The Keithley 5155 Meghohm Resistance Standards provide discrete reference sources with traceability to the National Institute of Standards and Technology. The 5155 consists of six individually encased resistors in thermal-lagged enclosures. The resistances are terminated with BNC connectors for easy interface and provision for shielding and/or guarding. A certificate is included giving actual values and test conditions at the time of measurements.
There are two versions of the 5155 that are available from Keithley; 5155 (Gray Casing) and 5155 (Black Casing): 5155 (Gray Casing) Six standard resistors with nominal values from 10 MOhm through 1TOhm in decade steps. 5155 (Black Casing) Six standard resistors with nominal values from 100 MOhm through 10 TOhm in decade steps.