tree to list devices, including the new COM port assignment. 26

27 Typical ports assignments are COM3 through COM7. Figure 10: A new COM port shows in the Windows Device Manager Running the demo software To quickly get you started using your Quadcell or PSD with a PC, we provide a demo application. This program illustrates it s operation, as well as shows the commands necessary to acquire data from the unit. A screenshot of the demo program is shown below. Here is the starting sequence: 1. Connect the unit to the PC s USB port. 2. Run the installer application. 3. Load the application, but DO NOT press the run button yet. 4. On the application, select the appropriate communication port from the visa resource name. For example, ASRL3::INSTR for COM 3. (ASRLx must match the COMx port assigned in the device manager on Figure 10.) 5. Run the application (CTRL R). The gain selection, as well mode selection (Analog or XY MODE), is performed through the PSD Model 292X and 293X Photoreceivers 27

28 panel. A green indicator in the demo application will lit if the XY MODE is active. Figure 11: Windows view of the 292X/ 293X Demo Application For user-developed applications, we provide the following commands for operating the unit. Table 3: List of serial port commands for Models 292X and 293X Command Parameter name Parameter range RD 0 X channel -5 to 5 Volts RD 1 Y channel -5 to 5 Volts RD 2 SUM channel -5 to 5 Volts RD 20 X normalized -5 to 5 Volts RD 21 Y normalized -5 to 5 Volts RD 22 Vx-offset -5 to 5 Volts RD 23 Vy-offset -5 to 5 Volts RD 24 SUMoffset -5 to 5 Volts RD 8 XY MODE 1 = XY mode ON 0 = analog mode 28

29 Troubleshooting the Demo Application Running the demo application can sometimes give the following error: This error is caused by having a running engine different than the version of Labview TM used to compile the demo file. To fix it, go to National Instruments website and search for Executable Version (7.1.1) Doesn't Match Resource File (7.1). More information can be found at: 680E61A4D02158A186256F7A0073C228 Virtual Serial Port Settings and Microsoft HyperTerminal TM Example Models 292X and 293X are recognized by Windows TM as a (virtual) serial port. The serial communications protocol settings are: All commands and queries should terminate with a line feed (LF) character. (A carriage return (CR) before LF is optional). All responses are terminated with a CR followed by LF. Internal response delay is 3 ms. The Microsoft HyperTerminal TM application can be set as shown below. 1. Open the application. Model 292X and 293X Photoreceivers 29

30 2. Choose the COM PORT where the PSD unit is present. 3. Configure the settings to set up the virtual serial port in HyperTerminal as shown below. 4. After you configure the settings, click on the phone icon and start the HyperTerminal TM session. 30

31 The unit will respond to the commands shown below. For more information on how to set the application, consult Microsoft Windows Help. Figure 12: Typical commands and readings in the HyperTerminal screen Model 292X and 293X Photoreceivers 31

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33 Characteristics Physical Specifications USB (MINI B CONNECTOR).46 [11,8] X-OUTPUT* Y-OUTPUT* SUM-OUTPUT* 1.73 [44,0] 1.38 [35,1] 2.08 [52,9] 3.06 [77,6] EXTERNAL INPUT POWER 15VDC CENTER POSITIVE.60 [15,2].68 [17,3].50 [12,8] * SMB CONNECTOR Model 292X and 293X Photoreceivers 33

34 GAIN-UP SWITCH GAIN-DOWN SWITCH 3.64 [92,3] Ø.70 [17,8] CLEAR APERTURE SENSOR ACTIVE AREA 4MM X 4MM. DISTANCE FROM OUTER HOUSING TO SENSOR ACTIVE SURFACE [7.42] NOMINAL [25,4] 2X1.25 [31,8] THD FOR MOUNTING OPTIONAL THREADED ACCESSORIES (NOT INCLUDED) 2.50 [63,5] 8-32 (M4) THD 1.16 [29,3].58 [14,7] 34

35 Technical Specifications Model # Photodector size x4 mm 2 9x9 mm 2 12x12 mm 2 10x10 mm 2 Wavelength Range (typ) nm nm nm nm Resolution (typ) [1] 2 μm 2 μm 4 μm 1 μm Accuracy (typ) [2] ± 15 μm ± 25 μm ± 50 μm N/A Position Transfer Function (typ) [1,2] 1,125 mv/ mm 500 mv/mm 375 mv/mm 1540 mv/mm [1] Maximum Responsivity (970nm, typ) 0.3 A/W 0.3 A/W 0.6 A/W 0.3 A/W Transimpedance Gain 3.3x10 3 to 3.3x10 5 V/A 3.3x10 3 to 3.3x10 5 V/A 3.3x10 3 to 3.3x10 5 V/A 3.3x10 3 to 3.3x10 5 V/A Conversion Gain 10 3 to 10 5 V/W 10 3 to 10 5 V/W 2x10 3 to 2x10 5 V/W 10 3 to 10 5 V/W CW Saturation Power [3] 5mW 5mW 2.5mW 5mW Analog Output Interface, X, Y, SUM SMB connector SMB connector SMB connector SMB connector Output Impedance, SMB 3-dB Bandwidth, Analog Mode) Output Voltage Swing, X, Y Output Voltage Swing, SUM 100 Ω 100 Ω 100 Ω 100 Ω 100kHz 100kHz 100 khz 50 khz ± 5 V ± 5 V ± 5 V ± 5 V 0 to 5 V 0 to 5 V 0 to 5 V 0 to 5 V External Power Supply Requirements 15 V or USB powered 15 V or USB powered 15 V or USB powered 15 V or USB powered USB output USB 1.1, 2.0 Mini B USB 1.1, 2.0 Mini B USB 1.1, 2.0 Mini B USB 1.1, 2.0 Mini B Digital sample rate (typ) [4] 200 Hz 200 Hz 200 Hz 200 Hz Model 292X and 293X Photoreceivers 35

36 Model # Photodector size x4 mm 2 9x9 mm 2 12x12 mm 2 10x10 mm 2 Power Supply [5] Metric Versions Add M to Model # Add M to Model # Add M to Model # Add M to Model # [1] Peak-to-peak voltage on X or Y output. Tested in XY MODE, with Dark Calibration ON and Dark Calibration performed measuring a HeNe beam, with a 633 nm laser line filter. Model 2921: Beam at center position, r=2.5mm (see Figure 6B). [2] Measured over 75% of full span. [3] Warning: Beam intensity MUST NOT exceed 10 mw / mm² in Models 2921, 2930, 2931, and 5 mw / mm² in Model [4] Sample rate will vary with PC software acquisition time. [5] For 0901 use cable Power consumption: max 200mA, Voltage (max) 18V. 36

37 Customer Service Technical Support Information and advice about the operation of any New Focus product is available from our technical support engineers. Engineers are on duty from 8:00 5:00 PST, Monday through Friday (excluding holidays). For quickest response, ask for Technical Support and know the model number of your photoreceiver. Phone: (408) Fax: (408) Support is also available by We typically respond to within one business day. Service In the event that your photoreceiver malfunctions or becomes damaged, please contact New Focus for a return authorization number and instructions on shipping the unit back for evaluation and repair. Model 292X and 293X Photoreceivers 37

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