Description
Specifications
- Model: DM-181
-
Measurement Range: 1 µΩ to 19.999 kΩ (7 decimal ranges)
-
Display: 4½-digit bright LED
-
Accuracy: ±0.2% of reading, ±0.05% of range
-
Test Current:
• 2 A at lower range (19.999 mΩ)
• Approx. 0.1 A at higher ranges -
Reading Stability: High stability with noise-free output
-
Operation: Mains operated
-
Measurement Method: 4-terminal Kelvin arrangement
-
Zero Adjustment: SET ZERO knob provided
-
Suitable Wire Diameter: 0.1 mm to 10–15 mm copper/aluminium wire
-
Applications: Winding resistance, transformer coil testing, PT secondary resistance, conductivity & resistivity check
-
Standards Compliance: IS 5484:1997, IS 5082:1998, IS 2067:1975
-
Model: DM-181
Product Description
The Digital Micro-Ohm Meter DM-181 is a high-precision instrument engineered for ultra-low resistance measurement in electrical and industrial applications. Offering a wide range from 1 micro-ohm to 19.999 kΩ, this meter supports seven selectable ranges, delivering exceptional accuracy and stability for critical low-resistance testing.
Designed with a 4½-digit LED display, the DM-181 provides clear, highly resolved readings suitable for laboratory, manufacturing, and field environments. Its 2-ampere test current at lower ranges ensures precise measurement of extremely small resistances—ideal for applications where accuracy is essential.
4-Terminal Kelvin Measurement
The instrument uses a 4-terminal configuration to eliminate lead resistance errors, providing consistent and repeatable readings during wire, coil, and transformer testing.
Ideal for High-Current Components
The DM-181 is widely used for checking:
-
Transformer primary & secondary winding resistance
-
Potential transformer coil resistance
-
Contact resistance of switches, breakers & busbars
-
Resistivity & conductivity of copper and aluminium wires
-
Wire diameters from 0.1 mm up to 10–15 mm
Its stable measurement system ensures accurate temperature-rise calculations in transformer and PT testing.
User-Friendly Operation
The meter includes a SET ZERO knob for compensation, stable mains operation, and a selector switch for range adjustment. It delivers consistent readings even in demanding industrial environments.
Applications
-
Transformer winding resistance testing
-
PT/CT coil resistance measurement
-
Wire & cable conductivity testing
-
Busbar and switchgear contact resistance
-
R&D and QC laboratories
-
Electrical component manufacturing
