Model PM-35A General Purpose Differential Input Meter

The PM-35A is a popular, general purpose 5VDC powered in stru ment. More than 60,000 units have been installed through out the world in thousands of different applications, attesting to the meter’s utility and reliability. A single CMOS/LSI dual slope autozeroing analog to digital converter is used and the unit measures true differential for single-ended DC volt ages over five user programmable ranges from ±199.9mV to ±1200V full scale. Provision has been made for many user selectable operating modes, including a current meter, ratiometric ohmme ter, and a tem pera ture meter. An on board DC to DC converter provides up to 10mA of auxiliary power for external user circuitry. The differential input capability of the PM-35A is particularly useful for making accurate measurements of very small signals in the presence of much larger common mode signals. The PM-35A is ideal for meas ur ing various balanced transducers and bridge inputs and long term drift of the excitation voltage can be compensated for by using the external reference differential ratiometric mode of operation.