JPH0821156B2 - Multi-point measuring device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a multipoint measuring device that records or displays the magnitudes of a plurality of analog input signals in an analog manner, and more specifically should record or display. The present invention relates to selection of an analog input signal.

(Prior Art) (Prior Art) One type of multi-point measuring device is configured to perform digital processing.

FIG. 3 is a structural explanatory view of a main part of such a conventional multipoint measuring device. In FIG. 3, 1 ₁ to 1 _n are input terminals for analog input signals. The analog input signals applied to the input terminals 1 ₁ to 1 _n are selectively applied to the amplifier 3 via the scanner 2. The gain of the amplifier 3 is adjusted according to the measurement range, and the analog input signal is standardized to have a constant magnitude. The analog input signal standardized by the amplifier 3 is added to the A / D converter 4 and converted into a digital signal, and this digital signal is temporarily stored in the measurement value memory 5. Reference numeral 6 is a display for digitally displaying the measurement conditions and measurement values, 7 is a recording unit for recording the magnitude of the measurement values on a recording paper in an analog manner by a dot recording head arranged so as to perform raster scanning, 8 Is a keyboard for setting measurement conditions. Reference numeral 9 is a measurement condition memory that stores the set measurement conditions, and 10 is a read-only memory (ROM) that stores fixed data related to the measurement and programs according to a series of measurement procedures. Reference numeral 11 denotes a calculation control unit (CPU) that performs various calculations related to measurement and controls the operation of each unit of the apparatus, and is connected to each component via a bus 12.

In such a configuration, the measurement operation is performed by the keyboard 8
It is executed according to the measurement conditions set by and the program read from the ROM 10.

By the way, selection of an analog input signal to be recorded in such a conventional device has been performed by operating the keyboard 8 to specify a recording channel.

(Problems to be Solved by the Invention) However, according to such a conventional configuration, the keyboard 8 has to be operated each time the recording channel is changed during measurement, and the operability is poor.

The present invention focuses on such a point, and an object thereof is to provide a multipoint measuring device having excellent operability in which a channel to be recorded or displayed can be easily changed.

(Means for Solving the Problems) The present invention that achieves such an object is a multipoint measuring apparatus that records or displays the magnitudes of a plurality of input signals in an analog manner. At least one group having an arbitrary number of input signals to be defined as a group is defined, and control signal generating means for outputting a control signal unique to each group, and these control signals and the input signals corresponding to the respective control signals. A group data memory in which channel numbers are stored in tabular form as a group unit, and the control signal generating means is used when a specified input signal exceeds a predetermined threshold value, in time series, or from an external contact signal circuit. Control signals are generated based on the respective mode signals of, and the control signals are identified from the group data memory to the control signals. Reading the channel number of the input signal to the group belonging arithmetic control unit for controlling the recording unit or the display unit so as to record or display the size of the corresponding input signal, characterized in that it is constituted by a capital to.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a structural explanatory view showing an embodiment of the present invention.
The same parts as those in FIG. 3 are designated by the same reference numerals. In FIG. 1, 13 is a control signal generator. That is, in the present invention, the analog input signals applied to the input terminals 1 ₁ to 1 _n are divided into a plurality of groups for each input signal to be simultaneously recorded, and the control signal generator 13 has a plurality of groups unique to each group. Output a control signal. Reference numeral 14 denotes a group data memory in which each control signal and the measurement channel number to be recorded according to each control signal are tabulated as a group unit.

As such a control signal generation unit 13, for example, a known alarm signal generation unit configured to output an alarm signal when a designated input signal exceeds a predetermined threshold value can also be used. In this case, the recording operation is kept on standby until the alarm signal is output and only the measurement operation is performed.
Then, when the alarm signal is output, the arithmetic and control unit 11 identifies the alarm signal, reads the channel number belonging to the group to be recorded from the group data memory 14, and records the analog input signal of the corresponding channel. The recording unit 7 is driven and controlled.

Here, by grouping so that the analog input signal related to the alarm signal is recorded, the recording result related to the alarm signal can be automatically obtained.

Further, channels to be recorded are grouped by signal system or device, control signals are generated from the control signal generation unit 13 in time series, and each of these groups is selected in time series for time division recording. You can also

Further, as the control signal generator 13, an external contact signal circuit that an operator can arbitrarily operate from the outside may be used. With such a configuration, a plurality of recording channels can be simultaneously switched by, for example, selectively operating one switch.

