JP2014091007A - Meridian measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple device realized with small number of components and less processing at low costs, as opposed to conventional devises in which a peak value is estimated from sampling data obtained through A/D conversion of waveform change at a prescribed period for prescribed time to avoid low accuracy of a peak value of a current as a BP value measured in an analog circuit.SOLUTION: A measuring circuit is composed of a simple analog circuit and before measurement, a reference value is stored for measured values by measuring a reference CR circuit. When a human body is measured, a measured value is converted using the reference value and a BP value is calibrated by an IQ value because the BP value becomes low in response to a low capacitor component at electricity conduction of the human body.

Description

The present invention relates to a meridian measuring apparatus that electrically measures a meridian state in oriental medicine.

Various measuring devices are known that conduct current between a specific site on the human skin and acupoints and perform diagnosis on meridian truth and physical health based on the magnitude and characteristics of the flowing current.

Among these devices, it seems that the device initially announced under the name Motoyama meridian organ function measuring device is highly evaluated as being able to accurately determine the true or false of meridians.

Two points on the human skin can be regarded as an equivalent circuit in which a resistor and a capacitor are electrically connected in series.

In the measuring apparatus, a single DC pulse voltage of 3 V is applied between two points on the skin. At this time, due to the capacitor capacity component in the equivalent circuit, the energization current peaks at the moment of the rise of the pulse, and then gradually decreases and settles at a constant value.

The measurement apparatus performs various determinations by reading the three characteristics of the current change at this time.

The first characteristic of the current to be read is the instantaneous current peak value “BP”, the second is the current value when the current gradually decreases and settles to a constant value, “AP”, and the third A value obtained by integrating the gradually decreasing current value is called “IQ”.

By the way, the current change is a phenomenon that occurs within a minute time of several μs to several tens of μs, and the peak of the current is even shorter, 10 μs or less. For this reason, even if it was attempted to directly measure the peak value with a conventional analog circuit, the error was so great that it was not practical.

Therefore, in the above measuring apparatus, for example, the current value is sampled at a constant cycle of 1 μs and A / D converted, and a large number of sampling data is temporarily stored in the memory. The peak value is estimated from the inclination angle of the current drop at two time points. Further, the digital value obtained by reading the integration of the third current value is integrated and calculated by a program such as a microcomputer.

Japanese Patent No. 4238140 Japanese Patent Publication No. 2-33331 JP-A-8-168469

"Meridians-Measuring organ function", Institute of Religious Psychology, issued July 23, 1974 "Science of Science", the Institute, February 8, 2009

In the conventional apparatus, as described above, a large number of expensive parts for digital signal processing are required for processing such as current value sampling, A / D conversion, and data storage. For this reason, there was a problem that the manufacturing cost was high and the system was expensive.

An object of the present invention is to provide a meridian measuring device that can be manufactured at low cost with a small amount of components.

In order to achieve this object, the present invention measures the reference CR circuit and stores the detection level of the measurement circuit before actual measurement of the human body, and at the time of actual measurement, the actual measurement value is based on the stored data. Conversion correction.

That is, a pulse generation circuit that generates a DC pulse voltage having a constant voltage and a constant pulse width, a BP value reading circuit that reads the peak value of the energizing current, an AP value reading circuit that reads the stable value of the energizing current, and an integral value of the energizing current Basically, the IQ value reading circuit that reads the reference CR circuit having at least one single resistance circuit and two CR series circuits of resistors and capacitors, and the reference CR circuit or two points on the human skin are included. A circuit for selectively energizing one of them is provided, and the current peak value, stable value, and integral value when the reference CR circuit is energized are read and stored before actual measurement.

At the time of actual measurement, the two points on the human skin are energized to read the peak value, the stable value, and the integral value of the energization current, and then the read integral value is stored in the previously stored stable value and integral value. On the basis of the resistance value of the reference CR circuit, only the capacitor capacity component is calculated except for the resistance component, and the integrated value of the capacitance component is used as the IQ value, and the read current peak value is used as the capacitor capacity of the reference CR circuit. Based on the value, the resistance value, and the plurality of current peak value data stored in advance, the level decrease due to the detection characteristic of the electronic circuit is corrected to obtain the BP value.

Based on the BP value, the AP value, and the IQ value obtained as described above, prescribed processing such as display output is executed by the conventional technique.

