JP2671662B2 - Digital oscilloscope - Google Patents

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, 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. Note that 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 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 storage display operation and makes 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 device 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, waveform data measured in the past after measurement is often necessary, and the above sequential store mode 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]

In a digital oscilloscope that converts an analog signal into a digital signal and acquires it as waveform data in a digital memory and displays it on a display based on the setting data in a setting data register, the waveform data is sequentially Waveform data storage means for selectively outputting the desired waveform data out of the plurality of waveform data stored or sequentially stored or the waveform data from the digital memory, and the waveform data storage means for storing the waveform data storage means. The setting data when a plurality of the waveform data are fetched are sequentially stored, and the setting data related to the desired waveform data among the plurality of setting data or the setting data from the setting data register is selectively selected. And a setting data storage means for outputting to Is shall.

[0011]

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

On the other hand, the setting data buffer always stores a plurality of setting data when the waveform data stored in the acquisition data buffer is fetched, and the desired setting data is the second setting data among the plurality of setting data. It is read out via the selector.

The waveform data selects either the digital memory or the output data of the first selector 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. This makes it possible to easily display past waveform data by reading the waveform data from the acquisition data buffer, changing the setting of the digital oscilloscope based on the setting data corresponding to this waveform data, and displaying it on the display. Become.

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

[0015]

Embodiments of the present invention will be described below 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 differs from the circuit configuration of FIG. 2 in that the acquisition data buffer 10 and the setting data buffer 1 are
The first switch 12, the second switch 13, the first selector 14, and the second selector 15 are provided. These 10, 12, and 14 form a waveform data storage means, and 11, 13, and 15 form a setting data storage means, respectively. 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. A first selector 14 is connected to the acquisition data buffer 10 and reads out 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
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 transfers 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 same waveform storage display operation as in 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 acquisition data buffer 10 stores the waveform data stored in the digital memory 3 while sequentially erasing the old waveform data, and always stores a plurality of waveform data.
The setting data buffer 11 also stores the setting data stored in the setting data register 6 while sequentially erasing the old setting data, and always stores a plurality of setting data.

The switch 1 is used to read the past waveform data stored in the acquisition data buffer 10.
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 through the first selector 14, and the sample pulse generator 5 and the signal processing circuit 7 are passed through 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 viewed after the measurement without using the data recording like the conventional oscilloscope. If desired, the user can switch the switch to specify desired waveform data, thereby realizing a digital oscilloscope that can easily read and display past waveform data within the memory size of the buffer.

[Brief description of the drawings]

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

FIG. 2 is a diagram showing a circuit configuration example 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)

(57) [Claims] 1. A digital oscilloscope which converts an analog signal into a digital signal and takes it as waveform data into a digital memory and displays it on a display based on the setting data in a setting data register. Waveform data storage means for selectively outputting the desired waveform data among the plurality of stored waveform data or the waveform data from the digital memory, and the plurality of waveforms stored in the waveform data storage means A setting for sequentially storing the setting data at the time of capturing data and selectively outputting the setting data related to the desired waveform data among the plurality of setting data or the setting data from the setting data register Digital data storage means White scope.