FST-001-B User Manual V1.0c
Contents
1. Making Light Work Lighter X Lana Dhnatarnre CGE AGE CAN E E MES EES HIT C or por ation FST 001 B Fiber Stretcher Operation Manual Fiber Stretcher April 6 2005 General Photonics Corp Ph 909 590 5473 5228 Edison Ave Fax 909 902 5536 Chino CA 91710 USA www generalphotonics com Document GP UM FST 001 B 10 Page 1 of 9 Table of Contents Caution Section 1 Section 2 Section 3 Section 4 Specifications Overview Operating Instructions Technical Support Document GP UM FST 001 B 10 Page 2 of 9 IMPORTANT SAFETY NOTE The FST 001 B PCB board inside the enclosure can produce hazardous voltages and currents The DC voltage on the board can reach 150 V Never open the cover of the FST 001 B or touch any part of the board or cable connectors when electric power is on CAUTION The maximum peak current to each channel of the FST 001 B is 60 mA However the maximum current available to each channel will depend on operating conditions Because the on board DC DC converter output current rating is 80 mA the sum of the currents to the four channels cannot exceed 80 mA If each channel is operated sequentially the current limit per channel is 60 mA However if all 4 channels are in operation simultaneously the maximum continuous operation current rating for the FST 001 B is 20 mA per channel A severely distorted output waveform indicates that the unit is being operated at a current that exceed2. components in this system General Photonics is committed to high quality standards and customer satisfaction For any questions regarding the quality and the use of the FST 001 B or future suggestions please contact General Photonics Corporation at 909 590 5473 telephone or 909 902 5536 fax or by e mail at info generalphotonics com General Photonics will respond to all customer questions within 24 hours during regular business hours You can also write to General Photonics 5228 Edison Avenue Chino California 91710 USA Document GP UM FST 001 B 10 Page 9 of 9
3. l continuous 60 mA per channel peak current limit 5V 1550 nm standard lt 0 2 dB lt 0 1 dB gt 1000 mW FC PC FC APC SC PC SC APC 0 to 5V 220 KQ TTL 12 bit data 4 bit control lt 400 us rise fall time 65 us rise fall time 0 140V DC 50 ohms 30 V V 1 lt 40 mV RMS 16 kHz 0 to 40 C 20 to 60 C Page 4 of 9 Section 2 Overview The FST 001 B is a precision multiple channel fiber stretcher with four piezoelectric actuators that can be driven individually for high resolution or collectively for large stroke Stretching the fiber causes a change in both the length and index of refraction of the fiber resulting in a change in optical path length Sample applications include optical path length compensation and various sensing and interferometric applications including medical imaging The FST 001 B accepts both analog and digital control signals It has a closed loop gain of 30V V so analog input voltages of 0 5V are sufficient to cover the full range of the stretcher The external analog control voltage can be supplied by any stable voltage source including function generators DAC output or DC power supplies For digital control applications the FST 001 B can be controlled by a 16 bit parallel TTL digital signal from any logic circuit The digital signal controls each channel individually The standard board of the FST 001 B operates at 12V A 12V power adapter that plugs into a standard wall p
4. n step is required when starting digital control mode operation 1 3 Connect digital input connector to FST 001 B after initial setup steps Turn on 12V DC power supply power switch on front panel Launch an application program that generates appropriate digital control signals An initialization step is required at the beginning of digital control The initialization process sets the following lines W R change from 0 1 0 1 DBO DB11 from 0 1 0 AO Al from 0 1 0 CS from 0 1 0 1 The initialization process can be performed in parallel Digital control of output voltages a Change W R from 1 default to 0 load data mode Document GP UM FST 001 B 10 Page 8 of 9 b Load data to DBO DB11 c Set Al AO to select output channel according to Table 6 Table 6 Output channel selection control assignment Channel Al AO 1 0 0 2 0 1 3 1 0 4 1 1 d Change CS chip select from 1 default to 0 select chip and back to 1 again This feature is very useful when multiple FST 001 B units are in use The user can apply the CS signal to select different boards and to share the data lines e Maintain W R at O and repeat steps b to d to operate another output channel f Ifreset is needed change Reset to 1 g Turn off power supply when finished Section 4 Technical Support The FST 001 B can be serviced only by manufacturer authorized personnel There are no user serviceable
5. ower supply is provided 2 1 Interface descriptions Analog and digital input connectors are mounted on the rear panel of the FST 001 B as shown in Figure 1 The analog and digital input connectors are a 10 pin and a 20 pin AMP type respectively All connectors on the FST 001 B have standard 0 10 inch 2 54 mm pin separation The pinout diagram is shown in Figure 1 TTL Input Analog Input 19 17 15 13 119 7 5 3 1 O oO A w O Onn OG OnOv OO 20 18 16 14 12 10 8 A 4 2 10 R 6 4 2 Figure 1 Analog and digital input connector configurations The pin assignments for analog and digital input connectors are summarized in Table 1 and Table 2 respectively The analog input connector uses 5 independent connections while the digital connector has 18 independent connections Document GP UM FST 001 B 10 Page 5 of 9 Table 1 Analog input connector pin assignment list Pin number Assignment Function 1 VINI Channel 1 input 2 VIN3 Channel 3 input 3 AGND Analog ground 4 AGND Analog ground 5 VIN2 Channel 2 input 6 VIN4 Channel 4 input 7 AGND Analog ground 8 AGND Analog ground 9 AGND Analog ground 10 AGND Analog ground Table 2 Pin assignment for digital input connector Pin Assignment Function number 1 WR Read Write 2 ICS Chip select negative active 3 NC Not connected 4 AO Channel control bit 1 5 Al Channel cont
