CN103926547A - Radio frequency identification tester calibration device and method - Google Patents

Abstract

The invention provides a radio frequency identification tester calibration device and method, said device comprising: an attenuator connected to the transmitting end of the radio frequency identification tester, a frequency meter connected to the output end of the attenuator, and an output end of the attenuator The connected microwave power meter, the induction coil connected with the transmitter of the radio frequency identification tester, the output terminal of the induction coil is connected with the digital oscilloscope, the vector signal analyzer connected with the transmitter of the radio frequency identification tester, and the radio frequency identification tester The receiving end is connected to a signal generator, and the output end of the signal generator is respectively connected to the receiving end and the input end of the microwave power meter. The invention can accurately calibrate the radio frequency identification tester used in the radio frequency identification card test.

Description

Radio Frequency Identification Tester Calibration Device and Method

technical field

The invention relates to a calibration device and method for a radio frequency identification tester.

Background technique

Radio Frequency Identification (RFID) testers are widely used in the R&D, production and testing of RFID cards. RFID testers include RFID transmitters and RFID receivers. The transmitters emit the required RFID signals, and the RFID cards receive the RFID signals. , After decoding, the signal is sent back, and the RF tester receives the signal sent back by the RFID card and demodulates it correctly. Therefore, whether the radio frequency identification tester is accurate and reliable will be very important for the testing of RFID cards. So far, the country has not promulgated radio frequency identification (RFID) tester calibration specifications or verification procedures.

Contents of the invention

The purpose of the present invention is to provide a radio frequency identification tester calibration device and method, which can accurately calibrate the radio frequency identification tester used in the radio frequency identification card test.

In order to solve the above problems, the present invention provides a radio frequency identification tester calibration device, comprising:

An attenuator connected to the transmitting end of the radio frequency identification tester, the input end of the attenuator is connected to the transmitting end, and a frequency meter connected to the output end of the attenuator, the frequency meter is used to pass the attenuation The device reads the count value of the output frequency of the radio frequency identification tester;

A microwave power meter connected to the output end of the attenuator, the microwave power meter is used to obtain the count value of the output power of the radio frequency identification tester through the attenuator;

An induction coil connected to the transmitting end of the radio frequency identification tester, the input end of the induction coil is connected to the transmitting end, the output end of the induction coil is connected to a digital oscilloscope, and the digital oscilloscope is used to measure the induction coil The output voltage amplitude;

A vector signal analyzer connected to the transmitter of the radio frequency identification tester, the vector signal analyzer is used to obtain the modulation index, frequency error and output signal waveform parameters of the radio frequency identification tester;

A signal generator connected to the receiving end of the radio frequency identification tester, used to output power value and reader signal to the radio frequency identification tester, the output end of the signal generator is connected with the input end of the receiving end and the microwave power meter respectively connect.

Further, in the above device, the induction coil is a PCD antenna group or a VCD antenna group.

Further, in the above device, for a radio frequency identification tester conforming to the ISO/IEC14443 standard, the induction coil is a PCD antenna group.

Further, in the above device, for a radio frequency identification tester conforming to the ISO/IEC15693 standard, the induction coil is a VCD antenna group.

According to another aspect of the present invention, a radio frequency identification tester calibration method is provided, using the radio frequency identification tester calibration device described above, the method comprising:

After setting the output frequency and output power of the radio frequency identification tester, the radio frequency identification tester outputs a continuous, unmodulated signal to the frequency meter through the attenuator, and reads the count value of the output frequency from the frequency meter;

After setting the output frequency and output power of the radio frequency identification tester, the radio frequency identification tester outputs a continuous, unmodulated signal to the microwave power meter through the attenuator, and reads the count value of the output power from the microwave power meter. The output power of the radio frequency identification tester is determined by the count value of the output power and the attenuation value of the attenuator;

