WO2008125532A2 - Verfahren und vorrichtung zur messung eines pegels einer zeitlich veränderlichen elektrischen messgrösse - Google Patents
Verfahren und vorrichtung zur messung eines pegels einer zeitlich veränderlichen elektrischen messgrösse Download PDFInfo
- Publication number
- WO2008125532A2 WO2008125532A2 PCT/EP2008/054150 EP2008054150W WO2008125532A2 WO 2008125532 A2 WO2008125532 A2 WO 2008125532A2 EP 2008054150 W EP2008054150 W EP 2008054150W WO 2008125532 A2 WO2008125532 A2 WO 2008125532A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- value
- level
- measured variable
- display
- determined
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/04—Measuring peak values or amplitude or envelope of ac or of pulses
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D7/00—Indicating measured values
- G01D7/005—Indication of measured value by colour change
Definitions
- the invention relates to a method and an apparatus for measuring a level of a time-varying electrical parameter, in particular an electrical voltage, a power or an electric current in the logarithmi- see scale.
- level of an electrical measurement z.
- a power an electrical voltage or an electric current to detect and visualize.
- a logarithmic size which is defined by the logarithmic ratio of the respective electrical variable to an associated reference value, z.
- a reception level for example, a reception power is determined as a function of an output voltage applied to the receiver. In this case, the reception level in a transmission over optical fibers in a range of several decades, z. From -3 dBm to -30 dBm, for different wavelengths, e.g. B.
- a peak value rectifier which determines the peak value of a time-variable electrical measured variable and optionally displays it.
- the peak value rectifier is conventionally formed from a number of operational amplifiers connected in series. The disadvantage here is that the determined peak value is dependent on the considered frequency and the duty cycle. As a result, level detection and level evaluation are very inaccurate and only possible to a limited extent.
- the invention is therefore based on the object of specifying a method and a device for measuring a level of an electrical measured variable, wherein a level value can be determined as accurately and reliably as possible with a simple measurement effort.
- the object is achieved by the features mentioned in claim 1.
- the object is achieved by the features mentioned in the claim 9.
- a measuring signal of the measured variable is differentiated and a momentary amplitude value of the differentiated measuring signal is determined, wherein a level value is obtained by iterative approximation of a comparison value to the instantaneous amplitude value the measured variable is determined.
- the level to be determined z.
- a voltage value are determined very accurately and in a wide range of frequency and duty cycle.
- the instantaneous amplitude value is detected by means of the comparator and compared with a predefinable comparison value.
- the differentiated measuring signal has the form of a measuring pulse and an amplitude value of the differentiated measuring signal is understood here and below to mean a peak value of the measuring pulse.
- each measuring pulse represents an amplitude.
- the differentiation of the measurement signal is therefore particularly advantageous since the switching edges can be detected much more reliably when changing the signal. This ensures that measurement sensitivity and accuracy are increased in comparison to non-differentiating methods, in particular in comparison with methods which record time average values of the measured signal over longer time intervals.
- a reference value or the previous level value of the measured variable is used as comparison value and the comparison value is incremented by a predefinable increment when the instantaneous amplitude value exceeds the predetermined reference value or the previous level value, or the comparison value is maintained if the instantaneous amplitude value falls below the predetermined reference value or the previous level value.
- the increment is constant, since instead of a measured value, its amplitude value and not the pulse length is detected by using a differentiator.
- the comparison value is initialized with initial value zero.
- the comparison value is in the absence of a current measurement of the electrical parameter within a predetermined time to zero.
- the determined level value can be output optically. Also, on the basis of the determined level value, z. B. a voltage level, with a known transmission line, an associated power level can be determined.
- a window comparator formed from two further comparators can be provided, which monitors the determined level value for exceeding or falling below a value range which is limited by two threshold values.
- a first, lower threshold value and a second, upper threshold value are specified. If the determined level value exceeds the upper threshold value and thus the value range, then a corresponding output signal, eg. B. for controlling an optical display, are generated. Likewise, when falling below the lower threshold value and thus the range of values, a further output signal z. B. are generated for driving a further optical display.
- this comprises at least one differentiator for differentiating a measured signal of the measured variable and determining a momentary amplitude value of the differentiated measuring signal and a comparator downstream of the comparator and an amplifier, which act together as an incrementer such that by iterative approximation of a comparison value to the instantaneous amplitude value, a level value of the measured variable can be determined.
- the comparator can be designed as a comparator, which compares the instantaneous amplitude value of the measured variable with the comparison value.