Before the actual measurement, the reference CR circuit is measured and the reference value is stored. During the actual measurement, the measurement value is converted by the reference value, so that even if the measurement circuit fluctuates due to environmental conditions such as temperature, a certain measurement accuracy is obtained. can get. Further, the detection level of the peak value of the current depends on the capacitor component of the human body serving as a conductor, but by correcting with the IQ value, the BP value becomes more accurate.

As a result, the BP measurement circuit, AP measurement circuit, IQ measurement circuit, etc. need not be improved in accuracy by digital processing as in the prior art, and can be configured with a small number of inexpensive analog circuit components, thereby reducing the cost of the apparatus. Become.

The block diagram of the meridian measuring apparatus which is one Example of this invention. The circuit diagram of a waveform measurement circuit. The block structure figure at the time of the detection characteristic measurement experiment of a BP measurement part. The operation | movement flowchart of a BP measurement part. The graph which shows the change of the voltage detection value of a BP measurement part. The graph which shows the change rate of the detection voltage of a BP measurement part. The operation | movement flowchart of a meridian measuring apparatus. Signal time chart of waveform measurement circuit. FIG. 5 is a list of data stored when measuring a reference CR measurement circuit. The operation | movement flowchart of a conversion process. The content explanatory view of the integral value in an IQ measurement part. Explanatory drawing which shows the correction | amendment calculation method of BP value.

Examples of the present invention will be described below.

FIG. 1 is a block configuration diagram of the meridian measuring apparatus according to the present embodiment.

This meridian measuring device is composed of a measuring unit 1 and a data processing unit 2.

In the measurement unit 1, an indifferent electrode 11 and a related electrode 12 applied to a human body 2 are attached with two cords, and the data processing unit 3 is connected with a signal line 13. The data processing unit 3 is a normal personal computer equipped with a monitor screen and a printer.

The measuring unit 1 includes a reference CR circuit 14, a switching circuit 15, a waveform measuring circuit 16, and a control circuit 17.

The reference CR circuit 14 includes resistors Rap1 and Rbp1 and capacitors Ciq1 and Ciq2, and one end of each is connected to the switching circuit 15. The switching circuit 15 selects one of the five lines and connects it to the input of the waveform measuring circuit 16, and is, for example, a CMOS-IC analog switch. The waveform measurement circuit 16 measures three signal values corresponding to the BP value, the AP value, and the IQ value from the input current waveform. The control circuit 17 is a known microcomputer having an A / D conversion function, and converts the detection value of the waveform measurement circuit 16 into a digital signal and outputs it to the data processing unit 3. The control circuit 17 is provided with a start switch 18 and a measurement switch 19.

FIG. 2 is a circuit diagram of the waveform measurement circuit 16.

The waveform measurement circuit 16 includes a BP measurement unit 161, an AP measurement unit 162, and an IQ measurement unit 163. The BP measurement unit 161 is a circuit that takes an input current as a voltage and detects a peak value of the voltage. This detected value is a measured value that is the basis of the BP value that is finally displayed in a graph or the like in the data processing unit 2. The AP measurement unit 162 detects a voltage value that is a basis of the AP value, and the IQ measurement unit 163 detects a voltage value that is a source of the IQ value.

In the BP measurement unit 161, the operational amplifier Q1, transistor Q2, and resistors R1 to R4 constitute a non-inverting amplifier circuit, the resistor R5, transistor Q3, capacitor C1, and FET Q5 constitute a voltage hold circuit, and the operational amplifier Q4 constitutes a voltage follower circuit. ing. The BP measurement unit 161 includes a peak hold circuit that holds the peak value of the input voltage Vin by these three types of circuits. The resistor R1 is a resistor to which a 3V pulse is applied in series with a human body in terms of measurement, and is set to 100Ω in accordance with a conventional device.

In the AP measurement unit 162, the operational amplifier Q6 and the resistors R6 and R7 constitute one inverting amplifier circuit, and the operational amplifier Q7, the resistors R8 and R9, and the variable resistor R10 constitute another inverting amplifier circuit. The variable resistor R10 adjusts the offset of the inverting amplifier circuit. These inverting amplifier circuits are known circuits.

In the IQ measuring unit 163, an operational amplifier Q8, resistors R11 and R12, and a capacitor C2 constitute a known integrating circuit. The FET Q9 turns on / off the signal input to the integrating circuit. The FET Q10 discharges the charge of the capacitor C2 after the integration operation is completed.

