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RITEC
BROADBAND RECEIVER
MODEL BR-640A
OPERATION MANUAL
TABLE OF CONTENTS
SECTION I .................................................................... Introduction
SECTION II.....................................................................Description
SECTION III................................................................Specifications
SECTION IV ...................................... Placing the Unit in Operation
Appendix W ........................................................................ Warranty
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Summary of Contents for RITEC BR-640A
- Page 1 RITEC BROADBAND RECEIVER MODEL BR-640A OPERATION MANUAL TABLE OF CONTENTS SECTION I ..............Introduction SECTION II..............Description SECTION III..............Specifications SECTION IV ........Placing the Unit in Operation Appendix W ................ Warranty...
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Page 2: Section Iintroduction
(20 microvolts RMS) will be equal to the equivalent noise input of the receiver. Special attention has been paid to the recovery time in the BR-640A. It is protected against direct pulse inputs of up to 400 V peak with a duty cycle of 0.05%. Control of the receiver bandwidth is provided through three selectable high pass filters and three selectable low pass filters. - Page 3 The SP-801 square wave pulser meets this requirement because its output impedance is clamped during the off time to 4 to 5 Ohms. Ritec diplexers transfer almost all of the available pulser energy to the transducer and approximately 90% of the received signal level to receiver, when used with a SP-801 square wave pulser.
- Page 4 +4dB setting. However, there will be a change in the propagation time through the BR-640A as the gain stages are switched in and out; typically this is a small effect and is typically only noticeable in phase sensitive operating configurations.
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Page 5: Section Iii Specifications
SECTION III SPECIFICATIONS Receiver Bandwidth ....................100 kHz to 50 MHz (-3dB points) Gain Control Range..........................79 dB Gain Control steps (±0.2dB maximum) ............4 dB steps on the rotary control .................. 1 dB or 2 dB through the switched attenuators Minimum Receiver Gain ........... - Page 6 Additional information on the function and use of diplexers appears in the Model SP- 801 square wave pulser manual, and the RDX-2 diplexer. If the BR-640A is to be used with a gated amplifier such as the GA-2500 or the GA-10000, more information is available in the...
- Page 7 Appendix P External Power Output Connectors There is an auxiliary power connector located on the front panel of the BR-640A receiver to power peripherals such as a preamplifier. For safety reasons, the connector on the instrument is a female polarity, typically 5 pins. With a powered peripheral, we will supply a 7-pin connector with a male end and a 5-to-7 pin adapter cable.
- Page 8 The male connectors on the end of the power cable and the preamplifiers and clamped diplexers are shown as follows: +18V -18V not used +48 V MALE FROM OUTSIDE -18V +18V -8 V not used +48 V +8 V MALE FROM INSIDE...
- Page 9 CHANGING POWER ENTRY MODULE VOLTAGE SETTING The correct power line voltage should be supplied to the AC power entry module, which is mounted on the rear of the unit. Different line voltages can be accepted by properly setting a small circuit board mounted in the module. Access to this board is provided by removing the plastic cover plate on the module by gently prying out one edge with a small screwdriver.
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Page 10: Warranty
Any recommendations made by RITEC for use of its products are based upon tests believed to be reliable, but RITEC makes no warranty of the results to be obtained. This warranty is in lieu of all other warranties, expressed or implied, and no representative or person is authorized to represent or assume for RITEC any liability in connection with the sale of our products other than set forth herein.
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