RPR-4000
Operations manual
REV 8-21 22
For optimal linearity and performance, the gain of the receiver should be adjusted
such that the output level is 1 V peak to peak when terminated into 50 Ω. Please
note that only the feature(s) of interest in the received signal should be in the
range. When you are doing pulse-echo measurements, the receiver output will be
saturated and over 1 V peak to peak during the burst.
When you are looking for return signals, it helps to increase the gain by 10 – 20
dB if you do not see anything at first. Once you have found your signals of
interest, set the receiver gain to the correct level before you begin any data
acquisition or digitizing.
5. Adjust the receiver filters (HP and LP, menu page 4)
If you need to work at higher gains, you can improve your signal to noise ratio by
lowering the low pass filter setting.
If you are doing pulse-echo measurements, you can make some improvements to
the recovery time of the receiver by increasing the high pass filter setting.
When first getting started with a new transducer-sample combination, some
experimentation will be required to optimize the settings of the instrument, and several
iterations of combinations of the above steps may be required. Once you have found
settings that are satisfactory, these can be saved in the internal memory. Please see
“Section 2: System Operation” subheading “Saving programs” for more details.
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