JPS6079230A - Sensitivity correcting apparatus - Google Patents

Abstract

PURPOSE:To eliminate a weighing error even if sensitivity measurement is not performed a little at a time, by correcting sensitivity by automatically changing the same while following the change in a temp. and the number of measuring times. CONSTITUTION:The output value of a subtraction circuit 14 when a weighing tray 11 is stored in a weight-free memory circuit 17 and, subsequently, the output value of said circuit 14, when a reference wt. 16 is loaded, is stored in a weight memory circuit 19. A subtraction circuit 21 outputs the subtraction value to a division circuit 23. A measured value is divided by the reference wt. outputted from a reference wt. setting circuit 22 to calculate sensitivity. When the sensitivity of the division circuit 23 is set to S1 at a temp. of A1 deg.C and the sensitivity thereof to S2 at A2 deg.C, a division circuit 32 calculates (S2-S1)/(A2-A1) and the calculated value is stored in a sensitivity change memory circuit 33. Next, for example, when sensitivity is S3 at A3 deg.C, (S3-S2)/(A3-A2) is similarly stored in the sensitivity change memory circuit 33.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sensitivity correction device for a measuring device that measures various parameters such as weight, flow rate, and length.

In measuring devices that measure weight, flow rate, length, etc. with high precision, the definition sensitivity often fluctuates due to temperature changes and the passage of time, leading to deterioration in measurement accuracy.

For this reason, in the past, the sensitivity was measured at regular intervals or at regular temperature changes, the sensitivity was updated and stored in the sensitivity memory circuit 1, and the measurement signal (accounted signal) of the measuring device (for example, a scale) 2 was applied to the multiplier circuit 3. Multiply the sensitivity by .

However, with this method, if the sensitivity fluctuates with temperature change as shown in FIG. 2, for example, A.

℃, A2℃, A, 1: If we measure the sensitivity and update and store it in the sensitivity memory circuit 1, then AIk.

Actual sensitivity and error r, T! at A°C, z°C in the middle of A, ! occurs. Therefore, in order to reduce such errors, it is necessary to measure and update the sensitivity for each small temperature change as increments as possible. For this reason, in measuring devices that continuously measure a large number of objects to be measured at high speed, measurement is often interrupted to measure the sensitivity.
The amount (or reference) must be measured repeatedly, which hinders high-speed measurement.

SUMMARY OF THE INVENTION An object of the present invention is to correct the above-mentioned drawbacks and provide a sensitivity correction device in which errors are hardly caused even if the sensitivity measurement is not performed in small steps as described above.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 3 is a block diagram showing an embodiment of the present invention applied to a measuring device.

In Fig. 3, 11 is a weighing plate for placing the object to be measured, 12 is a weighing scale, and 13 is a measuring instrument 120 when measuring the zero point with the weighing plate empty. A hold circuit 14 is a subtraction circuit that calculates the zero point held in the zero point hold circuit 13 from the output signal of the meter 12.

15 is a portion 41 for loading the reference weight 16 onto the weighing pan 11.
It is a moving device.

17 is a weightless memory circuit that stores the output value of the subtraction circuit 14 when the weighing pan 11 is empty (no weight is loaded) via the switch 18;
This is a weight storage circuit that stores the output value of the # calculation circuit 14 when a load of 6 is applied via the switch 20. This is a sub-p circuit that subtracts the output value of the weight storage circuit 17 from the output value of the 21-digit weight storage circuit 19 and outputs the d1]1 constant value for the reference weight 16.

22 is a reference superimposition setting circuit for setting the true weight of the reference weight 16; 23 is a reference weight setting circuit for setting the reference weight from the reference type setting circuit 22; This is a division circuit that performs division and outputs the measurement sensitivity of the measuring instrument 12.

24 is an old sensitivity memory circuit that stores the measurement sensitivity of the meter 12 output from the divider circuit 23 when the switch 25 is closed; 26 is an old sensitivity memory circuit that stores the newly calculated sensitivity output from the divider circuit 23; This calculation circuit calculates the old sensitivity stored in the old sensitivity storage circuit 24 by 'llJ.

Ru.

