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"Dipmeter" could also refer to an influential early commercial expert system called Dipmeter Advisor; or may refer to an instrument that measures the "dip angle" of the planet's magnetic field, the field line angle in a vertical plane.
A dipmeter and several accessory probe coils. (Mitamusenkenkyūsho 三田無線研究所株式会社 DELICA DMC-230S2)
Two Heathkit Grid Dip Meters with a set of tuning coils.

Grid dip oscillator (GDO), also called grid dip meter, dip meter, dipmeter, or just dipper, is a measuring instrument to measure resonant frequency of radio frequency circuits. It measures the amount of absorption of a high frequency inductively coupled magnetic field by nearby objects. It is an oscillator whose amplitude changes when near a resonant circuit which is tuned to the frequency the oscillator generates. At the heart of the instrument is a tunable LC circuit with a coil that serves as a loose inductive coupling to the measured LC resonant circuit. Resonance is indicated by a dip in the meter indicator on the device, usually based on a microammeter.

## History

Grid dip oscillators were first developed in the 1920s, and were built with vacuum tubes. The devices measured the value of the tube's grid current. Modern grid dip oscillators are solid-state devices and are more versatile. Solid-state versions of the grid dip oscillator are sometimes called gate dip oscillators or emitter dip oscillators in reference to the parts of the semiconductor whose current is being measured instead of the grid current on a vacuum tube.

## Principle of operation

Oscillator portion of the schematic

Central to the circuit is a variable frequency oscillator with interchangeable coil and tuning capacitors (ganged) as shown. When the oscillator's coil is in the vicinity of another resonant circuit, the pair behaves as a low Q transformer, especially if the respective resonant frequencies match; this affects the frequency and amplitude of oscillation of the GDO, which is sensed in any of several ways, the simplest of which is to attach an ammeter.[1]

## Applications

Grid dip oscillators have been widely used by amateur radio operators for measuring the properties of resonant circuits, filters, and antennas.

 2523 videos foundNext >
 #52: Tutorial / Basics of a Dip MeterThis video presents the basics of a Solid State Dip Meter, which is the more "modern" equivalent of the old classic Grid Dip Meter (GDO). The GDO was simply a vacuum tube based oscillator... Ham Nation 149: How to Use Your Grid Dip MeterGrid Dip Meters and audio mixers explained! GRID-DIP METER BM342A - GDO MFJ Presentation: Using MFJ-269 as a Grid Dip MeterAn Evening with Martin F. Jue: MFJ's Antenna Analyzers Using the MFJ-269 as a Grid Dip Meter at Ga Tech, February 25, 2010 Hosted by the Atlanta Radio Club (W4DOC) and the Ga Tech Amateur ... Checking Coaxial Cable Traps Using the MFJ Grid Dip Meter AdapterHow to use the MFJ grid dip meter adapter to check coaxial cable traps. Traps are used in the making of some multi-band amateur radio (ham radio) antennas. Leader LDM 810 Grid Dip MeterThe LDM 810 is One of many grid dip meters that have been made over the years. Grid Dip Oscillator, fixing a dirty pot.In this video I show how you can use WD-40 to fix a dirty potentiometer, but note that the beneficial results improve with time. Grid Dip Oscillator, fixing a dirty pot. Grid Dip MeterDemonstration einer Resonanz bei 12MHz mit einem Parallelschwingkreis und einem Griddipmeter. Grid-Dip-Meter Neon modulation Testvacuum tube grid dip meter. using 6AK5. DIY: Grid Dip MeterSave on amazon using this link http://www.amazon.com/?tag=23b8j-20.
 2523 videos foundNext >
 1 news items
 Eric Nichols, KL7AJ, Selected as 2014 Bill Orr, W6SAI, Technical Writing Award ... ARRL Tue, 03 Feb 2015 10:11:15 -0800 “Eric's article was chosen, because it did an outstanding job of explaining how to use a device — the grid dip oscillator — that has been somewhat forgotten by many amateurs,” said Steve Ford, WB8IMY, QST Editor in Chief and ARRL Publications Manager.
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