JPS63255614A - Frequency measuring apparatus - Google Patents

Abstract

PURPOSE:To perform accurate conversion and to also enhance setting accuracy, by setting the numerical value data relating to an input frequency value and the data of the output value having functional relation thereto to automatically operate an input/output ratio. CONSTITUTION:For example, when an output display value is desired to be displayed as BHz when an input frequency value is AHz, A is set to and stored in the input value memory part 9I of an internal backup memory 9 and B is set to and stored in the memory part 9D of the output display value. When the input value and the output display value are set, these values are read from the memory parts 9I, 9D and the ratio of both of them is operated by a ratio operation circuit 10. The calculated ratio value is stored in a register 11 and supplied to a display operation part 12. The input frequency signal from an input terminal 13 is supplied to a frequency measuring circuit 14 and the frequency thereof is calculated. The calculated frequency data is supplied to the operation part 12 and multiplied by the ratio value from the register 11 to be altered to the display value corresponding to the input/output ratio and said display value is displayed on a display device 2 through a display control circuit 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a frequency measuring device that measures a frequency corresponding to, for example, a rotational speed and is capable of outputting or displaying the frequency in various different unit systems.

[Summary of the invention]

This invention automatically calculates the input/output ratio by setting numerical information related to the input frequency value and information on the output value that has a functional relationship with the numerical information, and outputs while maintaining the specified functional relationship with the input information. Alternatively, it can be displayed, making it easy to set the unit system when it is possible to output and display in multiple different unit systems, and also to provide an almost accurate ratio even when the input/output ratio is a decimal. It is made so that it can be easily obtained.

[Conventional technology]

For example, when detecting the rotational speed of a rotating body, this is done by measuring the frequency of pulses from a pulse generator provided in relation to the rotating body.

In this case, in addition to the detected frequency itself, as the rotational speed output or its display value, there are many cases where it is desired to perform a unit check on (rpm) or output a value obtained by multiplying the input by a predetermined ratio. 2. Description of the Related Art Frequency measuring devices that can set the input/output ratio are conventionally known.

In conventional devices, this input/output ratio was set by setting the ratio itself. For example, incoming crab outgoing car 2
If 2=7 is desired, 22/7=3.14... is set.

[Problem that the invention seeks to solve]

However, this method of directly inputting the input/output ratio is cumbersome as it requires the setter to calculate the input/output ratio before performing the setting operation. I sometimes made operational errors. Furthermore, if the set ratio is a decimal number and is not divisible, it is necessary to round it down to an appropriate number of significant digits before inputting it, which has the disadvantage that the accuracy of the measurement output deteriorates accordingly.

[Means for solving problems]

In this invention, an input information setting means sets numerical information related to an input frequency value, and an output information setting means sets information on an electrical output value or an output display numerical value having a functional relationship with the input frequency value. , a means for calculating an input/output ratio from the set numerical information, and an electrical output or a display output based on the calculation result while maintaining the input frequency information and the designated functional relationship.

[Effect]

For example, when setting input crab output=22:1, the input information setting means sets "22" and the output information setting means sets "7". Then, by the calculation means, 22
/7 is obtained, and this is multiplied by the input frequency information to derive the electrical output and display output.

It is only necessary to set the input information and output information themselves, and there is no need for the setter to calculate the ratio, making input operations easier and more accurate.

〔Example〕

FIG. 1 is a block diagram of an example of the apparatus of this invention. In the figure, (IL) and (IR) are input setting switches. Further, (2) is a display section consisting of a liquid crystal display or the like, and in this example, as shown in FIG. 2, five digits can be displayed using Japanese character-shaped display segments.

(3) is a display control circuit that supplies a display control signal to the display section (2).

In this case, the switch (IL) is for switching the mode and setting digit, and as shown in Figure 3A,
When this switch (IL) is turned on for a relatively long time (hereinafter referred to as long-on), this is detected by the timer circuit (4), and the detection signal L1 is obtained from the timer circuit (4). The signal is supplied to the mode setting circuit (5). From this mode setting circuit (5), a detection signal L
Each time 1 is input, a mode signal MODE for changing the mode sequentially and cyclically is obtained, and this mode signal MODE is supplied to the display control circuit (3), and the mode is switched according to this signal MODE. .

This signal MODE is also supplied to a numerical value and decimal point position setting circuit (71), which will be described later.

Further, when this switch (IL) is turned on for a relatively short period of time (hereinafter referred to as short-on) as shown in FIG. 3B, and this is detected by the timer circuit (4), the detection signal S1 is obtained from this, and this signal S1 is supplied to the set digit switching circuit (6). This setting digit switching circuit (6)
obtains a digit switching signal that sequentially changes the digits of a five-digit numerical value each time the detection signal S1 is input. This digit switching signal is supplied to the display control circuit (3) and also to the numerical value and decimal point position setting circuit (7). This setting circuit (7) has a register for storing a five-digit numerical value and a decimal point position, and a numerical value setting digit and a decimal point position in this register are designated by a digit switching signal.