27 - lit the signal corresponding to the ambient temperature of the indicator 12
28 is a salinity hold circuit that holds the temperature signal from temperature sensor 27; 31 is a V calculation circuit that subtracts the old temperature stored in the old temperature counter circuit 29 from the temperature held in the temperature hold circuit 28;

32V1, the difference between the new sensitivity output from the 11 circuit 26 and 1[-1h:,,□, degrees, and the difference between the new sensitivity output from the J circuit 31 and the 11'' temperature j Divided by j ↓ L - 1℃ This sensitivity change valley 3. -It is a division circuit that comes out.

33 records the output signal (MMe conversion degree) of the division circuit vr32 when the switch 34 is closed in synchronization with the front edges 25 and 3o. Sensitivity change degree recording circuit, 35r, i: Sensitivity change degree memory circuit 3
This is a multiplication circuit that multiplies the sensitivity value outputted from the subtraction circuit 31 by the difference 'fr between the value temperature and the old humidity outputted from the subtraction circuit 31.

36 is an addition circuit that adds the output value of the multiplication circuit 35 to the new sensitivity output from the division circuit 12123; 37 is a subtraction circuit 1;
38 is a display circuit that displays the weight of the object to be identified based on the output signal of the multiplication circuit 37; It is.

Switches 25, 30, and 34 each have a timing amount T.
It is closed by 1% T2 and T3 K. Figure 4 is the timing train T. It shows the relationship between s T1 , T2 and Ts.

Next, a description will be given of the work of the above embodiment.

The sensitivity Ef degree is set in the summer sensitivity change degree primary circuit 33 as follows.

That is, first, when the weighing pan 11 is empty (1), the subtraction circuit 14 is
The output value (Fn) is stored in the value storage circuit 17 representing the zero point held in the zero point hold circuit 13 from the w force value of the m unit 12. Next, the weighing pan 11 is loaded with the value ≦f, the weighing device 15
The reference weight 16 is loaded by the output value of the humidity/pigeon circuit 14 at this time, and the switch 20 is set to -n7←l, so that the branch power 1n (Δ匡ζ) is turned on.

Offshore calculation [iIl road 2 road 1 Kaburaki unique output value of circuit 19) σI'J @l old, 0-output alE of circuit 17
Input the value (reference weight ti; measured value for J16) to the deenergization 1 circuit 23. The division circuit 23 calculates the measured value of the reference weight Φ) 1116 from the subtraction circuit 21 by removing it with the reference weight output from the base tξ (positive amount setting et 7275~). 1,: number 12 1
m” Force IF.

As shown in Figure 5, the sensitivity is set to 1 to 1 as the temperature changes in the temperature curve, and when the sensitivity is constant 7 & 411, the sensitivity is A, and the temperature is 23 degrees. lit power (
1 (a=1') -Ass, -'c. Switches 25 and 30' (r-temporary, synchronous 1-temporary"qb
v +, te old birthstone Confucian stone (route 24 removed ij - circuit 23 h'
l l! Force (to S, i-H+: I want J: both Qr, temperature η temperature and cool 1 time 28 (l) from the bold boiled eggplant', nl (degrees A1) from the sensor 27
℃ is recorded in mouth temperature 8+3 f:i1 analysis 129.

After the next 1cior determination 114 Fltl has passed, weigh plate 1 in the same way.
1 [Empty the output of the calculation circuit 14, +
A new output value (
Sensitivity) is output.

As shown in FIG. 5, if the temperature at this time is A1°C and the output value (sensitivity) of the dividing circuit 23 is 82, then the temperature hold circuit 28 receives the temperature value A2 from the sensor 27. °C is held. Therefore, the rust calculation circuit 26 outputs the difference S2 Sl between the new sensitivity S2 from the division circuit 23 and the old sensitivity S1 stored in the old sensitivity memorization circuit 24. On the other hand, the subtraction circuit 31 outputs the difference A2-A between the temperature A2°C held in the temperature hold circuit 28 and the mouth temperature A1°C, and the division circuit 32 outputs (82Sr)/
(A2 At ) is calculated. When the switch 34 is temporarily closed by the timing signal T, the divider circuit 32
The output value (Sl Ss )/(A2 A,) is the feeling FJf
, the memory function is stored in the change degree memory circuit 33. Immediately after the timing signal T, the timing signals T1 and T are output, and the switches 25 and 30 are synchronously temporarily closed.
The temperature r stored in place of Sl and held in the temperature hold circuit 28;
2 memory UJ'17y 29 K At no substitute Ic k
Nihesa J.

