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Dec 15
RF Power Amplifier &
Programmable Synthesizer
Including: Basic Deflector Alignment
Instruction Manual
RFA1170-4 + iMS4-L
Models -
RFA1170-4+iMS4-L
Tel: (703) 321 8301, Fax: (703) 321 8546, e-mail:
ISOMET (UK) Ltd, 18 Llantarnam Park, Cwmbran, Torfaen, NP44 3AX, UK.
Tel: +44 1633-872721, Fax: +44 1633 874678, e-mail:
: 50-90MHz, > 240W total RF output
DO NOT OPERATE
the RFA1170-4 types
LS700 type AO DEVICES
WITHOUT LIQUID COOLING
* (Always refer to the AO test data sheet)
ISOMET CORP, 5263 Port Royal Rd, Springfield, VA 22151, USA.
www.ISOMET.com
ISOMET
or
isomet@isomet.com
isomet@isomet.co.uk
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Summary of Contents for ISOMET RFA1170-4+iMS4-L
- Page 1 ISOMET CORP, 5263 Port Royal Rd, Springfield, VA 22151, USA. Tel: (703) 321 8301, Fax: (703) 321 8546, e-mail: isomet@isomet.com www.ISOMET.com ISOMET (UK) Ltd, 18 Llantarnam Park, Cwmbran, Torfaen, NP44 3AX, UK. Tel: +44 1633-872721, Fax: +44 1633 874678, e-mail: isomet@isomet.co.uk...
- Page 2 ISOMET GENERAL The Model RFA1170-4 is a class AB amplifier designed to drive the LS700- series of Isomet high power Germanium acousto-optic deflectors with up to 300Watts across a 40MHz bandwidth. When fitted with the iMS4-L synthesizer and controller cards, the RFA1170-4 power amplifier exhibits programmable phase shift and amplitude compensation capability across the four RF output channels.
- Page 3 ISOMET Figure 2 shows a block diagram of the Driver. The iMS4-L comprises two PCB’s Lower PCB features a four channel DDS and high speed FPGA with memory function. Upper PCB is the main I/O interface and includes the USB II connection to the host The -Enable signal is common to all four outputs.
-
Page 4: Installation And Adjustment
ISOMET INSTALLATION AND ADJUSTMENT For continuous or duty cycled operation above >2%, always connect cooling water. Flow rate greater than 2 litres / minute. Temperature < 20 deg.C (Factory fitted water connections suit 8mm OD plastic tubing). Connect +24V DC to the screw terminals of the filtered DC connector. DO NOT APPLY POWER. - Page 5 Bragg alignment difficult. It is therefore recommended that initial alignment be performed at a low RF power level. 3.10 RF power is adjusted under software control Please refer to the iMS SDK available at http://www.isomet.com/software.html 3.11 Set the power to a mid-level e.g. Class Method description...
- Page 6 PHASE and AMPL values to give the same efficiency at both positions. Fine tuning of the incident Bragg angle and RF power may be necessary for optimum results. 3.15 The amplifier is now ready for use. Please contact Isomet for further guidance and example programs...
- Page 7 ISOMET -Enable Response The -ENABLE (active LOW) should be applied 2msec prior to the required active RF output. The -Enable may remain LOW continuously. The RF amplifiers are design to be biased at 100% duty factor. T_DLY = 1.8msec -Enable (LVTTL)
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Page 8: Maintenance
ISOMET MAINTENANCE AO Device - Cleaning It is of utmost importance that the optical apertures of the deflector optical head be kept clean and free of contamination. When the device is not in use, the apertures may be protected by a covering of masking tape. - Page 9 ISOMET Schematic of Acousto-optic scanner and drive electronics. Intensity Modulation Tuning Voltage Deflector Driver Input Laser Beam BRAGG SCAN 1st Order Scan AO Deflector 0th Order The input Bragg angle, relative to a normal to the optical surface and in the plane of deflection is: ...
- Page 10 ISOMET Outline G1/8 Coolant Fittings Mounting Holes to suit 6mm O/D pipe 6mm diameter ( 2places) (4 places) USB II -Enable CTRL Model: ISOMET S/N : 0V +24V dc INT'L Connector Summary TNC, RF Output Ch1 TNC, RF Output Ch2...
- Page 11 ISOMET +24Vdc iM S 4 -L P A S ta g e iM S 4 -P F P G A T N C m ic ro-D B 2 5 O u tp u t P re -A m p M C X M C X...
- Page 12 ISOMET Signal Connector Spec -Enable Internal pull up to 3v3 Voltage free contact recommended Open = Off, Closed =ON CTRL 9-way D-type Reserved for future designs LVTTL, 3v3 max LVTTL, 3v3 max B-type 7-way Binder I2C (cable supplied) Screw terminal...
- Page 13 ISOMET Connection options for Beam Steered AO Deflectors Input Amplifier Increasing Phase Increasing Phase Delay Delay Input Amplifier Increasing Phase Delay Correct orientation as viewed from top of AOD (Connector identification may differ) Amplifier Increasing Phase Delay Input Amplifier Increasing Phase...
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