JPH0118387B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for setting characteristic values of a signal measuring instrument.

[Prior Art] Signal measuring instruments, such as logic analyzers, are used in computers, desktop electronic calculators,
It is suitable for adjusting and maintaining digital equipment such as computer terminals and digital control devices, and has been widely used recently. By the way, when using such a signal measuring device, it is necessary for the operator to set the characteristic value of the signal measuring device consisting of a multi-digit number using a keyboard. By the way, in conventional signal measuring instruments, each digit of the characteristic value is set using a keyboard, so any numerical value corresponding to the number of digits of the characteristic value can be input. Therefore, even if the characteristic value has a certain allowable range, characteristic values outside this range can be freely set.

[Problems to be Solved by the Invention] However, with conventional signal measuring instruments, the value set by the operator may exceed the maximum value of the predetermined characteristic value, or
Alternatively, if it is smaller than the minimum value, the operator is simply warned by appropriate means, so the operator must check the maximum or minimum value in the manual that comes with the signal measuring device, and then set the characteristic value again. This required a complicated operation.

Therefore, an object of the present invention is to provide a characteristic value setting for a signal measuring instrument that can reliably set the characteristic value within the range of the maximum value and minimum value when each digit of the characteristic value consisting of a multi-digit numerical value is set using a keyboard. The purpose is to provide a method.

[Means for Solving the Problems] The present invention is a characteristic value setting method for a signal measuring instrument in which an operator sets each digit of a characteristic value consisting of a multi-digit number using a keyboard. In addition to displaying the input setting value on the display means of the signal measuring device, it also determines whether the input setting value is within the range determined by the maximum and minimum values of the characteristic values of the signal measuring device, and if the setting value is within the range. If the set value exceeds the maximum value or is smaller than the minimum value, set the maximum value or minimum value of the characteristic value as the characteristic value, and set the set maximum value as the characteristic value. The value or minimum value is displayed on the display means.

[Function] According to the present invention, when the input set value is outside the range of characteristic values, the maximum value or minimum value of the range is set as the characteristic value depending on whether the set value is large or small, and this value is also set as the characteristic value. Display the value. Therefore, there is an advantage that there is no need for the operator to memorize the maximum or minimum value of the characteristic values or to keep a manual on hand.

[Example] Hereinafter, an example of the present invention will be described based on the accompanying drawings. FIG. 1 is a block diagram schematically showing a logic analyzer which is an example of a signal measuring device to which the present invention is applied. In FIG. 1, a data probe 10 is an active or passive probe having eight chips to which the input ends of eight channels 0 to 7 are respectively connected. The output of the data probe 10 is applied via an input circuit 12 to a high speed storage device 14 and a word recognizer (logical combination detector, hereinafter abbreviated as WR) 16.
WR 16 receives logic signals from terminal 20 and set signals from bidirectional bus 26. WR1
The output of 6 is applied to a programmable counter 28, and the output of counter 28 is applied to high speed storage 14. As is clear from the drawing, storage device 1
4. Clock generator 18, programmable counter 28, central processing unit (hereinafter abbreviated as CPU) 2
4. The keyboard 22, read-only memory (hereinafter abbreviated as ROM) 32, CPU random access memory (hereinafter random access memory is abbreviated as RAM) 30, and display RAM 34,
Each is connected to a bus 26. Display RAM34
The output is applied to a raster display device 36, which is a display means, via a video display drive circuit 38 and displayed. Clock generator 18 and power supply 40, although not shown in the drawing, are connected to each of the blocks described above.

Next, the operation shown in FIG. 1 will be briefly explained with reference to FIGS. 2 to 5. When the power switch is turned on, a display as shown in FIG. 2 appears on the display surface of the display device 36. In the display area of Figure 2, “PRL
TIMING” indicates that parallel logic input signals are displayed in parallel timing mode, and “<HEX
>” indicates that parameter settings are performed in hexadecimal notation. “SMPL” indicates that the input input logic signal is sampled on the edge of the clock signal, “POST” indicates that the logic signal before the trigger signal is selected, and “POS” indicates positive logic mode. shown respectively. "DATA□H=xx" in the second row of the display screen shown in Figure 2 is set to "xx" by the operator.
, it is shown that the combination of logical input signals (that is, characteristic values) input to the data probe 10 should be set in the WR 16 in hexadecimal (□H means hexadecimal). On the other hand, "DLY□H=0000" indicates that the programmable counter 28 is set to logical delay, and the operator sets a characteristic value in hexadecimal at "0000". "EXT□H=x" on the third row of the display screen indicates a combination of logical signals applied to the terminal 20, and the operator sets the combination at the "x" location. "SMPL=50ns" indicates that the sampling period is 50ns, and the numbers 0 to 7 on the left side of the horizontal lines are channel numbers. Now,
The CPU 24 processes signals from the keyboard 22 according to instructions stored in the ROM 32 and transfers parameter information to the display RAM 34. For display
The information stored in the RAM is periodically recalled, converted into a television video signal by the video display device drive circuit 38, and displayed on the display device 36.