The input impedance of the digital oscilloscope is selected as high resistance, after the output signal field strength of the radio frequency identification tester is set, the radio frequency identification tester outputs a continuous, unmodulated signal to the induction coil, and the time scale and the time scale of the digital oscilloscope are adjusted. After adjusting the vertical amplitude and scanning time of the digital oscilloscope, read the output voltage amplitude of the induction coil measured by the digital oscilloscope, and determine the output field strength of the radio frequency identification tester according to the output voltage amplitude ;

Select the state of the radio frequency identification tester as the state of the reader simulator, set the center frequency of the radio frequency identification tester to 915MHz, and the output power to 0dBm, the radio frequency identification tester outputs signals to the vector signal analyzer, and the vector signal analyzer Select the state of radio frequency identification analysis, set the center frequency of the vector signal analyzer to 915MHz, the output level to 0dBm and the trigger mode to the intermediate frequency amplitude and select the forward direction and the corresponding rate, and the analysis result of the vector signal analyzer is After the command, read the modulation index, frequency error and output signal waveform parameters of the radio frequency identification tester from the result category summary screen of the vector signal analyzer;

After setting the output frequency and output level of the signal generator, the signal generator outputs a continuous wave signal, after reading the output power of the signal generator from the microwave power meter, keep the output power of the signal generator unchanged and send it to the The output of the radio frequency identification tester, the working state of the radio frequency identification tester is selected for power measurement, the receiving frequency of the radio frequency identification tester is set to the same frequency as the output frequency of the signal generator, and the expected receiving level is set to be greater than or After being equal to the output power of the signal generator read by the microwave power meter, read the received power received from the signal generator from the radio frequency identification tester;

Set the center frequency of the signal generator as 915MHz, output power as 0dBm, and select the output type as the signal of the analog reader and the trigger type as single trigger, select the reader consistency test panel in the radio frequency identification tester, and The center frequency of the RFID tester is 915MHz, and the analysis level is 0dBm. After setting the trigger mode to analyze the rising edge trigger, press the acquisition key of the RFID tester to obtain the signal, and trigger the signal generator to send a reading to the RFID tester. The radio frequency identification tester selects a time range for the sampled reader signal and analyzes it to obtain a reader analysis signal, and reads the modulation index from the reader analysis signal.

Further, in the above method, in the step of determining the output power of the radio frequency identification tester according to the count value of the output power and the attenuation value of the attenuator, the output power of the radio frequency identification tester is determined according to the following formula:

Ps=P+A,

Among them, Ps represents the output power of the radio frequency identification tester, the unit is dBm, P represents the reading of the power meter, the unit is dBm, A represents the attenuation value of the attenuator, the unit is dB.

Further, in the above method, in the step of determining the output field strength of the radio frequency identification tester according to the output voltage amplitude, the output field strength of the radio frequency identification tester is determined according to the following formula:

H=V/k _C ,

Wherein, H is the output field strength of the radio frequency identification tester, the unit is A/m, V is the output voltage amplitude of the induction coil measured by the digital oscilloscope, the unit is mVp-p, _kC is the correction factor of the induction coil.

