
( Brand: Heathkit ), ( Manufacturer Part Number: IM-38 ), ( Part Type: Vacuum Tube Meter ), ( Bundle Listing: No ), ( Country/region Of Manufacture: United States )
The IM-38 Heathkit AC Volt-Ohm-Milliammeter (AC-VTVM) is a comprehensive and versatile test instrument designed for electrical and electronic measurements. This vintage Heathkit product, with its timeless appeal and functional efficiency, is an excellent choice for hobbyists, DIY enthusiasts, and professionals who value precision and durability.
The IM-38 AC-VTVM is a true RMS device, capable of providing accurate readings for both AC voltage and current measurements. It features a 6-digit, high-resolution display that offers exceptional readability, even under low-light conditions. The meter offers a wide range of sensitivity, from 10 mV to 1000 V AC for voltage measurements, and from 10 mA to 10 A for current measurements.
The IM-38 AC-VTVM includes a built-in frequency counter, capable of measuring frequencies up to 10 MHz with an accuracy of 0.5%. It also features a resistance function, allowing you to measure resistance values between 0.1 and 100 M with an accuracy of 0.1%. Additionally, the meter includes a capacitance function, capable of measuring capacitance values between 0.01 F and 1000 F with an accuracy of 1%.
The IM-38 AC-VTVM is equipped with a large, easy-to-use front panel, featuring clearly labeled knobs and switches. It includes a variety of test leads and probes, as well as a built-in battery for backup power in case of power outages. The meter is housed in a sturdy, metal chassis, ensuring durability and longevity.
In summary, the IM-38 Heathkit AC Volt-Ohm-Milliammeter (AC-VTVM) is a versatile and reliable test instrument, ideal for a wide range of electrical and electronic measurements. Its high precision, extensive functionality, and durable construction make it an excellent choice for anyone looking for a reliable and long-lasting test instrument.
Pros of buying a IM-38 Heathkit AC Voltage-Voltmeter (AC-VTVM):1. Classic design and build: The IM-38 is a vintage Heathkit kit, which means it has a classic and sturdy construction that may appeal to hobbyists and collectors.
2. Manual operation: Since it is a vacuum tube voltmeter, it does not require batteries or any external power source. This can be an advantage for those who prefer manual operation and want to avoid reliance on electrical grids.
3. Learning opportunity: Building the kit can be a great learning opportunity for individuals who are interested in electronics and circuitry. It can also help improve problem-solving and troubleshooting skills.
4. Durability: Vacuum tube equipment is generally more durable and can last longer than modern electronic devices.
Cons of buying a IM-38 Heathkit AC Voltage-Voltmeter (AC-VTVM):1. Limited functionality: The IM-38 is a basic voltmeter and does not have the same range of features as modern digital multimeters. It may not be suitable for more advanced or specialized applications.
2. Complexity: Building the kit may be challenging for those who are not experienced in electronics or who are not familiar with Heathkit kits. The instructions may be difficult to follow, and there may be a learning curve involved.
3. Maintenance: Vacuum tube equipment requires more maintenance than modern electronic devices. Vacuum tubes can wear out over time, and the equipment may need to be serviced or repaired if it malfunctions.
4. Cost: While the kit itself may be relatively affordable, the cost of replacing vacuum tubes and other parts can add up over time.
Conclusion:The IM-38 Heathkit AC Voltage-Voltmeter (AC-VTVM) is a classic and durable device that can be a great learning opportunity for hobbyists and electronics enthusiasts. However, it has limited functionality and may require more maintenance than modern digital multimeters. If you are looking for a basic voltmeter or are interested in building a kit, the IM-38 may be a good option. However, if you require more advanced functionality or prefer a more user-friendly device, a digital multimeter may be a better choice.
Recommendation:If you are interested in building a kit and learning about electronics, the IM-38 Heathkit AC Voltage-Voltmeter (AC-VTVM) can be a great option. However, if you need a more advanced or user-friendly device, I would recommend considering a digital multimeter instead. There are many affordable options available on the market that can meet your needs while offering more functionality and ease of use.
The single range power switch knob is original, like new-no chips, no cracks and ranges are marked in voltage as well db. Each of these 10 steps is calibrated in Debs decibels as well volts . I purchased this ac vtvm in factory wired form to serve as a standard reference for the set-up and calibration of audio equipment all types am FM radio broadcast stations other measuring test.
The front of unit is in good condition there are no scratches, marks or cracks any type on panel meter. Most often used in audio work, these ac vtvm can also be as VI meters, however that is not their main purpose. It has lived in a controlled atmosphere non-smoking home since was purchased. The case and handle are in excellent condition as well with few if any scratches absolutely no rust or corrosion whatsoever, either inside out.
Instead they serve as test and set-up measurement instruments for audio equipment used speech music.
All of the lettering is perfect. The power on indicator is functional. No modifications have been made the meter is completely original as factory wired.
Likewise, no electronic repair work has ever been required on this unit. That's actually traditional with the well designed Heathkit line of equipment.
Heathkit IM-38 ac vacuum tube volt meter different than the usual vtvm, an vtvm is designed to measure voltage s only. They too are in great shape.
The tubes were purchased as spares, but their use has never been required. You might want to check it out if need good audio test equipment.
In the case of IM-38, ac voltage s from 10 Hz to 1mhz ten switch selected ranges Millie volts 300 volts . I pack really well and usually ship by ups ground service pay to have equipment fully insured for your protection. I am now in my mid 70, retired and no longer use this equipment so hope there is someone out who can enjoy fine meter. The ac vtvm has been completely cleaned, checked and tested.
The two vacuum tubes that are part of circuitry test well into good range.