CN208598395U - A kind of bio-impedance analog meter - Google Patents
A kind of bio-impedance analog meter Download PDFInfo
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- CN208598395U CN208598395U CN201721245460.6U CN201721245460U CN208598395U CN 208598395 U CN208598395 U CN 208598395U CN 201721245460 U CN201721245460 U CN 201721245460U CN 208598395 U CN208598395 U CN 208598395U
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- 238000005259 measurement Methods 0.000 claims abstract description 60
- 238000004088 simulation Methods 0.000 claims abstract description 10
- 238000012360 testing method Methods 0.000 claims description 72
- 238000012545 processing Methods 0.000 claims description 33
- 239000003990 capacitor Substances 0.000 claims description 17
- 238000002847 impedance measurement Methods 0.000 claims description 5
- 239000004065 semiconductor Substances 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 13
- 210000000577 adipose tissue Anatomy 0.000 description 12
- 238000010586 diagram Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 230000008859 change Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000011871 bio-impedance analysis Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Abstract
The utility model discloses a kind of bio-impedance analog meters, including at least a pair of of measurement terminal；Each pair of measurement terminal includes first measurement terminal and second measurement terminal；For the contact impedance simulator of simulating contact impedance, including positive sub-device and cathode sub-device；The first end of positive sub-device is separately connected each first measurement terminal；The first end of cathode sub-device is separately connected each second measurement terminal；Positive sub-device and cathode sub-device respectively include several variable resistances, and each variable resistance is arranged in a one-to-one correspondence with each measurement terminal respectively；For simulating the bio-impedance simulator of bio-impedance, the both ends of bio-impedance simulator are separately connected the second end and cathode sub-device second end of positive sub-device.The utility model provides a kind of analog meter of sufficiently simulation bio-impedance model, is a kind of more accurate detection calibration tool in view of the contact impedance in true environment.
Description
Technical field
The utility model relates to bioimpedance analysis fields, more particularly to a kind of bio-impedance analog meter.
Background technique
Bio-impedance is the pith of biology character, and especially bioimpedance analysis has become the weight that health field is paid close attention to
Point.The common method of impedance analysis has four-wire system and two-wire system at present, and the body fat based on both methods claims, body fat wrist-watch etc. produces
Product also occur in succession.In order to guarantee body fat claim, the quasi- accuracy of measurement of the products such as body fat wrist-watch, need using impedance simulation equipment
Bio-impedance is simulated, is claimed later by body fat, the bio-impedance of the Devices to test measurement impedance simulation equipment such as body fat wrist-watch, later
Its measured value is compared with realistic simulation value, to determine whether Devices to test is accurate.
But since existing impedance simulation equipment does not consider really to measure contact impedance and its variation under environment, with
And fail sufficiently to simulate human body impedance model, the accuracy of the said goods is always by query.
Therefore, how to provide that a kind of accuracy is higher, for the bio-impedance analog meter of above-mentioned detection calibration equipment is
The current problem to be solved of those skilled in the art.
Utility model content
The purpose of the utility model is to provide a kind of bio-impedance analog meter, true measurement environment can be more accurately simulated
Lower contact impedance and human body impedance model.
To solve the above-mentioned problems, a kind of bio-impedance analog meter provided by the utility model, comprising:
At least a pair of of measurement terminal；Each pair of measurement terminal includes first measurement terminal and second measurement end
Son；
For the contact impedance simulator of simulating contact impedance, including positive sub-device and cathode sub-device；It is described just
The first end of pole sub-device is separately connected each first measurement terminal；The first end of the cathode sub-device is separately connected respectively
A second measurement terminal；The anode sub-device and the cathode sub-device respectively include several variable resistances, respectively
A variable resistance is arranged in a one-to-one correspondence with each measurement terminal respectively；
For simulating the bio-impedance simulator of bio-impedance, the both ends of the bio-impedance simulator are separately connected
The second end and the cathode sub-device second end of the anode sub-device.
Preferably, the bio-impedance simulator includes RC network.
Preferably, the variable resistance is program-controlled resistor.
