RPR-4000
The Ritec RPR-4000 is a high power ultrasonic measurement system designed for the non-destructive evaluation of material properties. It allows reproducible measurements using short (down to single cycle) radio frequency tone burst excitations in composites and other difficult materials.
The RPR-4000 provides high power RF tone burst excitations up to 8 kilowatts, providing ability to drive inefficient transducers, such as electromagnetic acoustic transducers (EMATs) or high capacity, low frequency piezoelectric transducers. The low noise broadband receiver has a gain control range of 20 to 100 dB and very low distortion, and is therefore ideally suited for receiving weak ultrasonic signals as those generated by EMATs. All RITEC high power products are protected against over current and over voltage to protect the instruments in case of transducer or wiring failures. The RPR-4000 has an integrated front panel display and keypad for operation without an external control computer, or it might be controlled by a PC via the RS-232 interface.
Pulser Unit
| Low Frequency Type | Standard Type | |
|
RF frequency (sin-wave tone burst) |
50 kHz ... 2 MHz | 200 kHz ... 20 MHz |
| Output power |
50 kHz ... 1 MHz: 8 kW 2 MHz: 5 kW |
200 kHz ... 2 MHz: 8 kW 3 MHz: 5 kW 8 MHz: 1.25 kW 20 MHz: 100 W |
| Max. pulse width | 200 µs | |
| Max. duty cycle | 1 % | |
| Trigger source | Internal, external, or by computer (RS232) | |
| Internal repetition rate setting | 0.08 Hz ... 10 kHz in 42 steps in 1, 1.25, 1.5, 1.6, 2, 2.5, 4, 5, 8, 10 sequence | |
| External trigger in | Positive TTL | |
| Trigger output | Positive TTL | |
| External RF signal input | 1V peak-to-peak, 50 Ω impedance | |
| Protection circuit | Protected agains over current, over voltage, over temperature. Visual and acoustic alarm. | |
Receiver Unit
| Low Frequency Type | Standard Type | |
| Frequency range |
50 kHz ... 2 MHz | 200 kHz ... 20 MHz |
| Low pass filter | 0.2, 0.8, 1.6 and 22 MHz | 2.5, 5, 10 and 22 MHz |
| High pass filter | 50, 200, 400 and 800 kHz | 0.2, 0.4, 0.8 and 22 MHz |
| Number of input channels |
2 low noise inputs | |
| Input impedance |
50 Ω | |
| Total gain |
20 ... 100 dB | |
| Gain control |
80 dB in 0.4 dB steps | |
| Signal output level |
Linear output 1V peak-to-peak into 50 Ω. Maximum output level 6 V peak-to-peak. |
|
| Output impedance | 50 Ω | |
| Pulse output monitor | -40 dB (50 Ω impendance) | |
General Characteristics
| Low Frequency Type | Standard Type | |
| Power requirements |
AC 85 ... 240 V, 50 ... 60 Hz, 300 VA | |
| Dimensions | 483 × 127 × 432 mm (W × D × H) | |
| Weight | 16 kg | |
RPR-4000-HP High Power
The recently released RPR-4000-HP high power system allows driving EMAT applications with an RF power of up to 15 kW RMS. 2500 Vp-p / 50 Ω, 15 kW RMS with a 0.3% duty cycle are possible. The frequency range covers 20 kHz … 3 MHz. An even more powerful unit delivering up to 20 kW RMS is under development.
