Signametrics Corporation SM4020 Operator'S Manual Download Page 61

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Signametrics

Summary of Contents for SM4020

Page 1: ...and may contain references to products or services no longer supported by Agilent For the latest information on Agilent s modular test and measurement products go to www agilent com find modular Or in...

Page 2: ...0 20 Channels Relay Multiplexer Model SM4022 20 Channels Instrumentation Relay Multiplexer Model SM4040 40 Channels Relay Multiplexer Model SM4042 40 Channels Instrumentation Relay Multiplexer Signame...

Page 3: ...rising out of the use of or inability to use Signametrics products even if Signametrics has been advised of the possibility of such damages Because some states do not allow the exclusion or limitation...

Page 4: ...ation 18 4 1 6 Disabled 18 4 2 SCANNER OPERATIONS 18 4 2 1 Trigger Output 18 4 2 2 Trigger Input 19 4 2 3 Auto Scan Operation 19 4 2 4 Triggered Auto Scan Operation 19 4 2 5 Triggered Scan Operation 2...

Page 5: ...r 37 SCANGetHwVer 38 SCANGetID 38 SCANGetManDate 39 SCANGetScanList 39 SCANGetShortedChannel 40 SCANGetStepTime 40 SCANGetTriggerIn 41 SCANGetType 41 SCANGetVer 42 SCANInit 42 SCANIsInitialized 43 SCA...

Page 6: ...at the common mode voltage These voltages can be lethal and may KILL During and after installing your Scanner check to see that there are no wires or ribbon cables from your PC trapped inside the Sca...

Page 7: ...TwoWire configuration the scanner acts like a 20 or 40 channel multiplexer In the FourWire configuration it automatically selects two simultaneous channels allowing a DMM or other device to connect to...

Page 8: ...n however since it does not offer the protection of the predefined configurations This could result in shorting some hot lines constituting in potential hazard to the user from any thing that is conne...

Page 9: ...5 106 Trigger input Trigger output Thermocouple Cold Junction Capable Typical Closure Time ms 12 4 12 4 Typical Release Time ms 5 2 5 2 Actuation Time ms 1 15 5 15 5 Actuation Time Settable Range ms 1...

Page 10: ...Range 0 C to 50 C operating Size 9 2 X 4 4 Power 5 volts 550 mA maximum Note Signametrics reserves the right to make changes in materials specifications product functionality or accessories without n...

Page 11: ...apply measurement voltages to your computer causing personal injury and or damage to your computer Caution Only install the Scanner module with the power turned OFF to the PC Use extreme care when plu...

Page 12: ...Ch13Hi Channel 13 High 24A Ch34Lo Channel 34 Low 9C Ch5Lo Channel 5 Low 25C Ch40Hi Channel 40 High 9B Ch13Lo Channel 13 Low 25B Ch37Lo Channel 37 Low 9A Ch14Hi Channel 14 High 25A Ch34Hi Channel 34 Hi...

Page 13: ...ck the DHi and DLo terminals should not be used and a configuration involving them should not be selected Therefore configurations such as FourGroups or SixWire should not be selected and when selecti...

Page 14: ...ogic output 3 5 Starting the Control Panel After installing the software you can verify the installation and gain familiarity with the Scanner by exercising its measurement functions using the Windows...

Page 15: ...control panel above Relay Buttons These buttons are context sensitive Depending on the selected Configuration these buttons allow the closing and opening of the various channel relays In the Universa...

Page 16: ...ction describes in detail the Scanner s operations and practices To gain familiarity with the SM4000 series Scanners run the Windows SETUP EXE to install the software then run the Scanner control pane...

Page 17: ...ces for low level voltage measurements as well as for Ohms and temperature It is not unusual to find scanners with very high thermal voltages The following table quantifies the effect of Thermal TEMF...

Page 18: ...ire guarded connection the A bus is connected to the DMM source leads the B bus to the sense leads and the C bus to the Guarded point Make sure the polarity of the lines is consistent It should e note...

