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Dewetron DEWE-ORION-0824-20 Series, Technical Reference Manual

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Dewetron DEWE-ORION-0824-20 Series Technical Reference Manual Download Page 38

Page 38

DEWE-ORION-0824-20x

Amplifier setup in DEWESoft

3.1.3 Analog to digital conversion

The DEWE-ORION-0824-20x uses 8 delta-sigma A/D converters. If you sample with a data rate of 102.4 

kS/s, the ADC actually samples the input signal with 13.1072 MS/s (multiply the data rate with 128) and 

produces 1-bit samples which are applied to the digital filter. The filter expands the data to 24-bits and rejects 

signal parts greater than 51.2 kHz (Nyquist frequency). It also re-samples the data to the more conventional 

rate of 102.4 kS/s.
A 1-bit quantizer introduces many quantization errors to the signal. The 1-bit, 13.1072 MS/s from the ADC 

carry all information to produce 24-bit samples at 102.4 kS/s. The delta-sigma ADC converts from high speed 

to high resolution by adding much random noise to the signal. In this way the resulting quantization noise is 

restricted to frequencies above 100 kHz. This noise is not correlated with the useful signal and is rejected by 

the digital filter.

3.1.4 Anti-alias filter

ADCs can only represent signals of a limited bandwidth. The maximum frequency you can represent is the 

half of the sampling rate. This maximum frequency is also called Nyquist frequency. The bandwidth between 

0 Hz and the Nyquist frequency is called Nyquist bandwidth. Signals exceeding this frequency range can not 

be converted correctly by the sampler.
For example, the sample rate is 1000 S/s, the Nyquist frequency is 500 Hz. If the input signal is a 375 Hz 

sine wave, the resulting samples represent a 375 Hz sine wave. If a 625 Hz sine wave is sampled, the 

resulting samples represent a 375 Hz sine wave too. This happens because signals exceeds the Nyquist 

frequency (500 Hz). The represented frequency of the sine wave is the absolute value of the difference 

between the input frequency and the closest integer multiple of the sampling rate (in this case 1000 Hz).
Some examples:
Input sine wave 2280 Hz, sampling frequency 1000 Hz: 2280 - 2 * 1000 = 280 Hz
Input sine wave 3890 Hz, sampling frequency 1000 Hz: 4 * 1000 - 3890 = 110 Hz

Summary of Contents for DEWE-ORION-0824-20 Series

Page 1: ...2 0 x www dewetron com T e c h n i c a l r e f e r e n c e m a n u a l A u t o m o t i v e E n e r g y P o w e r A n a l y s i s A e r o s p a c e D e f e n s e T r a n s p o r t a t i o n G e n e r...

Page 2: ...ted by copyright All rights are reserved Reproduction adaptation or translation without prior written permission is prohibited except as allowed under the copyright laws All trademarks and registered...

Page 3: ...ting signals 15 2 3 1 Naming 15 2 3 2 Connectors 16 2 3 2 1 Connector base board 16 2 3 2 2 Adapters for base board 16 2 3 2 3 Connectors for TTL counter expansion 18 2 3 2 4 Signal connection for TTL...

Page 4: ...1 4 Period Time Measurement 46 3 2 1 5 Pulse Width Measurement 46 3 2 1 6 Two Pulse Edge Separation Measurement 47 3 2 1 7 Motion Encoder 48 3 2 1 8 Quadrature Encoder 49 3 2 1 9 A Up B Down Encoder...

Page 5: ...e contact your local distributor first or DEWETRON directly For Asia and Europe please contact For the Americas please contact DEWETRON Ges m b H DEWETRON Inc Parkring 4 10 High Street Suite K A 8074...

Page 6: ...e following general safety precautions must be observed during all phases of operation service and repair of this product Failure to comply with these precautions or with specific warnings elsewhere i...

Page 7: ...o a DEWETRON sales and service office for service and repair to ensure that safety features are maintained Keep away from live circuits Operating personnel must not remove equipment covers or shields...

Page 8: ...improperly handled at it s end of life Please recycle this product in an appropriate way to avoid an unnecessary pollution of the environment and to keep natural resources This symbol indicates that...

