JPS63159717A - Recorder - Google Patents

Abstract

PURPOSE:To enlarge and reduce a scale without any manual setting by performing measurement processing in a 1st operation period and storing measurement data in a specific period, finding a maximum and a minimum value in the period and setting gain and a zero point properly according to the amplitude width, and performing recording processing in a 2nd operation period. CONSTITUTION:The measurement data is inputted and stored in the 1st operation period at specific sampling intervals with a clock signal (c) outputted by a timing signal control circuit 12. At this time, the measurement data is A/D- converted 1 and stored in a first-in first-out storage part 2, and they it is compared with the maximum and minimum values by comparators 3 and 5 and stored and updated in maximum and minimum value storage devices 4 and 6. Then, the minimum value is subtracted 7 from the output of the storage part 2 in the 2nd operation section and the result is supplied to a storage part 11; and the minimum value is regarded as a zero point to make a gain adjustment by a gain setter 10 in consideration of the difference between the maximum and minimum values. Thus, the measurement data is recorded automatically within an invariably proper amplitude range.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a recorder, such as a spectroscopic analysis instrument, that records progressive changes in a constant total amount of data (measurement area/total measurement time).

(b) Conventional technology In general, conventional recorders such as pen recorders have a function of varying the gain and zero point in order to change the span when recording continuously changing measurement data. The operator determines how much the gain and zero point should be changed by predicting the change range of the measurement data in advance, setting the data in the measurement range to be recorded within a predetermined range, and determining the desired setting. It is now set to a value.

(C) Problems to be Solved by the Invention Conventional recorders have the function of making the gain and zero point variable, and the operator can predict and set these in advance. This must be done before measurement, and especially if you wish to record enlargement or reduction, the measurement gain and zero point that you have set once will not give you an appropriate scale, and you will have to remeasure and set it again. There are cases,
There was a problem in that it was troublesome to remeasure and reset the settings each time.

In view of the above, it is an object of the present invention to provide a recorder that can automatically set an appropriate range without the operator having to predict and set the gain or zero point in advance.

(d) Measures to solve the problem 1, 4 □ In recent measurements, in addition to the so-called pen-writing recording section of the recorder, a high-speed display means such as a CRT is installed as an auxiliary display device. , which allows real-time monitoring,
Focusing on the point that data recording for storage by a so-called recorder is sufficient if it is obtained at the final stage, the recorder of the present invention sets a period for collecting measurement data and a period for recording the collected measurement data. It is structured separately. That is, the recorder of the present invention has a first operation period for measurement and a second operation period shorter than the first operation period, and performs measurement processing in the first operation period and in the second operation period. A measurement data storage means that executes a recording process and stores all measurement data that is time-sequentially measured at a predetermined sampling period during a first operation period, and a minimum storage means that stores the minimum value of the measurement data. a value storage means, a maximum value storage means for storing a maximum value of the measurement data, and during the second operation period, subtracting the minimum value from the measurement data value derived from the measurement data storage means and outputting the result. a subtracting means for calculating the difference between the maximum value and the minimum value, an amplifying means for amplifying the signal from the subtracting means and adding it to the recording means, and setting the minimum value of the measured data as a zero point. , and gain setting means for controlling the gain of the amplification means according to the difference value.

(E) Function In this recorder, first, in the first operation period, measured data is taken into the measured data storage means in time order at every predetermined sampling period, and the measured data of a certain measurement period is stored in time order. When storing this measurement data, the minimum value and maximum value of the measurement data are also stored, and then, when the measurement data collection is completed, the difference value between the maximum value and the minimum value is calculated. Furthermore, in order to continuously record the measurement data in the recording section, the measured data stored in the measurement data storage means is read out and output to the recording section. At this time, subtract the minimum value from each measurement data, give the subtracted minimum value to the recording unit as measurement data, set the minimum value as the zero point, and set the gain taking into account the magnitude of the difference value. Adjust the gain using the instrument so that the maximum variation range is on the predetermined scale. Therefore, the measurement data recorded in the recording section is always automatically recorded within an appropriate shake range.

(f) Examples The present invention will now be explained in more detail with reference to Examples.

FIG. 1 is a block diagram of a recorder showing an embodiment of the present invention.

The measured signal input to be recorded is converted from an analog signal to a digital signal by the A/D converter 1, and is sequentially stored in the first-in/first-out storage section 2, as well as the comparators 3 and 5 and the minimum value storage 4. and is input to the maximum value storage 6. These A/D converter 1, first-in/first-out storage unit 2, comparator 3.5, minimum value storage 4
The data input to the maximum value storage 6 is sampled and read by a clock signal C (see FIG. 2C) output from the timing signal control circuit 12.

The comparator 3 compares the measurement signal value stored in the minimum value storage 4 with the measurement signal value input this time, and when the measurement signal input this time is smaller, the measurement signal value stored in the minimum value storage 4 is , and the minimum value storage device 4 updates and stores the newly input measurement signal as the minimum value. If the newly input measurement signal is larger, the contents of the minimum value storage 4 are left unchanged. On the other hand, the comparator 5 receives the newly input measurement signal and the maximum value memory 6.
Compare the measured signal stored in , and if the measured signal input this time is larger than the previous maximum
That effect is input into the maximum value storage device 6, and the maximum value storage device 6
Newly input measurement signals are updated and stored. The first-in/first-out storage section 2 is
The measurement signals inputted in time sequence from the A/D converter 1 are
The information is configured to be stored in time sequential manner. In the manner described above, measurement data for a certain period of time is collected and stored.

