Com-Power model PAL-010 Preamplifier is intended for improving measurement system sensitivity during EMC compliance testing.. It has a frequency range of 100 Hz to 30 MHz.. It has gain of 28 dB gain . Therefore, It amplifies the signals that were previously hidden below the receiver noise floor of the EMI receiver so that it can be seen and measured. The PAL-010 has a gain variation of ±2.5 dB for the entire frequency range to reduce measurement errors. It can be powered by the rechargeable NimH batteries included when an external power source is not available.