Compared with the prior art, after the present invention sets the output frequency and output power of the radio frequency identification tester, the radio frequency identification tester outputs a continuous, unmodulated signal to the frequency meter through the attenuator, and reads the frequency meter from the frequency meter. The count value of the output frequency; after setting the output frequency and output power of the radio frequency identification tester, the radio frequency identification tester outputs a continuous, unmodulated signal to the microwave power meter through the attenuator, and reads the output power from the microwave power meter Count value, determine the output power of the RFID tester according to the count value of the output power and the attenuation value of the attenuator; The input impedance of the digital oscilloscope is selected as high resistance, and the output signal field strength of the RFID tester is set Finally, the radio frequency identification tester outputs a continuous, unmodulated signal to the induction coil, adjusts the time scale and voltage scale of the digital oscilloscope to the position, adjusts the vertical amplitude and scan time of the digital oscilloscope, and reads the number The output voltage range of the described induction coil measured by the oscilloscope determines the output field strength of the radio frequency identification tester according to the output voltage range; the state of the radio frequency identification tester is selected as the reader simulator state, and the radio frequency identification tester is set After the center frequency is 915MHz and the output power is 0dBm, the radio frequency identification tester outputs signals to the vector signal analyzer, select the state of the vector signal analyzer as radio frequency identification analysis, set the center frequency of the vector signal analyzer to 915MHz, output power Set level as 0dBm and trigger mode as intermediate frequency amplitude, select forward direction and corresponding rate, and select the analysis result of the vector signal analyzer as the command, read the modulation of the radio frequency identification tester from the result type summary screen of the vector signal analyzer Index, frequency error and output signal waveform parameters; after setting the output frequency and output level of the signal generator, the signal generator outputs a continuous wave signal, and after reading the output power of the signal generator from the microwave power meter, keep the signal The output power of the generator is constant and output to the radio frequency identification tester, the working state of the radio frequency identification tester is selected for power measurement, and the receiving frequency of the radio frequency identification tester is set to the same frequency as the output frequency of the signal generator After the frequency and the expected receiving level are set to be greater than or equal to the output power of the signal generator read by the microwave power meter, read the received power received from the signal generator from the radio frequency identification tester; set the The center frequency of the above-mentioned signal generator is 915MHz, the output power is 0dBm, and the output type is selected as the signal of the analog reader and the trigger type is single trigger, and the reader conformance test panel in the radio frequency identification tester is selected, and the radio frequency identification The center frequency of the tester is 915MHz, and the analysis level is 0dBm. After setting the trigger mode to analyze the rising edge trigger, press the acquisition key of the RFID tester to acquire the signal, and trigger the signal generator to send a reader signal to the RFID tester. , the radio frequency identification tester selects the time range for the sampled reader signal and analyzes it to obtain the reader analysis signal, reads the modulation index from the reader analysis signal, and can test the radio frequency identification card The RFID tester used in the test was precisely calibrated.

Description of drawings

Fig. 1 is a schematic diagram of device connection for output frequency calibration of a radio frequency identification tester according to an embodiment of the present invention;

Fig. 2 is a schematic diagram of device connection for output power calibration of a radio frequency identification tester according to an embodiment of the present invention;

Fig. 3 is a schematic diagram of the device connection of the output field strength calibration of the radio frequency identification tester according to an embodiment of the present invention;

4 is a schematic diagram of device connection for calibrating the modulation index of the transmitting end of the radio frequency identification tester according to an embodiment of the present invention;

5 is a schematic diagram of device connection for receiving power calibration of a radio frequency identification tester according to an embodiment of the present invention;

Fig. 6 is a schematic diagram of device connection for calibration of modulation index at the receiving end of the radio frequency identification tester according to an embodiment of the present invention.

Detailed ways

In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Embodiment one

The present invention provides a radio frequency identification tester calibration device, comprising:

As shown in Figure 1, the attenuator connected with the transmitter 11 of the radio frequency identification tester 1, the input terminal of the attenuator 2 is connected with the transmitter 11, and the frequency meter connected with the output terminal of the attenuator 2 3, the frequency meter 3 is used to read the count value of the output frequency of the radio frequency identification tester 1 through the attenuator 2;

As shown in Figure 2, the microwave power meter 4 connected with the output end of the attenuator 2, the microwave power meter 4 is used to obtain the count value of the output power of the radio frequency identification tester 1 by the attenuator 2;

As shown in Figure 3, the induction coil that is connected with the transmitting end 11 of radio frequency identification tester 1, the input end of described induction coil 5 is connected with described transmitting end 11, and the output end of described induction coil 5 is connected with digital oscilloscope 6 , the digital oscilloscope 6 is used to measure the output voltage amplitude of the induction coil 5; preferably, the induction coil 5 is a PCD antenna group or a VCD antenna group, wherein, for a radio frequency identification tester conforming to the ISO/IEC14443 standard, The induction coil is a PCD antenna group; for a radio frequency identification tester meeting the ISO/IEC15693 standard, the induction coil is a VCD antenna group;

