JPS5854708Y2 - range switch - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a range changer.

More specifically, the present invention relates to a range changer that controls switching of measurement functions, measurement ranges, and unit display of measured values in, for example, a digital display measuring device.

A digital measuring device with multiple measurement functions and multiple measurement ranges has a function switching mechanism, a range switching mechanism, and a measurement value unit display mechanism.

The functions and ranges of digital measuring devices vary widely depending on the characteristics of the digital measuring device, so function switching mechanisms,
The range switching mechanism and unit display mechanism are configured in a specific form for each measuring device.

Therefore, each of these mechanisms does not have general versatility.

As the functions of measuring devices become more complex and sophisticated, it becomes costly to manufacture specific function switching mechanisms, range switching mechanisms, and unit display mechanisms for each measuring device.

The purpose of the present invention is to provide a simple yet versatile range changer.

The present invention will be explained below with reference to the drawings.

The figure is a conceptual configuration diagram of an embodiment of the present invention.

In the figure, INl, IN2. ,,,,,INn is the signal input terminal under test, C0NV1゜C0Nv2...
C0NVn is a human signal converter.

Each of these converters converts a specific type of signal under measurement into a direct current voltage proportional to the signal to be measured.

MX is a multiplexer that selects a converter according to a command signal to be described later.

PA is a programmable amplifier, multiplexer MX
This amplifies the output of the

The programmable amplifier PA is a variable gain amplifier whose gain is adjusted by a command signal to be described later, and produces a normalized output signal.

A/D is an analog-to-digital converter, DISP is a numerical measurement value display, and DR is a display driver.

The analog-to-digital converter A/D converts the output signal of the programmable amplifier PA into a digital signal and supplies it to the measured value display DISP and other signal utilization devices.

SWo is the measurement function designation switch, SWl...S
Wo is a measurement range designation switch.

Measurement range designation switches SW1...SWn are provided for each measurement function.

DECl is a decoder, and ORn is an OR gate.

Switch SWo...SWo is a rotary switch or a push button switch having multiple contacts.

Each contact of the switches SWo...SWn corresponds to each pit of the digital signal, and the combination of open and closed states of each contact becomes a digital signal representing the measurement function or measurement range.

Since the voltage E is commonly applied to one end of the switch SWo, the switch SW.

A digital electrical signal corresponding to the open/closed state of the contact can be obtained from the

The output signal of switch SWo is decoded by decoder DEC1.

Decoder DEC1 generates an output signal on one of a plurality of output lines in response to an input signal.

The output line of the decoder DEC1 is the OR gate OR1...
...Connected to a predetermined one among ORn.

For example, when decoder DEC1 decodes the current measurement designation signal, an output is generated on the first output line, and switch SW1 is used as a current range designator, then the first output line of decoder DEC1 is connected to OR. be done.

It is assumed that when the decoder DEC1 decodes the voltage measurement designation signal, an output is generated on the second output line, and the switch S
If Wo is a range designator for voltage, the coder DE
The second output line of C1 is connected to OR gate ORo.

Further, when decoder DEC1 decodes the AC power measurement designation signal, an output is generated on the nth output line, and this output line is connected to OR gates OR1 and ORn.

The outputs of the OR gates OR1...OR, are respectively given to one end of the switches SW1...SWo.

Therefore, the switch connected to the OR gate to which the output of the encoder DEC1 is applied generates a digital electrical signal corresponding to the open/closed state of the contact.

ROM is a programmable read-only memory (hereinafter referred to as read-only memory).

This read-only memory ROM has a switch SWo.
...The output of SWo is given as an address signal.

DEC2, 3, 4, s are coders. These coders DEC2, 8, 4, and 5 output 1 bit and 12 bits of the output signal read from the read-only memory ROM.
bit, 13 bit, and 14 bit, respectively.

The 11 bits of the output of the read-only memory ROM include a converter selection command signal, the 12 bits contain a gain designation command signal for the programmable amplifier PA, and the 13 bits contain a gain designation command signal for the programmable amplifier PA.
The bits include a decimal point position designation signal for the measured value display value, and the 14 bits include a unit designation signal for the measured value display value.

Therefore, each decoder DEC2, 3, 4, 5 decodes the applied signal and sends it to the multiplexer M, respectively.
Converter selection command signal for X, gain designation command signal for programmable amplifier PA, measured value display DIS
Decimal point position designation signal for P and measurement value display D
Generates a unit designation signal for the ISP.

In the device configured in this way, the switch SWo・
. . . If the measurement function and range are designated by SWo, the address signal given to the read-only memory ROM from switch SWo . . . SWo is uniquely determined.

Therefore, the address contains a converter selection command signal, a gain designation command signal for the programmable amplifier PA, a decimal point position designation signal for the measured value display value, and a unit designation signal for the measured value display value, which correspond to the specified measurement function and range. can be memorized.

