Minebea DSA-631 Instruction Manual Download Page 37

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Bridge configuration

and circuit

Example

Bridge Box Wiring

Method

Remarks

Bridge Voltage

Output

One gage configuration

∙

Suited for where simple
tension, compression, or

bending force is applied

∙

Suited for where changes in

ambient temperature are
small.

∙

Calculated using the

calibration value as it is.

Bridge Voltage (E)

Output

One gage three wire configuration

∙

Suited for where simple

tension, compression, or
bending force is applied.

∙

Strain gage lead wires are

temperature compensated.

∙

Calculated using the

calibration value as it is.

Output

Bridge voltage (E)

One active gage, one dummy gage

configuration.

∙

Suited for where siple
tension, compression or

bending force is applied.

∙

Temperature compensation

using a dummy gage.

∙

Calculated using the

calibration value as it is.

Output

Bridge voltage (E)

Two active gage configuration

∙

Suited for where simple
tension, compression, or

bending force is applied.

∙

Temperature compensation

∙

Calculated using calibrated
value

1/(1 +

)

∙

or signal value

1/(1 +

)

Output

Bridge voltage (E)

Two active gage configuration

∙

Detects bending strain

∙

Eliminates tension and
compression strain.

∙

Temperature compensation

∙

Calculated using calibration

value

1/2 or siganal value

1/2

Output

Bridge voltage (E)

Opposite arm, two active gage

configuration

∙

Detect tension and

compression strain

∙

Eliminates bending strain

∙

Effects of changes in
temperature are doubled.

∙

Calculated using calibration

value

1/2 or signal value

1/2

Summary of Contents for DSA-631

Page 1: ...Dynamic Strain Amplifier DSA 631 INSTRUCTION MANUAL EN294 1320 E ...

Page 2: ......

Page 3: ...densation on the surface of the product The warranty does not apply for the case where damages or faults caused by use against instructions warnings or cautions This instrument is delivered after a thorough examination at the factory prior to shipment However please examine the product s condition and verify that no obvious shipping damage has occurred after opening the package Also examine the sp...

Page 4: ... This indicates a condition or practice that could result in personal injury or loss of life or may result in light injury or physical damage if this equipment is misused due to neglect of a Warning This indicates a condition or practice that could result in light injury or damage to the equipment or other property if this equipment is misused due to neglect of a Caution In order to avoid electric...

Page 5: ...nctions Confirm that there is no failure in the protective function before using Use in Gaseous Atmosphere Never use this amplifier in a flammable or explosive atmosphere or atmosphere of steam Use in such atmosphere will result in danger to users and the amplifier Disassembling the Frame It is dangerous to remove the frame Do not remove the frame from the amplifier other than 100VAC 200VAC switch...

Page 6: ...re such as inside an automobile Do not use this recorder at the following locations Locations where the temperature and humidity rise due to direct sunlight or heaters The operating environment of the amplifier temperature 10 to 50 C humidity 20 to 85 Wet locations Locations where salt oil or corrosive gases exist Damp or dusty locations Locations subject to strong vibrations 3 Cautions on power s...

Page 7: ... the package after it has reached room temperature to avoid any operational failure due to condensation on the surface of the product Do not use this recorder at the following locations High humidity locations Locations with direct sunlight exposure In the vicinity of high temperature heat source Location with vibrations Locations where salt water oil or corrosive gases exist 4 When using many amp...

Page 8: ...TED WARRANTY 1 Warranty period one year from our shipment 2 Warranty limit We will repair the defects of our product free of charge within the warranty period however this warranty does not apply in the following cases Damage or faults caused by incorrect use Damage or faults caused by fire earthquake traffic accident or other natural disasters Damage or faults caused by a repair or modification t...

Page 9: ...RTS ON FRONT PANEL SEE 2 1 ４ 2 2 HOW TO SET CALIBRATION VALUE CAL ８ 2 3 INDICATION UPON BALANCING ９ 2 4 NAMESAND FUNCTIONS OF PARTS ON REAR PANEL SEE FIG 2 2 10 3 BEFORE MEASURING 12 3 1 CABLE CONNECTIONS 12 3 2 OPERATION BEFORE MEASURING 13 3 3 BRIDGE CHECK FUNCTION 15 3 4 CABLE LENGTH COMPENSATION FUNCTION 17 3 5 HOW TO SWITCH SPECIAL FUNCTION SETTING 19 3 6 CASE 20 4 MEASUREMENT 25 4 1 CAUTIONS...