Preferably, the contact impedance simulator further includes several filter capacitors, each filter capacitor difference
It connects with each program-controlled resistor one-to-one correspondence.
Preferably, the contact impedance simulator further includes in parallel with each filter capacitor one-to-one correspondence respectively
Several switches, the switch is for controlling whether corresponding filter capacitor accesses circuit.
Preferably, each switch is any one in triode, metal-oxide-semiconductor and single-pole double-throw switch (SPDT).
Preferably, further comprise:
For for user's input test parameter, and receive the data input device of the test parameter；
It is connected respectively with the contact impedance simulator, the bio-impedance simulator, the data input device
Data processing equipment, for obtaining the test parameter from the data input device and adjusting institute according to the test parameter
State the contact impedance of contact impedance simulator and the bio-impedance of the described and described bio-impedance simulator.
Preferably, further comprise:
The impedance measurement that in parallel and output end is connected with the data processing equipment with the bio-impedance simulator fills
It sets, for measuring the bio-impedance of the bio-impedance simulator and sending the measurements to the data processing equipment,
So that the data processing equipment calibrates the bio-impedance of the bio-impedance simulator according to the measurement result and incites somebody to action
The measurement result is compareed as standard value with the value of measuring of the Devices to test.
Preferably, further comprise:
With the bio-impedance simulator series connection and output end be connected with the data processing equipment current measurement dress
It sets, for measuring the electric current in the bio-impedance simulator and sending the measurements to the data processing equipment, with
Toilet state data processing equipment judge the electric current to organism whether safety, and show judging result.
Preferably, further comprise:
Output display device being connected with data processing equipment, for showing the test result.
The utility model provides a kind of bio-impedance analog meter, including measurement terminal, the contact impedance mould being together in series
Quasi- device, bio-impedance simulator.Bio-impedance analog meter provided by the utility model is in view of in true measurement environment
The variation of contact impedance and contact impedance, with contact impedance simulator simulating contact impedance, with bio-impedance simulator
Bio-impedance is simulated, contact impedance and bio-impedance under true environment are more accurately simulated.Therefore use the life of the utility model
Object impedance simulation instrument tests the available more accurate test result of Devices to test.
Detailed description of the invention
It, below will be to the prior art and embodiment in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only the utility model
Some embodiments for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other attached drawings.
Fig. 1 is the structural schematic diagram of human body impedance analog meter provided by the utility model；
Fig. 2 is a kind of structural schematic diagram of the specific embodiment of analog meter provided by the utility model；
Fig. 3 is the circuit diagram of analog meter in a kind of specific embodiment provided by the utility model.
Specific embodiment
The core of the utility model, which is to provide one kind, can more accurately simulate contact impedance and people under true measurement environment
The bio-impedance analog meter of body impedance model, to use the detection calibration equipment of bio-impedance analog meter of the utility model to mention
For more accurate test result.
It is practical new below in conjunction with this to keep the objectives, technical solutions, and advantages of the embodiments of the present invention clearer
Attached drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that is retouched
The embodiment stated is the utility model a part of the embodiment, instead of all the embodiments.Based on the implementation in the utility model
Example, every other embodiment obtained by those of ordinary skill in the art without making creative efforts belong to
The range of the utility model protection.
Referring to Figure 1, Fig. 1 is the structural schematic diagram of bio-impedance analog meter provided by the utility model.The utility model
The bio-impedance analog meter of offer includes:
At least a pair of of measurement terminal 1, each pair of measurement terminal 1 include first measurement terminal and one second measurement
Terminal；First measurement terminal and the second measurement terminal are respectively used to the positive and negative anodes of connection Devices to test；
For the contact impedance simulator 2 of simulating contact impedance, including positive sub-device and cathode sub-device；It is described just
The first end of pole sub-device is separately connected each first measurement terminal；The first end of the cathode sub-device is separately connected respectively
A second measurement terminal；Positive sub-device and cathode sub-device respectively include several variable resistances, it is each can power transformation
Resistance is arranged in a one-to-one correspondence with each measurement terminal respectively；
For simulating the bio-impedance simulator 3 of bio-impedance, the both ends of the bio-impedance simulator 3 connect respectively
Connect the second end and the cathode sub-device second end of the positive sub-device.