FIG. 2 shows an external contact signal detected by using a known thermocouple disconnection detection circuit. The same parts as those in FIG. 1 are designated by the same reference numerals. In FIG. 2, the scanner 2
The input terminal SC ₁ to SC _n of connected external contact C ₁ -C _n corresponding to the group to be recorded, thermocouple T ₁ used in the normal measurement to an input terminal SC _{n + 1} ~SC _{n + m} ~ T _m are connected. The voltage + Vs is applied to the input signal line of the amplifier 3 through the series circuit of the high resistance R _H and the switch SW. Reference numeral 15 is a comparator, one input terminal of which is connected to the input signal line of the amplifier 3, and the other input terminal of which is voltage + Vc (Vs> Vc)
Is added, and the output terminal is connected to the bus 12.

In such a configuration, in detecting the on / off of the external contacts C _{1 to} C _n , the switch SW is turned on to flow a minute current to the scanner 2 as in the detection of the disconnection of the thermocouples T _{1 to} T _m .
The magnitude of the voltage applied to each input terminal of the comparator 15 is detected. That is, when the external contact is closed, the current applied to the scanner 2 flows to the common potential point, so the voltage of the input signal line of the amplifier 3 becomes lower than Vc, but when the external contact is open, Since the current applied to the scanner 2 does not flow to the common potential point, the voltage of the input signal line of the amplifier 3 becomes higher than Vc. Therefore, ON / OFF of the external contacts C _{1 to} C _n can be detected from the polarity of the output signal of the comparator 15. Computation control unit 11 has an external contact C ₁
The ON / OFF states of C _n to C _n are detected, and the recording unit 7 is controlled so that the channels belonging to the group corresponding to the external contacts that are turned ON are recorded in the same manner as described above.

In the above embodiment, the example in which the dot recording head arranged so as to raster scan the magnitude of the analog input signal in group units is used to record on the recording paper in an analog manner by the dot pattern is shown. The display may be performed using a graphic display device such as a display device, or both may be used together if necessary.

Further, the present invention is a measurement system configured to measure a large number of channels by connecting a plurality of remote scanners to a multipoint measuring device main body through a communication line, as shown in, for example, Japanese Patent Laid-Open No. 63-109324. A remarkable effect can be obtained by using it in the system.

(Effect of the Invention) As described above, according to the present invention, recording or display is performed when an input signal exceeds a predetermined threshold value, in time series, or based on each mode signal from an external contact signal circuit. Since it is possible to easily change the channel to be used, the recording result related to the alarm signal can be automatically obtained when the alarm mode is set, and multiple input signals can be set when the time series recording mode is set. Timetable recording becomes possible, and in the case of the external contact mode, the input signal of a certain group can be freely selected.

As a result, it is possible to realize a multipoint measuring device having excellent operability.

[Brief description of drawings]

FIG. 1 is a structural explanatory view showing an embodiment of the present invention, FIG. 2 is a structural explanatory view showing a concrete example of a control signal generating section in FIG. 1, and FIG. FIG. 1 ₁ to 1 _n ...... Analog input signal input terminal, 2 ... Scanner, 3 ... Amplifier, 4 ... A / D converter, 5 ... Measured value memory, 6 ... Display, 7 ... Recording section , 8 ... Keyboard, 9 ... Measurement condition memory, 10 ... Read-only memory, 11 ... Arithmetic control section, 12 ... Bus, 13 ... Control signal generating section, 14 ... Group data memory, 15 ... comparator.

Claims (1)

[Claims] 1. A multi-point measuring device for analogically recording or displaying the magnitudes of a plurality of input signals, wherein at least one group is formed by grouping an arbitrary number of input signals to be simultaneously recorded or displayed for the input signals. And a control signal generating means for outputting a control signal unique to each group, and a group in which these control signals and channel numbers of input signals corresponding to the respective control signals are tabulated and stored as a group unit. The data memory and the control signal generating means generate a control signal when a designated input signal exceeds a predetermined threshold value or in time series, or based on each mode signal from an external contact signal circuit, and these control signals are generated. And reads the channel number of the input signal belonging to the group corresponding to the control signal from the group data memory. , Appropriate operation control unit that controls the recording unit or the display unit so as to record or display the magnitude of the input signal, city that is constituted by multi-point measurement apparatus according to claim.