JPH05119069A - Digital oscilloscope - Google Patents

Abstract

PURPOSE:To read out necessary waveform data when the data are required by additionally providing an acquisition data buffer, set data buffer, switch, and selector to the oscilloscope. CONSTITUTION:At the time of normal operation, the movable contacts of switches 12 and 13 are connected to fixed contacts (a) side. In an acquisition data buffer 10, a plurality of pieces of waveform data to be stored in a digital memory 3 are stored by successively erasing old waveform data. In a set data buffer 11, in addition, a plurality of pieces of set data to be stored in a data register 6 are always stored by successively erasing old set data. At the time of reading out past waveform data, the movable contacts of the switches 12 and 13 are connected to fixed contacts (b) side. The waveform data stored in the buffer 10 are read out to a signal processing circuit 7 and the set data stored in the buffer 11 are supplied to a sample pulse generator 5 and the processing circuit 7 through a selector 15.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to digital oscilloscopes and, more particularly, to the storage of multiple waveform data.

[0002]

2. Description of the Related Art FIG. 2 is a circuit diagram of a conventional digital oscilloscope. In the figure, reference numeral 1 is an input amplifier to which an analog input signal 20 is input, and its output signal is input to an AD converter 2 and a trigger detection circuit 4.

The output data of the AD converter 2 is stored in the digital memory 3 as waveform data. In addition, these A
The D converter 2 and the digital memory 3 are controlled by the sampling signal output from the sample pulse generator 5. The waveform data stored in the digital memory 3 is read by the signal processing circuit 7, converted into display data based on the setting data set in the setting data register 6 by the input operation / control circuit 9, and then displayed on the display unit 8. Displayed as a waveform.

The trigger signal generated by the trigger detection circuit 4 is input to the sample pulse generator 5. The setting data set in the setting data register 6 is also input to the sample pulse generator 5.

The input operation / control circuit 9 controls the waveform memory display operation and performs settings based on panel operation.
Various setting data for input, trigger, data acquisition, processing, etc. are set in the setting data register 6.

By the way, one of the operation modes of the apparatus configured as described above is a sequential store mode in which the digital memory 3 is divided into a plurality of areas and a plurality of waveform data are continuously stored.

[0007]

When actually using a digital oscilloscope, it is often necessary to use waveform data measured in the past after measurement, and the sequential store mode described above is highly practical.

However, in such a conventional device, when operating in the sequential store mode, the operating conditions for that must be set in advance, and the acquisition stops when the memory area becomes full. Operability is poor.

The present invention has been made in view of the above problems, and an object thereof is to always store a plurality of waveform data in the past from a certain measurement time point, and to store the necessary waveform data when necessary. It is to realize a digital oscilloscope that can read out.

[0010]

SUMMARY OF THE INVENTION An invention for solving such a problem is an AD converter for converting an analog input signal into a digital signal, and a digital data for storing digital data output from the AD converter as waveform data. A memory, an acquisition data buffer for always storing a plurality of waveform data stored in the digital memory, a first selector for reading desired waveform data from the waveform data stored in the acquisition data buffer,
A first switch for selectively outputting the waveform data read from the acquisition data buffer through the digital memory or the first selector; a signal processing circuit for displaying the waveform data output from the switch on a display; A setting data register in which setting data for controlling each unit related to the storage operation of the digital memory is stored in advance, and a setting for always storing a plurality of setting data corresponding to the waveform data stored in the acquisition data buffer. A data buffer, a second selector for reading corresponding setting data from the setting data buffer in association with the first selector, and setting data read from the setting data buffer via these setting data registers or the second selector. Driven in conjunction with the first switch Is characterized in that it comprises that the second switch, the.

[0011]

A plurality of waveform data stored in the digital memory are always stored in the acquisition data buffer, and desired waveform data is read out from the waveform data through the first selector.

On the other hand, a plurality of setting data corresponding to the waveform data stored in the acquisition data buffer are always stored in the setting data buffer, and desired setting data among them is transmitted via the second selector. Read out.

Then, either the digital memory or the output data of the first selector is selected as the waveform data by the first switch, and the setting data is set by the second switch which is driven in conjunction with the first switch. Either the data register or the output data of the second selector is selected. Thus, the selector and the waveform storage display operation are executed according to the setting data according to each time axis supplied to each unit while switching through the switch.

As a result, the user can read the past waveform data within the memory size of the buffer and display it when necessary, simply by switching the switch and designating the desired waveform data.