Although not shown, a positive power source + V and a negative power source -V are applied to each operational amplifier Q8 in the waveform measuring circuit 16.

Here, the peak voltage detection operation and the characteristics of the BP measurement unit 161 will be described.

FIG. 3 is a measurement experiment circuit when the applicant of the present application examined the peak voltage detection characteristics.

In this experiment, the pulse voltage output from the pulse generator 4 was applied to the BP measurement unit 161 via the equivalent circuit 5 and the detection voltage Vbp of the BP measurement unit 161 was measured.

The equivalent circuit 5 is an experimental circuit that assumes a state in which electrodes are applied to two points on the human skin, and is composed of resistors Rbp and Rap and a capacitor Ciq. The reason why the resistance Rbp and the capacitor Ciq are indicated as “variable” with an arrow is that the resistance Rbp and the capacitor Ciq are described as “variable” because they are measured many times while replacing various resistance values and various capacitance values.

The operation and circuit operation for each measurement are as follows.

First, as shown in FIG. 4 (a), the gate voltage of the FET Q5 is dropped from 0V to a negative potential by the signal source 6, and the FET Q5 is turned off for a fixed time T1 such as 80 μs. Thereby, the capacitor C1 can be charged.

Next, as shown in FIG. 4B, the pulse generator 4 outputs a pulse voltage of 3 V and a pulse width of about 2 ms once and energizes the BP measurement unit 161 via the equivalent circuit 5. As a result, a pulse wave-like input voltage Vin as shown in FIG. 5C is generated at both ends of the resistor R1 (100Ω) in the BP measuring unit 161.

The amplifier circuit formed by the operational amplifier Q1 amplifies this voltage Vin. At this time, a current proportional to the current flowing through the base of the transistor Q2 also flows through the transistor Q3, and the capacitor C1 is charged. The charged voltage is detected by the off-amp Q4 and is output as the detection voltage Vbp as shown in FIG.

The control circuit 17 A / D converts the detected voltage Vbp and sends it to the data processing unit 2.

Incidentally, the resistance Rbp of the equivalent circuit 5 is about 1 kΩ to 3 kΩ, whereas the resistance Rap is as large as several tens kΩ. Therefore, for the sake of simplicity, if the resistor Rap having a large resistance value is ignored, a current corresponding to the current I = 3 V / (Rbp + R1) Ω flows through the capacitor Ciq at the moment when the pulse voltage is applied. That is, the capacitor Ciq is short-circuited. A voltage proportional to this current becomes the input voltage Vin. Since the amplification circuit formed by the operational amplifier Q1 has a constant amplification factor, it is ideal that the voltage Vin is amplified and a detection voltage Vbp proportional to the voltage Vin is obtained, but this is not the case.

The amplification circuit has a constant amplification degree for a low-frequency signal whose change is slow, but the amplification part decreases because the peak portion p of the voltage Vin shown in FIG. 4C includes a high-frequency component. . When the amplification level decreases, the ratio of the detection voltage Vbp to the input voltage Vin also decreases.

In order to investigate the tendency of this voltage drop, two resistance Rbp with large and small resistance values and several capacitors C with various capacities were prepared, and a measurement experiment of the detection voltage Vbp was performed.

FIG. 5 shows the experimental results. The detection voltage Vbp is low when the resistance Rbp is large, and it is natural that the voltage is high when the resistance Rbp is small, but when looking at one resistance Rbp, the detection voltage Vbp increases according to the capacity of the capacitor Ciq. Become.

FIG. 6 is a graph in which the same experimental data as FIG. 5 is arranged.

In this figure, there are two types of resistance Rbp, both of which have a voltage value corresponding to current I = 3V / (resistance Rbp + R1) Ω, that is, a voltage value corresponding to when capacitor C is short-circuited, as 100%. . The horizontal axis of the graph is the reciprocal 1 / C of the capacity of the capacitor C.

Then, it can be seen that the detection voltage Vbp decreases in inverse proportion to the capacitance of C when the capacitance of the capacitor C is a certain value or less.

By the way, the applicant estimates that the capacitance of the capacitor C is usually 1000 pF or more and the resistance Rbp is about 1 to 3 kΩ in an actual human body measurement experiment. For example, the difference in reduction rate between the case where the capacitor C is 1000 pF and the resistance Rbp is 1 kΩ and 3 kΩ is about 2%. In subsequent measurement examples, since the capacitor C is 1000 pF or more, the decrease rate difference is even smaller.