Wherein, above-mentioned Devices to test refers to bodily fat measurement equipment to be detected, such as the production such as body fat claims, body fat wrist-watch
Product.Bio-impedance analog meter is for simulating human body impedance, and Devices to test passes through measurement terminal 1 and bio-impedance analog meter phase later
Even, its measured value, is compared by the impedance value for measuring bio-impedance analog meter with the analogue value of bio-impedance analog meter later,
To determine whether Devices to test is accurate.
In an advantageous embodiment, the bio-impedance analog meter further include:
Data input device 4 is used for for user's input test parameter, and acceptance test data；
The data processing being connected respectively with contact impedance simulator 2, bio-impedance simulator 3, data input device 4
Device 5, for obtaining test parameter from data input device 4 and controlling connecing for contact impedance simulator 2 according to test parameter
It touches impedance and controls the bio-impedance of bio-impedance simulator 3.
It is further known that during detecting Devices to test, by the measured value of Devices to test and bio-impedance analog meter
The process that is compared of the analogue value Devices to test can also be connect with data processing equipment 5 by artificially carrying out, it is to be measured
The measured value of itself is sent to data processing equipment 5 by equipment, the bio-impedance for being measured Devices to test by data processing equipment 5
It is compared with the bio-impedance of bio-impedance analog meter simulation, obtains the test result of Devices to test.Which kind of side specifically used
Formula the utility model is not especially limited.
It should be noted that above-mentioned test result can pass through the bio-impedance that measures Devices to test and bio-impedance mould
The bio-impedance of quasi- instrument does ratio or does difference, as long as both available error, so that data processing equipment 5 is according to above-mentioned
Error obtains the test result of Devices to test, specifically how to obtain error, has no effect on the realization of the utility model.Test
As a result it can be set as qualified, unqualified or Grade A, goods of inferior quality etc. according to the needs of users.The setting of specific test result is simultaneously
The realization of the utility model is not influenced.
Since the Devices to test such as existing body fat bracelet, body fat wrist-watch, Human fat balance are generally based on two-wire system method or four
Line method design, what terminal to be measured generally also occurred in pairs, thus measurement terminal provided by the utility model 1 be also at
To appearance.
The detection calibration for waiting relevant devices is claimed to set carrying out body fat using bio-impedance analog meter provided by the utility model
For when being tested, measurement terminal 1 is connected with Devices to test, the input test parameter in data input device 4, such as test letter
Number frequency, target organism impedance value, target contact impedance value etc., data processing equipment 5 adjust bio-impedance according to above-mentioned parameter
The impedance value of simulator 3 and contact impedance simulator 2, bio-impedance analog meter is with above-mentioned bio-impedance simulator 3
Standard of the bio-impedance as test Devices to test.
In a kind of specific embodiment of the utility model, incorporated by reference to Fig. 2, above-mentioned bio-impedance analog meter is further wrapped
It includes:
The impedance measurement device 6 that in parallel and output end is connected with data processing equipment 5 with bio-impedance simulator 3,
For measuring the bio-impedance of bio-impedance simulator 3 and sending the measurements to data processing equipment 5, at data
Manage the bio-impedance that device 5 adjusts bio-impedance simulator 3 according to measurement result and test parameter.
In the above-described embodiment, the concrete type of impedance measuring equipment can be LCR table as shown in Figure 3, can also be with
It is other impedance measurement devices, specific type of device has no effect on the realization of the utility model.
It is understood that in the present embodiment, bio-impedance measuring values can be measured by impedance measuring equipment, it is known that
Error between the bio-impedance and target organism impedance value of bio-impedance analog machine, and the life to bio-impedance analog machine
Object impedance is further adjusted, and target organism impedance value is closer to, and then keeps test result more accurate.