Page 10: ...N 37 6 1 CURRENT OUTPUT DSA631 P07 4 20MAOUTPUT UNIT 37 6 2 CASE FUNCTIONAND TYPE 37 7 MAINTENANCE 39 7 1 ITEMS TO BE CHECKED 39 7 2 HOW TO REPLACE FUSE 41 7 3 CHANGINGACPOWER SUPPLY VOLTAGE 42 8 SPECIFICATIONS 43 9 REFERENCES 45 9 1 FREQUENCY CHARACTERISTICSAND PHASE PROPERTY 45 9 2 CABLE LIST 46 9 3 OUTLINE DIMENSIONS 48 ...

Page 11: ...low The sensitivity is based on BV 2 V Table 1 1 Specifications of DSA 631 DSA 631 can use the following optional devices and case Description Type Items Remarks Current output DSA631 P07 OUTPUT2 4 20 mAoutput Specified upon ordering Bench top case AS16 104 4CH Bench case CAL BAL KEYLOCK and batch ON OFF for all units are available Possible to synchronize with another case AS16 105 6 CH Bench case...

Page 12: ...m Data Recorder Data recording Digital voltage meter Digital recording Pen Oscillograph Waveform Rec in Low freq range DC 120 Hz Thermal Dot Recorder Waveform Rec in High freq range DC 20kHz DAQ Waveform Rec in high freq range DC 100kHz Data processor DataAnalysis and Processing Phenena Sensor Instrument Recorder Analyzer Load Pressure Displacement Acceleration Torque Bridge box Strain gage Strain...

Page 13: ...may generate noises in the amplifying range these amplifiers have high anti noise characteristics This feature is advantageous in measurement using strain a gage Table 1 3 Recommended Sensors and Feature Type AC StrainAmplifier Isolated DSA 631 Voltage Sensitivity 10 V output at 200 x 10 6 strain Non linearity 0 1 FS Frequency Response DC 2 kHz Noise 2 0 x 10 6 strain p p Maximum Gain Approx 50 00...

Page 14: ...ithin approx 100 mV When the output voltage exceed 10 5 V the LED at the over voltage side blinks Digital monitor Four digit 1 2 This monitor digitally displays the output voltage of OUTPUT2 5 When OUTPUT2 level adjustment volume 18 is turned clockwise 10 000 is indicated in response to an output of 10 V In combination with 18 2 tons can be displayed as 2 000 when the transducer converting 2 tons ...

Page 15: ... is turned on a frequency element of 0 5 Hz or lower including DC is deleted which is the state of the offset voltage cancellation Resistance balance fine tuning R FINE Turning this knob clockwise moves the output to the positive side while turning it counter clockwise moves the output to the negative side Keylock switch KEY LOCK On Off switching for keylock can be made by pressing this knob for o...

Page 16: ...bration value setup knob CAL με 1 με 10 6 strain Indicated value is calculated value based on input The value can be set from 1 με to 9999 με by a step of 1 με Pressing the knob changes the digit for calibration value LED 13 and turning the knob changes values For further information see page 8 How to set calibration value The value the equivalent voltage value based on a gage factor of 2 0 and th...

Page 17: ...00 300 500 Hz or W B Low pass filter LED This LED indicates the cut off frequency for the low pass filter W B wideband signifies OFF for the low pass filter OUTPUT2 level control volume The output voltage for OUTPUT2 5 can be controlled from the rating 10 V to 1 V Control the voltage with the attached screw driver The output value is indicated on the digital monitor 3 As decimal point shifting is ...

Page 18: ...he value is based on the equivalent value for gage factor 2 00 and one gage configuration For strain gage type transducer set and calculate the value based on 1 mV V 2 000 με Calibration value setting For strain input με Calibration value CAL setting range Forth Digit Third Digit Second Digit First Digit 1 to 9999 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 EX T...

Page 19: ...by broken line are omitted executing auto balancing For how to set these functions to ON or OFF refer to paragraph 19 How to Switch Special Function Setting Display bridge check No disconnection or short Checking AB line Checking BC line Checking CD line Checking DA line Disconnection or short Example of Indication When ther are disconnections at AB and DA on the brige Disconnection in AB on bridg...