Next, the operation of the entire meridian measuring apparatus will be described.

FIG. 7 is an operation flowchart of the present apparatus.

The operator first presses the start switch 17 to start the apparatus (process 71).

When this apparatus is activated, the measurement process of the reference CR circuit 14 is first executed as follows.

The switching circuit 15 first selects the resistor Rbp1. The resistor Rbp1 corresponds to the resistor Rbp of the equivalent circuit 5, and serves as a reference for BP measurement.

Since the actual human body differs depending on various conditions such as individual differences, climate, and meridians, in this embodiment, the resistance value is set to a statistical average value under various conditions.

Then, as shown in FIG. 8A, the control circuit 17 outputs a pulse voltage of 3 V and a pulse width of 2 ms. As a result, a current flows into the waveform measurement circuit 16 through the resistor Rbp1.

The BP measurement unit 161 executes the peak hold operation and outputs the detection voltage Vbp. The detected voltage Vbp is A / D converted in the control circuit 17 and sent to the data processing unit 2.

In the reference CR circuit 14, a flat pulse current flows without passing through the capacitor. A flat voltage value proportional to the pulse current is output as the detection voltage Vbp.

The data processing unit 2 temporarily stores various data received in the measurement process of the reference CR circuit 14 currently being executed.

FIG. 9 shows a list of stored data. In the measurement of the resistance Rbp1, as shown in FIGS. 9A and 9B, the calculated current value Ibp0 and the voltage Vbp are A / D converted. The measured value Dbp0 is stored. The current value Ibp0 is a calculated current value of Ibp0 = (3 / Rbp + R1), and since the resistance values Rbp1 and R1 are fixed values, the current value Ibp0 is also a fixed value. The measured value Dbp0 changes at every measurement due to the environmental temperature or the like.

Next, the switching circuit 15 selects the capacitor Ciq1 and outputs a pulse voltage from the control circuit 17. Capacitors Ciq1 and Ciq2 correspond to the capacitor Ciq in FIG. 3, and are set to two types of constant values, large and small. As a result, the detection voltage Vbp for the series circuit of the resistor Rbp1 + capacitor Ciq1 is output from the BP measuring unit 161.

In this case, since the capacitor Ciq1 is included in the circuit, the pulse wave voltage Vi as shown in FIG. 8 (b) is input to the BP measuring unit 161 and amplified, and the BP measuring unit 161 receives FIG. As shown in c), the detection voltage Vbp corresponding to the peak value of the waveform is output.

At this time, an amplified voltage Vm proportional to the input Vin as shown in FIG. 9D is generated at the emitter of the transistor Q2 in the BP measuring unit 161.

Now, the voltage Vm is amplified by being inverted in polarity once by the operational amplifier Q6 in the AP measurement unit 162 and input to the IQ reading unit 163.

At this time, as shown in FIG. 5E, the FET Q8 is controlled to be on for a certain time T2, and as shown in FIG. 5F, the FET Q10 is controlled from on to off.

The IQ reading unit 163 constitutes a known analog integration circuit, and the input voltage at this time is integrated, and as shown in FIG. 8 (g), the detection voltage Viq gradually increases, and after a certain time T2 has elapsed. It becomes a constant value. This detection voltage Viq is A / D converted and sent to the data processing unit 3.

At this time, as shown in FIGS. 9C and 9D, the data processing unit 3 stores measured values Dbp1 and Diq1 obtained by A / D converting the voltage Vbp and the voltage Viq, respectively. Further, as shown in Table (e), the capacitance value of the capacitor Ciq1 is also stored.

Next, the switching circuit 15 selects the capacitor Ciq2, and each part operates in the same manner as described above. The data processing unit 3 stores the measured values Dbp2 and Diq2 as shown in the tables (f) to (h), and also stores the capacitance value of the capacitor Ciq2.

Next, the switching circuit 15 selects the resistor Rap1, and at this time, the AP measurement unit 162 amplifies the detection voltage Vm in the BP measurement unit 161 and outputs it as the detection voltage Vap. This voltage Vap is A / D changed and sent to the data processing unit 2.

The data processing unit 2 stores a calculated current value Iap0 as shown in FIG. 9 (i). At this time, the measurement values Dap0 and Diq0, which are A / D conversion values of the voltage Vap and the voltage Viq, are stored (the processing 72 in FIG. 7).

