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 OT-301SL Single Axis OEM
Position Sensing Amplifier
For Single Axis Position Sensing Detectors
The OT-301SL is a printed circuit board amplifier designed for direct integration into users instrumentation. It is optimized for single axis Position Sensing Detectors (PSDs) with adjustable bias voltages and three switch selectable gain ranges. The OT-301SL contains all the circuit elements to add, subtract and divide detector signals very accurately. Precision op amps and precision resistor networks provide the addition and subtraction operations and optimized analog dividers provide the final ratio. This analog divider provides the highest linearity available over a very wide signal range. The final stages provide ±10% adjustment in the Y output and also serve as high performance output buffer for driving long cables. A sum signal is also provided which equals the total detector signal and is proportional to the incident beam wattage. |
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The single axis PSD device has two anode connections designated Y1 and Y2. The beam's position is calculated from the ratios of these signals. The OT-301SL has two current mode operational amplifiers designed to accurately measure the PSD anode signal currents. The two amplifiers are designed to be closely matched and have very low noise levels.
 The exact relationship between PSD signals and beam position is at right: Where Y is the coordinate of the centroid of the beam spot on the PSD surface (measured from the detector center); and L is the size of the detector's sensitive surface in mm (e.g.: 2.5, 5.0, 10, 20, 30 mm).
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Features:
- Analog Position Output Voltage
- Sum Output
- Wide Dynamic Range Three Decades 103V/A, 104V/A, 105V/A
- DC &endash; 15 kHz
- Calibration Adjust
- Automatic Detector Bias
- Position Independent of Beam Intensity
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PSD INPUT CABLE
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PIN#
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FUNCTION
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1
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Y1 PSD Anode
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2
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Y2 PSD Anode
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3
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N/C
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4
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N/C
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5
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GND
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6
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NC
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7
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NC
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8
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PSD BIAS
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9
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GND
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POSITION OUTPUT/POWER INPUT
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PIN#
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PSD
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1
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Y Pos
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2
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GND
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3
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SUM
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4
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GND
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5
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N/C
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6
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GND
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7
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+12V
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8
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GND
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9
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-12V
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10
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GND
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| Specifications: OT-301SL Amplifier for Single Axis PSD |
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| Detector Type |
Single Axis Position Sensing Detectors
Anode Output (Common Cathode)
Cathode Outputs(Common Anode)
Bi-Cell(Common Anode or Cathode) |
| Input Sensitivity |
10(-3) A/V, 10(-4)A/V, 10(-5)A/V |
| Y Output Signals |
0V to +/- 10V |
| Sum Output Signal |
0-10V |
| Calibration Adjust |
+/- 10% of reading |
| ZERO (offset) |
+/-1.0V |
| Linearity |
+/-0.1% |
| Bias Voltage |
0V to +/- 5V +/-12V |
| Channel to Channel Tracking |
1% |
| Frequency Response |
15 kHz 10(-3)A/V
15 kHz 10(-4)A/V
15 kHz 10(-5) A/V |
| Power |
+/-12 VDC , 300mA, AC Adapter |
| Size |
3.5 x 5.00" |
| PSD Input Connector |
SUB DB9 |
| Output/Power Connector |
10 PIN (2x5 Header) |
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