Tektronix TPA-N-PRE External Preamplifier, TPA Connector, SMA InputThe Tektronix TPA-N-PRE preamplifier accessory for the MDO4000 and MDO3000 Series Mixed Domain Oscilloscopes provides 12 dB nominal gain, further lowering the already low noise floor in the MDO4000 and MDO3000 Series. This allows you to pull very small signals out of the noise in low-amplitude signal applications. For example, in the following screenshot we are measuring a noise floor of -114 dBm (-154 dBm/Hz) without the TPA-NPRE preamplifier. It appears that there is only noise present. Features and Specifications of Tektronix TPA-N-PRE includes: 

• Tektronix TPA-N-PRE - Datasheet (204 KB)