- the incrementer can be followed by an optical display.
- the display can be configured as a single-color LED display or as a multi-color LED display, in particular a two-color LED display.
- the display may be formed as a single-color optical fiber display or as a multi-color optical fiber display, in particular a two-color optical fiber display.
- the incrementer can be followed by a window comparator formed from two comparators, which compares the determined level value with a value range limited by two threshold values.
- the differentiator, the comparator and the amplifier and optionally the window comparator are implemented in analog circuit technology.
- FIG. 1 shows schematically a device for measuring a level of an electrical measured variable for an optical transmission system
- FIG. 3 schematically shows a supplement to the circuit arrangement according to FIG. 2 for evaluating the quality of the determined level
- FIG. 4 shows a voltage-power diagram.
- the 1 shows a measuring device 1 for measuring a level value PW of a time-variable electrical measured variable M (U), in particular an electrical voltage U.
- the electrical measured variable M (U) is hereinafter referred to as M for short.
- a power P or an electric current I can be detected as the electrical measured variable M.
- the measured variable M to be detected and determined is, in particular, an electrical voltage U which, for example, in the case of an optical transmission system 2 with a light guide 3, in particular quartz glass fibers, used as the transmission medium, is a light signal to be coupled into the light guide 3 at a transmitter S as the output voltage S describes that at the other end of the light guide 3 to a receiver E with a reception level, for. B. a receive power level L P , is received and coupled.
- an electrical voltage U which, for example, in the case of an optical transmission system 2 with a light guide 3, in particular quartz glass fibers, used as the transmission medium, is a light signal to be coupled into the light guide 3 at a transmitter S as the output voltage S describes that at the other end of the light guide 3 to a receiver E with a reception level, for. B. a receive power level L P , is received and coupled.
- the measuring device 1 is shown in more detail in FIG. In this case, the output voltage U of the receiver E is fed to a differentiator 5 formed from a capacitor Cl and a resistor Rl as an analog measured variable M.
- Differentiator 5 is connected to an input of a comparator 6.
- an amplitude value AW (n) of the output voltage U is generated, which is the Comparator 6 is supplied as an input signal.
- the comparator 6 is designed as a comparator to which a comparison value VW (n), in the exemplary embodiment a voltage reference or voltage reference value, is supplied as a further input signal.
- the comparator 6 is followed by a level converter 7 formed by a resistor R2, a diode D1, a capacitor C2 and a resistor R3, and an amplifier 8, which act as an incrementer 9 such that by iterative approximation of the comparison value applied to the comparator 6 VW (n) to the current amplitude value AW (n) a level value PW (n) of the measured variable M at the output of the measuring device 1 is determined.
- the comparison value VW (n) is determined on the basis of the previous level value PW (n1) or a predefinable reference value, the initial value of the comparison value VW (n) being equal to zero.
- a diode D2 and a resistance element 10 formed from the resistors R4, R5 and a capacitor chain 11 formed from the capacitors C3 to C5 are connected downstream of the amplifier 8.
- the measuring device 1 is implemented in analog active circuit technology, i. the differentiator 5, the comparator 6 and the amplifier 8 are implemented in analog circuit technology.
- the comparator 6 compares the instantaneous amplitude value AW (n) with the comparison value VW (n). If the amplitude value AW (n) is less than or equal to the comparison value
- the capacitor C2 is further charged by the increment with each subsequent measured value pulse as the instantaneous amplitude value AW (n) increases, the increment being constant. If the comparison value VW (n) is equal to or greater than the subsequent amplitude value AW (n + 1), then no comparator output signal is generated so that the capacitor C2 discharges within a predeterminable time and the level value PW (n) to zero goes until a current measurement signal has an amplitude value AW (n) which is greater than the comparison value VW (n).
- the ascertained voltage value SW (n) is then amplified and converted into the level value PW (n), which optionally can be optically output depending on the design of the measuring device 1.
- the incrementer 9 may be followed by an optical display 12.
- the optical display 12 can be designed as a single-color LED display or as a two-color LED display, wherein the iteratively determined by the incrementer 9 voltage value SW is a measure of the level value PW (n) and the optical display 12 represents the rising or falling value of the level value PW (n), for example, by triggering a number of light-emitting diodes corresponding to the rising or falling value.
- the optical display 12 can also be embodied as a single-color LED display or as a multicolor LED display, wherein the voltage value SW (n) determined iteratively by the incrementer 9 is used as a measure of the level value PW (n) and the optical Display 12 changes brightness or color depending on the level value PW (n).