As shown in Figure 4, the vector signal analyzer 7 that can analyze RFID signal that is connected with the transmitter 11 of radio frequency identification tester 1, described vector signal analyzer 7 is used for obtaining the modulation index of radio frequency identification tester 1, frequency error and output signal waveform parameters;

As shown in Figures 5 and 6, the signal generator 8 connected to the receiving end 12 of the radio frequency identification tester 1 is used to output power values and reader signals to the radio frequency identification tester 1, and the output terminal of the signal generator 8 They are respectively connected to the receiving end 12 and the input end of the microwave power meter 4 .

This embodiment can accurately calibrate the radio frequency identification tester used in radio frequency identification card testing.

Embodiment two

As shown in Figures 1 to 6, the present invention also provides another radio frequency identification tester calibration method, using the radio frequency identification tester calibration device of Embodiment 1, the method comprising:

Step 1, after setting the output frequency and output power of the radio frequency identification tester, the radio frequency identification tester outputs a continuous, unmodulated signal to the frequency meter through the attenuator, and reads the count value of the output frequency from the frequency meter; specifically Yes, the instrument connection in this step is shown in Figure 1;

Step 2: After setting the output frequency and output power of the radio frequency identification tester, the radio frequency identification tester outputs a continuous, unmodulated signal to the microwave power meter through the attenuator, and reads the count value of the output power from the microwave power meter , determine the output power of the RFID tester according to the count value of the output power and the attenuation value of the attenuator; specifically, the instrument connection in this step is as shown in Figure 2; preferably, according to the count value of the output power In the step of determining the output power of the RFID tester with the attenuation value of the attenuator, the output power of the RFID tester is determined as follows:

Ps=P+A,

Among them, Ps represents the output power of the radio frequency identification tester, the unit is dBm, P represents the reading of the power meter, the unit is dBm, A represents the attenuation value of the attenuator, the unit is dB;

Step 3, select the input impedance of the digital oscilloscope as high resistance, set the output signal field strength of the radio frequency identification tester, the radio frequency identification tester outputs a continuous, unmodulated signal to the induction coil, and adjust the time of the digital oscilloscope After adjusting the vertical amplitude and scanning time of the digital oscilloscope, read the output voltage amplitude of the induction coil measured by the digital oscilloscope, and determine the radio frequency identification tester according to the output voltage amplitude. Output field strength; specifically, for a 13.56MHz radio frequency identification card, the calibration output signal is the RF field strength, and for an RFID tester that complies with the ISO/IEC14443 standard, use a PCD (PCD Proximity coupling device) antenna group; for The RFID tester conforming to the ISO/IEC15693 standard uses a VCD (VCD proximity coupling device) antenna group, as shown in Figure 3, connects the transmitting end of the RFID tester to the input end of the PCD transmitting antenna, and calibrates the coil The output is connected to the oscilloscope, the input impedance of the oscilloscope is selected as high impedance, set the field strength of the output signal of the RFID tester, output the unmodulated signal (that is, the CW signal), and adjust the time scale and voltage scale of the oscilloscope to a suitable position. Properly adjust the vertical amplitude and scan time of the oscilloscope, read the measured induction coil output voltage amplitude Vp-p of the oscilloscope, preferably, in the step of determining the output field strength of the radio frequency identification tester according to the output voltage amplitude, according to the following formula Determine the output field strength of the RFID tester:

H=V/k _C ,

Wherein, H is the output field strength of the radio frequency identification tester, the unit is A/m, V is the output voltage amplitude of the induction coil measured by the digital oscilloscope, the unit is mVp-p, and _kC is the correction factor of the induction coil, _kC = 900mVp-p (A/m) (rms);