6. peration If a function generator is used make sure that the applied signal frequency and amplitude do not overload the circuit To avoid damage to the amplifier board periodic analog inputs such as from a function generator should meet the following conditions a For one channel operating alone or for two channels channels 1 and 3 or 2 and 4 operating simultaneously input conditions must satisfy BW f V lt 2 5 kHz V For example if peak to peak input voltage V 2V input frequency f must be lt 1 25 kHz b For three or 4 channels operating simultaneously or if channels 1 and 2 or 3 and 4 are operating simultaneously input conditions must satisfy BW f V lt 1 25 kHz V For example if peak to peak input voltage V 2V input frequency f must be lt 0 625 kHz Turn off the power supply when not in use 3 2 2 Digital control mode operation Unlike the analog control mode the digital control signals operate sequentially The digital control signal is applied to one channel at a time Of the 20 digital control signal lines 17 are used for digital control signals as listed in Table 2 Of the 17 control signals 12 lines are used to load a 12 bit parallel voltage level control signal to a selected channel The other 5 lines are used for data traffic control Therefore a parallel output signal source such as a digital input output DIO board or computer parallel port is required to perform digital control An initializatio
7. re connector cleaning Note For interferometric applications make sure that all fibers are fixed in position and cannot move during measurement This can be done by taping them to the optical table 3 2 Operation The FST 001 B board can be operated under either analog or digital control modes These two modes cannot be operated at the same time unless one of the control signal groups is set to zero 3 2 1 Analog control mode operation To operate the FST 001 B in analog control mode a multi channel at least 4 channels DC or AC signal generator is required Typical signal sources are function generators DC power supplies digital analog converter output lines computer controlled analog output boards etc Analog signals can be applied to all channels simultaneously l Set the analog signal source at or near zero or its lowest output level Connect analog signal source to analog input connector on the rear panel use 10 pin input connector cable refer to Figure 1 for pinout diagram 2 Turn on the 12V DC power supply power switch on front panel Document GP UM FST 001 B 10 Page 7 of 9 5 Adjust voltage applied to the analog input connector to set voltage at the desired level The input analog signals are amplified by a factor of 30 Never apply a voltage higher than 5V to the FST 001 B Do not apply a negative input voltage to the FST 001 B In general the 12V current should be less than 1 0 A during continuous drive o
8. rol bit 2 6 DBO Digital signal least significant bit LSB 7 DBI Digital signal bit 2 8 DB2 Digital signal bit 3 9 DB3 Digital signal bit 4 10 DB4 Digital signal bit 5 11 DB5 Digital signal bit 6 12 DB6 Digital signal bit 7 13 DB7 Digital signal bit 8 14 DB8 Digital signal bit 9 15 DB9 Digital signal bit 10 16 DB10 Digital signal bit 11 17 DB11 Digital signal most significant bit MSB 18 DGND Digital ground 19 DGND Digital ground 20 NC Not connected Document GP UM FST 001 B 10 Page 6 of 9 Section 3 Operation Instructions Important Safety Notes The FST 001 B PCB board inside the enclosure can produce hazardous voltages and currents The DC voltage on the board can reach 150 V Never open the cover of the FST 001 B or touch any part of the board or cable connectors when electric power is on 3 1 Getting started Unpacking The FST 001 B is shipped with a 12V 1 25A AC DC power supply analog and digital input cables and user manual Initial setup 1 Plug in 12V DC power supply on the rear panel Connect analog or digital input cable to the appropriate analog or digital control signal source before connecting analog or digital input connectors to the FST 001 B 3 Connect input and output fibers to FST 001 B It is important to clean the fiber connectors using industry standard procedures before connecting them In the case of a high power laser source turn off optical power source befo
9. s the current rating If a sinusoidal waveform is used as a driving source the user should check Section 3 2 1 in this manual to make sure that the output voltage and driving frequency are within the designed safe operation range Document GP UM FST 001 B 10 Page 3 of 9 Section 1 Specifications Physical Features External analog input connector External digital input connector Max Ratings Max output voltage Max output current Max Input Signal Voltage Optical Characteristics Operating wavelength System insertion loss PDL Optical power handling Fiber Input Output Connectors Electrical Characteristics Input Analog Signal Voltage Range Input Resistance Digital input 140V Output Response Time 15V Output Response Time Output Voltage Range Output Impedance External Input Gain Noise 3dB Bandwidth Operating Temp Storage Temp Required Power Supply Standard 12VDC 1 2A Note 1 Measured without connectors 2 Per customer specification 3 The bandwidth is measured at 140V output with no load Any piezoelectric element added to the output may decrease the bandwidth The 3 dB bandwidth is defined by the frequency at which the output peak to peak voltage drops from 140 V to 100 V 0 707 x 140 V Document GP UM FST 001 B 10 10 pin AMP type with 0 1 pitch 20 pin AMP type with 0 1 pitch 140 VDC 20 mA channel all channels continuous 60 mA channel single channe
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