In the utility model one kind in the specific implementation, bio-impedance simulator 3 can use RC net as shown in Figure 3
Network, data processing equipment 5 control the resistance value and capacitance of RC network according to the measurement result and test parameter of impedance measurement device 6,
Such as when the test result of bio-impedance simulator 3 is less than ideal value, the resistance value and capacitance for controlling RC network increase.At this
In kind implementation method, data processing equipment 5 makes total resistance of bio-impedance simulator by the resistance value and capacitance of adjusting RC network
Resist for the target organism impedance value in test parameter.Certainly, in others in the specific implementation, bio-impedance simulator 3 can also
With using other circuits, specific circuit design has no effect on the realization of the utility model.
In addition, the resistance in the RC network is program-controlled resistor, capacitor is program-controlled capacitor.
The circuit of the primary structure in a kind of specific embodiment provided by the utility model is shown incorporated by reference to Fig. 3, Fig. 3
Figure, in this embodiment, the upper positive sub-device and the cathode sub-device respectively include several program-controlled resistors
21, each program-controlled resistor 21 is arranged in a one-to-one correspondence with each measurement terminal 1 respectively.Measurement terminal 1, the resistance of program-controlled resistor 21
It is worth changing pattern to be controlled by data processing module 5.At this point, in test parameter about the parameter of target contact impedance specifically include
The resistance value and change in resistance mode of program-controlled resistor 21.
Change in resistance mode includes following several:
Program-controlled resistor 21 keeps some constant resistance value；
The resistance value of program-controlled resistor 21 is gradually increased or is reduced with certain speedup in a certain range；
Incrementss or reduction amount of the resistance value of program-controlled resistor 21 within a specific period are more than a specific model
Enclose (i.e. abruptly increase or the situation that die-offs)；
In addition, the resistance value of each program-controlled resistor 21 based on above-mentioned changing pattern can be the same or different.
It is understood that change in resistance mode influences be contact impedance simulator simulation contact impedance value, root
According to actual needs, a kind of changing pattern of any of the above can choose to adjust the value of contact impedance, due to different bio-impedances
Under conditions of contact impedance also can be corresponding different, therefore in order to simulate the bio-impedance in a variety of situations as far as possible
It is tested for Devices to test, it is also desirable to which contact impedance can simulate more impedance value.Certainly, it in addition to the above changing pattern, uses
Family can also independently define the changing pattern of 21 resistance value of program-controlled resistor.
This in the specific implementation, the detection calibration equipment using the bio-impedance analog meter can be to based on two-wire system side
The equipment of method is tested.In circuit diagram shown in Fig. 3, when testing two-wire system equipment, from calibrating terminal 1a, survey
Try an optional terminal in terminal 1b, an optional terminal from calibrating terminal 1c, calibrating terminal 1d, two test leads selected
Son constitutes a pair of of calibrating terminal, is connected respectively with two terminals of two-wire system equipment to be measured, follow-up test process and above-mentioned implementation
The test process of example is identical, and details are not described herein.
Based on above-mentioned analog meter, in conjunction with Fig. 3, contact impedance simulator 2 further includes several filter capacitors 22, Ge Gesuo
Filter capacitor 22 is stated to connect with each one-to-one correspondence of program-controlled resistor 21 respectively.
Above-mentioned filter capacitor 22 is used to filter the flip-flop in test electric current, and this bio-impedance analog meter can be used to
Test the equipment based on four-wire system method.At this point, four calibrating terminals are connected respectively on the corresponding terminal of Devices to test i.e.
It can.
In another preferred embodiment based on above-mentioned analog meter, contact impedance simulator 2 further includes respectively and often
A filter capacitor 22 corresponds switch 23 in parallel.The switch 23 is for controlling whether corresponding filter capacitor 22 accesses
Circuit.
Specific circuit diagram shown in Figure 3.
It is understood that filter capacitor 22 is short-circuited, can be set to based on two-wire system method if switch 23 is closed
It is standby to be tested；If switch 23 is opened, filter capacitor 22 can filter out the flip-flop tested in electric current, at this time can be to being based on
The equipment of four-wire system method is tested.Therefore analog meter in the present embodiment, the state of switching switch 23, test can be passed through
The equipment of above two type.