Step 4: Select the state of the RFID tester as the state of the reader emulator (ReaderEmulator), set the center frequency of the RFID tester to 915MHz, and the output power to 0dBm, and then the RFID tester outputs signals to the vector signal analyzer , select the state of the vector signal analyzer as radio frequency identification (RFID) analysis, set the center frequency of the vector signal analyzer as 915MHz, the output level as 0dBm and the trigger mode as IF mag and select the forward direction (Forward Reader to card (i.e. Interrogator→Tag) and the corresponding rate, and after selecting the analysis result of the vector signal analyzer as the command (command), read the RF from the result type summary screen (ASK summary) of the vector signal analyzer Identify the modulation index, frequency error, and output signal waveform parameters of the tester; specifically, as shown in Figure 4, connect the output of the RFID tester to the signal input of the vector signal analyzer through a cable, and select the Reader Emulator for the RFID tester. Select a standard such as EPC global class-1G-2, set the center frequency to 915MHz, set the output power to 0dBm, send an appropriate command, such as Query, send a signal, select RFID analysis for the vector signal analyzer, and set the center frequency to 915MHz , set the output level to 0dBm, set the trigger mode to IF mag, select the standard consistent with the RFID tester, such as EPC global class-1Generation2, and select the forward direction (Forward reader to card, ie Interrogator→Tag) and Select the corresponding rate, select the analysis result as command, and read the test result from the result as ASKsummary. Modulation index, and frequency error, and record;

Step five, after setting the output frequency and output level of the signal generator, the signal generator outputs a continuous wave signal, and after reading the output power of the signal generator from the microwave power meter, keep the output power of the signal generator unchanged And to the output of the radio frequency identification tester, the working state of the radio frequency identification tester is selected for power measurement, the receiving frequency of the radio frequency identification tester is set to the same frequency as the output frequency of the signal generator, and the expected receiving level is set After being greater than or equal to the output power of the signal generator read by the microwave power meter, read the received power received from the signal generator from the radio frequency identification tester; specifically, as shown in Figure 5, The signal generator outputs a continuous wave signal, the output frequency is set to f, and the output level of the signal generator is adjusted so that the indication value of the microwave power meter is Ps. Then, the output of the signal generator remains unchanged, and the RF cable and the RFID test The receiving port of the RFID tester is connected, the RFID tester selects power measurement, the receiving frequency is set to f, the expected receiving level is greater than (or equal to) Ps, and the measured power is read from the RFID tester;

Step 6: Set the center frequency of the signal generator to 915MHz, the output power to 0dBm, and select the output type as the signal of the analog reader (Reader Emulator) and the trigger type as single trigger (single), select the radio frequency identification tester Reader conformance test panel (Readercomformance test panel), and the center frequency of the RFID tester is 915MHz, the analysis level is 0dBm, after setting the trigger mode (Trigger mode) to analyze rising edge trigger (analyze rising edge), Press the acquisition key (Acquire) of the RFID tester to acquire the signal, trigger the signal generator to send a reader signal to the RFID tester, and the RFID tester selects the time range for the sampled reader signal and analyzes it to obtain the reader Analyze the signal, and read the modulation index (Mod depth) from the reader analysis signal (Readeranalysis). Specifically, as shown in Figure 6, connect the output of the signal generator to the receiving port of the RFID tester, the selection standard of the signal generator is EPC globalclass-1Generation2, set the center frequency to 915MHz, and the output power to 0dBm, select the required Output type, Reader Emulator is the signal of the simulated reader, trigger type Trigger Type select single (No Retrigger), RFID tester selects Reader conformance test panel (EPCUHF Gen2), set the center frequency of the RFID tester to 915MHz, and the analysis level to 0dBm , set the Trigger mode to analyze rising edge, then press Acquire to acquire the signal, press the signal generator trigger (trigger) to send the reader signal once, select the appropriate time range for the sampled signal to analyze in the RFID analyzer, and observe the test results, Read Mod depth from Reader analysis.