Page 9: ...kS s per channel and high accuracy typically 0 002 dB inter channel gain mismatch All this has been arranged on a PCI half size board In addition each channel has an anti aliasing filter which is auto...

Page 10: ...8 204 8 kS s 10 40 8 1 2 8 2 Without using counter inputs Options ORION CB CNT8 connection box for easy sensor connection DEWE CAN CAB 2 2 channel CAN adaptor ORION 0824 CB8 BNC connection box BNC co...

Page 11: ...ence with the instructions in your PC manual When you have finished the hardware installation and boot up your computer the operating system will alert that it found a new hardware Cancel the windows...

Page 12: ...oft installation If the installation software doesn t start when you insert the DEWE System DVD into the computer start it manually by clicking on the ShelExec exe file on the DVD or navigate to HTML...

Page 13: ...al Printing version 1 1 2 March 19 2014 DEWE ORION 0824 20x The install shield wizard will simplify the installing procedure Select the needed options you want to install and enter your information Se...

Page 14: ...sktop For more information about the DEWESoft installation please refer to the DEWESoft Software Users Manual To modify the hardware settings select System Hardware setup in the menu Select DEWETRON D...

Page 15: ...the expansion board code letter E gets a channel prefix name like shown in the example below for a two board system Following block diagram explains the naming Multi board system ORION Base board 0 So...

Page 16: ...T_Trigger EXT_CLK1 EXT_CLK2 15AV AGND AGND LRA_CH7 LRA_CH6 LRA_CH5 LRA_CH4 LRA_CH3 LRA_CH2 LRA_CH1 LRA_CH0 CH7 CH6 CH5 CH4 CH3 CH2 CH1 CH0 AGND Bx_DO 0 Bx_DO 1 Bx_DO 2 Bx_DO 3 Bx_DO 4 Bx_DO 5 Bx_DO 6...

Page 17: ...lated from the input to the ORION board but also isolated between each other 12V only available on instruments N c on DEWE 5x PCI xx expansion systems 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 2...

Page 18: ...Ex_DI 1 Ex_DI 2 Ex_DI 5 Ex_DI 6 Ex_DI 10 Ex_DI 11 Ex_DI 12 Ex_DI 13 Ex_DI 17 Ex_DI 18 Ex_DI 21 Ex_DI 22 Ex_DI 25 Ex_DI 26 Ex_DI 29 Ex_DI 30 Digital Input Ex_DI 0 Ex_DI 3 Ex_DI 4 Ex_DI 7 Ex_DI 8 Ex_DI...

Page 19: ...37 pin female SUB D connector Isolated DB37 pinout for ORION DIO PANEL 3 Ex_DI0 DI15 Ex_DI16 DI31 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37...

Page 20: ...6 Ex_DI 29 Ex_DI 30 Digital Input Ex_DI 0 Ex_DI 3 Ex_DI 4 Ex_DI 7 Ex_DI 8 Ex_DI 9 Ex_DI 14 Ex_DI 15 Ex_DI 16 Ex_DI 19 Ex_DI 20 Ex_DI 23 Ex_DI 24 Ex_DI 27 Ex_DI 28 Ex_DI 31 68 pin Amplimite series AMP...

Page 21: ...7 pin female SUB D connector 37 pin female SUB D connector Isolated DB37 pinout for ORION DIO PANEL 3 optional 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33...

Page 22: ...OX ORION CB CNT8 for easy sensor connection ORION DIO PANEL 2 2 counter inputs wired to LEMO and 32 digital inputs wired to SUB D connectors 2 3 2 7 Connection of CAN interface 1 3 5 7 9 11 13 15 2 4...

Page 23: ...connectors on the DB9 adaptor 5 4 3 2 1 9 8 7 6 Res Res DGND CANx_low 5 V 12 V Res CANx_high DGND DEWE CAN CAB 2 with two 9 pin SUB D connectors Two 9 pin SUB D connectors prepared to be mounted insi...

Page 24: ...the result is not valid even when the difference input voltage is lower than 10 V These voltage ranges will be clipped and introduced as large errors that can be easily identified in the frequency spe...

Page 25: ...so period time pulse width two edge separation frequency and all encoder measurements are sup ported 2 5 1 1 DEWESoft settings In Dewesoft there are three basically functions implemented Event countin...

