JPH0564723U - Recording device - Google Patents

Abstract

(57) [Abstract] [Purpose] When a measured input signal crosses a predetermined trigger level, a trigger signal is emitted and recording is performed as necessary. It enables the setting of. [Structure] A trigger level is set with a command value for a DA converter, and an adjusting means for the DA converter is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a recording device for converting an analog voltage-measured signal into a digital value and sequentially recording it, and in particular, a recording having a trigger function used when recording only a required waveform. Regarding the device.

[0002]

[Prior Art]

 A conventional recording device having this kind of trigger function has a comparison means for comparing the analog measured voltage signal to be recorded with the trigger level voltage signal. The control circuit gives a recording execution command to the recording means when the output of the comparison means indicates that the measured voltage signal has been exceeded. By providing such means, it is convenient to obtain only the necessary records.

[0003]

[Problems to be solved by the device]

 By the way, in a conventional device, a variable resistor is often used as a means for generating a trigger level voltage signal. In such a device, the resistance value of the variable resistor is changed to obtain a desired trigger level. However, in such a system, setting the trigger level accurately requires difficult adjustment. The present invention has been made to improve this point, and provides a trigger level setting method with easy adjustment.

[0004]

[Means for Solving the Problems]

 Therefore, in the present invention, in the recording device configured to convert the analog voltage signal to be measured into a digital value and sequentially record the signal, an AD converter for converting the analog voltage signal to be measured into a digital value, Trigger level setting means for setting a trigger level of an analog voltage signal, DA converter for receiving a command value corresponding to the trigger level set by the trigger level setting means, and generating a predetermined trigger level voltage, trigger level of the DA converter Comparing the voltage and the analog voltage signal to be measured, and generating a predetermined trigger signal when the analog voltage signal to be measured crosses the trigger level voltage of the DA converter, the AD converter to be measured. When the first reference voltage and the second reference voltage, which are determined in advance, are supplied instead of the analog voltage signal, respectively. A means for adjusting the AD converter based on two output digital values of the AD converter, the first reference voltage and the second reference voltage in place of the command value given to the DA converter by the trigger level setting means. In place of the measured analog voltage signal and the first and second output voltages which are the respective outputs of the DA converter when the first and second command values corresponding to the reference voltage are given respectively. The first reference voltage and the second reference voltage supplied are compared by the comparing means, respectively, and the first and second output voltages are the same as the first reference voltage and the second reference voltage, respectively. By sequentially changing the command value to be given to the DA converter while monitoring the comparison output of the comparing means, the compensated first and second reference voltages corresponding to the first reference voltage and the second reference voltage are obtained. Seeking 2 command value, means for adjusting the DA converter based on the two command values, the city provided.

[0005]

[Action]

 Since the trigger level is set by the DA converter and the adjusting means for the circuit including the DA converter is provided, the accurate trigger level can be set.

[0006]

【Example】

 1, FIG. 2, FIG. 3 and FIG. 4 show a recording apparatus according to an embodiment of the present invention. FIG. 1 is a block diagram of the entire configuration of this recording apparatus, FIG. 2 is a principle diagram of adjustment of a DA converter and an AD converter, and FIG. 3 is an explanatory diagram showing an operation of a recording pattern creating section shown in FIG. FIG. 4 is a recording example diagram related to the present invention. In the figure, 11 is an operation unit including an LCD display and a key switch (not shown), 12 is an input unit, 121 is an input switcher for sequentially switching a plurality of measured analog voltage signals, and 122 is these switches. AD converter for converting an analog voltage signal into a digital value, 123 a DA converter for generating a trigger level current signal, 124 a current / voltage converter for converting the trigger level current signal into a voltage signal, and 125 a plurality of the above Of the analog voltage signal to be measured and the output of the current-voltage converter 124 as an input to compare and generate a predetermined trigger signal, 13 is a control circuit for controlling each element of the device, and 14 is a scale. Part, 15 is a trigger line creation part, 16 is a recording data creation part, 17 and 18 are logical sum circuits, 19 is a head drive circuit, and 20 is a line head. It is.

