GB900625A - Expanded scale electrical measuring system - Google Patents
Expanded scale electrical measuring systemInfo
- Publication number
- GB900625A GB900625A GB3490158A GB3490158A GB900625A GB 900625 A GB900625 A GB 900625A GB 3490158 A GB3490158 A GB 3490158A GB 3490158 A GB3490158 A GB 3490158A GB 900625 A GB900625 A GB 900625A
- Authority
- GB
- United Kingdom
- Prior art keywords
- voltage
- test
- bridge
- temperature
- value
- 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.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/08—Circuits for altering the measuring range
Abstract
900,625. Voltage and current measuring. RAINES, A., GALMAN, H., and DAVIS, R. B., [trading as VOLTRON PRODUCTS]. Oct. 30, 1958 [Dec. 16, 1957], No. 34901/58. Class 37. In a wide range temperature compensated expanded scale A.C. measuring circuit the test voltage is applied to an attenuator (Fig. 1, not shown), which may comprise a complex impedance network adapted to remove unwanted harmonics, having a temperature coefficient such as to compensate for temperature variation errors in the remaining apparatus, to feed a rectifier followed by a filter removing the A.C. component and producing a unidirectional voltage proportional to the average or peak value of the test voltage according to the filter time constant. This voltage is applied over a second attentuator (which may be omitted) to a zero suppression circuit comprising a non- linear bridge or a subtraction network comparing the filtered rectifier output with a stabilized reference voltage to produce an output current r=K(E in -X), where E in is the test voltage, K is a constant, and X is the test voltage value corresponding to zero indication; which deflects an indicating or recording instrument compensated for temperature variation by a series thermistor. In Fig. 2, the test voltage 9 is applied over range switchable attenuating resistance 10 to a diode bridge rectifier; the resistance value being large compared with the forward diode resistance to reduce the effect of temperature variations on the rectifier output, which is smoothed by capacitor 15 to a value proportional to the average of the test input. The second attenuator is omitted and the smoothed voltage is applied to a bridge comprising resistors 16, 17, 18 and Zener diode 19 functioning as a non- linear resistor, whose output represents the required suppressed zero function of the test input due to balance of the bridge for a particular input value and progressive unbalance at other values, and is applied to a D.C. meter 20 in series with a temperature compensating resistor 21.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US70287757A | 1957-12-16 | 1957-12-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB900625A true GB900625A (en) | 1962-07-11 |
Family
ID=24822958
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3490158A Expired GB900625A (en) | 1957-12-16 | 1958-10-30 | Expanded scale electrical measuring system |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB900625A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112688653A (en) * | 2020-12-22 | 2021-04-20 | 成都美数科技有限公司 | Bipolar high-power adjustable attenuator |
-
1958
- 1958-10-30 GB GB3490158A patent/GB900625A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112688653A (en) * | 2020-12-22 | 2021-04-20 | 成都美数科技有限公司 | Bipolar high-power adjustable attenuator |
| CN112688653B (en) * | 2020-12-22 | 2023-03-24 | 成都美数科技有限公司 | Bipolar high-power adjustable attenuator |
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