Page 20: ...t to be a slave allowing this unit to synchronize with the master s bridge power voltage circuit When the amplifier is used in a stand alone basis always synchronous signal is supplied through in case wiring The amplifier unit whose setting is set to be INT is the master therefore other units should be set to EXT For more details see page 20 Synchronization among Unit Please connect OCS to GND of ...

Page 21: ...r voltage supply it is possible to perform keylock auto balancing calibration value application and synchronous signal output Aconnection cable is available separately Amplifier Interface connector from rear side ＣＡＬＣＡＬＢＡＬＯＳＣＧＮＤ KEYLOCK ＧＮＤＤＣＤＣ 7 Protective grounding terminal If 3 pin power cord cannot be used for grounding use this terminal for grounding 8 Power supply connector This is the...

Page 22: ... Connections See Fig 3 2 1 Use the power supply cable for 100 VAC Model 0311 5112 for 110 VAC or higher When this amplifier is used in Japan domestic the voltage that exceed power supply voltageAC125 V cannot be supplied from the limitation of ElectricalAppliances and Material Safety Law 200 VAC or 12 VDC depending on the voltage 2 Connect the output cable appropriate to the recorder to be used 3 ...

Page 23: ...ing and auto balancing are performed If there is a cable disconnection or short the examination results are indicated on the digital monitor 3 respectedly The contents to be indicated are listed on the paragraph 15 16 Following the indicated result paragraph 16 repair the cable or bridge After the repair press BAL again for at least five seconds to check for failures The cable length compensation ...

Page 24: ...00 4 000 500 1 000 １k 1 2 Continuous Variable 4 000 8 000 1 000 2 000 ２k 1 2 5 Continuous Variable 8 000 20 000 2 000 5 000 ５k 1 2 Continuous Variable 20 000 40 000 5 000 10 000 １０k 1 2 Continuous Variable 40 000 80 000 10 000 20 000 ２０K 1 2 5 Continuous Variable 80 000 200 000 20 000 50 000 Table 3 1 Measurement range of DSA 631 Sensitivity fine adjusting knob 9 has automatic range switching func...

Page 25: ...rror contents refer to page 16 After confirming the cause of failure take measures to repair the failure Following repairs press the BAL knob for longer than five seconds for disconnection checking If there is no problem Good is indicated If disconnection or a short is detected there is always an error indication However the failure location may not be found depending on the number of disconnectio...

Page 26: ...cd E da or E Ld E ab E da or E La E bc E da E ab E cd E ab E bc E cd or E Lb E Lc E ab E bc E da or E La E Lb E ab E cd E da or E La E Ld E bc E cd E da or E Lc E Ld OPEn 2 Error indication in the case of short Disconnection on bridge circuit Disconnection on cable Indication Digital Monitor A B B C C D D A A B C D Good S ab S bc S cd S da S ab S bc S bc S cd S cd S da S ab S da S ab S cd S bc S d...

Page 27: ...ched using the dip switch on the bottom face of the amplifier See page 19 for more details Table 3 3 Bridge voltage drop rate 0 5 mm2 Wire 20 C Fig 3 4 Schematic diagram of cable length compensation function Distance between amplifier and bridge box m Bridge Resistance 20 m 50 m 100 m 200 m 60 Ω 2 4 5 6 11 0 19 9 120 Ω 1 2 3 0 5 8 11 0 350 Ω 0 4 1 1 2 1 4 1 500 Ω 0 3 0 7 1 5 2 9 1 000 Ω 0 1 0 4 0 ...

Page 28: ... box is required to be composed of the Wheatstone bridge circuit There is a model that has inserted the resistor for the output conditioning of the transducer internally In applying such a transducer the excitation to the transducer rises more than usually Up to 130 or less to consider that the resistance is caused by the cable length and to compensate the voltage drop Therefore as a rule please t...

Page 29: ...p Off Cable length compensation function ON Switch 1 down On 1 2 3 4 ON Bridge check function Switch 2 changeover Bridge check function OFF Switch 2 up Off Bridge check function ON Switch 2 down On 1 2 3 4 ON Decimal point indication Setup through the combinations of switches 3 and 4 Displaying the decimal point of digital monitor 3 at the third place 100 00 1 2 3 4 ON Decimal point indication Set...