The switch (IR) is used to change the numerical value and decimal point position, and when this switch (IR) is turned on for a long time as shown in Figure 3A, it is detected by the timer circuit (8). , from this, the switching signal L according to the long on time
2 is supplied to the numerical value and decimal point setting circuit (7), and in this setting circuit (7), the value of the digit set by the digit switching signal from the setting digit switching means (6) is set as the ON time of the switch (IR). During this period, the value is changed continuously and cyclically from "0" to "9". Alternatively, the decimal point position is changed sequentially and cyclically from the highest digit to the lowest digit.

Also, when the switch (IR) is turned on as shown in Figure 3B, this is detected by the timer circuit (8), and from this a single pulse-like switching signal S2 is obtained, which is used to display the numerical value and the decimal point. The signal is supplied to the position setting circuit (7), and the numerical value of the set digit is changed by 1, or the decimal point position is shifted by 1.

The numerical value and decimal point position information set in the register of the setting circuit (7) are supplied to the display control circuit (3). In addition, the setting circuit (7) is interconnected with the internal backup memo (January 9), and the set input value and output display value are
This memo will be stored on January 9).

For example, when the input frequency value is 1.2345 tlz, if you want to display the output display value as 3741.711z, 1.2345 is set and stored in the input value storage section (9■) of the memo January 9), 3741 and 7 are set and stored in the output display value storage section (9D). When the input value and output display value are set, these values are read out from the memory sections (9I) and (90) of this memo (January 9), and the ratio of the two is calculated in the ratio calculation circuit (10). Ru. The determined ratio value is stored in the register (11). The ratio value stored in this register (11) is displayed in the display calculation section (12).
is supplied to

On the other hand, the input frequency signal from the input terminal (13) is supplied to a frequency measuring circuit (14), and its frequency is determined. The obtained frequency information is supplied to the display calculation circuit (12), multiplied by the ratio value from the register (11), and changed to a display value according to the input/output ratio, which is then sent to the display control circuit (3). is displayed on the display section (2) via.

In this device, the switches (IL) and (IR) may be pushbutton switches, but since anyone can input and operate these types of switches, the set values can be changed even by outsiders. In this example, switches (IL) and (IR) that perform special input operations are used,
We are trying to avoid this inconvenience.

That is, Fig. 4 shows the external appearance of the frequency measuring device of this example, Fig. 4 A is a perspective view of this device as seen from the front panel side, and Fig. 4 B is a diagram for explaining the input method. be.

In FIG. 4A, (21) shows the entire body of this device, and (22) is the front panel. In this example, the front panel (22) is provided with a liquid crystal display section (23) corresponding to the display section (2).

In this example, marks (24M) and (25M) as shown in FIG. B are attached to the left and right surfaces of the liquid crystal display section (23) of the front panel (22).

There is a switch (
Reed switch (24) corresponding to IL) and (IR)
and (25) are provided as shown in FIG. Although not shown, the reed switches (24) and (25) are connected to timer circuits (4) and (8) in the National Athletic Meet (21). Marks (24M) and (25M) indicate the positions of the reed switches (24) and (25).

This mark (24M) (25M) may also serve as a company logo or other display, for example.

Using these marks (24M) and (25M) as landmarks, information is input using the reed switches (24) and (25) in the following manner.

That is, as shown in FIG.
7) and bring it close to the mark (24M). Then, an induced current flows through the coil of the reed switch (24), turning the reed switch (24) on. Then, when the permanent magnet (27) is moved away, the magnet (24) is turned off again. Similarly, the reed switch (25) can be turned on and off by moving the permanent magnet (7) closer to or farther away, and information can be input.

By lengthening the time during which the permanent magnet (27) is held close, a long-on operation is performed, and by shortening it, a similar-on operation is performed. In addition, Reed Suisochi (
24) A Hall element may be provided in place of (25), and long-on or short-on may be detected based on the output voltage of the Hall element.

Further, an electromagnet may be used instead of the permanent magnet (27), and the electromagnet may be turned on for a long time or for a short time depending on the length of time the power is turned on.

Next, the numerical value setting operation and the display at that time in this example will be explained below with reference to FIG.

First, by bringing the magnet (7) close to the mark (24M'), the reed switch (24), that is, the switch (I
Turn L) on long. Then, the output mode signal MODE of the mode setting circuit (5) becomes the input setting mode. In this input setting mode, the five-digit Japanese segment of the display (2) is utilized, and as shown in FIG. 2B, the characters (INPLIT) are displayed without indicating the input setting mode.

