The EICO Model 221 is a versatile Vacuum Tube Voltmeter (VTVM) designed for precise measurement of AC and DC voltages, as well as resistance. Manufactured by the Electronic Instrument Co. Inc. in Brooklyn, USA, this instrument was produced between 1951 and 1968.
Key Features
- Measurement Capabilities: The Model 221 offers a wide range of measurements, including AC and DC voltages from 5 to 1,000 volts, and resistance up to 1,000 megaohms.
- High Input Impedance: With an input resistance of 25 megaohms, it ensures minimal loading on circuits under test, providing accurate readings.
- Frequency Response: The device operates effectively within a frequency range of 20 Hz to 200 kHz, accommodating various applications.
- Accuracy: It maintains a measurement accuracy of ±5%, ensuring reliable data for critical tasks.
- Display: Equipped with an 11.5 cm analog meter, it provides clear and precise readings.
Design and Build
The Model 221 features a durable metal case, measuring 6 x 9.7 x 5 inches (152 x 246 x 127 mm), and weighs approximately 5.5 pounds (2.5 kg). Its robust construction ensures longevity and reliability in various working environments.
Power Requirements
This VTVM operates on an AC supply of 110-120 volts and requires a single 1.5-volt battery for certain functions, making it adaptable to different power sources.
Applications
The EICO Model 221 is particularly suited for use in television, FM, and AM radio servicing, as well as in laboratory settings where precise voltage and resistance measurements are essential.
With its comprehensive measurement capabilities and durable design, the EICO Model 221 remains a valuable tool for professionals and enthusiasts in the electronics field.
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