Page 30: ...1 5 V will occur For use under such conditions the power supply should be provided with the voltage drop taken into account or the wire diameter or cord length of the power cord should be modified 2 Synchronization between units When two or more amplifier units are installed in a case unit synchronization is maintained by theinternal wiring inside the case and synchronization signal One amplifier ...

Page 31: ... switch 2 and the other cases should be set to EXT Note that only amplifier units with the same bridge power frequency can be installed in a case It is impossible to share a common case or synchronize between cases that have amplifiers installed with different bridge power frequencies Take notice that the bridge power frequency of Dsa 631 is 5 kHz Do not set two or more units to INT Otherwise corr...

Page 32: ...ach amplifier unit regardless of the position of the switch This function is avalible for all amplifier units installed in two or more cases which are connected to each other with a synchrozation cable To apply a calibration value to only one unit use the calibration value application switch 14 in each unit Before doing so confirm that the switch for applying the calibration value to all units is ...

Page 33: ...ch should include a locking mechanism in order to avoid erroneous operations Use a momentary switch accordingly Fig 3 10 Schematic diagram of Remote ＣＡＬＣＡＬＢＡＬＯＳＣＧＮＤ KEYLOCK ＧＮＤＮＣＮＣ Case Interface Connector PinAlignment Remote Box BAL AUTO CAL GND CAL CAL Table 3 6 Interface Connector at Rear Face of Case ...

Page 34: ...t are harsh environmental conditions Power supply 110 VAC 10 Output voltage and current 10 V 10 mA Ambient temperature 50 C 1 3 1 3 6 2 6 9 3 Table 3 8 Relation between number of rack mounting case and one of cooling fan Fig 3 12 Disposition of fan If fan unit Amay prevent upward air flows when the depth differs as shown with a slant fan unitA should be mounted directly above this position Through...

Page 35: ... 50 C and the ambient humidity ranges from 20 to 85 RH with no condensing Prevents instability in operation Install the amplifier system n envitonments where accel eration of mechanical vibratins is less than 3G 3 000 rpm 0 6 mmp p Prevents damage and noise from entering the equipment Install the amplifier system in the presence of strong magnetic or electric fields must be avoided Prevents noise ...

Page 36: ...e measuring 4 2 Input connection 4 2 1 Examples of Strain Gage Bridge Configurations When incorporating one or more strain gages into the four arms of a bridge a quarter half or full bridge configuration can be used These configurations can further be classified into same sign equivalent values and different sign constant proportional values according to the type of strain applied to the strain ga...

Page 37: ...re siple tension compression or bending force is applied Temperature compensation using a dummy gage Calculated using the calibration value as it is Output Bridge voltage E Two active gage configuration Suited for where simple tension compression or bending force is applied Temperature compensation Calculated using calibrated value x 1 1 ν or signal value x 1 1 ν Output Bridge voltage E Two active...

Page 38: ...etects tension and compression strain Eliminates bending strain Temperature conpensation Calculated using calibrated value x 1 2 1 ν or signal value 1 2 1 ν Output Bridge voltage E Four active gage configuration Deteccts bending strain Eliminates tension and compression strain Temperature compensation Calculated using calibration value x 1 4 or signal value x 1 4 Output Bridge voltage E Four activ...

Page 39: ...he bridge voltage will drop due to the conductor resistance of the cable as shown in Table 4 4 Because the output voltage from the bridge deviates from the calibration CAL value due to the bridge voltage drop the calibration value must then be corrected For information on how to correct it refer to Correction of Calibrated CAL Value on page 33 to 34 The amplifier however has standard cable length ...

Page 40: ...ifications for input connectors of strain gages specified ty the Japan Society of Non destructive Inspection B C E D A B C D A Bridge power supply Bridge output Output Iutput Fig 4 3 Connection of transducer to the amplifier unit Extension cable CAC 117 M Junction cable CAC 101 M Fig 4 4 Connecting cable 2 Operating precautions on use of transducers Unstable and loose attachment of a transducer ma...

