Buck M530 Manuals

1 Installation and Instruction Manual M530 Scanning Infra-Red Spectrophotometer April 2010 500-9999 Buck Scientific Inc. Norwalk, CT U.S.A. 2 Table Of Contents Section Page A Introduction & Description 3-4 B M530 Specifications 5 C Installation 6 D Preparation & Operation 7 E Parts Replacement 8 F Optical Diagram 9 G Computer Wiring Diagram 10 H Advanced Windows Computer Operation 11-13 I Instrument Software Manual for Grams v 9.0 14-19 J Grams/AI Software System Operation 20-23 K EZScan 2 Installation 24 L EZScan 2 Operation 25-26 M Sample Preparation Techniques 27-29 N Trouble Shooting 30-31 O Periodic Maintenance 32 P Fine Calibration 33 Q Buck Scientific Product Line 34 R M530 Shipping List 35 S Policy Statement 36 T Quick Walk Through 37-39 Quick Set-up for Buck Scan 3 SECTION A INTRODUCTION AND DESCRIPTION Introduction: The BUCK M530 is a single beam, microprocessed, ratio recording spectrometer. Pre-sample chopping and stepper motor controlled wavelength drive give results unattainable from conventional double beam, optical nulling systems. Clean single beam design and microprocessor control, make operation simple and maintenance costs low. Technical: Simple switch-mode computer power supplies run the system board and a 2.8 volt d.c. regulated source. The four element nichrome source operating at 1025º C with a ceramic isolator improves stability after initial warm-up. (1 hour recommended) The pre-sample chopping at exactly 354 r.p.m. (23.6 c.p.s.) controls phasing and prevents re-radiation of the sample, resulting in minimal spectral interference. The two optics to the right of the sample compartment condense and focus the source image through the full size sample compartment. The light goes through the entrance baffle and onto one of the four cut-on filters that keep higher orders of light from entering the monochromator. From the entrance slit, light goes to the first collimating mirror which directs the light onto the grating. The 75 line per millimeter grating disperses the light and sends it to the second collimating mirror. The second collimator focuses the light through the exit baffle and slit. The ellipse focuses the energy down to a 1mm by 2mm target DLATGS detector on the pre-amp board. The analog signal is sent to the main system board to be filtered, amplified and microprocessed. At the scan speed of three minutes, in the reference mode, 4250 data points are stored into the RAM chips. These data points are digital numbers between 0 and 4096, one for every .8 wavenumbers between 4000 and 600. After resetting, the 530 is ready for a sample. It takes each sample number for that frequency and divides it by the reference number and multiplies it by 100. (when in %T ). Example; 20 ratio to 40, times 100 is 50 %T. Gain can be increased above 1 for high energy loss samples, but you don't want to overload the memory or resolution will be lost. In ratio mode the M530 is set to give %T or Abs. All information coming out of the RS-232 or USB plug is in raw single beam unprocessed form even when the display says ratio. The GRAMS/AI, EZ-Scan or BuckScan computer programs perform all ratio operations (and conversion to Abs. if desired). The Measuring System: The scan drive, chopper motor and A-to-D converter are operated synchronously to eliminate scan-to- scan variations of spectral output data. Timing is derived from a crystal controlled clock in the microprocessor. A single data value is obtained from each chop cycle or scan step. The scan motor will step 4, 2, 1 or 1/2 times for each chopper cycle, corresponding to scan periods of 3, 6, 12 or 24 minutes. One scan step at the 3 min. scan speed will therefore equal 0.8 wavenumbers. Active, multiple, anti-aliasing filters are used before data acquisition; the data acquisition system retains all of the signal-to-noise data from the pre-amp output signal. The A-to-D uses a single, multiplexed 14 bit converter. The A-to-D function is achieved by successive approximation.