JPH06152549A - Operating level measuring device - Google Patents

Abstract

PURPOSE:To simplify the operation of a corrected value storage, and to obtain an exact measured value even when a variation is generated among products by providing an automatic corrected value calculating means and a corrected value storage means. CONSTITUTION:For example, an IF(intermediate frequency signal) level monitor circuit of a modulating unit(NOD) 40 is equipped with a level detecting circuit constituted of a detector 30 and a multiplier 32, A/D converter 48, CPU 50, and E<2>PROM 52. The CPU 50 transmits an instruction to set the frequency of an outside oscillator 64 at a prescribed intermediate frequency, gradually changes an output level, and inputs data from the A/D converter 48. The CPU 50 discriminates whether or not the inputted data are matched with a designed value within a prescribed permitted range. Then, when the inputted data are not matched with the designed data, the CPU 50 prepares a conversion table, and writes it in the E<2>PROM 52. When the inputted data are matched with the designed data, the CPU 50 writes a flag to indicate that the correction s not necessary in the E<2>PROM 52.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation level for measuring the operation level of a transmission unit, a reception unit, a modulation unit, a power supply unit and other circuit units in equipment such as communication equipment for maintenance and inspection. Regarding measuring device.

[0002]

2. Description of the Related Art Maintenance of communication equipment including circuit units such as a packaged transmission unit (hereinafter referred to as TX), reception unit (RX), modulation unit (MOD), power supply unit (PS), etc. For inspection, the structure shown in FIG. 5 has been conventionally used.

MOD 10, TX 12, RX 14 and P
Inside the package of S 16 are provided monitor circuits for IF (intermediate frequency signal) level, transmission output level, reception level, and primary and secondary voltages, respectively. The analog voltage output from them is S provided in the communication equipment.
A / D in V INTF (supervisor interface) 18
It is input to the converter 20 and converted into a digital signal,
Input to U 22. A communication IC 24 and an E ² PROM 26 are connected to the CPU 22. In the MOD 10, for example, the monitor circuit includes a detector 30 connected to the output of the IF AMP 28 and an amplifier 32 configured by an OP amplifier, a resistor, a capacitor and the like for amplifying the output.

At the time of maintenance and inspection, MPT (Maintenance Portable Termi) is added to the communication IC 24 of the SV INTF 18
nal) 34 is connected. According to the command input to the MPT 34, the CPU 22 digitally collects the level value at a desired position, corrects it with the correction value stored in the E ² PROM 26, and outputs it to the MPT 34 via the communication IC 24. ,
As a result, the measured value is digitally displayed on the display of the MPT 34.

[0005]

The E ² PROM 26 stores a correction value for correcting the gain and / or linearity of each monitor circuit. In the past, however, several correction values have been stored in a large number of assembled packages. The package was extracted, the characteristics of each package were measured, the correction value was calculated, and the average value thereof was calculated and manually input and stored.

Therefore, there is a problem that the operation is complicated and the error becomes large when the characteristics of the package vary depending on the products. Therefore, an object of the present invention is that the operation for storing the correction value is simple, and
An object of the present invention is to provide an operation level measuring device capable of obtaining an accurate measured value even if there are variations among packaged products.

[0007]

SUMMARY OF THE INVENTION An operation level measuring device of the present invention for solving the above-mentioned problems is provided on a circuit unit, and a level measuring means for measuring an operation level of the circuit unit, and to the level measuring means. An automatic correction value calculation means for automatically calculating a correction value for correcting the measurement value of the level measurement means from the measurement value when the reference signal is input; and a correction value calculated by the automatic correction value calculation means. And a correction value storage means for storing the product corresponding to each individual product of the circuit unit.

[0008]

The automatic correction value calculating means automatically measures the characteristic to calculate the correction value, and the correction value is stored in the correction value storing means, so that the operation is simple. In addition, since the correction value is stored for each individual product of the circuit unit, accurate measurement is possible even when the characteristics of each product vary.

[0009]

1 is a block diagram showing a first embodiment of the present invention. In this embodiment, the modulation unit (MO
D) 40, transmission unit (TX) 42, reception unit (RX) 44, and power supply unit (PS) 46, respectively, an IF level monitor circuit, a transmission output level monitor circuit, a reception level monitor circuit, and primary and secondary The next voltage monitor circuit includes an A / D converter 48, a CPU 50, and an E ² PROM 52 in addition to the respective level detection circuits.

