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The Leeds & Northrup 389171 Portable Potentiometer Indicator is a precision laboratory instrument used for accurate measurement of electromotive force (EMF), voltage, and thermoelectric potential. Designed for field and laboratory use, this unit was commonly employed in industrial calibration and scientific research throughout the mid-20th century. Model: 389171 Type: Portable Multi-Range Potentiometer Indicator Function: Measures low-level DC voltage and EMF with high precision using null-balance potentiometric principles Measurement Ranges: Typically 0–1.5 V, 0–150 mV, 0–15 mV, and sub-millivolt ranges depending on configuration Sensitivity: Microvolt-level detection accuracy Accuracy: ±0.02% of full scale (typical) Input Type: DC voltage (external reference cell or standard EMF source required) Standard Cell Compatibility: Designed for use with Weston standard cells for reference calibration Galvanometer: Built-in taut-band or moving-coil type null indicator for balance detection Controls: • Range Selector Switch • Coarse and Fine Balance Knobs • Polarity and Circuit Switches (T, S, P) Meter Type: Analog galvanometer with mirror scale for parallax-free reading Power Source: Self-contained (battery-operated reference circuit) or external DC source Enclosure: Handcrafted hardwood case with hinged lid and internal instruction chart Finish: Black anodized aluminum control panel with engraved labeling Dimensions: Approx. 12 × 8 × 7 in (305 × 203 × 178 mm) Weight: Approx. 10 lb (4.5 kg) Applications: Laboratory calibration, thermocouple EMF measurement, research in physical chemistry, and precision electrical metrology Manufacturer: Leeds & Northrup Company Country of Manufacture: USA (Philadelphia, Pennsylvania) Please review pictures carefully and let us know if you have any questions!
Condition: Used
Weight: 10.00
Depth: 12.00
Length: 12.00
Width: 12.00
SKU: 11340 4.S9.13.2
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