In above-mentioned analog meter in the specific implementation, each switch 23 is in triode, metal-oxide-semiconductor and single-pole double-throw switch (SPDT)
Any one.It is of course also possible to be other kinds of switch, the type specifically switched has no effect on the utility model embodiment
Realization.Also, the different switches 23 in the bio-impedance analog meter of the utility model can choose different types.
The utility model another kind in the specific implementation, measurement terminal 1 further comprises conducting resinl.
It, can be with it is understood that if Devices to test installs conducting resinl additional in measurement terminal 1 using special-shaped measurement terminal
Section is come into full contact with, the test of device under test is facilitated.
In a kind of specific embodiment of the utility model, structural schematic diagram shown in Figure 2, above-mentioned biology resistance
Anti- analog meter can also include:
With the series connection of bio-impedance simulator 3 and the current measuring device 7 that is connected with data processing equipment 5 of output end,
For measuring the electric current in bio-impedance simulator 3 and sending the measurements to data processing equipment 5, so as to data processing
Whether device 5 judges electric current safe to organism, and shows judging result.
Incorporated by reference to Fig. 3, above-mentioned current measuring device 7 is ammeter A.Certainly, the type of current measuring device 7 has no effect on
The realization of the utility model can also use other kinds of current measuring device 7.
It is easily understood that the electric current that organism is able to bear is limited, if body fat claims equal products, electric current is excessive when in use,
It can be to using the people of the product to damage.Relevant safety regulations (IEC-60601 standard) are to the safe model of the electric current for flowing through human body
It encloses and provides, after current value is uploaded to data processing module by current measuring device 7, by data processing equipment 5 according to phase
The algorithm answered determines whether present current value is safe, and carries out respective handling according to judging result, such as carries out output display or report
It is alert etc..By above-mentioned current measuring device 7, the safety guarantee of product can be improved.
In one embodiment, incorporated by reference to structural schematic diagram shown in Fig. 2, the bio-impedance analog meter of the utility model
Further comprise:
Output display device 8, for showing test result, test result here includes test parameter current value, judgement
And test parameter as a result.
It is understood that can intuitively show the parameters of analog meter by above-mentioned output display device 8, survey
In examination by for the user of the electric current of bio-impedance simulator 3 and the electric current device under test whether safety and
The test result etc. of Devices to test.So that the interactivity of the analog meter is improved.
The utility model provides a kind of bio-impedance analog meter, including measurement terminal, the contact impedance mould being together in series
Quasi- device, bio-impedance simulator.Bio-impedance analog meter provided by the utility model is in view of in true measurement environment
The variation of contact impedance and contact impedance, with contact impedance simulator simulating contact impedance, with bio-impedance simulator
Bio-impedance is simulated, contact impedance and bio-impedance under true environment are more accurately simulated.Therefore use the life of the utility model
Object impedance simulation instrument tests the available more accurate test result of Devices to test.
Above several specific embodiments are only preferred embodiments of the present invention, above several specific embodiments
Can in any combination, the embodiment obtained after combination is also within the protection scope of the utility model.It should be pointed out that for this skill
For the those of ordinary skill in art field, without departing from the principle of this utility model, several improvement can also be made, this
A little improve also should be regarded as the protection scope of the utility model.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.
It should also be noted that, in the present specification, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.
The foregoing description of the disclosed embodiments can be realized professional and technical personnel in the field or using originally practical new
Type.Various modifications to these embodiments will be readily apparent to those skilled in the art, and determine herein
The General Principle of justice can be realized in other embodiments without departing from the spirit or scope of the present utility model.Cause
This, the present invention will not be limited to the embodiments shown herein, and is to fit to and principles disclosed herein
The widest scope consistent with features of novelty.
