CN204177861U

CN204177861U - A kind of precisely numerical monitor ac millivoltmeter

Info

Publication number: CN204177861U
Application number: CN201420671324.3U
Authority: CN
Inventors: 帅建平
Original assignee: Chongqing College of Electronic Engineering
Current assignee: Chongqing College of Electronic Engineering
Priority date: 2014-11-10
Filing date: 2014-11-10
Publication date: 2015-02-25
Anticipated expiration: 2024-11-10

Abstract

The utility model discloses a kind of precisely numerical monitor ac millivoltmeter, comprise power module and signal attenuation module; Described signal attenuation module is connected with range handover module, signal amplification module, RMS conversion module, analog-to-digital conversion module and one-chip computer module in turn; Described one-chip computer module is also connected with display module and range indicating module; Described power module is connected with range indicating module with range handover module, signal amplification module, RMS conversion module, analog-to-digital conversion module, one-chip computer module, display module; The utility model greatly reduces measuring error, improves measuring accuracy, simultaneously by automatically selecting range, brings great convenience to circuit designers.

Description

A kind of precisely numerical monitor ac millivoltmeter

Technical field

The utility model relates to technology of instrument and meter field, is specifically related to a kind of precisely numerical monitor ac millivoltmeter.

Background technology

Along with improving constantly of socioeconomic development and scientific and technological level, various electronic and electrical equipment emerges in an endless stream, and especially various portable set comes out in a large number; Because the circuit of various electronic and electrical equipment must need to use ac millivoltmeter in design and debugging, current ac millivoltmeter is mostly pointer type alternating current millivoltmeter, but pointer type alternating current millivoltmeter exists, and measuring error is large, precision is not high, can not automatically switch gear, and there is artificial large according to scale reading error shortcoming, bring inconvenience therefore to circuit designers or user.

Summary of the invention

For the problems referred to above, the technical problems to be solved in the utility model is to provide that a kind of measuring error is little, precision is high, can according to input voltage size automatic switching range, and measuring voltage can the accurate numerical monitor ac millivoltmeter of numerical monitor simultaneously.

Accurate numerical monitor ac millivoltmeter of the present utility model, comprises power module and signal attenuation module; Described signal attenuation module is connected with range handover module, signal amplification module, RMS conversion module, analog-to-digital conversion module and one-chip computer module in turn; Described one-chip computer module is also connected with display module and range indicating module; Described power module is connected with range indicating module with range handover module, signal amplification module, RMS conversion module, analog-to-digital conversion module, one-chip computer module, display module.

Further, described power module is made up of bridge rectifier chip D1, the first voltage stabilizing chip VR1 and the second voltage stabilizing chip VR2 cascade.

Further, described signal attenuation module is made up of the first resistance R1, the second resistance R2, the 3rd resistance R3, the 4th resistance R4 and the 5th resistance R5 successively cascade.

Further, described range handover module is by the first relay K 1, second relay K 2, the 3rd relay K 3, the 4th relay K 4 with the 5th relay K 5 is parallel with one another forms.

Further, described signal amplification module is made up of the first amplifier U1 and the second amplifier U3 cascade.

Further, described RMS conversion module is made up of RMS conversion chip U5 and peripheral 16 resistance R16 and the 14 electric capacity C14.

Further, described analog-to-digital conversion module is made up of A/D chip U2 and peripheral 17 resistance R17.

Further, described one-chip computer module is made up of singlechip chip U4.

Further, described display module is made up of liquid crystal display J1 and the 18 resistance R18.

Further, described range indicating module is made up of connect one by one the 19 resistance R19, the 20 resistance R20, the 21 resistance R21, the 22 resistance R12 and the 23 resistance R23 of the first light emitting diode D9, the second light emitting diode D10, the 3rd light emitting diode D11, the 4th light emitting diode D12 and the 5th light emitting diode D13.

