JPH0212615Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to improvements in the structure and display of a tester.
In particular, it relates to improvements in the relationship between the display of the switching range and the position of the measurement terminal.

Conventional testers have 4 or 3 measuring terminals as shown in Figure 1 A or B, and when measuring voltage V, resistance Ω, and current A, 4 terminals in Figure 1 A are used. In the terminal example, this is done as follows.

When measuring voltage or resistance, insert the Tescord plug into the COM terminal and V/Ω terminal as shown in Figure 2A.

When measuring a small current, insert the test cord plug into the COM terminal and mA terminal and measure as shown in Figure 2B. When measuring a current of several amperes, insert the test cord plug into the COM terminal and the 10A terminal, as shown in Figure 2C.

Therefore, to measure voltage using the tester 1 as shown in FIG. 3, for example, (1) Set the selector switch 2 to "VOLT" on the display 3 of the selectable range.

(2) Test cord plug (not shown)
into the COM terminal and V terminal of measurement terminal 4.

You have to perform two operations.

However, when performing the above two operations (1) and (2) to measure a voltage of about 500V, for example, even if the changeover switch 2 is set to the changeover range display "VOLT", the result will be as shown in Figure 4. Measurement terminal 4
When the test cord plug is inserted into the mA terminal, a high voltage of about 500V will be applied to the low voltage.
It will be added to the mA terminal circuit and damage the tester.

This problem arises because two operations have to be performed: the changeover switch and the measurement terminal, and these two are not arranged in any way.
When the measurer measures the voltage, the changeover switch 2 is set to "VOLT", but
The measurement terminal 4 is set to "mA", or the changeover switch 2 is set to "200mA" by mistake, and the measurement terminal 4 is set to "V".

This is because in many cases, one or the other is used incorrectly and one is not aware of the fact. If such an operation error is made, problems such as incorrect measurement values and damage to the tester may occur if overvoltage is applied.

The present invention was devised to solve this problem, and has a structure and display that associates the display of the switching range and the measurement terminal corresponding to the display by the switching position of the selector switch, making it easier to operate. The present invention provides a tester that makes it possible to reduce errors. Embodiments of the present invention will be described below with reference to the drawings.

FIG. 5 is a front view of a tester according to an embodiment of the present invention.

In this tester 1, the switching range display 3
and the measurement terminals 4 corresponding to the display are arranged at symmetrical positions with respect to the central axis of the changeover switch 2. Since the knob 2a is provided directly in the direction of the selector switch 2, the required range is displayed 3.
The measurement terminal 4 corresponding to the display is the knob 2a.
They are visually connected by this.

Therefore, when measuring voltage, set one end of the knob 2a of the changeover switch 2 to "V" on the display 3 of the changeover range.
, the other end of the knob 2a will indicate the "V" of the measurement terminal 4, so it is only necessary to insert the plug of the test cord into the "V" of the measurement terminal 4. Therefore, even if the plug is inserted into another measurement terminal 4, it can be easily noticed.

When measuring resistance, as shown in Figure 6A, set one end of the knob 2a of the changeover switch 2 to "Ω" on the display 3 of the switching range, and set the other end of the knob 2a to "mA/" on the measurement terminal 4. Ω”. To measure current in the same way, see Figure 6B.
As shown in the figure, when one end of the knob 2a of the changeover switch 2 is set to "12A" on the changeover range display 3,
The other end of the knob 2a indicates "12A" of the measurement terminal 4.

As is clear from the above explanation, the present invention relates the switching range and the measurement terminal via the knob of the switch, and when the switch is switched to a predetermined switching range, one end of the knob The position corresponds to the switching range.
Then, the other end of the knob of the changeover switch is located on the corresponding measurement terminal side. Therefore, the relationship between the measurement range and the measurement terminal can be grasped in an integrated manner, reducing operational errors and accurately switching the measurement target. The above effect can be further improved if the switching range display and the corresponding measurement terminal are colored to distinguish them from each other, as shown in Figures 6A and B. can be expected.

[Brief explanation of drawings]

1 and 2 are illustrations of measurement terminals, FIGS. 3 and 4 are illustrations of a conventional tester during measurement, and FIG. 5 is a front view of a tester according to an embodiment of the present invention. , FIG. 6 is an explanatory diagram of the switching range display and measurement terminals of the tester according to the above embodiment. 1... Tester, 2... Changeover switch, 3... Switching range display, 4... Measurement terminal.

Claims (1)

[Scope of utility model registration request] A circular changeover switch that is rotatably supported and has a knob in the diametrical direction, a changeover range indicated on the main body along the outer periphery of the changeover switch, and a knob of the changeover switch corresponding to the changeover range. and measurement terminals provided at corresponding positions.