The process 72 is automatically executed by a microcomputer program and is a process of 1 second or less.

Next, the operator attaches the indifferent electrode 11 to a predetermined part of the human body that is the subject, first applies the electrode 12 related to the first well to be measured, and presses the measurement switch 19 (process 73). .

In the measuring unit 1, the switching circuit 15 selects the line of the related electrode 12 here. Then, each unit executes the series of measurement processes. In the above description of the operation, the case where the AP measurement unit 162 of the measurement circuit 16 amplifies the pulse wave voltage Vm as shown in FIG. The control circuit 17 reads after a certain time such as 1 ms when the voltage Vm gradually decreases and stabilizes.

By this series of operations, the three types of detection voltages Vbp, Vap, and Viq are A / D converted and sent to the data processing unit 2 as measured values Dbp, Dap, and Diq, respectively (processing 74).

Next, the data processing unit 2 converts the received measurement values Dbp, Dap, and Diq into target BP values, AP values, and IQ values, respectively (processing 75).

FIG. 10 shows this conversion process.

First, the data processing unit 2 assumes that the AP value is Dap and the current measured value is Dap. From the stored current value Iap0 and the measured value Dap0 described in FIG. 9 (i) and (j), AP value = Dap × (Iap0 / Dap0).

The analog values corresponding to the measured values Dbp, Dap, and Diq are executed by the A / D conversion circuit built in the microcomputer of the control circuit 17. For example, an analog voltage of 0 to +5 V is converted into a 10-bit binary value. If it is 10 bits, it is converted to a range of 0 to 1023 in decimal.

Now, for example, assume that the current value Iap0 calculated above is Iap0 = 10 μA and the measured value Dap0 is Dap0 = 100 when measuring the reference CR circuit 14 described with reference to FIG. Then, if the measured value Dap is Dap = 200 at the time of actual measurement of the human body this time, it can be seen from the above formula that the AP value X is twice that of the measurement of the reference CR circuit 14 (process 101).

Next, the data processing unit 2 executes a series of operations for calculating a capacitance component corresponding to the capacitor Ciq of the human body 3.

The voltage value of the detection voltage Viq of the IQ measurement unit 163 is an integral value obtained by integrating the fluctuation of the voltage Vm in the BP measurement circuit 161 for T2 time. As shown in FIG. 11, this can be divided into the equivalent circuit 5 using the capacitor Ciq and the resistor Rap.

Here, the data processing unit 2 calculates the resistance Rap component in the measured value Diq, which is the A / D value of the integrated value Viq of the voltage Vm.

If the resistance Rap component of the measured value Diq to be obtained is IQr, IQr = Dap × (Diq0 / Dap0) is calculated from the storage current value Iap0 and the measured value Diq0 in FIGS. ).

Next, the capacitor Ciq component IQc of the measured value Diq is calculated as IQc = Diq-IQr (processing 103).

Then, the capacitance Cx of the capacitor Ciq is calculated as Cx = IQc × Ciq1 / Diq1 (process 104).

In this embodiment, the data processing unit 2 sets the capacitor Ciq component IQc value as a target IQ value. Therefore, the IQ value is in the same unit as a capacitor such as pF. (Process 105).

Next, the data processing unit 2 calculates the decrease rate of the detection voltage Vbp of the BP measurement unit 161 as follows.

FIG. 12 is a graph in which the decrease rate of the detected voltage Vbp at the time of actual measurement is expressed by the notation method of FIG.

This figure shows the calculated current value Ibp0 and the measured value Dbp0 of the resistor Rbp1 shown in FIGS. 9A and 9B as 100% and is shown in FIGS. 9C, 9D, 9F, and 10G. The measured values Dbp1, Ciq1, Dbp2, Ciq2 are used. That is, when the capacitor Ciq1, the decrease rate L1 = Dbp1 / Dbp1, and when the capacitor Ciq2, the decrease rate L2 = Dbp2 / Dbp.

From this figure, it can be seen that the reduction rate Lx for a capacitor having an arbitrary capacitance value Cx can be calculated from the following equation.

The data processing unit 2 calculates the decrease rate Lx of the detection voltage Vbp by the above equation (processing 106).

Next, the target BP value is calculated as BP value = Dbp / Lx based on the current measured value Dbp and the decrease rate Lx. As a result, the measured value Dbp, which has decreased due to the detection characteristics of the BP measuring circuit 161, is corrected to 100% (processing 107).

