Heathkit Virtual Museum




  • Single AC/ohms/DC probe with switch
  • 7 AC, 7 DC & 7 ohms ratings
  • Easy-to-read 4½" 200 ua meter
  • 1% precision resistors for high accuracy
  • Extended low end only frequency response ± 1 db from 25 cps to 1 mc.

Here's the World's Largest Selling VTVM now in a brand new, handsomely styled package with improved performance and extra convenience

No basic service instrument has contributed more to the field of electronics than the world-famous Heathkit VTVM. Its quality and performance at low cost have made it a favorite for years and now with improved styling, better low-frequency response and single test-probe convenience, it presents an even greater value than before.

Now designated the IM-11, it features the same basic trouble-free circuit of the time-proven Heathkit V-7A with new improvements. Functions include AC volts (RMS), AC volts (peak to peak), DC volts, resistance and db measurements. Improved response now reaches down to 25 cycles for those important low frequency tests. Precision 1% resistors and the high 11 megohm input resistance of the IM-11 assures high accuracy in every application by minimizing circuit loading of the unit under test. A large 4½" 200 microampere meter is used for indication with clear, sharp calibrations for easy reading of all measurements. Front panel controls include a rotary function switch (with DC polarity reversing position to eliminate lead switching when alternately measuring positive and negative voltages), a rotary range selector, zero adjust and ohms adjust controls. Zero and ohms adjust controls feature small phenolic shaft knobs to minimize accidental change in setting.

The new slim, all-purpose test probe is used for all measurements. A switch on the probe body provides simple selection of AC-ohms or DC functions and is equipped with a hook which enables clipping the probe to the circuit for "hands free" operation. A component circuit board assures stable, uniform circuitry and easy assembly. Test leads and battery included.

SPECIFICATIONS—Meter scales: DC & AC (RMS): 0-1.5, 5, 15, 50, 150, 500, 1500 volts full scale. AC peak-to-peak: 0-4, 14, 40, 140, 400, 1400, 4000. Resistance: 10 ohm center scale at x1, x10, x100, x1000, x10K, x100K, x1 meg. Measures .1 ohm to 1000 megohms with internal battery. Meter: 4½" 200 ua movement. Multipliers: 1% precision type. Input resistance DC: 11 megohms (1 megohm in probe) on all ranges. Circuit: Balanced bridge (push pull) using twin triode. Accuracy: DC ± 3%, AC ± 5% at full scale. Frequency response: ± 1 db, 25 cps to 1 mc (600 ohm source). Tubes: 12AU7, 6AL5. Battery: 1.5 volt, size "C" flashlight cell. Power requirements: 105-125 volt 50/60 cycle AC 10 watts. Dimensions: 7 3/8" H x 4 11/16" W x 4 1/8" D. Shipping Weight: 5 lbs.

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