Page 41: ... with the input level of data recorders Especially with frequency modulated data recorders if an input signal greater than the allowable input level of the data recorder is applied it may be overmodulated causing failure in recording To avoid this the amplifier unit is capable of displaying excessive output voltage As shown in Fig 4 5 if the input signal exceeds the threshold level approximately 1...

Page 42: ... R0 1 Ω L0 200 μ R1 kΩ R2 kΩ Error due to Voltage Dividing Circuit DC 1 kHz 2 kHz 5 kHz 10 kHz 90 11 1 0 08 0 08 0 09 0 12 0 24 9 1 01 0 02 0 02 0 02 0 02 0 02 Table 4 5 Error due to Voltage Dividing Circuit 4 4 How to Read Measured Values This section describes how to read the measured values of a waveform recorded on a data acquisition device or recorder a Ａ B b Waveform Measurement CAL value Fi...

Page 43: ...0 6 strain As a result the relationship between calibration values and the physical amount is as follows irrespective of the bridge supply voltage Calibration Strain Calibration PhysicalAmount 2 000 x 10 6 strain 1 ton x 1 1 ton 1 000 x 10 6 strain 1 ton x 1 2 500 kg 500 x 10 6 strain 1 ton x 1 4 250 kg 200 x 10 6 strain 1 totn x 1 10 100 kg Table 4 5 The formula is as follows Calibration value of...

Page 44: ...ers are generally based on the full bridge configuration their output is made tomatch the quarter bridge configuration 3 Where the distance from the bridge box to the amplifier unit is long If the cable from the bridge box or a transducer to the amplifier unit is long the bridge supply will drop due to the conductor resistance of the cable This causes errors between the bridge output voltage and t...

Page 45: ...es and number of bridges are limited The input impedance of this amplifier unit is very high thereby enabling measurement with less interference between channels If multi channel measurement is to be conducted it is necessary to install a separate bridge power voltage 4 5 2 Differential Transformers Differential transformers are generally designed to provide high sensitivity Because dirrerential t...

Page 46: ... Connector Fig 5 1 Block diagram The signal fed from the bridge box or a transducer is applied to the INPUT connector of this productand amplified through a low noise preamplifier To this preamplifier are added the outputs of a 4 digit digital calibration voltage generating circuit CAL a resistance unbalance adjusting circuit R BAL and a capacitance unbalance auto eliminating circuit C BAL only th...

Page 47: ...t sales office or sales agent since your product needs to be modified at our side Separately charged Specifications Output current range Approximately 0 mA 20 mAor larger Current 4 mA 20 mA Load 500 Ω or less Output resistance Approx 5 MΩ Voltage current conversion accuracy 0 1 or less Fig 6 1 6 2 Case Function and Type Description Number of CH Type Bench top case 4CH AS16 104 6CH AS16 105 8CH AS1...

Page 48: ...onnect the grounding wire to gound 6 2 4 Caution on Rack Mount case Arack mount case is a case that is used for accommodation a case to 19 inch rack The rails on the left and right should be placed on the rails of the rack and then fix the case by using four attaching holes When using several cases install a fan unit between cases in order to release heat and maintain amplifier accuracy Avoid plac...

Page 49: ...r one minute First check the power supply voltage Power Supply Voltage Range DC Power Supply Voltage 10 V 30 V AC Power Supply Voltage 85 V 132 V 50 Hz or 60 Hz Simptom 1 The bridge is out of balance Set the range to OFF using measuring range selection knob 8 Measuring range LED 11 comes on at OFF is brirdge voltage 2V Does the green LED of level meter 2 come on No Adjustment for internal componen...

Page 50: ...e strain gage softly Then does the level of level meter 2 move Yes Remove the strain gage and paste a new strain gage No Set the measuring range to OFF using measuring range selection knob 8 OFF illuminates on measuring LED 11 Disconnect the bridge circuit from the amplifier unit and then measure the isolation resistance of the bridge circuit Does the isolation resistance have 60 MΩ Yes No Is the ...

Page 51: ... fuse slow blowing for DC power supply fuse When replaing be careful ofAC and DC 6 When installing fuse holder use a flat blade screw driver When pushing the fuse keep the fuse holder slit to be vertical to the amplifier unit Fig 7 5 dotted line and then press deeply and tum clockwise by 90 degree 7 Confirm that the fuse holder is fully installed in the amplifier unit as Fig 7 2 Also confirm that ...

