Summary of Contents for ND&M ACCUMULATING FRAMEGRABBER
- Page 1 & Neutron Detectors and more ... ACCUMULATING FRAMEGRABBER for the NEUTRON-HANDMONITOR Operating Instructions...
- Page 2 EUTRON ONITOR ANDMONITOR The ND&M Accumulating Framegrabber is a 16-bit ISA card (PC/AT card) that captures up to 256 video frames from a CCD camera and sums them up. Each video frame is discriminated before it gets summed up. Usually the Accumulating Framegrabber is used together with the ND&M Neutron Monitor (Handmonitor) and the ND&M Readout Unit, but it can also be operated standalone together...
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Page 3: Warranty
AUTIONARY OTES Please refer to the cautionary notes for the Handmonitor before operating the Accumulating Framegrabber, the Readout Unit and the Handmonitor. ARRANTY ONDITIONS The warranty period is 6 months after delivery date. Credit (prorata replacement) upon failure within 6 months. Please refer also to the warranty conditions for the Handmonitor. - Page 4 PC. We chose this address because it showed a very low probability of interfering with other cards. The Accumulating Framegrabber uses only 8 consecutive addresses in the I/O space of your PC and NO interrupts or DMA channels. Please check also that you really insert the...
- Page 5 Accumulating Framegrabber in a 16-bit slot. It won´t work in an 8bit slot. Mount the Handmonitor on the Readout Unit (please refer to the manual of the Readout • Unit if you have problems). Make sure that the Handmonitor is switched off. Start with a gain setting of ´2´ on the •...
- Page 6 ´ frame´ mode. ´ Frame´ mode, on the other side, gives a higher resolution and higher sensitivity. Overlapping frames are no subject for the Accumulating Framegrabber, because here the frames are summed up anyway.) The ´...
- Page 7 CCD Gain adjustment (RV301) CCD video board Fig. 3: Gain adjustment potentiometer inside the CCD camera of the Readout Unit...
- Page 8 1. Best signal-to-noise ratio. 2. Highest dynamic range. 3. Lowest nonlinearities. 4. Highest spatial resolution. If you are primarily using the Accumulating Framegrabber without discrimination and without further determining the locations of the scintillation events, consider the following: ADC Gain adjustment Fig.
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Page 9: Hardware Description
1. Now change the gain of the ADC until a few percent of the neutrons reach the saturation value. ARDWARE ESCRIPTION The block diagram of the Accumulating Framegrabber can be seen in fig. 5. There are essentially 3 blocks that are accessible by the user: the discriminator, the frame counter and the FiFo. - Page 10 14.3 MHz Fig. 5: Block diagram of the Accumulating Framegrabber For a demonstration of the workings of the Accumulating Framegrabber, let us look at a simple demonstration program that reads in the frame buffer and shows it on the video screen: /* AFGTEST.C:...
- Page 11 outportw(FGRES,0); /* Reset the FiFo */ erasefifo(); /* Erase the FiFo */ getframe(); /* Read in FiFo and display it */ GrSetMode(GR_default_text); /* Restore old graphics mode */ void getframe() unsigned short i, j; static unsigned short iline[512]; char *p; p=(char *)VBASE;...
- Page 12 256 x 40 ms = 10240 ms A read on this address retrieves the status of the Accumulating Framegrabber in bit 0 of the data word. Right after writing to FGINT, this bit 0 goes to zero. Shortly after this, the bit 0 goes to zero, thus indicating the begin of the integration time.
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Page 13: Pin Assignment
ONNECTOR SSIGNMENT Connector Type: 9-pin SUB-D PIN # Function GND Handmonitor GND Camera reserved +12V Camera +12V Handmonitor Sync out Video in reserved ECHNICAL PECIFICATIONS ADC resolution: 8 bits # of digitized pixels: 512 x 512 Pixel clock: 14.318 MHz Frame Buffer: 512 kByte Discriminator:...
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