Measure the illuminance (Sl) at 7 and 1 times as follows:
Kotoki, 'i'11 and the left sensitivity change degree<S, -Sl)
/(A2-A,> is set in the sensitivity change degree storage circuit 33)・
Sfl, 5tQ iW ITrql is input to path 35. Then, in the (4' 17-, l treatment of 1 full copy), the radiation Iσ is i!I11 of the sensitivity S2.
nJ"1 which does not change from temperature A2 at the specified time is temperature hold + i + path 28 i'j: A 2 ℃ is held)
t, 11 temperature h11 Since A2 °C is also stored in the fault circuit 29, the output value of the δ rise - circuit 31 is A2 - A, =
0, the output value of the multiplication (b) path 35 is ((Sl
811/(-A, 2 At) ) X 020. Therefore, addition + rq: ll゛? r26 output 1α
is the output value S2 of the division circuit 23 and the output value 0 of the multiplication circuit 35.
The value S2+ is the sum of

=S2 and η. Then, this value S2 is determined when the measured object is weighed 1.
The output value from the subtraction circuit 14 when placed on the i-plate 11 is multiplied by the multiplication circuit 37 and output as a display value Wj38 as a signal representing the sensitivity-corrected signal.

If the temperature rises by A2°C and reaches IZ°C, the temperature hold circuit 28 holds 1°C.
Since A2 DEG C. is stored in the circuit 29 of the old Ongonki 1, (A'-A2) is output from the Gan Misaki turner 31 to the multiplier circuit 35. Therefore, from the multiplication circuit 35 (
(Sl81)/IAtAl))x<A'-A
21 is inputted. As shown in Figure 5 (Sl Ss
)/(A2 Al l represents ■shoreline sen@drink connecting point P and point Q, so ((82-8,)/(A2-
A, ) ) Therefore, the adding circuit 3G outputs the length τV from the dividing circuit 23. The sum g obtained by adding the length τ■ to the cooling degree S2 is output.

For this reason, conventionally, the previously measured sensitivity S2 was output as the sensitivity, but the S
' is output as a sensitivity, and the sensitivity of the measurement signal is corrected in the multiplier circuit 37 based on this sensitivity.

Also, when the temperature drops from A2℃ to, for example, 17℃,
The zero circuit 31 has a negative value (7-A,), but the negative value 91
The output value of the circuit 35 ((St -8l l/(A, 2-A
l ) )X (, &-A, ) becomes a negative value, and S! The lowered value of J is output.

In this way, according to this circuit, the slope of the sensitivity change is set by seven sensitivity measurements, the previous one and the one before the previous one, and the adder circuit 36 outputs a sensitivity that follows the temperature change and has less error.

Then, as shown in Fig. 5, sensitivity measurement is carried out.
If y11 is A5℃ and the sensitivity is S, similarly / pkW change degree record 1, stock circuit 33 is (B3-82
1/(A3 Aa) is stored in the mouth temperature storage circuit 29.
The output value of the multiplier circuit 35 ((83-8t)/(A3-At)) x (A3 −
A, ) must be a positive value, and the value is added to 83 by the addition circuit 36.
is added.

In the above embodiment, a case has been described in which the sensitivity is corrected based on a temperature change, but for a platform whose sensitivity changes over time, correction may be performed based on the number of measurements. That is, in this case, as shown in FIG. 6, the output of the counter 41 that counts the number of weighing measurements is stored in the number-of-output storage circuit 43 via the switch 42, and the output B of the counter 41 at the time of the previous sensitivity measurement is stored.
, is stored in the output number storage circuit 43, and the difference (82B1) from the output B2 of the counter 41 during the previous I^ measurement is calculated.
of? )A output from the H circuit 31. Assuming that the sensitivity of the previous measurement is S7 and the sensitivity of the previous measurement is 82, the division circuit 32 outputs (L"s)/(B2 B,), and this value is set in the sensitivity change degree storage circuit 33 and output. B2 is stored in the number of times storage circuit 43.