Once all such signals have been stored in the read-only memory ROM for the desired measurement function and range, these signals are read out as specified by the switches SWo...SWo and decoders DEC2...
...3 respectively to multiplexer MX and programmable amplifier PA.

and the measurement value display DISP, and the internal configuration of the measurement device is adapted to the specified measurement function and range.

For example, when measuring DC current in the 100 mA range, the switch SWo specifies the DC current measurement function, and the switch SW1 specifies the 100 mA range.

This causes switch SWo to produce a digital signal representing the direct current measurement.

The decoder DEC1 decodes the output signal of the switch SWo and produces an output signal on the first output line.

The first output line of coder DEC1 is OR gate OR
1, so switch SW1 is connected to 100 m
Produces a digital signal representing the A range.

Since the output signals of the decoder DEC1 are not applied to the other switches, the output signals of the other switches are all zero.

The address is specified by the combination of output signals from each switch at this time.

This address contains a command signal that specifies the selection of the DC current converter CON■1, a command signal that specifies the gain of the programmable amplifier PA corresponding to the 100 mA range, a signal that indicates the decimal point position of the displayed measured value, and the displayed value. Since signals representing units of mA are stored, these signals are read out.

When these signals are decoded by the decoders DEC2...5 and applied to the multiplexer MX, programmable amplifier PA, and measurement value display DISP, the multiplexer MX selects the converter C0NV1, and the programmable amplifier PA selects the converter C0NV1. The gain is for the 100 mA range, the decimal point is displayed at Pt3 on the DISP display, and the unit of the measured value is mA.

This enables direct current measurement in the 100 mA range.

In addition, when measuring AC power, switch SWo
Specify AC power measurement with , specify the current range with switch SW1, and specify the voltage range with switch SWo.

Decoder DEC1 decodes the signal representing the AC power measurement and produces an output signal on the nth output line.

The nth output line is OR game) OR1 and OR. Since the switch SW1. SWo generates a digital output signal corresponding to the open/closed state of each contact.

The output signals of the other switches are zero.

At this time, the address specified by the combination of output signals of each switch includes a converter C0N for AC power measurement.
A command signal specifying the selection of Vn, a command signal specifying the gain of the programmable amplifier corresponding to the combination of current range and voltage range, a signal indicating the decimal point position of the displayed measured value, and a signal indicating the unit of the displayed value are stored. Therefore, these are read out.

Depending on the read result, multiplexer MX selects converter C0NVn, and the gain, decimal point position, and unit display of programmable amplifier PA are adapted to the specified range.

This makes it possible to measure AC power within a predetermined range.

The power measurement range can be precisely specified by combining the current range and voltage range.

In such a device, the hardware configuration for switching the measurement function, switching the range, and switching the unit display of the measured value can be made common regardless of the nature of the measurement device.

Therefore, the device of the present invention becomes a versatile range changer for changing measurement functions, changing ranges, and changing unit display of measured values.

In the range selector of the present invention, the address of the memory device is specified by the function designation switch and the range designation switch corresponding to the function, so the addressing mechanism of the memory device is simplified, and the range designation for the specified function is also possible. Can be done in detail.

In addition, the range changer of the present invention decodes the output signal of the function designation switch and applies it to the common terminal of the corresponding range designation switch. It is designed to be unaffected by incorrect operation of the designated switch.

The above is a case where the range changer of the present invention is applied to a measuring device, but the range changer of the present invention is not limited to measuring devices.
It can also be applied to a signal generator.

As a signal generation device, consider, for example, the measurement device described above in which the flow of the measurement signal is reversed, and each functional block that handles the measurement signal (excluding the multiplexer MX) operates in the opposite way to that in the above case. Then, it can be understood that the device in that case is a device that generates a signal with the specified value, type, and range.

The range changer of the present invention has a greater cost reduction effect than conventional devices, as the functions of such a signal processing device become more complex and sophisticated.

[Brief explanation of the drawing]

The figure shows the conceptual configuration of the embodiment of the present invention. INl...■Nn...Input terminal, C0
Nv1...C0NVo...Signal converter, MX...Multiplexer, PA...
Programmable amplifier, A/D...Analog...
Digital converter, DISP...Measurement value display, SWo...SWn...Multi-contact switch, ROM...Programmable read-only memory DEC1...・・・DEC5・・・・・・
decoder.

Claims (1)

[Scope of utility model registration request] Handles signals flowing between multiple signal converters corresponding to signal types, a converter selector that responds to command signals, and the selected signal converter, and adjusts signal values in response to command signals. A range changer for a signal processing device, which is equipped with an adjustment means, a function designation switch that generates a digital signal specifying the character of the signal when a voltage is applied to a common terminal, and decodes the output signal of the function designation switch. a plurality of range designation switches, which are provided corresponding to each function designated by the function designation switch, and each of which receives a corresponding one of the output signals of the coder to a common terminal, and generates a digital signal each designating a range; , and a selection command signal given to at least the converter selector at an address specified by the combination of the output signal of the function designation switch and the output signal of the plurality of range designation switches, and a selection command signal given to the adjustment means. A range switch that includes a memory that stores command signals.