Laboratory reference

5.1 Familiarize with an equipment in the workplace, collect a measuring chart in obedience to lines. 1 and prepare devices to work.

5.2 In the mode of measuring of frequency define the threshold of sensitiveness (minimum tension which will provide a proof show on a board) and conduct the check of device on the indicated frequencies at tablas. 5.1.

5.3 To expect an absolute error the measured and maximum possible error, it is got results to write down at tablas. 5.1.

(δ_i - choose from passport information of the set generator)

Table 5.1 - Verification of the range of measured frequencies

f rkHz	Tc	U min	results on the board	absolute error Δ = F and – f r	maximum permissible error Δi = δi · f i	Output
0.1

 

5.4 In the mode of measuring of period to conduct the analogical measurings and calculations. To present results as table. 5.2.

 

Table 5.2 - Calibration of the measured range of periods

f rkHz (Tr)	T m	n	results on the board	U min	absolute error Δ = T and – T r	maximum permissible error Δi = δi · T i	output
0.1

 

5.5 Using technical descriptions of the set cymometer, to choose time of account which provides the least error in the mode of measuring of frequency.. 5.3.

Possible δ in the mode of frequency will expect after a formula 1.

 

Table 5.3 - Determination of the relative error of frequency measurement (error discrete)

f i,kHz	T count	results on the board	absolute error Δ = ± 1 / T,count	N	δ	Allowable δ	Output
0.1

 

5.6 Using technical descriptions of the set cymometer, to choose the parameters of the mode of measuring of period so that to provide the least error of measuring of period.. 5.4.

Possible δ in the mode of period will expect after a formula 2.

 

Table 5.4 - Determination of the relative error of measurement period (error discrete)

f rkHz (Tr)	T m	n	T cq	results on the scoreboard	absolute error Δ = ± T m / n	N	δ	Allowable δ	Output
0.1

6. Protocol of the laboratory work (№.... name...)

6.1 The purpose of the experiment.

6.2 List of equipment used in the Table. 6.1.

 

Table 6.1 - List of equipment used

Name of the device	type	serial number	Metrological characteristics
Accuracy	Range	Frequency

 

6.3 Scheme of the measurement

 

 

 

Type of calibrated frequency counter____________________________________

Visual inspection_________________________________________________

Testing_________________________________________________________

 

Calibration settings

 

Ambient temperature ___________________________________ ° C

Relative humidity __________________________________

Pressure mmHg_________________________________________

Time of pre-heating ____________________________________ min.

Supply voltage _________________________________________________ V.

The frequency of voltage _________________________________________ Hz.

 

6.4 Based on these results to draw conclusions about the verification carried out by frequency.

Verification Measurement frequency range investigated EFC _________

Conclusion:

Calibration of the measured range of periods studied EFC _________

Conclusion:

Determination of the relative error of measurement of the frequency of the EFC __________

Conclusion:

Determination of the relative error of the measurement period studied EFC __________

Conclusion:

The overall conclusion

is made ​​__________________________ Checking "___" _________ 20 __ y.

Name

 

Protocol tested: (Signature)