Next, the output of the first-in/first-out storage unit 2 is input to the subtracter 7 at the recording timing after the measurement is completed, and the other input terminal of the subtracter 7 is stored in the minimum value storage unit 4. The minimum value is inputted, and the value obtained by subtracting the minimum value from the measurement data is converted into an analog signal by a D/A converter, further amplified by the variable gain amplifier 9, and added to the recording section 11 to be printed and recorded. . In addition, in this case, the gain setting device 10
Now, a difference value is obtained from the minimum value of the minimum value storage device 4 and the maximum value of the maximum value storage device 6, and the gain is set according to this difference value, and the variable gain amplifier 9 is automatically set.

In this case, the zero point is determined by the contents of the minimum value storage 4.

Possible gain settings in the gain setter 10 are as follows, where the possible gains are G1<G2 x G3<...<G, l.
5caleG*, +(Smax −Sm1n) > F
Set to mth so that ull 5cale *
The larger the difference value of (Smax-3shin), the smaller the gain is set.

Next, the overall operation of the recorder of the above embodiment will be explained with reference to the timing signal waveform shown in FIG.

The timing signal control circuit 12 in FIG. 1 receives a signal A indicating that measurement is in progress from the system under test, and a clock signal B that defines the operation. As shown in FIG. 2, the signal A is a high level signal during measurement, and becomes a low level signal when the measurement is completed and the recording mode is entered. Furthermore, while the signal A indicating that measurement is in progress is at a high level, the clock signal B is input. The timing signal control circuit 12 outputs a clock signal C corresponding to the clock signal B while the timing signal A is high, and using this clock signal C as a sample timing signal, the A/D converter 1 converts the measurement signal input into a digital signal. It is converted and stored in the first-in/first-out storage unit 2 in time order, and the minimum value storage unit 4
Using comparators 3 and 5 in the maximum value storage 6, if the current measurement signal is the minimum value of the previous measurement values, the contents of the minimum value storage 4 are updated and the maximum value is used. In some cases, the contents of the maximum value storage device 6 are updated, and thereafter, this storage operation and the updating operation of the minimum value and maximum value are continued every time the clock signal C is inputted.

When the measurement operation ends, that is, the measurement data collection for a predetermined period ends, the first-in/first-out storage unit 2 stores all the measurement data during that period, and also stores the minimum and maximum values of the measurement data during this period. are stored in the minimum value storage 4 and maximum value storage 6, respectively.

Next, when the measurement timing signal A falls to low and the operation shifts from measurement to recording, the timing signal control circuit 12 sends successive clock signals to the first-in/first-out storage section 2 for reading measurement data. is added,
First-in every time a pulse of this clock signal is applied.
Measured data is read from the first-out storage section 2. Then, the minimum value added from the minimum value storage 4 is subtracted from this measurement data by a subtracter 7. The measured data, that is, the value obtained by subtracting the minimum value each time, is sent to the D/A converter 8.
The signal is converted into an analog signal, amplified by a variable gain amplifier 9, and recorded by a recording section 11.

As mentioned above, the gain and zero point of the variable gain amplifier 9 are such that the zero point is the minimum value stored in the minimum value storage device 4, and the zero point is the difference value between the minimum value and the maximum value, that is, the amplitude of the measurement data. A gain is determined, and the gain setter 10 sets an appropriate gain based on this zero point and amplitude. Therefore,
Regardless of the measurement data, the recording of data during the measurement period is always varied and controlled so that it is recorded in a desired scale width.

However, the recorder of this embodiment automatically controls the gain and zero point according to the amplitude of the measurement data during the measurement period, and is controlled with the aim of always recording the measurement data within a predetermined range of the recording paper. However, there are cases where a fixed gain and zero point are set as a mode, cases where the gain and zero point are set variable by operation, and cases where the gain and zero point are automatically variable as in the above example. It goes without saying that the recorder may have the following modes.

Furthermore, although the above embodiment shows a case in which the functions are achieved by individual logic circuits, the comparison function, storage of minimum and maximum values, subtraction, and other functions of the circuit may be realized by a microcomputer or the like. Good too.

(g) Effects of the Invention According to the recorder of the present invention, the operating period is a first operating period and a second operating period shorter than the first operating period,
Measurement processing is performed during this first operation period, the measurement data for a certain predetermined period is stored in the measurement data storage means, the minimum value and maximum value during this period are determined, and the gain and zero values are calculated based on the amplitude of the measurement data during that period. Set the points appropriately and
Since the recording process is performed during the operation period of

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a recorder showing an embodiment of the present invention, and FIG. 2 is a diagram showing timing signals for explaining the operation of the recorder. 2: First in/first out memory section, 3/5
: Comparator, 4 = Minimum value storage, 6: Maximum value storage, 7: Subtractor, 9: Variable gain amplifier, 10 gain setter, 11: Recording section.

Claims (1)

[Claims] (1) It has a predetermined first operation period and a second operation period shorter than the first operation period, and performs a measurement process in the first operation period and a recording process in the second operation period. A recorder, comprising: a measurement data storage means for storing all measurement data time-sequentially measured at a predetermined sampling period during a first operation period; and a minimum value storage means for storing a minimum value of the measurement data. , maximum value storage means for storing the maximum value of the measurement data, and subtraction means for subtracting the minimum value from the measurement data value derived from the measurement data storage means and outputting the result during the second operation period. means for calculating the difference value between the maximum value and the minimum value; amplification means for amplifying the signal from the subtraction means and adding it to the recording means; and gain setting means for controlling the gain of the amplification means according to the gain of the amplification means.