The utility model beneficial effect: a kind of measuring error of the present utility model is little, precision is high, can according to input voltage size automatic switching range, measuring voltage can the accurate numerical monitor ac millivoltmeter of numerical monitor simultaneously; When the utility model is started working, one-chip computer module controls range handover module and is in maximum range, after input signal is decayed by attenuation module, send into range handover module, and then send into one-chip computer module by signal amplification module, RMS conversion module and analog-to-digital conversion module successively; As input signal is too small, one-chip computer module then controls range handover module and successively reduces range, after choosing suitable range, single-chip microcomputer is shown in display module after then being changed by the signal received, and drives range indicating module to indicate current selected range; The utility model greatly reduces measuring error, improves measuring accuracy, simultaneously by automatically selecting range, brings great convenience to circuit designers or user.

Accompanying drawing explanation

For ease of illustrating, the utility model is described in detail by following concrete enforcement and accompanying drawing.

Fig. 1 is schematic block circuit diagram of the present utility model;

Fig. 2 is the circuit theory diagrams of power module;

Fig. 3 is the circuit theory diagrams of signal attenuation module;

Fig. 4 is the circuit theory diagrams of range handover module;

Fig. 5 is the circuit theory diagrams of signal amplification module;

Fig. 6 is the circuit theory diagrams of RMS conversion module;

Fig. 7 is the circuit theory diagrams of analog-to-digital conversion module;

Fig. 8 is the circuit theory diagrams of one-chip computer module;

Fig. 9 is the circuit theory diagrams of display module;

Figure 10 is the circuit theory diagrams of range indicating module.

Embodiment

The accurate numerical monitor ac millivoltmeter of one as shown in Figure 1, comprises power module and signal attenuation module; Described signal attenuation module is connected with range handover module, signal amplification module, RMS conversion module, analog-to-digital conversion module and one-chip computer module in turn; Described one-chip computer module is also connected with display module and range indicating module; Described power module is connected with range indicating module with range handover module, signal amplification module, RMS conversion module, analog-to-digital conversion module, one-chip computer module, display module.

As shown in Figure 2, described power module is made up of bridge rectifier chip D1, the first voltage stabilizing chip VR1 and the second voltage stabilizing chip VR2 cascade; Add in the prime of bridge rectifier chip D1 the prime filtering circuit be made up of the first electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3, the 4th electric capacity C4, the 5th electric capacity C5 and the 6th electric capacity C6 simultaneously, be that the first voltage stabilizing chip VR1 and the second voltage stabilizing chip VR2 provide stable input voltage, and at the rear class filtering circuit that the output terminal of the first voltage stabilizing chip VR1 and the second voltage stabilizing chip VR2 uses the 7th electric capacity C7, the 8th electric capacity C8, the 9th electric capacity C9 and the tenth electric capacity C10 to form, for the utility model provides stable power supply.

As shown in Figure 3, described signal attenuation module is made up of the first resistance R1, the second resistance R2, the 3rd resistance R3, the 4th resistance R4 and the 5th resistance R5 successively cascade, by signal attenuation module, dividing potential drop is carried out to input signal, serve the effect to attenuated input signal.

As shown in Figure 4, described range handover module is by the first relay K 1, second relay K 2, the 3rd relay K 3, the 4th relay K 4 with the 5th relay K 5 is parallel with one another forms; Carry out by the break-make of each relay the electric signal that gating signal attenuation module exports, thus achieve the selection to range needed for input signal.

As shown in Figure 5, described signal amplification module is made up of the first amplifier U1 and the second amplifier U3 cascade; By the first amplifier U1 and the second amplifier U3, the electric signal that range handover module exports is amplified, for late-class circuit provides suitable electric signal.

As shown in Figure 6, described RMS conversion module is made up of RMS conversion chip U5 and peripheral 16 resistance R16 and the 14 electric capacity C14, after the output signal of front stage circuits being converted to direct current signal by RMS conversion module, then be transferred to late-class circuit.

As shown in Figure 7, described analog-to-digital conversion module is made up of A/D chip U2 and peripheral 17 resistance R17, after the simulating signal of prime being converted to digital signal by analog-to-digital conversion module, then is transferred to one-chip computer module.