- the visual display 12 may be implemented as a single-color LED display.
- the visual display 12 lights up when the detected level value PW (n) is in the good range. ever For example, after the measured quantity has been determined, the display 12 can light up if the determined level value PW (n) is above a predetermined value, for. B. a voltage value U of 240 mV is.
- the optical display 12 for example, green light for easy detection of a so-called "good” level value PW (n).
- the optical display 12 For detecting a so-called "bad” or "critical” level value PW (n), the optical display 12, a corresponding other luminous color, for. B. red or orange or yellow.
- the display 12 in this exemplary embodiment is shown as a monochrome
- Light-emitting diode display or a single-color light guide display performed.
- the visual display 12 may be implemented as a multi-color display, e.g. As a two- or three-color LED display, be executed.
- the display 12 lights in dependence on the determined level value PW (n) in different colors.
- the optical indicator 12 lights up red when the level value PW (n) is in the “bad” range, yellow when the level value PW (n) is in the “critical” range, and green when the level value PW (n) is in the "good” range "Area lies.
- formed as a three-color display optical display 12 may advantageously be formed of two different color LEDs 12a and 12b and a light guide 12c, wherein the light emitting diodes 12a and 12b are controlled by a window comparator 13, as shown in more detail in FIG ,
- a voltage divider 14 which consists of three resistors 14a, 14b and 14c, two threshold values S1 and S2 are formed as comparison values of the window comparator 13, which consists of two individual comparators 13a and 13b.
- the iteratively determined reception level value PW (n) is determined by means of the a comparator 13a compared to the upper threshold S2 and by means of the other comparator 13b with the lower threshold Sl. If the determined level value PW (n) is smaller than both threshold values S1 and S2, only the red-glowing light-emitting diode 12a is activated, ie the determined level value
- PW (n) lies in the "critical" range below 120 mV. If the determined level value PW (n) is greater than both threshold values S1 and S2, only the green-emitting light-emitting diode 12b is actuated, i. the determined level value PW (n) lies in the "good” range above 240 mV.
- the light emitted by the two light emitting diodes 12a and 12b is guided by means of the light guide 12c to the device outer wall. In order to achieve sufficient color mixing, the light guide 12c includes diffuse portions.
- the transmission quality of the transmitted signal of the measured quantity M can be determined on the basis of the determined level value PW (n) for the voltage U and a received power level Lp assigned to this voltage level value PW (n).
- the transmission rate used is determined by means of the method described above, the level value PW (n) for the voltage U by iterative approximation.
- the received level value PW (n) can be classified into the following three level ranges:
- the optical display 12 can display, for example, the "good” range by a corresponding number of green light emitting diodes 12b and the “bad” range by a corresponding number of red light emitting diodes 12a, wherein the "critical" range is generated and displayed by color mixing in the light guide 12c is.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP08735884A EP2137495A2 (de) | 2007-04-13 | 2008-04-07 | Verfahren und vorrichtung zur messung eines pegels einer zeitlich veränderlichen elektrischen messgrösse |
US12/450,772 US20100188070A1 (en) | 2007-04-13 | 2008-04-07 | Method and device for measuring a level of an electric measurement variable that can be changed over time |
CN200880019575A CN101680772A (zh) | 2007-04-13 | 2008-04-07 | 用于测量随时间变化的电测量量的电平的方法和装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007017895A DE102007017895A1 (de) | 2007-04-13 | 2007-04-13 | Verfahren und Vorrichtung zur Messung eines Pegels einer zeitlich veränderlichen elektrischen Messgröße |
DE102007017895.8 | 2007-04-13 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2008125532A2 true WO2008125532A2 (de) | 2008-10-23 |
WO2008125532A3 WO2008125532A3 (de) | 2009-04-30 |
Family
ID=39767776