Claims (10)
1. a kind of bio-impedance analog meter characterized by comprising
At least a pair of of measurement terminal；Each pair of measurement terminal includes first measurement terminal and second measurement terminal；
For the contact impedance simulator of simulating contact impedance, including positive sub-device and cathode sub-device；Anode
The first end of device is separately connected each first measurement terminal；The first end of the cathode sub-device is separately connected each institute
State the second measurement terminal；The anode sub-device and the cathode sub-device respectively include several variable resistances, Ge Gesuo
Variable resistance is stated to be arranged in a one-to-one correspondence with each measurement terminal respectively；
For simulating the bio-impedance simulator of bio-impedance, the both ends of the bio-impedance simulator are separately connected described
The second end of positive sub-device and the cathode sub-device second end.
2. analog meter according to claim 1, which is characterized in that the bio-impedance simulator includes RC network.
3. analog meter according to claim 1, which is characterized in that the variable resistance is program-controlled resistor.
4. analog meter according to claim 3, which is characterized in that the contact impedance simulator further includes several filters
Wave capacitor, each filter capacitor are connected with each program-controlled resistor one-to-one correspondence respectively.
5. analog meter according to claim 4, which is characterized in that the contact impedance simulator further includes respectively and often
A filter capacitor corresponds several switches in parallel, and whether the switch is for controlling corresponding filter capacitor
Access circuit.
6. analog meter according to claim 5, which is characterized in that each switch is triode, metal-oxide-semiconductor and hilted broadsword
Any one in commutator.
7. analog meter according to claim 1-6, which is characterized in that further comprise:
For for user's input test parameter, and receive the data input device of the test parameter；
The number being connected respectively with the contact impedance simulator, the bio-impedance simulator, the data input device
According to processing unit, for obtaining the test parameter from the data input device and being connect according to test parameter adjusting
Touch the contact impedance of impedance simulation device and the bio-impedance of the bio-impedance simulator.
8. analog meter according to claim 7, which is characterized in that further comprise:
The impedance measurement device that in parallel and output end is connected with the data processing equipment with the bio-impedance simulator,
For measuring the bio-impedance of the bio-impedance simulator and sending the measurements to the data processing equipment, so as to
The data processing equipment according to the measurement result calibrate the bio-impedance simulator bio-impedance and will be described
Measurement result is compareed as standard value with the value of measuring of Devices to test.
9. analog meter according to claim 7, which is characterized in that further comprise:
With bio-impedance simulator series connection and the current measuring device that is connected with the data processing equipment of output end,
For measuring the electric current in the bio-impedance simulator and sending the measurements to the data processing equipment, with toilet
State data processing equipment judge the electric current to organism whether safety, and show judging result.
10. analog meter according to claim 7, which is characterized in that further comprise:
The output display device of test result be connected with data processing equipment, for showing the data processing equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721245460.6U CN208598395U (en) | 2017-09-26 | 2017-09-26 | A kind of bio-impedance analog meter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721245460.6U CN208598395U (en) | 2017-09-26 | 2017-09-26 | A kind of bio-impedance analog meter |
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| Publication Number | Publication Date |
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| CN208598395U true CN208598395U (en) | 2019-03-15 |
Family
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| Application Number | Title | Priority Date | Filing Date |
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| CN201721245460.6U Withdrawn - After Issue CN208598395U (en) | 2017-09-26 | 2017-09-26 | A kind of bio-impedance analog meter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107582055A (en) * | 2017-09-26 | 2018-01-16 | 歌尔科技有限公司 | A kind of bio-impedance analog meter |
| CN112305313A (en) * | 2020-10-29 | 2021-02-02 | 北京林业大学 | Plant leaf impedance spectrum measuring device and method based on AD5933 chip |
-
2017
- 2017-09-26 CN CN201721245460.6U patent/CN208598395U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107582055A (en) * | 2017-09-26 | 2018-01-16 | 歌尔科技有限公司 | A kind of bio-impedance analog meter |
| CN107582055B (en) * | 2017-09-26 | 2024-02-09 | 歌尔科技有限公司 | Biological impedance simulator |
| CN112305313A (en) * | 2020-10-29 | 2021-02-02 | 北京林业大学 | Plant leaf impedance spectrum measuring device and method based on AD5933 chip |
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