JPH0769183B2 - Recorder - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recorder, and more particularly to selection of a measurement range.

(Prior art) When measuring and recording the magnitude of a measured value with a recorder, if the measurement range is set to the low sensitivity side relative to the magnitude of the measured value, the magnitude of the measured value will be recorded as small on the chart. If the measurement range is set to the high sensitivity side, the size of the measured value will be recorded in a saturated state on the chart.

Therefore, in general, an operator manually sets the measurement range so as to obtain an appropriate recording result while viewing the recording result, but the operability is poor.

In order to improve such operability, an auto-range mechanism has also been proposed which automatically selects and sets an optimum measurement range according to the magnitude of the measured value.

By the way, by using such an auto-ranging mechanism, the measurement range can be switched to a low sensitivity when the measurement value overranges, so that the size can be recorded in the recordable area of the chart, If the size is completely unknown, its approximate value can be obtained.

(Problems to be solved by the invention) However, if the measurement range is sequentially switched so that the optimum measurement range is always set according to the magnitude of the measurement value, the recording span is changed and the recording result becomes difficult to see. I will end up.

On the other hand, if the measurement range is fixed as an approximate value is determined, an appropriate recording result cannot be obtained depending on the subsequent change in the measured value.

The present invention focuses on such a point, and an object thereof is to provide a recorder capable of performing measurement recording in a state in which an optimum measurement range is selectively set at an arbitrary time point.

(Means for Solving the Problems) The recorder of the present invention compares the measured value with the set measuring range and detects that the measured value input has reached a certain value with respect to the set measuring range. A range search mechanism that automatically sets the optimum measurement range by sequentially switching the measurement range from highest sensitivity to low sensitivity, and a range search execution key operated by the operator to selectively operate this range search mechanism. It has a recording unit that records the magnitude of the measured value in analog according to the set measurement range.When the power is turned on, the measurement recording is performed in the preset initial measurement range, and the search is performed after the range search by the range search mechanism. It is characterized in that measurement recording is performed in the optimum measurement range set by.

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

FIG. 1 is a configuration explanatory view showing an embodiment of the present invention.
In FIG. 1, reference numeral 1 is an arithmetic control unit (CPU) that controls the operation of the entire apparatus. 2 is a read-on memory (RO
M), 3 is a random access memory (RA) that stores various values related to measured values, set values, and arithmetic control processing.
M). Reference numeral 4 is a servo unit that constitutes a recording unit, and is provided with a DC motor 5 and a position detector 6.
Reference numeral 7 is a display, and 8 is a keyboard module. The display 7 and the keyboard module 8 are used as a man-machine interface. The keyboard module 8 is provided with a range search execution key operated by the operator to selectively drive the range search mechanism. An A / D converter module 9 converts the analog input signal 10 into a digital signal. These respective constituent elements are commonly connected via a system bus 11.

The operation of the apparatus thus configured will be described.

When the power is turned on, measurement recording is performed in the initial measurement range preset in the A / D converter module 9 by the CPU 1. When the operator sees the recorded result and determines that the initial measurement range is inappropriate for the magnitude of the measured value, the operator operates the range search execution key provided in the keyboard module 8. As a result, the CPU 1 executes a series of range search operations according to the flowchart shown in FIG.

In FIG. 2, first, the CPU 1 sets the maximum sensitivity range for the A / D converter module 9 and records the measurement (step). In this state, if it is overrange, the sensitivity is reset to a range one step lower and measurement is performed, and the sensitivity is sequentially decreased to a range where the measured value does not overrange and measurement recording is performed (step). If overrange occurs even if the lowest sensitivity range is set, the lowest sensitivity range shall be the optimum measurement range. On the other hand, even in the measurement range where overrange no longer occurs, the range search operation is continued while the range search execution key is operated by the operator, and if overrange is detected, the range is switched to the next low sensitivity range. It will be done. When the operator determines from the recording results that the measurement range during measurement recording is appropriate and releases the operation of the range search execution key, the measurement range at that point is determined as the optimum measurement range (step ).

FIG. 3 is an example of measurement recording, and shows an example in which measurement is performed by operating the range search execution key until a peak of a sine wave system whose value is unknown is detected from the recording result. 3 to correspond to steps 1 to 3 in the flowchart of FIG. 2, respectively.

In the embodiments of FIGS. 2 and 3, an example in which the range search operation is continued for a predetermined time by operating the range search execution key for a predetermined time is shown, but when it is not necessary to continue the range search operation For this, the range search operation may be started by operating the range search execution key 1. FIGS. 4 (a) and 4 (b) are measurement recording examples when the range search operation is not continued in this way, and FIG. 4 (a) shows the range search execution key set to 1 at an arbitrary time point P in the overrange recording state. An example of recording in which overrange recording is canceled by operating the range search operation once by operating the range search operation is shown. (B) shows that the range search execution key is operated once at an arbitrary time point P in the small amplitude recording state. The recording example in which the operation range is set to the optimum measurement range for the small amplitude recording is shown. In other words, if you want to record and record a waveform with an extremely low frequency, a waveform that is overranged due to an abnormality or that is likely to be overranged, or a waveform whose amplitude gradually attenuates at an appropriate measurement range at any time, press the range search execution key The optimum measurement range will be set automatically with a single operation.

Further, in the above embodiment, the example in which the constituent elements are connected via the data bus has been shown, but the constituent elements may be connected via a communication bus, for example.

(Effects of the Invention) As described above, according to the present invention, it is possible to realize a recorder that can perform measurement recording in a state in which an optimum measurement range is selectively set at an arbitrary time point, and the practical effect is great.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a structural explanatory view showing an embodiment of the present invention, FIG. 2 is a flowchart showing a flow of operation of a CPU in the present invention, and FIG. 3 is associated with the operation of FIG. Measurement record example diagram, No. 4
The figure is another example of recording in the present invention. 1 ... Calculation control unit (CPU). 2 ... Read-only memory (ROM), 3 ... Random access memory (RA
M), 4 ... Servo unit, 5 ... DC motor, 6 ...
Position detector, 7 ... Display, 8 ... Keyboard module, 9 ... A / D converter module, 10 ... Analog input signal, 11 ... System bus.

Claims (1)

[Claims] 1. A method for comparing a measured value with a set measuring range,
A range search mechanism that detects when the measured value input reaches a certain value for the set measurement range and automatically sets the optimum measurement range while sequentially switching the measurement range from the highest sensitivity to the low sensitivity direction, It is equipped with a range search execution key that is operated by the operator to selectively operate this range search mechanism, and a recording unit that records the magnitude of the measured value in an analog manner according to the set measurement range. A recorder characterized in that measurement recording is performed in a preset initial measurement range, and after a range search by a range search mechanism, measurement recording is performed in an optimum measurement range set by the search.