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2008/054150 WO2008125532A2 (de) | 2007-04-13 | 2008-04-07 | Verfahren und vorrichtung zur messung eines pegels einer zeitlich veränderlichen elektrischen messgrösse |
Country Status (5)
Country | Link |
---|---|
US (1) | US20100188070A1 (de) |
EP (1) | EP2137495A2 (de) |
CN (1) | CN101680772A (de) |
DE (1) | DE102007017895A1 (de) |
WO (1) | WO2008125532A2 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102014206812A1 (de) | 2014-04-09 | 2015-10-15 | Klaus-Peter Linzmaier | Optischer Empfänger mit adaptiver Hysterese |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1271856A (en) * | 1968-07-26 | 1972-04-26 | Int Standard Electric Corp | Analog to digital converter |
US5083282A (en) * | 1988-03-31 | 1992-01-21 | Anritsu Corporation | Transition state detecting device and measuring device using the same |
GB2286885A (en) * | 1994-02-17 | 1995-08-30 | Sony Uk Ltd | A display device |
US6107947A (en) * | 1996-11-05 | 2000-08-22 | University College Cork | Parallel sigma delta modulator |
DE10063102A1 (de) * | 1999-12-17 | 2001-08-23 | Infineon Technologies Ag | Anordnung und Messung interner Spannungen in einer integrierten Halbleitervorrichtung |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
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FR2298633A2 (fr) * | 1975-01-22 | 1976-08-20 | Inst Textile De France | Dispositif de d |
US4213085A (en) * | 1978-08-28 | 1980-07-15 | Ramer Daniel J | Phase inversion test device |
DE2938947A1 (de) * | 1979-09-26 | 1981-04-09 | Siemens AG, 1000 Berlin und 8000 München | Schaltungsanordnung fuer einen analogvergleicher |
US4520270A (en) * | 1982-09-30 | 1985-05-28 | Ncr Canada Ltd - Ncr Canada Ltee | Self-adjusting sensor controller |
US4606435A (en) * | 1984-09-10 | 1986-08-19 | General Motors Corporation | Brake lining wear sensor and indicator circuit |
US4642696A (en) * | 1985-07-25 | 1987-02-10 | Rca Corporation | Kinescope driver with kinescope current sensing circuit |
US4994792A (en) * | 1989-12-06 | 1991-02-19 | Ziegler Jr Eldon W | Fluid temperature monitoring system |
US5373400A (en) * | 1993-12-01 | 1994-12-13 | Analog Devices, Inc. | Dynamic threshold updating circuit for a maximum likelihood detector using both positive and negative comparators |
DE69941090D1 (de) * | 1998-09-14 | 2009-08-20 | Datalogic Scanning Inc | Verfahren zur schnellen kantendetektion, beständig gegen hohe intersymbolstörung |
DE10131635B4 (de) * | 2001-06-29 | 2004-09-30 | Infineon Technologies Ag | Vorrichtung und Verfahren zur Kalibrierung der Pulsdauer einer Signalquelle |
US7135881B2 (en) * | 2004-12-21 | 2006-11-14 | Teradyne, Inc. | Method and system for producing signals to test semiconductor devices |
US7154774B2 (en) * | 2005-03-30 | 2006-12-26 | Ovonyx, Inc. | Detecting switching of access elements of phase change memory cells |
US7221303B1 (en) * | 2006-03-24 | 2007-05-22 | Cirrus Logic, Inc. | Delta sigma modulator analog-to-digital converters with multiple threshold comparisons during a delta sigma modulator output cycle |
-
2007
- 2007-04-13 DE DE102007017895A patent/DE102007017895A1/de not_active Withdrawn
-
2008
- 2008-04-07 EP EP08735884A patent/EP2137495A2/de not_active Withdrawn
- 2008-04-07 CN CN200880019575A patent/CN101680772A/zh active Pending
- 2008-04-07 WO PCT/EP2008/054150 patent/WO2008125532A2/de active Application Filing
- 2008-04-07 US US12/450,772 patent/US20100188070A1/en not_active Abandoned
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1271856A (en) * | 1968-07-26 | 1972-04-26 | Int Standard Electric Corp | Analog to digital converter |
US5083282A (en) * | 1988-03-31 | 1992-01-21 | Anritsu Corporation | Transition state detecting device and measuring device using the same |
GB2286885A (en) * | 1994-02-17 | 1995-08-30 | Sony Uk Ltd | A display device |
US6107947A (en) * | 1996-11-05 | 2000-08-22 | University College Cork | Parallel sigma delta modulator |
DE10063102A1 (de) * | 1999-12-17 | 2001-08-23 | Infineon Technologies Ag | Anordnung und Messung interner Spannungen in einer integrierten Halbleitervorrichtung |
Also Published As
Publication number | Publication date |
---|---|
CN101680772A (zh) | 2010-03-24 |
EP2137495A2 (de) | 2009-12-30 |
WO2008125532A3 (de) | 2009-04-30 |
DE102007017895A1 (de) | 2008-10-23 |
US20100188070A1 (en) | 2010-07-29 |
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