Page 52: ...this unit is used in Japan domestic the voltage that exceeds the power supply voltage of 125 V cannot be supplied from the limitation of Electric safety low 4 Attach the amplifier cover so that the slit of the amplifier cover maches to the frame of the amplifier unit 5 Fasten the screws of upper face The fuse replacement is competed 6 When using 200 VAC power supply use optionalAC power supply cor...

Page 53: ...300 500 Hz 4 pole Butterworth type Filter descent response 24 dB oct Stability Temperature effect Zero drift Within 0 1 x 10 6 strain C Sensitivity Within 0 05 C Time effect Zero drift Within 0 5 x 10 6 strain 24 h Sensitivity Within 0 2 24 h Noise level 2 0 x 10 6 strain p p input conversion W B RANGE 200 Without FINE BV 2 V at 120 ohm bridge 0 6 x 10 6 strain p p input conversion DC to 100 Hz RA...

Page 54: ... V toAC132 V AC180 V toAC264 V Internal switch must be changed 9 VAor less DC power supply DC10 V to DC30 V 6 VAor less When DC power supply is used code AS16 401 only for DC power supply is separately needed Withstand voltage Between each input terminal A B C D E output and housing case AC1 kV 1 minute BetweenAC power input and input output or housing case AC1 5 kV 1 minute includes serge resisto...

Page 55: ... 10 100 1000 10000 W B 500Hz 300Hz 100Hz 30Hz Phase Properties 30Hz 100Hz 300Hz 500Hz W B 2kHz Phase Delay Degree Frequency Hz 50 40 30 20 10 0 10 1 10 100 1000 10000 W B 2 kHz 500Hz 300Hz 100Hz 30Hz 10Hz Frequency characteristics Amplitude ｄB 10Hz 30Hz 100Hz 300Hz 500Hz W B 2ｋHz Frequency Hz ...

Page 56: ...arts No 47226 Length 2m Metal BNC Metal BNC Output cable Parts No 0311 5022 Length 1m Metal BNC Banana shape plug Output cable Parts No 0311 5174 Length 2m Twin banana shape plug Metal BNC For connection with RAand ＤＬ Output cable Parts No 0311 5200 Length 2m Insulated BNC Metal BNC For connection with RA and ＤＬ AC power cable for unit and case AC 100V Parts No 47326 Length 2 5m Conversion plug fo...

Page 57: ...lug and separated DC power cable for case Parts No 47229 RED ＤＣ BLK ＤＣ Shield Length 2 5ｍ Cable diameter φ10 Core 1 25 ｍｍ2 Relay cable Parts No CAC 101 M Ａ BV Ｂ Input Ｃ BV Ｄ Input Ｅ Shield Length Consult us Cable diameter φ10 Core 0 5 ｍｍ2 Extension cable Parts No CAC 117 M Ａ BV Ｂ Input Ｃ BV Ｄ Input Ｅ Shield Length Consult us Cable diameter φ10 Core 0 5 ｍｍ2 Synchronous cable for between cases Parts...

Page 58: ...48 9 3 Outline dimensions 9 3 1 Single unit Unit mm ...

Page 59: ...49 9 3 2 Panel cut size Square hole Unit mm ...

Page 60: ...50 9 3 3 Bench top case Description Type Ａ B 4CH bench top case AS16 104 262 6 236 6CH bench top case AS16 105 362 6 336 8CH bench top case AS16 106 462 6 436 Unit mm ...

Page 61: ...51 9 3 4 Rack mount case Rail for rack Long hole Unit mm ...

Page 62: ...52 9 3 5 Bridge box FA410 072 model Unit mm ...

Page 63: ......

Page 64: ...e Product Sales Management 1 1 1 Katase Fujisawa shi Kanagawa ken 251 8531 Japan Tel 81 466 23 2681 Fax 81 466 22 7191 Sensing Device Business Unit FUJISAWA PLANT 1 1 1 Katase Fujisawa shi Kanagawa ken 251 8531 Japan Tel 81 466 22 7151 Fax 81 466 22 1701 KARUIZAWA PLANT 4106 73 Miyota Miyota machi Kitasaku gun Nagano ken 389 0293 Japan Tel 81 267 31 1309 Fax 81 267 31 1353 HOMEPAGE ADDRESS http ww...

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