For example: Agilent E4440A or Anritsu 68369
Amplifier
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Lecroy DA1822A Overview
The LeCroy DA1822A differential amplifier provides higher gain and differential voltage range than the DA1855A at lower bandwidth. It does not offer fast overtime recovery which is needed for switching-device saturation voltage measurements. The higher gain and additional bandwidth limit filtering options are ideal for measuring very low voltages, such as high current shunt resistors and characterizing power structure losses.