description Heathkit IM-18 Overview
The Heathkit IM-18 is a Heath Company vacuum-tube voltmeter kit introduced in 1968. It is an electronic test instrument for measuring DC voltage, AC voltage, peak-to-peak voltage, and resistance, with a high-input-impedance design intended to reduce loading of the circuit under test. The assembly manual describes it for servicemen, engineers, and maintenance workers, while its kit format also made it relevant to electronics hobbyists learning to build and service measuring equipment. [Heathkit IM-18](https://www.heathkit.nu/heathkit_nu_IM-18.html)
help Heathkit IM-18 FAQ
What can the Heathkit IM-18 measure?
The IM-18 measures positive and negative DC voltage, AC RMS voltage, AC peak-to-peak voltage, and resistance. It is a vacuum tube voltmeter designed for servicing and laboratory-style electronics work.
Why is the IM-18 useful around sensitive circuits?
The meter has a high input impedance, documented as 11 megohms on DC and 1 megohm shunted by capacitance on AC. That reduces the loading effect a conventional low-impedance meter could have on a circuit under test. [Heathkit IM-18 manual](https://manualzz.com/doc/23594045/heathkit-im-18-vacuum-tube-voltmeter-user-manual)
When was the Heathkit IM-18 produced?
The IM-18 came onto the market in 1968 and was produced until 1976. It belongs to Heathkit's classic vacuum-tube test-equipment period.
What does VTVM mean in Heathkit IM-18?
VTVM means vacuum tube voltmeter. The IM-18 uses vacuum tubes for rectification and amplification, which Heathkit specified as a way to achieve sensitivity and stable measurements.
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