Resistance Measurement System
#resistance measurement
#multimeter
#ohmmeter
#precision measurement
#analog circuit
#voltage divider
#sensor calibration
#test equipment
#electronic measurement
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Window-detector
The detector circuit compares the output voltage of two separate voltage dividers with a fixed reference voltage. The resultant absolute error signal is amplified and converted to a logic signal that is TTL compatible.
The described detector circuit serves as a...
5-Range Linear-Scale Ohmmeter
Rx is placed in the feedback path of IC1. A known reference current is chosen from the reference voltage generator Q1, D1, and resistors R5 through R9. A meter reading will be displayed, where R^ represents Rs through R9, as...
High voltage ohmmeters
Most ohmmeters of the design shown in the previous section utilize a battery of relatively low voltage, usually nine volts or less. This is adequate for measuring resistances under several mega-ohms (MΩ), but when extremely high resistances need to be...
Linear Resistance Meter
Most analog multimeters are capable of measuring resistance over a wide range of values, but they can be inconvenient to use due to the reverse reading scale, which is also non-linear.
Analog multimeters, often referred to as VOMs (Volt-Ohm-Milliammeter), are versatile...
Resistance-to-voltage converter
The circuit accurately measures up to 20M when used with a buffer amplifier (Al) that has a low input bias current (IiN) of less than 30 nA. It utilizes two of the three amplifiers found in the Siliconix L144 micropower...
How to Add Auto Turn-Off to a Multimeter
Most multimeters today have an auto turn-off feature built in. There is enough space in a multimeter enclosure, so why not install a simple circuit that...
A multimeter's auto turn-off feature is designed to conserve battery life by shutting down the...
Multimeter Shunt
The current range in multimeters, especially the more affordable models, is limited by the load capacity of the internal shunts to 1 to 2 A. A precision heavy-duty resistor from manufacturers such as Dale or RCL (0.1 Ω; 20 W;...
Regulated voltage divider
Integrated circuits (ICs) that require 3 or 6 volts can be powered from a battery or a fixed regulated supply with a higher voltage using the circuit illustrated. It is essential to mount the transistor on a heatsink, as significant...
Linear scale ohmmeter
A single preset resistor is utilized across all measurement ranges, which simplifies the setup process. Diode clamping is incorporated to protect the meter from damage if the unknown resistor exceeds the selected range. When the meter is assembled, a 10...