JPS57127814A - A-d converter for electronic balance - Google Patents
A-d converter for electronic balanceInfo
- Publication number
- JPS57127814A JPS57127814A JP1407481A JP1407481A JPS57127814A JP S57127814 A JPS57127814 A JP S57127814A JP 1407481 A JP1407481 A JP 1407481A JP 1407481 A JP1407481 A JP 1407481A JP S57127814 A JPS57127814 A JP S57127814A
- Authority
- JP
- Japan
- Prior art keywords
- operational amplifiers
- converter
- load cell
- input terminals
- adjustable resistor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G23/00—Auxiliary devices for weighing apparatus
- G01G23/18—Indicating devices, e.g. for remote indication; Recording devices; Scales, e.g. graduated
- G01G23/36—Indicating the weight by electrical means, e.g. using photoelectric cells
- G01G23/37—Indicating the weight by electrical means, e.g. using photoelectric cells involving digital counting
- G01G23/3707—Indicating the weight by electrical means, e.g. using photoelectric cells involving digital counting using a microprocessor
Landscapes
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Analogue/Digital Conversion (AREA)
Abstract
PURPOSE:To permit fine adjustment of the amplification degree by a converter wherein an adjustable resistor group capable of being varied in resistance stepwisely or continuously is connected between respective input terminals of first and second operational amplifiers which receive a signal from a load cell at their respective the other input terminals. CONSTITUTION:The weight signal from a load cell is input to first and second operational amplifiers each having a feedback resistor, while an adjustable resistor group comprising a combination of variable and fixed resistors is connected between respective the other input terminals thereof, so that the amplification degree may be adjusted. Then, outputs from both the operational amplifiers are converted into a digital signal via a third operational amplifier and an A-D converter. For example, output from a load cell 31 is fed to operational amplifiers 42 and 43. Both the operational amplifiers can be adjusted in the degree of their amplifications by an adjustable resistor group 52. Further, outputs from both the operational amplifiers are fed to a third operational amplifier 44 and then its output is converted into a digital signal through cooperation of a zero point adjusting circuit 71, reference voltage generating circuit 81, protection circuit 91 and an A-D converting circuit 100.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1407481A JPS57127814A (en) | 1981-02-02 | 1981-02-02 | A-d converter for electronic balance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1407481A JPS57127814A (en) | 1981-02-02 | 1981-02-02 | A-d converter for electronic balance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57127814A true JPS57127814A (en) | 1982-08-09 |
| JPH0233969B2 JPH0233969B2 (en) | 1990-07-31 |
Family
ID=11850953
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1407481A Granted JPS57127814A (en) | 1981-02-02 | 1981-02-02 | A-d converter for electronic balance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57127814A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4843667A (en) * | 1971-09-30 | 1973-06-23 | Reliance Electric Co |
-
1981
- 1981-02-02 JP JP1407481A patent/JPS57127814A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4843667A (en) * | 1971-09-30 | 1973-06-23 | Reliance Electric Co |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0233969B2 (en) | 1990-07-31 |
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