JPS6352709B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for preventing incorrect address specification of a storage device in a programmable oscilloscope.

In this specification, a programmable oscilloscope refers to the selection of channels necessary for waveform display on the oscilloscope main body, trigger mode settings,
The settings of each setting section, such as measurement range setting, vertical axis position setting of the reference level of the displayed waveform, vertical sensitivity setting, horizontal axis time value setting, trigger polarity setting, etc., are stored in advance according to the waveform to be observed. , an oscilloscope that reads out stored settings corresponding to observed waveforms, sets each setting section according to the read settings, and displays waveforms.

In addition, the settings for each of the above settings can be made by setting the setting device corresponding to each setting section of the programmable oscilloscope or by setting the knobs of each setting section of the oscilloscope body that constitutes a part of the programmable oscilloscope. Then, the position of the setting device or knob is read and stored in the storage device.

The setting contents corresponding to each setting section are referred to as setting data in this specification. Further, this setting operation is performed for each waveform to be observed, and the result is stored in the storage device. In this specification, all setting data for one waveform to be observed is referred to as a program step. Therefore, a plurality of program steps consisting of a plurality of setting data are stored in the storage device, and normally several dozen program steps are stored.

On the other hand, each program step is handled as one group, and reading and writing from the storage device is handled as a group of stored data constituting each program step. Further, in order to identify each program step, a number is attached to each program step, and reading of the program step from the storage device is performed by designating the number. By specifying this number, a program step is selectively called in accordance with the observed waveform, and each setting section is set according to the selected program step, and waveform observation is performed.

The number is also displayed to indicate the selected program step.

However, when writing or reading program steps to or from the storage device, an address outside the address range of the storage device may be erroneously specified.

The present invention has been made in view of the above, and when a programmable oscilloscope specifies an address outside the address range of the storage device or outside a preset range, a symbol indicating the program step displayed on the panel surface is displayed by blinking. The object of the present invention is to provide a method for preventing erroneous specification of a storage device address of a program oscilloscope, which prevents erroneous specification by holding the address within the previously specified range.

The method of the present invention will be explained below using examples.

The figure is a block diagram of an embodiment to which the method of the present invention is applied.

Reference numeral 1 denotes a latch circuit to which an output A of an address counter specifying an address in the memory device 2 of the programmable oscilloscope is input, and latches it with a latch pulse _Lp . The output of the latch circuit 1 is a drive circuit 4 that drives the display 3, a comparator 5 to which the maximum address value M _A of the storage device 2 is applied as one input, and a comparator 5 to which the minimum address value M _i of the storage device 2 is applied to one input. The comparator 6 is applied as an input and the output is applied to a latch circuit 7 which outputs the signal to the storage device 2 as an addressing signal for the storage device 2. Comparator 5 generates a high potential output when the output of latch circuit 1 exceeds the maximum address value M _A , and comparator 6 generates a high potential output when the output of latch circuit 1 is less than the minimum address value M _i do.

The outputs of comparators 5 and 6 are applied to OR gate 8, and the output of OR gate 8 is applied to AND gate 9. A clock pulse CK which determines the blinking period of the display 3 is applied to the AND gate 9.

The output of OR gate 8 is also applied to AND gate 11 through inverter 10. A latch pulse L _p from a latch circuit 7 is applied to the AND gate 11 .

In this embodiment configured as above, when the output A of the address counter applied to the latch circuit 1 is below the maximum address value M _A of the storage device 2 and above the minimum address value M _i of the storage device 2, Comparators 5 and 6 do not generate high potential outputs, and display 3 displays a symbol, such as a number, corresponding to output A and does not blink. On the other hand, the output of the inverter 10 is at a high potential, and the AND gate 11 opens its gate, and the latch circuit 7 receives the latch pulse L _p to output the output of the latch circuit 1, that is, the output A of the address counter.
, and specify the address of storage device 2.

I have now set the address counter by mistake and its output A exceeds the maximum address value M _A of storage device 2, or
Or, when it is less than the minimum address value, the comparator 5 or 6 generates a high potential output, which is output through the OR gate 8, the AND gate 9 opens and the indicator 3 flashes. In this case, it goes without saying that the display 3 displays a display corresponding to the output A. On the other hand, in this case, the output of the OR gate 8 causes the inverter 10 to output a low potential, the AND gate 11 closes its gate, and no latch pulse is applied to the latch circuit 7, so that the latch circuit 7 outputs the previously latched maximum address value. The output A, which is within the range of M _A or less and greater than the minimum address value M _i , remains latched. Therefore, an incorrectly specified address will not be specified.

In addition, in the above example, the maximum address value M _A and the minimum address value M _i were applied as inputs to one of the comparators 5 and 6, but the maximum address value
Other values may be set instead of M _A , and other values may be set instead of the minimum address value M _i .

As explained above, according to the present invention, in a programmable oscilloscope, when an address outside the address range of the storage device or outside a preset range is specified, a symbol indicating a program step is blinked to prevent incorrect address specification. is displayed and the address is kept at the previously specified address within the range, thereby preventing erroneous specification.

[Brief explanation of drawings]

The figure is a block diagram of an embodiment to which the method of the present invention is applied. 1 and 7...Latch circuit, 2...Storage device, 3...
Display device, 4...drive circuit, 5 and 6...comparator.

Claims (1)

[Claims] 1 A programmable device comprising a storage device for storing program steps and a display device for displaying a selected address of the storage device using numbers or symbols corresponding to the address, and the display on the display device indicates the selected program step. In an oscilloscope, it is detected whether or not the output of the address value setting means to be outputted to the storage device is outside a preset range, and when the output of the address value setting means is outside the preset range, an indication is displayed on the display. A method for preventing erroneous specification of a storage device address in a programmable oscilloscope, characterized in that the address of the storage device is not changed by causing the address value setting means to flash and prohibiting application of the output of the address value setting means to the storage device.