Like the conventional example of FIG. 5, the SV INTF 54 is configured to include a communication IC 60 for connection with the CPU 56 and the MPT 58, but since it is not necessary to store a correction value, E ² PROM 6 instead of PROM 26
2 is provided. Figure 2 shows a circuit unit, eg MOD 4
9 is a flowchart showing a procedure for writing a correction value after 0 is assembled. A procedure for writing a correction value in the first embodiment will be described with reference to FIGS. 1 and 2.

First, the output of the external oscillator 64 is connected to the reference signal input terminal of the circuit unit, and the frequency, level setting input and control input of the external oscillator 64 are connected to the CPU 50 (step 1000). In the case of PS 46, the external voltage generator 66 is connected. When a correction value writing command is input from the MPT 58, it is transmitted to the CPU 50 via the communication IC 60 and the CPU 56 (step 1002). The CPU 50 sends an instruction to set the frequency of the external oscillator 64 to a predetermined intermediate frequency, and inputs data from the A / D converter 48 each time while changing the output level stepwise (step 1004). C
The PU 50 determines whether or not the input data matches the design value within a predetermined allowable range (step 100).
6) If they do not match, a conversion table is created (step 1008) and written in the E ² PROM 52 (step 1010). If it agrees with the design value, a flag indicating that no correction is necessary is written in the E ² PROM 52 (step 1012).

After that, the CPU 50 measures the level according to a command from the MPT 58, and if the flag is not set, reads the correction value, performs the correction calculation, and outputs the correction value. FIG. 3 is a block diagram showing a second embodiment of the present invention. In this embodiment, each circuit unit is provided with a package identification ID setting circuit 70 for identifying a product, in addition to the monitor circuits 30 and 32. The ID setting circuit 70 includes, for example, a dip switch or a rotary switch that can be mounted on a substrate, and a different value is set for each product. E ² PROM included in SV INTF 72
A correction value is stored for each ID for each circuit unit in 74, and when a level reading command is input from the MPT 58, the CPU 56 reads the level value via the A / D converter 76 and reads the ID. Correspondingly, the correction value stored in the E ² PROM 74 is used for correction and output.

FIG. 4 is a flow chart showing the procedure for writing the correction value in the embodiment of FIG. As in the case of FIG. 2, the output of the external oscillator 64 is connected to the reference signal input terminal of the circuit unit (step 1020). The setting input and control input are connected to the CPU 56 of the SV INTF 72, and the CPU 56 controls all operations. When the correction value writing command is input from the MPT 58, the communication IC 60
Then, it is transmitted to the CPU 56 (step 1022).
The CPU 56 first reads the package identification ID from the ID setting circuit 70 of the circuit unit (step 102).
4). Subsequently, the CPU 56 is the CPU 50 described in FIG.
The same control as that performed by the external oscillator 64
Data is automatically acquired from the / D converter 76 (step 1026), and the conversion table or flag is written in the E ² PROM 74 in the same manner as in FIG. 2 (step 1028).
1034). At this time, the conversion table or flag is written in association with the ID read in step 1024.

[0014]

As described above, according to the present invention,
The correction value can be written by a simple operation, and accurate correction can be performed even if there are variations among products.

[Brief description of drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention.

FIG. 2 is a flowchart showing a procedure for writing a correction value in the apparatus of FIG.

FIG. 3 is a block diagram showing a second embodiment of the present invention.

4 is a flowchart showing a procedure for writing a correction value in the apparatus of FIG.

FIG. 5 is a diagram for explaining a conventional correction value writing method.

[Explanation of symbols]

 10, 40 ... Modulation unit (MOD) 12, 42 ... Transmission unit (TX) 14, 44 ... Reception unit (RX) 16, 46 ... Power supply unit (PS) 64 ... External oscillator

Claims (4)

[Claims] 1. A level measuring means (30, 3) provided on a circuit unit for measuring an operation level of the circuit unit.
2) and an automatic correction value calculation means (50; 56) for automatically calculating a correction value for correcting the measurement value of the level measurement means from the measurement value when the reference signal is input to the level measurement means.
And a correction value storage means (52; 74) for storing the correction value calculated by the automatic correction value calculation means in association with each individual product of the circuit unit. apparatus. 2. The operation level measuring device according to claim 1, further comprising a collecting means (54; 72) for collecting the measurement values of the level measuring means in a plurality of circuit units. 3. The operation level measuring device according to claim 1, wherein the correction value storage means (52) is provided on the circuit unit. 4. The circuit unit has an identification code output means (70) for outputting an identification code for identifying a product, and the correction value storage means (74) corresponds to the identification code and the correction value. The operation level measuring device according to claim 1, which stores