After the power switch is turned on and the display shown in FIG.
□H" is "3F", "EXT□H" is "x" (in the case of Figure 1, there is one external terminal of W16, so it is "0" or "1"), "SMPL" is 5μs, and "DLY □O” (□O is 8
For example, "277777"
(However, the maximum value of the characteristic value of "DLY□O" is "177777".
), the display shown in FIG. 3 will appear. However, as mentioned above, the maximum value of "DLY□O" is "177777", and the operator's setting value is "277777", which exceeds the above maximum value.
According to the procedure according to the present invention stored in the ROM 32, the CPU 24 operates and automatically becomes "177777", resulting in the display shown in FIG.

Next, after connecting the input end of the data probe 10 to the measurement point, press the start button on the keyboard 22, and channels 0 to 7 will be stored in the CPU RAM 30.
The information is stored and the display shown in Fig. 5 is created.
Since this is not directly related to the present invention, the explanation will be omitted.

In addition, in FIGS. 3 and 4, the case where the setting value for "DLY" exceeds the maximum value of the characteristic value was explained, but other characteristic values, ie, "DATA",
The same applies to "EXT". Furthermore, if not only the maximum value but also the minimum value of the characteristic value is a problem, for example, the characteristic value (sampling period) of "SMPL"
When the value is set using the keyboard, it is also possible to automatically set and display the minimum value when the operator sets a value smaller than the minimum value.

Next, the present invention will be explained with reference to the flow chart shown in FIG. Now, assume that the characteristic value set by the operator is Y1Y2Y3Y4Y5, and the maximum value of the predetermined characteristic values is X1X2X3X4X5. As described above, if the operator's set value is less than or equal to the maximum value, the set value becomes the characteristic value as is, and if it exceeds the maximum value, the maximum value is finally set as the characteristic value.

In FIG. 6, Step (1): Read the maximum digit Y1 of the value set by the operator from an appropriate register.

Step (2): Compare Y1 with the largest digit of the maximum value, X1. If Y1<X1, it is clear that the set value is smaller than the maximum value, so go to step (16) to set and display the operator's set value as the characteristic value, and if Y1>X1, go to step (3). go.

Step (3): Check whether Y1 is equal to X1. If Y1=X1, the set value below Y2 may exceed the maximum value, so go to step (4); if Y1≠X1, the set value exceeds the maximum value, so go to step (4). Go to (17) to set and display the maximum value as the characteristic value.

Hereinafter, in steps (4) to (15), each digit of the set value and the maximum value is compared to determine which of the set value and the maximum value is to be taken as the characteristic value. Steps (4) to (15) are repeats of steps (1) to (3) described above, so their explanation will be omitted.

The flowchart in FIG. 6 is related to the case where the number of digits of the set value is the same as the number of digits of the maximum value.
If the numbers of digits are different, it can be easily determined whether the set value exceeds the maximum value by simply comparing the numbers of digits.

In addition, if the operator inputs a value that exceeds the limit value, if the limit value is set and displayed after a warning such as a sound or a flashing display, the operator will be notified that the value has been set outside the allowable range. This is convenient because you can let them know.

[Effects of the Invention] As explained above, according to the present invention, the following effects can be obtained. That is, when an operator sets each digit of a characteristic value consisting of a multi-digit numerical value using a keyboard, there is a possibility that the setting value is set outside the predetermined tolerance range, but according to the present invention, the predetermined characteristic value Even if the setting exceeds the range, the limit value of that range,
That is, the maximum value or minimum value can be automatically set as the characteristic value. At this time, since the maximum value or the minimum value is displayed on the display means, the operator can know the limit value of the allowable range of the characteristic value. Therefore, the operator can, without referring to the manual,
Optimal characteristic values can be set again.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a signal measuring instrument to which the present invention is applied, Figs. 2 to 5 are diagrams each briefly showing the display appearing on the display device of Fig. 1, and Fig. 6 is for explaining the present invention. This is a flowchart. 10...Data probe, 12...Input circuit, 14...High speed storage device, 16...Word recognizer, 18...Clock generator, 22...
Keyboard, 24...Central processing unit, 28...Counter, 30...CPU RAM, 32...ROM,
34...Display RAM, 36...Display means, 38
...Video display drive circuit.

Claims (1)

[Scope of Claims] 1. A characteristic value setting method for a signal measuring instrument in which each digit of a characteristic value consisting of a plurality of digits is set by an operator using a keyboard, wherein the set value input by the operator is used as a signal for the signal measuring device. In addition to displaying it on the display means of the measuring instrument, it is determined whether the input setting value is within the range determined by the maximum and minimum values of the specific values of the signal measuring instrument, and if the setting value is within the above range, , set the above set value as a characteristic value, and if the above set value exceeds the above maximum value or is smaller than the above minimum value, set the above maximum value or the above minimum value of the above characteristic value as the characteristic value, and . A method for setting characteristic values of a signal measuring instrument, characterized in that the set maximum value or the minimum value is displayed on the display means.