Therefore, in subsequent weighing measurements, the sensitivity change degree storage circuit 33
The set value is multiplied by a value obtained by subtracting B2 from the number of subsequent calculation measurements and added to B2 by an addition circuit 36.

In addition, in the above embodiment, a case was explained in which the sensitivity was corrected using the degree of change in sensitivity.
- If x degree correction is performed, even more accurate degree correction can be made to l degree.

FIG. 8 shows the block diagram /1 which shows the case of such a one-degree correction, and FIG. 9 shows the timing signal T. ,T, ,T2 b
'l 3 % Indicates the tuner of T4.

Sin, subtraction times b in figure 8! P, 16, division circuit 22, switch 24.1 [& degree change storage circuit 23, multiplication circuit 25
By providing a subtraction circuit 41, a division circuit 42, a switch 43, a sensitivity change degree storage circuit 44, and a multiplication circuit 45 that have similar functions, changes in sensitivity changes can be realized. It is clear from the above explanation that the sensitivity can be corrected by using the degree 1, and 11 is 45Z), so 11 = wholesale! Further explanation will be omitted.

4. In the above embodiment, the case of a weight measuring device 1i will be explained next, but it is understood that lζ can also be applied to measuring devices such as length and flow valves, as tfi+j.

As explained above, in the sensitivity correction device of the present invention, the sensitivity is corrected by automatically changing it according to the temperature change or the number of measurements, so that measurement errors can be corrected without having to perform sensitivity measurements in small steps. It can be eliminated.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing a conventional sensitivity correction device, Fig. 2 is a graph showing an example of sensitivity fluctuation due to temperature, Fig. 3 is a block diagram showing an implementation f11 of the present invention, and Fig. 4 is a timing signal. Fig. 5 is a club for explaining the principle of sensitivity correction by non-invention, Fig. 6 is a block diagram showing other practical benefits and examples of non-invention, and Fig. 7 is the implementation shown in Fig. 6. It is a graph for explaining the principle of example sensitivity correction. FIG. 8 is a block diagram showing still another embodiment of the present invention, and FIG. 9 is a time chart showing timing signals. 11...Weighing plate, 12...Meter, 1
3...Zero point hold, 14...Subtraction circuit, 15...Weight driver, 1G...
Reference weight, 1γ... Weightless memory circuit, 18...
... Switch, 19 ... Weight storage circuit, 2
0...Switch, 21...Subtraction circuit,
22...Basic ring/gravity, said fixed anal sign, 23...
・・Excluding 1st verse, 24th... Old Sensitivity Edition ``Reidan Iro,''
25...Switch, 26...Wave/υ times de, 27...Temperature center, 28...Warm counterfeit hold lr! l Kano 1.29...Old temperature memory circuit, 30...Switch, 31...Subtraction circuit, 32...Divide %', [F! l road, 33
...Jl-7 degree change degree 1v circuit, 34...
...Switch, 35...P power circuit, 36...
...Addition circuit, 37...Multiplication direction h1 and 3
(1...display circuit.Specific applicant: Anritsu Electric Co., Ltd. agent, patent attorney: Seiji Hayayo Figure 1, Figure 2

Claims (1)

[Claims] a first division circuit that calculates sensitivity by dividing the measured value obtained from the measuring device by the degree above the standard when measuring the reference smoke; a subtraction circuit that calculates a sensitivity difference between the sensitivity output from the first division circuit due to temperature change, the number of measurements, or the passage of time; a second division circuit for dividing by a numerical value or an elapsed time difference value; a sensitivity change storage circuit for storing the output value of the second division circuit; and a sensitivity change storage circuit for storing the output value of the second division circuit;
．． 1. I! a first multiplier circuit that multiplies the degree of sensitivity change by the temperature difference value, the number of measurement values, or the elapsed time u(+t) by the difference value; a second multiplication circuit that multiplies the measured value by the output value of the addition circuit.