JPS6227928Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention provides an output level unit conversion device, especially a standard signal generator, based on the output level value of the unit input using the level setting key when converting the output level to another unit. This invention relates to an output level unit converter for a standard signal generator, which converts the output level into a standard signal generator and displays the converted unit on a display together with the converted unit.

The units of output level in conventional standard signal generators are indicated by the unit display characters dBm and dB on the panel surface.
Each indicator light is provided corresponding to μ, V, mV, etc., and the unit is displayed by lighting the indicator light of the unit according to the output level, and when converting units, it is possible to display the unit from the panel surface. Unit conversion was semi-fixed, as it was performed by rotating a unit conversion shaft installed in a recessed position with a screwdriver. As time passed, standard signal generators were used more frequently, and a unit conversion switch was installed on the panel to allow the unit of output level to be freely converted. Since unit conversion is performed on the unit, rounding errors occur each time unit conversion is performed, and the conversion errors accumulate, and when the unit is converted to the original unit again, the value on the display no longer matches the initial setting value. There was a risk that the output level and display would be different.

The purpose of this invention is to solve the above-mentioned drawbacks, and each time the unit specification button for specifying the output level unit is operated and the output level is converted to another unit, the unit input using the level setting key is changed. An object of the present invention is to provide an output level unit conversion device for a standard signal generator, which performs a unit conversion calculation based on the output level value of the standard signal generator and displays the calculated value and the designated unit on a display. Therefore, the output level unit conversion device of the present invention is used in the output level unit conversion device of a standard signal generator in which the output level is arbitrarily set using a level setting key.
A storage device that stores the value of the output level set with the bell setting key, a unit specification button that specifies one of the plurality of units of the output level provided for displaying the output level, and a unit specification button. a sequential signal generating circuit that sequentially generates code data assigned in advance to each of the plurality of units based on the operation of the sequential signal generating circuit; The unit includes an arithmetic circuit that performs a unit conversion operation, and a display that displays the arithmetic value calculated by the arithmetic circuit and the unit corresponding to the code data sent from the sequential signal generating circuit. The device is characterized in that each time a designated button is operated, the output level value stored in the storage device is read out, a unit conversion calculation is performed, and the value is displayed together with the unit. An embodiment of the present invention will be described below based on the drawings.

FIG. 1 shows the configuration of an embodiment of the output level unit conversion device of the present invention, and FIG. 2 shows an explanatory diagram for explaining the unit conversion.

Code 1 is the unit specification button, 2 is the pulse generator,
3 is a sequence signal generation circuit, 4 is a level setting key, 5 is
6 represents a storage device, 6 represents an arithmetic circuit, and 7 represents a display device.

Unit specification button 1 is the unit displayed on display 7.
By turning on/off the unit designation button 1 with a button switch for specifying any unit such as dBm, dBμ, V, mV, etc., the unit on the display 7 can be set, for example, dBm, dBμ, V, mV. It is a switch that changes cyclically, such as.

The pulse generator 2 generates pulses by operating the unit designation button 1, and is composed of, for example, a mono-multivibrator circuit.

The sequential signal generation circuit 3 is displayed on the display 7
This is a circuit that determines the order of dBm, dBμ, V, mV, etc. For example, 2 bits "00" is the unit dBm, "01"
If codes are assigned such as dBμ for unit dBμ, 10 for V, and mV for 11, these code data will be generated in sequence, and the code data in the specified unit specified by unit specification button 1 will be generated. This is an encoder that generates.

The level setting key 4 is an input device for setting the output level output from the standard signal generating device, and for example, a numeric keypad or the like is used.

The storage device 5 stores the output level value input using the level setting key 4, and changes the output level each time the unit designation button 1 is operated, that is, each time a pulse is generated from the pulse generator 2. This is a device in which the value of is read out and transferred to the arithmetic circuit 6.

The arithmetic circuit 6 calculates the following formula (2) based on the output level value transferred from the storage device 5 each time the unit designation button 1 is operated, according to the unit output by the sequential signal generation circuit 3. Perform unit conversion calculations using (5).

In Figure 2, e is the open circuit voltage V, P is the matching voltage W, R is the signal source impedance Ω, and Z is the load impedance Ω, then the matching power P = e ² /4R (W) ... (1) where R When ＝Z, therefore e=√4 (V) ...(2) DBM=10log ₁₀ [(e ² /4R)/10 ^-3 ] ...(3) DBμ=20log ₁₀ [e/1×10 ^-6 ] ...(4) Further, when R = 50Ω, DBμ = 113.0 + DBM ...(5) The display 7 displays the unit corresponding to the code data output from the sequential signal generation circuit 3, and
The calculated value converted into this unit by the calculation circuit 6 is displayed.

The operation of the output level unit converter of the present invention constructed as described above will now be described.

The measurer inputs the value of the output level to be output from the standard signal generator using the level setting key 4. At this time, if the unit displayed on the display 7 is different from the desired unit, operate the unit designation button 1 before inputting the output level value with the level setting key 4 to change it to the desired unit. It goes without saying that you should keep it. When the setting using the level setting key 4 is completed, the standard signal generating device outputs the desired output level, and at the same time, the value of the output level, that is, the setting value of the output level is stored in the storage device 5. Next, when the unit designation button 1 is operated, the pulse generator 2 generates one pulse. This pulse is inputted to the sequential signal generation circuit 3 and also inputted to the storage device 5.
The set value of the output level stored in is read out and transferred to the arithmetic circuit 6. On the other hand, order signal〓〓〓〓
The generating circuit 3 receives the pulse from the pulse generator 2, outputs code data of the unit designation code, and sends this to the display 7 and the arithmetic circuit 6. In the arithmetic circuit 6, a unit conversion operation corresponding to the code data from the sequential signal generation circuit 3 is performed based on the output level setting value transferred from the storage device 5, and the result of the operation is displayed on the display 7. Sent out. As a result, the calculated value of the converted output level and its unit are displayed on the display 7.

Next, when the unit designation button 1 is operated, the calculated value of the output level and its unit are displayed on the display 7 through the process described above. The same applies below.

As explained above, according to the present invention, when calculating unit conversion, the conversion is performed based on the output level setting value stored in the storage device, so no matter how many times the unit conversion is repeated, the same value will be obtained. is obtained. Furthermore, simply by operating the unit specification button, the converted value of the unit and its unit are displayed at the same time.

[Brief explanation of drawings]

FIG. 1 shows the configuration of an embodiment of an output level unit conversion device according to the present invention, and FIG. 2 shows an explanatory diagram for explaining unit conversion. In the figure, 1 represents a unit designation button, 2 a pulse generator, 3 a sequential signal generation circuit, 4 a level setting key, 5 a storage device, 6 an arithmetic circuit, and 7 a display. 〓〓〓〓

Claims (1)

[Scope of utility model registration request] In an output level unit conversion device for a standard signal generator in which the output level is arbitrarily set using a level setting key: a storage device for storing the value of the output level set using the level setting key; and for displaying the output level. a unit designation button that designates one of the plurality of output level units; and a sequence signal that sequentially generates code data assigned in advance to each of the plurality of units based on the operation of the unit designation button. a generating circuit; an arithmetic circuit that performs a unit conversion operation on the output level value read from the storage device to the code data of the sequential signal generating circuit; an arithmetic value calculated by the arithmetic circuit and the order; It is equipped with a display that displays the unit corresponding to the code data sent from the signal generation circuit, and reads out the output level value stored in the storage device each time the unit specification button is operated, and performs unit conversion. An output level unit conversion device for a standard signal generator, characterized in that the calculation is performed and the result is displayed together with the unit.