[0015]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a circuit configuration diagram showing an embodiment of the present invention, and the same blocks as in FIG. 2 are assigned the same numbers. 2 is different from the circuit configuration of FIG. 2 in that an acquisition data buffer 10 and a setting data buffer 1 are included.
1, the first switch 12, the second switch 13, the first selector 14, and the second selector 15 are provided. That is, the acquisition data buffer 10 has a capacity for storing a plurality of waveform data stored in the digital memory 3, and is connected to the digital memory 3. The acquisition data buffer 10
A first selector 14 is connected to the first selector 14 and reads desired waveform data from the waveform data stored in the acquisition data buffer 10.

The setting data buffer 11 has a capacity for always storing a plurality of setting data corresponding to the waveform data stored in the acquisition data buffer 10, and is connected to the setting data register 6. A second selector 15 is connected to the setting data buffer 11, and the corresponding setting data is read from the setting data buffer 11 in synchronization with the first selector 14.

The first switch 12 is a digital memory 3
Alternatively, the waveform data read from the acquisition data buffer 10 is selectively output via the first selector 14, one fixed contact a is connected to the output terminal of the digital memory 3, and the other fixed contact b is connected. First
Is connected to the output terminal of the selector 14 and the movable contact is connected to the signal processing circuit 7.

The second switch 13 sends the setting data read from the setting data buffer 11 via the setting data register 6 or the second selector 15 to the first switch 1
The fixed contact a is connected to the output terminal of the setting data register 6, and the fixed contact b is connected to the second selector 1.
5, the movable contact is connected to the sample pulse generator 5 and the signal processing circuit 7.

In the normal operation, the movable contacts of the switches 12 and 13 are connected to the fixed contact a side, and the waveform memory display operation similar to that of FIG. 2 is performed. That is, the waveform data of the digital memory 3 is read to the signal processing circuit 7, and the setting data stored in the setting data register 6 is input to the sample pulse generator 5 and the signal processing circuit 7.

In such a normal operation state, the waveform data stored in the digital memory 3 is stored in the acquisition data buffer 10 while sequentially erasing old waveform data, and a plurality of waveform data are always stored.
The setting data buffer 11 also stores the setting data stored in the setting data register 6 while sequentially erasing old setting data, and always stores a plurality of setting data.

When reading the past waveform data stored in the acquisition data buffer 10, the switch 1 is used.
The movable contacts 2 and 13 are connected to the fixed contact b side. The first selector 14 selects the waveform data to be read, and the second selector 15 selects the setting data to be read corresponding to the waveform data read by the first selector 14. That is, the waveform data stored in the acquisition data buffer 10 is read out to the signal processing circuit 7 via the first selector 14, and the sample pulse generator 5 and the signal processing circuit 7 are passed via the second selector 15. Setting data stored in the setting data buffer 11 is given.

[0022]

As described above in detail, according to the present invention, the past data can be stored after the measurement without being aware that the data is normally stored like the conventional oscilloscope. When the user wants to see it, the user can switch the switch to specify desired waveform data, thereby realizing a digital oscilloscope capable of reading and displaying past waveform data within the memory size of the buffer.

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram of an embodiment of the present invention.

FIG. 2 is a circuit configuration example diagram of a conventional digital oscilloscope.

[Explanation of symbols]

 1 Input Amplifier 2 AD Converter 3 Digital Memory 4 Trigger Circuit 5 Sample Pulse Generator 6 Setting Data Register 7 Signal Processing Circuit 8 Display 9 Input Operation / Control Circuit 10 Acquisition Data Buffer 11 Setting Data Buffer 12 First Switch 13 Number Two switches 14 First selector 15 Second selector

Claims (1)

[Claims] 1. An AD converter for converting an analog input signal into a digital signal, a digital memory for storing digital data output from the AD converter as waveform data, and a waveform data stored in the digital memory at all times. A plurality of acquisition data buffers, a first selector for reading desired waveform data from the waveform data stored in the acquisition data buffers, and an acquisition data buffer for reading through the digital memory or the first selector. First switch for selectively outputting the waveform data output from the switch, a signal processing circuit for displaying the waveform data output from the switch on a display, and setting data for controlling each unit in relation to the storage operation of the digital memory A setting data register in which is stored in advance, A setting data buffer for always storing a plurality of setting data corresponding to the waveform data stored in the acquisition data buffer; and a second setting data read from the setting data buffer in association with the first selector. A selector; and a second switch that drives the setting data read from the setting data buffer through the setting data register or the second selector in conjunction with the first switch to give each unit. Digital oscilloscope.