First, a method of adjusting the AD converter 122 and the DA converter 123 regarding this apparatus will be described. This adjustment utilizes two reference voltages, a first reference voltage (eg 0 volts) and a second reference voltage (eg full scale voltage FS volts).

First, the operation unit 1 gives a first command value corresponding to the first reference voltage to the DA converter 123 via the control circuit 13. As a result, the DA converter 123 outputs a voltage substantially equal to the first reference voltage to the comparator 125. In this state, the first reference voltage is applied instead of any of the input signals. This first reference voltage is input to the AD converter 122 and the comparator 125. The digital value converted by the AD converter 122 is stored in the memory (not shown) of the control circuit 13. On the other hand, in the comparator 125, the control circuit 13 determines whether or not the first reference voltage and the voltage signal based on the first command value are compared with each other. If these two voltage signals do not match, the control circuit 13 changes the value of the first command value by a unit amount and again makes a comparison determination via the comparator 125. Then, the command value of the DA converter when it matches the first reference voltage is stored in the memory (not shown) in the control circuit 13.

Then, the second command value corresponding to the second reference voltage is given to the DA converter 123 via the operation unit 11. Then, a reference voltage is applied instead of any of the input signals. Therefore, this second reference voltage is input to the AD converter 122 and the comparator 125. The AD converter 122 converts this second reference voltage into a digital value. The converted digital value is stored in a memory (not shown) in the control circuit 13. On the other hand, in the comparator 125, the voltage signal output based on the second command value via the DA converter 123 and the second reference voltage are compared to determine whether or not they match. .. Usually, in a circuit including a DA converter, an accurate output is often not obtained due to variations in elements or the like. Therefore, the command value to the DA converter 123 is sequentially changed until the determinations match. Then, the command value at the time of coincidence is stored in a memory (not shown) in the control circuit 13.

FIG. 2 shows the data acquired in this adjusting operation. The left side of FIG. 2 shows the output of the DA converter 123 on the horizontal axis and its command value on the vertical axis, and the right side of FIG. 2 shows the input voltage to the AD converter 122 on the horizontal axis. The output value is plotted on the vertical axis. Since the AD converter 122 and the DA converter 123 both have linear characteristics, the DA converter 123 (or a circuit including the same) can be compensated from the two command values a and b, and c and d Compensation of the AD converter 122 (or a circuit including the same) can be performed from the two output values of These values of a, b, c and d are always stored in the memory in the control circuit 13, used for output compensation of the AD converter 122, and used for setting the trigger level. With the above, adjustment of the AD converter 122 and the DA converter 123 is completed.

When using the recording apparatus to perform trigger recording, the operator first sets the trigger level. The setting of the trigger level is performed by the operation unit 11. Now, consider the level indicated by E (volt) in the left diagram of FIG. 2 for the setting of the trigger level. The operator uses the operation unit 11 to set the trigger level as E. This set value is calculated in the control circuit 13. Based on the result of this calculation, the control circuit 13 gives the DA converter 123 the command value indicated by F in the left diagram of FIG. In addition, the operator determines whether the trigger signal is generated when the measured analog signal to be recorded crosses upward or downward for this trigger level setting value. specify. This designation is made to the control circuit 13 and determines the recording mode.

The recording apparatus shown in FIG. 1 has a scale creating section 14, a trigger line creating section 15, and a print data creating section 16. The graduation creating section 14 records a graduation pattern on a recording paper as needed, and a plurality of line data groups representing unit patterns for forming a plurality of graduation patterns are stored in a graduation pattern storage ROM (not shown). ing. For example, horizontal scale dots are drawn every 1 mm in the direction parallel to the recording paper transfer direction, vertical scale dots are drawn every 1 mm in the direction perpendicular to the recording paper transfer direction, and every 5 mm with respect to these vertical scale dots. When making a thick line pattern appear, if the recording pitch of the line head is set to 1 mm for simplicity, a unit pattern is formed by a group of 5 line data by making the dot data of the thick line pattern the first line data. be able to. A scale pattern can be recorded on the recording paper by sequentially cyclically reading and recording the five line data groups. Which scale pattern is drawn is selected by the operation unit 11.