In detail, the test results of the RFID tester of an embodiment of the present invention are as follows:

1) RFID tester output frequency

Nominal value (MHz) Measured value (MHz) uncertainty 13.56 13.55996 U _rel =1×10 ^-6 (k=2) 915 914.9997 U _rel =1×10 ^-6 (k=2) 2450 2449.993 U _rel =1×10 ^-6 (k=2)

2) RFID tester output power

3) RFID tester output field strength

Frequency (MHz) Field strength (V/m) Measured value (V/m) uncertainty 13.56 5 5.1 6%

4) RFID tester modulation index (EPC UHF GEN2)

Frequency (MHz) measured value uncertainty 915 90.1% U _rel =2%(k=2)

5) Output signal waveform parameters (EPC UHF GEN2)

6) Power measurement

7) Modulation index measurement (EPC UHF GEN2)

Frequency (MHz) standard value Indicative value 915 90.1% 90.6%

The invention can accurately calibrate the radio frequency identification tester used in the radio frequency identification card test.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other. As for the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and for relevant information, please refer to the description of the method part.

Professionals can further realize that the units and algorithm steps described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the relationship between hardware and software Interchangeability. In the above description, the composition and steps of each example have been generally described according to their functions. Whether these functions are executed by hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may use different methods to implement the described functions for each specific application, but such implementation should not be regarded as exceeding the scope of the present invention.

Obviously, those skilled in the art can make various changes and modifications to the invention without departing from the spirit and scope of the invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and equivalent technologies thereof, the present invention also intends to include these modifications and variations.

Claims (7)

1. a radio-frequency (RF) identification tester calibration device, is characterized in that, comprising:

The attenuator being connected with the transmitting terminal of radio-frequency (RF) identification tester, the input end of described attenuator is connected with described transmitting terminal, with the frequency meter that the output terminal of described attenuator is connected, described frequency meter is for reading the count value of the output frequency of radio-frequency (RF) identification tester by described attenuator;

With the microwave power meter that the output terminal of described attenuator is connected, described microwave power meter is for obtaining the count value of the output power of radio-frequency (RF) identification tester by described attenuator;

The inductive coil being connected with the transmitting terminal of radio-frequency (RF) identification tester, the input end of described inductive coil is connected with described transmitting terminal, the output terminal of described inductive coil is connected with digital oscilloscope, and described digital oscilloscope is for measuring the output voltage amplitude of described inductive coil;

With the VSA that the transmitting terminal of radio-frequency (RF) identification tester is connected, described VSA is for obtaining modulation index, frequency error and the signal output waveform parameter of radio-frequency (RF) identification tester;

The signal generator being connected with the receiving end of radio-frequency (RF) identification tester, for to radio-frequency (RF) identification tester output power value and reader signal, the output terminal of described signal generator is connected with the input end of described receiving end and microwave power meter respectively.

2. radio-frequency (RF) identification tester calibration device as claimed in claim 1, is characterized in that, described inductive coil is PCD antenna sets or VCD antenna sets.

3. radio-frequency (RF) identification tester calibration device as claimed in claim 2, is characterized in that, for the radio-frequency (RF) identification tester that meets ISO/IEC14443 standard, described inductive coil is PCD antenna sets.

4. radio-frequency (RF) identification tester calibration device as claimed in claim 2, is characterized in that, for the radio-frequency (RF) identification tester that meets ISO/IEC15693 standard, described inductive coil is VCD antenna sets.