Page 26: ...ynchro nized to analog samples two counters are needed SOURCE SOURCE PAIR GATE GATE PAIR AUX AUX PAIR Additional Inputs Filter Main Counter Main counter out Sub counter out Sub counter out Main counte...

Page 27: ...NT0 1 Aux Bx_CNT0 1 Additional Inputs Bx_DI 8 to 15 or DO 0 to 7 Filter Main Counter 0 Main Counter 1 Enable Counter out 0 Counter out 1 DI 0 to 15 Decoder Decoder Filter 16 16 8 4 Output register Con...

Page 28: ...put AUX input Source Bx_CNT n Gate Bx_CNT n Aux Bx_CNT n Source from pair counter Gate from pair counter AUX form pair counter Gate Bx_CNT n Source Bx_CNT n Source Bx_CNT n Gate from pair counter Sour...

Page 29: ...Filter Filter Main Counter 2 Main Counter 3 Main Counter out 2 Main Counter out 3 Decoder Decoder Filter Filter Main Counter 4 Main Counter 5 Main Counter out 4 Main Counter out 5 Decoder Decoder Fil...

Page 30: ...Ex_CNT n Additional Inputs Ex_DI 0 to 7 Filter Filter Main Counter n Main counter out n Sub counter out n DI 0 to 31 Decoder Sub Counter n Gate Ex_CNT n Aux Ex_CNT n Ex_DIx In Ex_CNT n 8 32 32 24 AC...

Page 31: ...asurement and needs to be ordered separately Fixed Outputs the entered frequency synchronized to the sample clock oscillator based on a 12 8 MHz divider The output starts and stops with the acquisitio...

Page 32: ...he main application for these CAN ports is acquiring CAN data together with analog data Although the CAN data is asynchronous to the analog data the DEWE ORION 0824 20x series guarantees perfect synch...

Page 33: ...9 1 Internal synchronisation For multiple device operation the DEWE ORION 0824 20x is equipped with an additional synchronization connector A standard 10 pin connector with 1 27 mm flat ribbon cable i...

Page 34: ...tem ME master external is on if at the SYNC IN connector a valid SYNC signal is connected DEWE ORION 0824 DEWE ORION 0824 DEWE ORION 0824 DEWE ORION 0824 DEWE ORION 0824 Collision detect Internal sync...

Page 35: ...CI bus based system By default the DEWE ORION 0824 20x device driver orders the board beginning with the lowest PCI bus No and lowest device number to increasing device No and PCI bus No If the system...

Page 36: ...Page 36 DEWE ORION 0824 20x Notes...

Page 37: ...l Correction table Programmable clock control Synch interface I O connector Hardware temperature drift correction Digital I O control To all ADCs To all ADCs AC DC AC DC AC DC AC DC AC DC AC DC AC DC...

Page 38: ...correlated with the useful signal and is rejected by the digital filter 3 1 4 Anti alias filter ADCs can only represent signals of a limited bandwidth The maximum frequency you can represent is the h...

Page 39: ...1 bit oversampled data is passed to a digital anti aliasing filter This filter has no phase error and an extremely flat frequency response It also has an extremely sharp roll off near the cutoff freq...

Page 40: ...y get to the digital filter and the sampler The frequency response of the analog filter is fixed The filter is optimized to produce high frequency alias rejection and to have a flat in band frequency...

Page 41: ...Hz 100kS sec 400 40 Hz 200kS sec 400 80 Hz The exact value of the sample is read back and displayed in DEWESoft for knowing the exact sample rate The factors Q P and N are integer values and automatic...

Page 42: ...MSB Channel 0 Channel 1 LSB Input range 2 5 V with 0 076 mV resolution 3 1 7 Calibration Your DEWE ORION 0824 20x is shipped with a calibration certificate Typically a recalibration is required every...

Page 43: ...vent Counting In Event Counting the counter counts the number of pulses that occur on counter source At every sample clock the counter value is read without disturbing the counting process Figure 12 s...

Page 44: ...ample Clock the value is read Figure 13 shows an example of Gated Event Counting where the counter counts three events on Counter Source At 1 and 2 the counter value is zero because the gate signal is...