The trigger line creation unit 15 has a configuration that automatically operates when the above-mentioned trigger level is set. If necessary, the operator can specify the type (for example, a line type pattern such as a solid line, a dotted line, or a dash-dotted line) for this trigger line. If unspecified, the solid line is selected. Under the control of the control circuit 13, based on this information, the selected line type pattern data is read from the ROM storing the line type pattern data (not shown), and these print data are set at the position corresponding to the set value of the trigger level. Are aligned to create a line data group. Then, these line data groups are sequentially and cyclically output.

When the analog voltage signal to be measured crosses the output voltage of the DA converter 123, the recording data creation unit 16 starts its operation based on the trigger signal output from the comparator 125. Although not shown in the figure, the control circuit 13 is provided with a memory for storing the digital value of the AD converter 12 output for the analog signal under measurement for a certain period of time, and the above-mentioned trigger signal is output. At this time, the recording of the analog signal to be measured is started and continued from a certain time before. In this case, the recording data creation unit 16 creates the recording line data one after another based on the data in the memory under the control of the control circuit 13.

The trigger line data output from the trigger line creation unit 15 and the line data created by the recording data creation unit 16 become one line data in which the trigger line and the recording line are combined by the logical sum circuit 17. .. The line data output from the OR circuit 17 is further combined with the line data of the scale pattern created by the scale creating section 14 in the OR circuit 18. In this way, the scale pattern, the trigger line pattern, and the recording line pattern are combined by the logical sum circuits 17 and 18, respectively, and are sequentially output to the head drive circuit 19. The head drive circuit 19 drives the line head 20 to record each recording pattern on the recording paper when the data of one line is aligned.

FIG. 3 shows an example of line data created by each of the scale creating unit 14, the trigger line creating unit 15, and the recording data creating unit 16. All patterns in FIG. 3 are sequentially created from the right side in the order of first line data, second line data, third line data, .... Data of the same rank in the same line of these data are synthesized by the two OR circuits 17 and 18 shown in FIG. 1, and recording as shown in FIG. 4 can be performed.

[0017]

[Effect of the device]

 As described above, according to the present invention, the AD converter and the DA converter can be simultaneously adjusted with a relatively simple structure, and the trigger level can be set accurately.

[Brief description of drawings]

FIG. 1 is a block diagram of an overall configuration of a recording apparatus according to the present invention.

FIG. 2 is an explanatory diagram showing the adjustment principle of the AD converter and the DA converter shown in FIG.

FIG. 3 is a schematic diagram showing an example of line data created by each recording pattern creation unit shown in FIG. 1.

4 is a recording example of the recording apparatus shown in FIG.

[Explanation of symbols]

 122: AD converter 123: DA converter 125: Comparator 14: Scale creation unit 15: Trigger line creation unit 16: Recording data creation unit 2: Recording paper

Claims (1)

[Scope of utility model registration request] 1. A recording apparatus configured to convert an analog voltage signal to be measured into a digital value and sequentially record the converted analog voltage signal into a digital value.
D converter, trigger level setting means for setting the trigger level of the analog voltage signal to be measured, D for receiving a command value corresponding to the trigger level set by the trigger level setting means and generating a predetermined trigger level voltage
A converter, the trigger level voltage of the DA converter is compared with the analog voltage signal to be measured, and the analog voltage signal to be measured is the DA signal.
Comparing means for generating a predetermined trigger signal when the trigger level voltage of the converter is crossed, first and second reference voltages predetermined for the AD converter in place of the analog voltage signal to be measured. Means for adjusting the AD converter based on the two output digital values of the AD converter when each of the above is supplied, and the first value instead of the command value given to the DA converter by the trigger level setting means. The first and second output voltages which are the respective outputs of the DA converter when the first and second command values corresponding to the reference voltage and the second reference voltage are given, respectively, and the analog to be measured. The first reference voltage and the second reference voltage supplied in place of the voltage signal are respectively compared by the comparison means, and the first reference voltage and the second reference voltage are compared.
And the second output voltage is made to be the same as the first reference voltage and the second reference voltage, respectively, by sequentially changing the command value given to the DA converter while monitoring the comparison output of the comparison means. Means for obtaining compensated first and second command values corresponding to the first reference voltage and the second reference voltage, and adjusting the DA converter based on the two command values. Recording device.