5. a radio-frequency (RF) identification tester calibration steps, is characterized in that, adopts the radio-frequency (RF) identification tester calibration device as described in claim 1～4 any one, and described method comprises:

Arrange after the output frequency and output power of radio-frequency (RF) identification tester, radio-frequency (RF) identification tester is exported signal continuous, that do not add modulation by attenuator to frequency meter, reads the count value of described output frequency from frequency meter;

Arrange after the output frequency and output power of radio-frequency (RF) identification tester, radio-frequency (RF) identification tester is exported signal continuous, that do not add modulation by attenuator to microwave power meter, read the count value of described output power from microwave power meter, determine the output power of radio-frequency (RF) identification tester according to the pad value of the count value of described output power and attenuator;

The input impedance of described digital oscilloscope is chosen as to high resistant, arrange after the output signal field intensity of radio-frequency (RF) identification tester, radio-frequency (RF) identification tester is exported signal continuous, that do not add modulation to inductive coil, adjust the time scale of digital oscilloscope and the position that voltage scale arrives, regulate digital oscilloscope vertical size and after sweep time, read the output voltage amplitude of the described inductive coil of described digital oscilloscope measurement, determine the output field intensity of radio-frequency (RF) identification tester according to described output voltage amplitude;

Be reader simulator state by the condition selecting of radio-frequency (RF) identification tester, the centre frequency of setting radio-frequency (RF) identification tester is 915MHz, after output power is 0dBm, radio-frequency (RF) identification tester is to VSA output signal, be radio-frequency (RF) identification analysis by the condition selecting of VSA, the centre frequency of setting VSA is 915MHz, output level is that 0dBm and triggering mode are intermediate frequency amplitude and select forward direction and corresponding speed, and select the analysis result of VSA for after ordering, gather from the result kind of VSA the modulation index that reads radio-frequency (RF) identification tester picture, frequency error and signal output waveform parameter,

After the output frequency and output level of setting signal generator, signal generator output continuous wave signal, from the output power of described microwave power meter read signal generator, the output power of holding signal generator is constant and to described radio-frequency (RF) identification tester output, the duty of radio-frequency (RF) identification tester is selected to power measurement, the receive frequency of radio-frequency (RF) identification tester is set to the frequency identical with the output frequency of described signal generator, expection incoming level is set to be greater than or equal to after the output power of the signal generator that described microwave power meter reads, from radio-frequency (RF) identification tester, read the received power receiving from described signal generator,

The centre frequency that described signal generator is set is 915MHz, output power is 0dBm, and select output type be simulation reader signal and trigger type be single trigger, select the reader uniformity test panel in radio-frequency (RF) identification tester, and the centre frequency of radio-frequency (RF) identification tester is 915MHz, analysis level is 0dBm, trigger mode is set for analyzing after rising edge triggering, the key that obtains of pressing radio-frequency (RF) identification tester obtains signal, trigger signal generator is to send a reader signal to radio-frequency (RF) identification tester, radio-frequency (RF) identification tester obtains reader analytic signal to sampling the reader signal select time scope obtaining and analyzing, from described reader analytic signal, read modulation index.

6. radio-frequency (RF) identification tester calibration steps as claimed in claim 5, it is characterized in that, determine according to the pad value of the count value of described output power and attenuator in the step of output power of radio-frequency (RF) identification tester, the output power of described radio-frequency (RF) identification tester is pressed following formula and is determined:

Ps=P+A，

Wherein, Ps represents the output power of radio-frequency (RF) identification tester, and unit is dBm, and P represents power meter reading, and unit is dBm, and A represents the pad value of attenuator, and unit is dB.

7. radio-frequency (RF) identification tester calibration steps as claimed in claim 5, is characterized in that, determines in the step of output field intensity of radio-frequency (RF) identification tester according to described output voltage amplitude, determines the output field intensity of radio-frequency (RF) identification tester according to following formula:

H=V/ｋ _Ｃ，

Wherein, H is the output field intensity of radio-frequency (RF) identification tester, the A/m of unit, and V is the output voltage amplitude of the inductive coil of described digital oscilloscope measurement, unit is mVp-p, k _cfor the correction factor of described inductive coil.