CN2319814Y

CN2319814Y - Multifunctional pointer multimeter

Info

Publication number: CN2319814Y
Application number: CN 98212908
Authority: CN
Inventors: 苏重清
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-03-03
Filing date: 1998-03-03
Publication date: 1999-05-19
Anticipated expiration: 2008-03-03

Abstract

The utility model relates to a multifunctional pointer multimeter. In a common pointer multimeter, a C4 and a C 5 are added for being capable of measuring high-frequency signals; a D3, a C6 and an R13 are added for being capable of measuring audio signals; a TR1, a T1, etc. are added for being capable of outputting an audio signal; a TR2, a T2, etc. are added for being capable of outputting a high-frequency constant amplitude signal, and a high-frequency amplitude modulation signal can be output by utilizing the two signals. All the added function steps also use probes of original a pointer multimeter, and only a special concentric line is added on the signal output step. The added steps also use a common switching selector of a common pointer multimeter for conversion, and only one pole is used in a multipole switch without adding other switches. The utility model has the advantages of convenient operation, low cost, large range of the frequency and the amplitude of the measured high frequency signals and the measured pulse signals, and strong ability of signal output and has a model machine. Output high-frequency signals can directly driven a loudspeaker.

Description

Multi-functional pointer multimeter

The utility model is a kind of electronic surveying instrument.

Existing pointer multimeter can not be used for the measured frequency higher signal, have in addition survey non-power frequency component error and just obviously strengthen, though can survey high-frequency signal with external wave detector, it is inconvenient to compare; Though in pointer multimeter plus signal generator is arranged, and the terminal that is increased, switch number and cutter number are more, carrying load ability is not strong.Therefore make cost higher, use inconvenience.

The purpose of this utility model is to avoid the deficiency in the above-mentioned technology, when keeping common pointer function of multimeter and switch number and cutter number, increase therein and survey high frequency and pulse signal, output constant amplitude sound signal, output constant amplitude and amplitude modulation high-frequency signal function.

As shown in Figure 1, it is to increase C4, C5 dexterously to have constituted survey high frequency small signal circuit in existing pointer multimeter, increase C6, D3 and R13 and constituted audio frequency and pulse signal (frequency is immeasurable far above the common pointer multimeter of the power frequency) circuit that to survey high voltage, increase TR1, T1 etc. and constituted constant amplitude audio signal output circuit, increase TR2, T2 etc. and constituted constant amplitude high-frequency signal output circuit, constituted amplitude modulation high-frequency signal output circuit by above-mentioned constant amplitude audio signal output circuit and constant amplitude high-frequency signal output circuit.The shelves of these increases are the probe of shared former table still, and only signal output shelves have increased a special-purpose concentric line, and the also available single-pole double-throw switch (SPDT) of this line switches when output signal by negative test pencil replacement.

Many and existing multiple function apparatus is lower than cost than function, volume is little, connection terminal lacks for the utility model and existing pointer multimeter, simple to operate.

Fig. 1 is a circuit diagram of the present utility model.

Fig. 2 is a shape assumption diagram of the present utility model.

The position of the switch has as shown in Figure 1 kept the function of existing pointer multimeter, and its method of surveying voltage, electric current, resistance and triode repeats no more here with original the same.

During survey high frequency small-signal K is thrown the RFI shelves, D1, D2, C5 and C4 become measured signal into DC voltage and show for gauge outfit: when acoustic frequency and pulse signal K is thrown the VPP shelves, through D3 and C6 measured signal is become DC voltage for the gauge outfit demonstration.But whether this function decision circuitry vibrates, whether signal exists and bigness scale signal voltage peak value etc.

During output constant amplitude sound signal, K is thrown the AF shelves, emitter follower and C3 coupling output that signal constitutes via TR2.Its output is about 300mV _P-p, the signal source internal resistance is lower than 150 ohm, and its output frequency is about 2KHz.It can be used for injecting signal to audio or video circuit such as sound equipment or TVs, according to sound or image change failure judgement etc.

When output constant amplitude and amplitude modulation high-frequency signal K is thrown RF and AM shelves respectively, signal is via C3 coupling output.Its output is about 300mV _P-p, the signal source internal resistance is lower than 150 ohm.Its output frequency is about 465kHz, and wherein containing a large amount of higher hamonic waves can utilize.It can be used for injecting signal, fault location and calibration frequency etc. to radio intermediate frequency, high frequency or television video circuit.Because the positive feedback of the heavy more high frequency signal generator of load is strong more, the sound signal signal is exported through emitter follower, so the carrying load ability of signal generator is stronger.

Claims

1. multi-functional pointer multimeter, it is to increase part and the electronic surveying instrument that increases function in common pointer multimeter.It is characterized in that: constituted survey high frequency small signal circuit by electric capacity (CA, C5), diode (D1, D2); Constituted audio frequency and pulse (frequency is immeasurable far above power frequency, the common pointer multimeter) signal circuit that to survey high voltage by diode (D3), resistance (R13) and electric capacity (C6); Constituted constant amplitude audio signal output circuit by triode (TR1, TR2) and transformer (T1) etc.; Constituted constant amplitude high-frequency signal output circuit by triode (TR2) and transformer (T2) etc.; Constituted amplitude modulation high-frequency signal output circuit by above-mentioned constant amplitude audio signal output circuit and constant amplitude high-frequency signal output circuit.The shelves of these increases are the probe of shared former table still, and only signal output shelves have increased a special-purpose concentric line, and the also available single-pole double-throw switch (SPDT) of this line switches when output signal by negative test pencil replacement.

2. multi-functional pointer multimeter according to claim 1 is characterized in that: only just can select survey high frequency and audio signal circuit, the constant amplitude audio frequency that just can select, constant amplitude high frequency and the conversion of amplitude modulation high-frequency signal output gear and the conversion of signal generator power supply of conversion with single-pole switch (K).

3. multi-functional pointer multimeter according to claim 1, it is characterized in that: different frequency and the constant amplitude/conversion of amplitude-modulated signal output gear and the conversion of signal generator power supply just can be finished with same single-pole switch, and unlike signal is exported in same point.This is to make it use simple, cheap key factor.The deviser points out emphatically at this, and allowing without the deviser can not be with this design independent signal generator design that is used for other electronic device, instrument from this patent.

4. multi-functional pointer multimeter according to claim 1 is characterized in that: test cross stream voltage commutation is received switch (K) with the input point of diode (D1, D2) by electric capacity (C5), is parallel with high-frequency filter capacitor (C4) on the gauge outfit (M); The rectification circuit that has diode (D3) and electric capacity (C6) to constitute between concentric line and switch (K), it is exported by receiving gauge outfit (M) after resistance (R13, R6) and potentiometer (W) step-down.

5. multi-functional pointer multimeter according to claim 1, it is characterized in that: in the audio oscillator circuit that triode (TR1) and transformer (T1) etc. constitute, the collector of triode (TR1) is received when switch (K) is exported the constant amplitude high-frequency signal to allow can connect power supply and the audio oscillator circuit nonoscillatory thus.

6. multi-functional pointer multimeter according to claim 1, it is characterized in that: in the high-frequency oscillating circuits that triode (TR2) and transformer (T2) etc. constitute, the collector of triode (TR2) is received switch (K) can connect power supply and the high-frequency oscillating circuits nonoscillatory when allowing its buffering output audio signal thus.