The data processing unit 2 stores the BP value, AP value, and IQ value for one well read as described above.

In this way, the measurement of one well is completed. If there is a well to be measured next (FIG. 7, Y in process 76), the operator repeats the measurement operation (to process 73).

Normally, 28 wells and wells are measured, but when all are completed (N in process 76), the data processing unit 2 performs display printing processing of the BP value, the AP value, and the IQ value by a known technique.

As described above, in this embodiment, before the actual measurement of the human body, the reference CR circuit 14 is measured to store the reference measurement value, and at the time of actual measurement, the measurement value is converted to the reference value, so that waveform measurement is performed. Even if the characteristics of the circuit 16 and the A / D conversion circuit in the control circuit 17 change due to environmental conditions such as temperature, a certain measurement accuracy can be obtained.

In addition, the detection voltage Vbp of the BP measurement unit 161 has a detection characteristic that it decreases as the capacitor component on the energization circuit decreases, but by correcting with an IQ value equal to the capacitor component, the BP value also becomes more accurate.

As a result, the main measurement circuit can be configured with a small number of inexpensive analog circuit components, such as the waveform measurement circuit 16, eliminating the need for complex digital circuits as in the past, and reducing the overall cost of the device. become.

In the above embodiment, the offset correction of the operational amplifier has not been described. In the meridian measuring apparatus of the embodiment, the operational amplifier Q7 having a high amplification degree in the waveform measuring circuit 16 is easily influenced by the offset of the operational amplifier. When the offset correction process is performed, the variable resistor R10 is adjusted so that the output of the operational amplifier Q7 always outputs a positive voltage regardless of the environment even when the input is 0V. Then, in the process 72 of FIG. 7, the offset voltage at that time is measured and stored. In the process 74, the stored offset voltage may be subtracted from the voltage Vap. This is a known technique.

Further, although the reference CR circuit 14 is composed of four circuits of the four parts of the resistors Rbp and Rap and the capacitors Ciq1 and Ciq2, one resistor can be used for both AP and BP. Furthermore, it is better to increase the number of capacitors and measure the rate of decrease in the BP voltage over a wider capacitor capacity range.

Although the name of the present invention is a meridian measuring device, it can be applied not only to measurement of wells and other acupuncture points, but also to measurement of characteristics of cell stroma of the human body.

1: Measuring unit 11: Indifferent electrode 12: Related electrode 13: Signal line 14: Reference CR circuit 15: Switching circuit 16: Waveform measuring circuit 161: BP measuring unit 162: AP measuring unit 163: IQ measuring unit 17: Control circuit 18: Start switch 19: Measurement switch 2: Data processing unit 3: Human body

Claims (1)

A reference CR circuit comprising at least one single resistor circuit and two CR series circuits of resistors and capacitors;
A pulse generating circuit for generating a DC pulse voltage having a constant voltage and a constant pulse width;
A switching energization circuit that selects one of the reference CR circuit or two points on the human skin and energizes the pulse generation circuit;
A BP value reading circuit for reading the peak value of the energization current by the switching energization circuit;
A pre-measurement AP value reading circuit for reading the stable value of the energization current;
A pre-measurement IQ value reading circuit for reading the integrated value of the electric current;
Pre-measurement measuring means for energizing the reference CR circuit to read and store the current peak value, stable value, and integral value;
Current measurement means for energizing two points on the human skin and reading the current peak value, stable value, and integral value;
AP value conversion means for converting the stable value read by the measurement means at the time of actual measurement into an AP value based on the stable value stored in the measurement means before actual measurement and the resistance value of the reference CR circuit;
Capacitance calculating means for calculating only the capacitor capacity component excluding the resistance component based on the stable value, the integrated value, and the resistance value of the reference CR circuit stored in the pre-measurement measuring means as the integrated value read by the measuring means at the time of actual measurement. When,
IQ calculating means that uses the capacitor capacity component as an IQ value;
The electronic circuit detects the current peak value read by the measurement means at the time of actual measurement based on the capacitor capacity value and resistance value of the reference CR circuit and a plurality of current peak value data stored in the measurement means before measurement. BP value correction calculating means for correcting the level drop due to the characteristic to obtain a BP value;
A meridian measuring apparatus comprising processing means for performing prescribed processing based on the corrected BP value, the AP value of the AP value conversion means, and the IQ value of the IQ calculation means.