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The FDX is a diplexer designed to examine signals having harmonic frequency components of the transmitting pulse. Normally diodes are used in diplexer construction. When studying nonlinear phenomenon, this is unacceptable because diodes are very nonlinear components. Therefore, RITEC has designed a diplexer that protects the receiver from the high-power, low-frequency driving pulse while allowing the higher-frequency harmonics to be received. It is normally used for the odd harmonics because transducers are typically more sensitive to these frequencies. The FDX is designed for operation at a specific fundamental frequency that is specified by the user.
The RCDX-2A is a broadband (0.1 to 5 MHz) active device for allowing a single transducer to be used both for transmitting and receiving sound (pulse-echo). It protects the pre-amp input from the high-power output of a gated amplifier without loading the pulse, and also provides an efficient transfer of signal from the transducer to the receiver.
Active clamping of the diplexer input provides the required low impedance to more efficiently transfer the received signal from the transducer to the pre-amp input. The expected improvement in signal-to-noise ratio from the clamping action is 6 dB. A positive 5V pulse is required to turn off the clamp during the transmitting RF burst. The unit also requires power ( ± 8 V and ± 18 V), which is normally provided by a RITEC instrument.
Additional features have been incorporated to allow the user to optimize signals for a unique setup:
For low attenuation samples, there is a provision for bypassing the pre-amplifier.
The RDX-2 is a broadband (0.25 to 45 MHz) passive device for allowing a single transducer to be used both for transmitting and receiving sound (pulse-echo). It protects the receiver input (BR-640) from the high power output of the SP-801 square wave pulser without loading the pulse and also provides an efficient transfer of signal from the transducer to the receiver.
Additional features have been incorporated to allow the user to optimize signals for a unique setup:
The RDX-6 is a broadband (0.25 to 45 MHz) passive device for allowing a single transducer to be used both for transmitting and receiving sound (pulse-echo). It protects the receiver input from the high power output of a gated amplifier without loading the pulse, and also provides an efficient transfer of signal from the transducer to the receiver.
Additional features have been incorporated to allow the user to optimize signals for a unique setup:
The PAS-0.1-20 is a low-noise, broadband, high-impedance pre-amplifier designed to cover the frequency range of 0.1 to 20 MHz. The actual frequency range is significantly larger. The input impedance is 37.5 kOhm shunted by approximately 20 pF of capacitance. The total gain is switch selectable to 20, 30, or 40 dB. The output impedance is 50 W and will drive 1 V peak-to-peak (Vpp) into a matched load. ± 18 V power is normally supplied from a RAM system. However, the unit will work with ± 15 V supplies.
The RSD is an auto-transformer designed to handle the high powers produced using RITEC gated amplifiers. It is useful when using low-impedance loads such as electromagnetic acoustic transducers (EMATS). The voltage step-down ratio is selected as 2:1 or 3:1 (impedance ratio 4:1 or 9:1). A monitor output is provided to examine the output without damaging the oscilloscope input. The representative should be consulted to establish the desired frequency range.
The RSU is an auto-transformer designed to handle the high powers produced using RITEC gated amplifiers. It is useful when using high impedance loads such as some piezoelectric transducers. The voltage step-up ratio is selected as 1:2 or 1:3 (impedance ratio 1:4 or 1:9). A monitor output is provided to examine the output without damaging the oscilloscope input. The representative should be consulted to establish the desired frequency range.
The RS-5-G2 signal selector consists of an interface box that allows the user to determine which monitor is to be observed on channels one and two of the oscilloscope. Built into the interface are suitable terminations that allow the use of high-impedance inputs on the oscilloscope. All cables are included.
The RA-30 consists of three high-power attenuators that can be manually switched in or out. This allows the attenuation to be increased in 6-dB steps, up to a maximum of 30 dB. It is useful in reducing the output of a gated amplifier without distorting the shape of the RF burst. The RA-30 is capable of handling pulse power in excess of 5 kW and an average power dissipation of 5 Watts. Attenuation characteristics are maintained up to about 50 MHz with an accuracy of approximately 5 percent.
The RA-31 consists of three high-power attenuators that can be manually switched in or out. This allows the attenuation to be increased in 1-dB steps, up to a maximum of 7 dB. It is useful for stepping the output level of a gated amplifier for nonlinear measurements. The RA-31 is capable of handling pulse power in excess of 5 kW and an average power dissipation of 5 Watts. Attenuation characteristics are maintained up to about 50 MHz with an accuracy of approximately 5 percent.
The RA-32 consists of three high-power attenuators that can be manually switched in or out. This allows the attenuation to be increased in 8-dB steps, up to a maximum of 40 dB. It is useful in reducing the output of a gated amplifier without distorting the shape of the RF burst. The RA-32 is capable of handling pulse power in excess of 5 kW and an average power dissipation of a few Watts. Attenuation characteristics are maintained up to about 50 MHz with an accuracy of approximately 5 percent.
The RA-6 is a 6-dB, high-power attenuator capable of handling 1400 Volt peak-to-peak bursts at a duty cycle of 0.1%. This translates to a maximum average power level of 5 Watts.
The RT-50 consists of a high-power, 50-Ohm termination mounted in a box with a heat sink. It is used to terminate the gated amplifier output and preserve pulse fidelity when a high-impedance load is used. The RT-50 can also be used to terminate the high-power attenuators. It is rated for 1400 V peak-to-peak (Vpp) at a 0.2 % duty cycle. This translates to a maximum average power of approximately 10 Watts.
The TEM-128 consists of eight high-voltage capacitors, which may be switched in parallel with the electromagnetic acoustic transducer (EMAT) coil. This raises the typically low inductive impedance of the EMAT to a point where it can be more efficiently driven by a gated amplifier. This type of matching can improve the performance of many EMATs, especially if the EMAT has a significant inductive reactance. In many cases, however, more sophisticated matching circuits may be needed.
The REMP-128 consists of eight capacitors, which may be switched in parallel with a receiving electromagnetic acoustic transducer (EMAT). Resonating the EMAT coil is usually quite effective in raising the impedance and reducing the bandwidth. The low-noise pre-amplifier also plays an important role in preserving the signal-to-noise ratio. Power is usually supplied by a RAM system. See Application Notes.
The RHP is a multi-element high-pass filter capable of handling the high power outputs of RITEC gated amplifiers. It has value in reducing the distortion of high- frequency bursts as well as improving the recovery time of the receiver by removing very low-frequency components. The RHP is normally built to satisfy individual customer requirements.
The RHP is a multi-element low-pass filter capable of handling the high power outputs of RITEC gated amplifiers. It has value in reducing the distortion of bursts by removing harmonics and noise. The RLP is normally built to satisfy individual customer requirements.