description Heathkit IM-13 Overview
The Heathkit IM-13 is a kit-built vacuum-tube voltmeter intended for service benches and electronics testing. Its functions include measurement of positive and negative DC voltage, AC voltage, and resistance; the instrument provides seven main voltage ranges from 1.5 to 1,500 volts and uses a high-input-resistance electronic circuit to reduce loading of the circuit under test. A combination AC-OHMS-DC switching probe simplifies connections for technicians, engineers, and maintenance workers. [IM-13 manual](https://manualzz.com/doc/23214016/heathkit-im-13-vacuum-tube-voltmeter-user-manual)
help Heathkit IM-13 FAQ
What is the Heathkit IM-13?
The IM-13 is a Heathkit vacuum-tube voltmeter designed for bench work in electronics servicing and repair. It was produced during roughly 1964 to 1968 and uses an analog meter rather than a digital display.
What can the Heathkit IM-13 measure?
The IM-13 measures AC voltage, positive and negative DC voltage, and resistance. Its manual lists seven voltage ranges from 1.5 volts to 1,500 volts and an input resistance of 11 megohms. [IM-13 manual](https://manualzz.com/doc/23214016/heathkit-im-13-vacuum-tube-voltmeter-user-manual)
Why use a vacuum-tube voltmeter instead of a basic analog meter?
The IM-13's 11-megohm input resistance places less load on high-impedance circuits than many older low-resistance meters. That makes it useful for vintage radio and amplifier work where the measuring instrument can otherwise alter the voltage being tested.
Is a vintage IM-13 safe to plug in immediately?
No, an unrestored IM-13 should be inspected before power is applied because it contains mains wiring, aging capacitors, and a high-voltage tube circuit. Check the power cord, electrolytics, probe, fuses, and calibration before using its 1,500-volt range.
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