At this time, as shown in Figure 5, this character (rNP[JT) and the 5-digit value (input value) from the value and decimal point position setting circuit (7) are displayed alternately on the 5-digit display. will be displayed. In this case, the display time of the character □ is 0.1~
0.2 seconds, the numerical display time is 1 second to 1.2 seconds, and of the five digits, the digit that can be reset will blink twice at 3 to 4 Hz. . Initially, the previous set value from the memory (9) is displayed as this input numerical value. Therefore, among these 5 digit numbers,
At first, the leftmost digit blinks at 3 to 4 Hz (number "4" in Figure 5). From this state, bring the permanent magnet (7) close to the mark (25M) on the right side, turn on the reed switch (25), that is, the switch (IR) for a long time or a short time, or use both together. Set the leftmost digit blinking at 4Hz to the numerical value "1".

Next, when the switch (IL) is turned on for a short time, the blinking digit in the numerical display for 1.0 to 1.2 seconds shifts to the digit on the right as shown in FIG. Therefore, the switch (IR)
Turn on long or short, or use a combination of both to set the value of this digit to "2". Thereafter, in the same manner, the switch (IL) is briefly turned on to sequentially move the blinking digits to the right, and the numerical value of that digit is set using the switch (IR).

After setting the value up to the digit of -Koseki in this way, when the switch (IL) is turned on for a short time, the decimal point blinks twice as shown in FIG. Then, by turning on the switch (IR) for a short time or for a long time, the decimal point position changes.
r Set the decimal point at 1.2345J.

With the above steps, the input setting mode ends. Therefore, when the switch (IL) is turned on for a long time, the mode setting circuit (5)
The output mode signal MODE becomes the display value setting mode.

When changing this mode, r 1.
The input value of 2345J is stored in the input value storage section (9) of the memory (9).
1 is transferred to I) and written.

When the display value setting mode is entered, 5 on the display section (2)
The Japanese character segments of the digits are utilized to display the display setting mode characters (DISPL) as shown in FIG. 2C. At this time, as shown in Figure 5, this letter (D
ISPL) and a 5-digit numerical value (display value) are displayed alternately with the same time relationship as in the input setting mode, and the digits of the set numerical value blink at 3 to 4 Hz.

In addition, the displayed value is initially stored in the storage section (9D) of the memory (9).
The previous setting display value will be displayed, and the leftmost digit will blink. Thereafter, in the same manner as when setting the input value, (3741, 7) is set as the display value to complete the display value setting.

When this is completed, the switch (IL) is finally turned on for a long time, and the 5-digit display section displays the letters (OP) as shown in FIG. 5, indicating that the frequency measurement mode has been entered. When changing this mode, before changing the mode, r 37
The displayed value of 41.7J is written to the storage section (9D) of the memo January 9). After that, when 2 seconds have passed, this character (O
The display of P) disappears, and as described above, the output display frequency is calculated based on the calculated value of the input value:display value ratio, and the calculated output value is displayed on the 5-digit display section.

As described above, by setting a specific frequency value of the input frequency and the output display frequency value at that input frequency, the ratio between the two is automatically calculated. When measuring the input frequency, an output display value is calculated from the measured input frequency based on this ratio, and is displayed on the display section.

The embodiment shown in FIG. 1 can be substantially easily realized using a microcomputer, and each block is equivalent to a hardware representation of a function executed by this microcomputer.

Note that this example shows the output, but if you want to obtain the output voltage according to the frequency in addition to this display,
The output voltage is obtained from this calculation output.

〔Effect of the invention〕

According to this invention, instead of displaying the input measurement frequency as it is (for example, if you want to convert it into a predetermined unit or display an output display value with a predetermined ratio, it is not necessary to calculate and set the conversion ratio. It is easy to set up because you only need to set the input value and output value.In addition, by setting the input value and output value, the ratio is automatically calculated.
Since the output value is determined from this calculated value, accurate conversion is performed without calculation errors or setting errors, compared to the case where the user determines and inputs the conversion ratio. Moreover, the setting accuracy can also be improved compared to the case where the ratio itself is input.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an example of the device of this invention, and FIGS. 2 to 5 are diagrams for explaining this device. (IL) and (IR) are switches for setting numerical values, (2)
(3) is a display control circuit, (9) is a memory, (
10) is a ratio calculation circuit, and (12) is a display value calculation circuit.

Claims (1)

[Scope of Claims] Means for setting numerical information related to an input frequency value; Means for setting information on an electrical output value or an output display numerical value having a functional relationship with the input frequency value; and the set numerical value. A frequency measuring device comprising: means for calculating an input/output ratio from information; and a frequency measuring device configured to obtain an electrical output or a display output while maintaining the input frequency information and the specified functional relationship based on the calculation result.