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A  multimeter  or a  multitester , also known as a  volt/ohm meter  or  VOM , is an electronic measuring instrument that combines several measurement functions in one unit. A typical multimeter may include features such as the ability to measure voltage, current and resistance. Multimeters may use analog or digital circuits— analog multimeters  and  digital multimeters  (often abbreviated  DMM  or  DVOM .) Analog instruments are usually based on a microammeter whose pointer moves over a scale calibrated for all the different measurements that can be made; digital instruments usually display digits, but may display a bar of length proportional to the quantity measured. A multimeter can be a hand-held device useful for basic fault finding and field service work or a bench instrument which can measure to a very high degree of accuracy. They can be used to troubleshoot ele...

This is the RF Probe for Multimeter Circuit DiagramTo measure the RF voltage in a circuit to convert the signal unless they RF voltmeter. This conversion may be done with a very simple circuit, called a point or RF probe. A tip for RF Multimeter has to be made in a metal box with two connectors, one that receives the RF signal and another that goes to the multimeter.  In the case of this circuit the signal passes through two connectors between them and the RF signal is picked up.This signal passes through a 18 pF capacitor, a diode germanium, a resistor of 47 kOhm, and a bypass capacitor 33 nF. The anode of the diode is connected to the positive lead of the voltmeter and the other to ground. RF Probe for Multimeter Circuit Diagram