SP820

<body topmargin=0 leftmargin=0 marginheight=0 marginwidth=0> <table cellpadding=0 cellspacing=0 border=0><tr> <td valign="top" height=90 BGCOLOR="#006699" TEXT="#080000" background="1fcfd5a3.jpg"> <div> <FONT SIZE="5" COLOR="#000000" FACE="Arial" ><B>BIT Company</B></FONT><B>    </B><B> |     </B><A HREF="id83.htm" TARGET="_top" TITLE="Nuclear/Photometric Instruments"><U><B>Index</B></U></A></div> <div> </div> </td> </tr><tr> <td valign="top" height=390 BGCOLOR="#FFFFFF" TEXT="#080000"> <div> <B>SP820</B></div> <div> <B>Preamp/Discriminator</B></div> <bR> <div> <B><IMG SRC="29b90560.jpg" border=0 width="400" height="342" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></B></div> <bR> <div> <B>GENERAL DESCRIPTION</B></div> <bR> <div> <B>The MTB Associates model PC820 Preamplifier/Discriminator is a high sensitivity PMT processing system for photon counting applications. The preamplifier incorporates a high speed, low noise, FET input transimpedance design that is protected against high voltage transients. The discriminator utilizes a unique automatic pulse burst stretch compensation circuit to virtually eliminate base-line shift errors. In addition, the output incorporates a non-retriggerable MECL one-shot that can be adjusted ofer a range of 8 nanoseconds to 10 microseconds.</B></div> <bR> <div> <B>FEATURES</B></div> <bR> <div> <B>     - adjustable pole-zero cancellation          - easily adjustable tranimpedance</B></div> <div> <B>     - count rates to 50 million/second            - excellent gain and threshold stability</B></div> <div> <B>     - single point grounding                             - low power consumption</B></div> <bR> <div> <B>SPECIFICATIONS                                                                   </B></div> <bR> <div> <B>                       PREAMPLIFIER                                                                                         </B><B>DISCRIMINATOR</B></div> <bR> <div> <B>Input Impedance              50 ohms nominal                                        DC Restoration          Temperature compensated</B></div> <div> <B>                                                                                                                                                              clamp with automatic</B></div> <div> <B>Input Level - DC                2 KV maximum                                                                                   pulse burst stretch compensation</B></div> <div> <B>                      - Signal          100 microamps</B></div> <div> <B>                                                                                                                       Threshold                   0 to 50 microamps</B></div> <div> <B>Transimpedance               10 K ohms maximum                                                                       referenced to input</B></div> <div> <B>                                               User adjustable from 1 K to 10 K</B></div> <div> <B>                                                                                                                       Output Level              MECL compatible when terminated</B></div> <div> <B>Output Risetime                 Less than 5 nS                                                                                  in 91 ohms</B></div> <bR> <div> <B>Broadband Input Noise   25 nA (DC to 100 mHz,                              Output Pulse              </B></div> <div> <B>                                               input and output open circuit)                 Width                          8 nS minimum, internally   </B></div> <div> <B>                                                                                                                                      </B><FONT SIZE="3" COLOR="#000000" FACE="Arial" ><B>configurable to 10 microseconds</B></FONT></div> <bR> <div> <B>____________________________________________________________________________________________________</B></div> <bR> <div> <B>Pole-zero cancellation            35 microseconds to infinity, internally adjustable</B></div> <bR> <div> <B>Operating Temperature           -20 to +55 degrees C</B></div> <bR> <div> <B>Power Requirements              +12 volts at 105 mA, -12 volts at 95 mA</B></div> <bR> <div> <B>Weight                                        20 ounces (560 grams)</B></div> <bR> <div> <B>Size (L x W x H)                        4.13" x 2.68" x 3.16"</B></div> <div> <B>                                                     (10.5cm x 6.8cm x 8.0cm)</B></div> <bR> <div> <B>Power Connector                    Switchcraft 57HA3F. Mating connector 05CL3M supplied with unit.</B></div> <bR> <div> <A HREF="id17.htm" TARGET="_top" TITLE="Contact Us"><U><B>Contact us</B></U></A></div> <bR> <div> <B>Back to </B><FONT SIZE="3" COLOR="#0000FF" FACE="Arial" ><A HREF="id83.htm" TARGET="_top" TITLE="Nuclear/Photometric Instruments"><U><B>index</B></U></A></FONT></div> </td> </tr></table></body>