As shown in Figure 8, described one-chip computer module is made up of singlechip chip U4, and the digital signal that one-chip computer module is then responsible for analog-to-digital conversion module to transmit is changed, and is presented on display module; Simultaneously one-chip computer module selects suitable range for controlling range handover module, and controls range indicating module and show current place range.

As shown in Figure 9, described display module is made up of liquid crystal display J1 and the 18 resistance R18; Display module then shows the data from one-chip computer module.

As shown in Figure 10, described range indicating module is made up of connect one by one the 19 resistance R19, the 20 resistance R20, the 21 resistance R21, the 22 resistance R12 and the 23 resistance R23 of the first light emitting diode D9, the second light emitting diode D10, the 3rd light emitting diode D11, the 4th light emitting diode D12 and the 5th light emitting diode D13; Range indicating module then by the state that each light emitting diode is lit, thus indicates current place range.

A kind of measuring error of the present utility model is little, precision is high, can according to input voltage size automatic switching range, measuring voltage can the accurate numerical monitor ac millivoltmeter of numerical monitor simultaneously; When the utility model is started working, one-chip computer module controls range handover module and is in maximum range, after input signal is decayed by attenuation module, send into range handover module, and then send into one-chip computer module by signal amplification module, RMS conversion module and analog-to-digital conversion module successively; As input signal is too small, one-chip computer module then controls range handover module and successively reduces range, after choosing suitable range, single-chip microcomputer is shown in display module after then being changed by the signal received, and drives range indicating module to indicate current selected range; The utility model greatly reduces measuring error, improves measuring accuracy, simultaneously by automatically selecting range, brings great convenience to circuit designers or user.

Embodiment recited above is only be described preferred implementation of the present utility model, not limits design of the present utility model and scope.Under the prerequisite not departing from the utility model design concept; the various modification that this area ordinary person makes the technical solution of the utility model and improvement; protection domain of the present utility model all should be dropped into; the technology contents of the utility model request protection, all records in detail in the claims.

Claims

1. an accurate numerical monitor ac millivoltmeter, is characterized in that: comprise power module and signal attenuation module; Described signal attenuation module is connected with range handover module, signal amplification module, RMS conversion module, analog-to-digital conversion module and one-chip computer module in turn; Described one-chip computer module is also connected with display module and range indicating module; Described power module is connected with range indicating module with range handover module, signal amplification module, RMS conversion module, analog-to-digital conversion module, one-chip computer module, display module;

Described power module is made up of bridge rectifier chip (D1), the first voltage stabilizing chip (VR1) and the second voltage stabilizing chip (VR2) cascade;

Described signal attenuation module is made up of the first resistance (R1), the second resistance (R2), the 3rd resistance (R3), the 4th resistance (R4) and the 5th resistance (R5) successively cascade;

Described range handover module is by the first relay (K1), the second relay (K2), the 3rd relay (K3), the 4th relay (K4) and the 5th relay (K5) is parallel with one another forms;

Described RMS conversion module is made up of RMS conversion chip (U5) and peripheral 16 resistance (R16) and the 14 electric capacity (C14).

2. accurate numerical monitor ac millivoltmeter according to claim 1, is characterized in that: described signal amplification module is made up of the first amplifier (U1) and the second amplifier (U3) cascade.

3. accurate numerical monitor ac millivoltmeter according to claim 1, is characterized in that: described analog-to-digital conversion module is made up of A/D chip (U2) and peripheral 17 resistance (R17).

4. accurate numerical monitor ac millivoltmeter according to claim 1, is characterized in that: described one-chip computer module is made up of singlechip chip (U4).

5. accurate numerical monitor ac millivoltmeter according to claim 1, is characterized in that: described display module is made up of liquid crystal display (J1) and the 18 resistance (R18).

6. accurate numerical monitor ac millivoltmeter according to claim 1, is characterized in that: described range indicating module is made up of connect one by one the 19 resistance (R19), the 20 resistance (R20), the 21 resistance (R21), the 22 resistance (R12) and the 23 resistance (R23) of the first light emitting diode (D9), the second light emitting diode (D10), the 3rd light emitting diode (D11), the 4th light emitting diode (D12) and the 5th light emitting diode (D13).