Page 45: ...e The direction of the counting depends on the signal state on Counter Aux If Counter Aux is active high level the counter is increasing the counter value if Counter Aux is inactive low level the coun...

Page 46: ...nt 290 218 290 0 218 290 1090 1600 0 290 218 290 1090 1090 Sample Clock Counter Source Synchronized Value 80 Mhz Counter Value 1 2 3 4 5 6 Figure 15 Period Time Measurement 3 2 1 5 Pulse Width Measure...

Page 47: ...Pulse Edge Separation Measurement The two pulse edge separation measurement is similar to the pulse width measurement except that there are two input signals Counter Start and Counter Stop After a ris...

Page 48: ...roviding the square signals for the counter and have a phase shift of 90 With this phase shift the decoder is able to recognize the rotation direction of the motion encoder The third channel types out...

Page 49: ...for X1 encoding 0 2 3 9 7 6 Sample Clock Input A Synchronized Value Input B Counter Value 1 2 3 4 8 7 6 5 4 1 2 3 7 8 9 Figure 18 Quadrature Encoder X1 Mode For X2 encoding the rising edges and the f...

Page 50: ...3 7 8 9 Figure 20 Quadrature Encoder X4 Mode The third channel Input Z which is also referred as the index channel causes the counter to be reloaded with zero in a specific phase of the quadrature cy...

Page 51: ...upports two inputs A and B A pulse on Input A increments the counter on its rising edges A pulse on Input B decrements the counter on its rising edges At every Sample Clock 1 2 9 the counter value is...

Page 52: ...rement The main counter is running on event counting or encoder mode The sub counter measures the time between The sub counter measures exactly the time of the input event with a resolution of 12 5 ns...

Page 53: ...er which can be set to various gate times If the gate time is set to Off no filter is on the input signal The filter circuit samples the input signal on each rising edge of the internal time base If t...

Page 54: ...t pass depending on the phase of the input signal with respect to the internal time base Properties of all filter settings Filter settings Pulse width to pass Pulse width to be blocked 100 ns 100 ns 7...

Page 55: ...also pulse width or two pulse edge separa tion measurement there may be new information between two samples Also measuring the line frequency of about 50 Hz with a sample rate of 10 kSamples sec means...

Page 56: ...enced Positive input to negative input 1 M each with 60 pF to GND Positive input to GND 7 8 M in parallel with 60 pF Negative input to GND 10 M in parallel with 60 pF Overvoltage protection Positive i...

Page 57: ...ous free dynamic range Range 10 V 2 V 0 5 V 0 1 V 1kS to 51 2 kS s 140 dB 140 dB 138 dB 125 dB 51 2kS to 102 4 kS s 137 dB 133 dB 132 dB 122 dB 102 4kS to 200 kS s 103 dB 103 dB 103 dB 103 dB THD 1kS...

Page 58: ...10 V range 10 averages 16k lines 50 kHz sampling rate Noise dB Full Scale Spectral noise Idle input 10 averages 16k lines 100 kHz sampling rate Noise dB Full Scale Spectral noise Idle input 10 average...

Page 59: ...with 100 kOhm Input low level 0 7 V to 2 V Input high level 3 V to 5 V Input low current 50 A Input high current 10 A Input capacitance 5 pF Overvoltage protection 1 to 6 V Input signal characteristic...

Page 60: ...t protection 36 V ESD protection 12 kV HBM CAN tranceiver SNHVD235 PCI data transfere mode DMA with SW pooling ORION CAN 5 V DSUB max 500 mA per channel self healing fuse 12 V DSUB max 200 mA for both...

Page 61: ...temperature 20 to 70 C Relative humidity 10 to 90 non condensing Maximum altitude 2000 m Pollution degree indoor use only 2 Physical Dimensions not including connectors 17 5 x 10 7 cm 6 9 x 4 2 in An...

Page 62: ...Page 62 DEWE ORION 0824 20x Notes...

Page 63: ...he regulations of the following EC directives 73 23 EEC Directive on the approximation of the laws of the Member States relating to electrical equipment designed for use within certain voltage limits...

Page 64: ...C2 Notes...

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