Page 19: ...are available 4 1 6 Disabled In the Disabled configuration all relays including channel and configuration relays are open This is the default configuration selected on power up or initialization 4 2 S...

Page 20: ...ANAbort command to the Scanner during the scan Use the SCANOpenAllChannel function at the end of the scan if you wish to open the last selected channel The Trigger output signal can be used to synchro...

Page 21: ...nated by sending SCANAbort command to the Scanner Use the SCANOpenAllChannel function if you wish to open the last selected channel Figure 4 8 Positive edge Triggered Scan operation is a hardware init...

Page 22: ...t busy Operations using the Scan List include SCANAutoScan SCANSetupStep SCANStep SCANStepCmd and SCANTrigAutoScan When several Scanners are connected to form a larger channel count a zero entry disab...

Page 23: ...f the Channel Relays test and the Configuration Relays test They provide the confidence of knowing that the Scanner is in good repair and can continue in its operation The two tests are applied to a s...

Page 24: ...set for positive sense With these parameters the rising edge of the trigger output is delayed by 40ms 50ms 10ms from the time the relays are closed and settled and the scanning speed is 10 channels p...

Page 25: ...4 Wire measurements SM4040 SM4042 It is important to consider system settling time when making measurements Time delays exist in any measurement system These delays are contributed by various sources...

Page 26: ...tion DoEvents Make sure Scanner is ready Wend There are several SM2040 family commands to considered for this operation DMMSetTrigRead DMMSetBuffTrigRead DMMReadTrigVal DMMReady DMMReadBuffer and DMMR...

Page 27: ...bus Low 5 0 SM4040 Scanner Family Windows Interface The windows release supports Windows98 Windows95 WinNT4 0 and Windows2000 The primary means of controlling the scanners is a DLL file that interface...

Page 28: ...be used with the various functions Msvbvm50 dll Visual Basic run time interpreter Usually install in your C WINDOWS SYSTEM or equivalent directory If it is not already installed run Msvbvm50 exe for...

Page 29: ...g SCANErrStr 5 2 1 Multiple Card Operations under Windows Single EXE operation Accessing multiple Scanners from a single executable is the most common way for running up to 10 Scanners using the Windo...

Page 30: ...rrent configuration The source code file GLOBAL BAS in the installed VisBasic sub directory contains the function declarations and the various ranges rates and other parameters that are required These...

Page 31: ...with message start Timer While Timer start 2 delay for 1 1 seconds DoEvents Wend End If SimplePanel TextLine Text End If End Sub SimplePanel frm Form file contents Option Explicit Private Sub CommandS...

Page 32: ...ction of the Windows command language Those commands that pertain to only the SM2040 are indicated Most functions return an error code The code can either be retrieved as a string using SCANErrString...

Page 33: ...using this command Steptime must be greater than the Actuation time This function is not applicable for the following configurations Universal and Disabled Being a polled function following this comm...

Page 34: ...oltage low current signal causes deposits of contaminants as well as oxidations to bounce off or be pinched through thus resulting in cleaner contacts Doing this on a regular basis will prolong the co...

Page 35: ...e Meaning SCAN_OKAY Operation successfully completed Negative Value Error code Example int status SCANClosePCI 0 SCANDelay H W access Command Polled Command Description Wait for a given time include S...

Page 36: ...r code iErrorCode The error string is placed at lpszError Parameter Type Description iErrorCode int Error code iBuffLength int The maximum available length of the string buffer lpszError LPSTR Points...

Page 37: ...Act int i SCANGetActuationTime 0 tAct SCANGetBusInfo H W access Command Polled Command Description Returns the PCI Bus and Slot numbers for the selected SCANNER int SCANGetBusInfo int nScan int bus in...

Page 38: ...are numbered starting with zero Return Value The return value is an integer configuration code or an error code Value Meaning Positive Value Configuration code Negative Value Error code Example int i...

Page 39: ...anner Scanners are numbered starting with zero Return Value Scanner hardware code or an error code Value Meaning Positive value Hardware version code Negative Value Error code Example int HWVer SCANGe...

Page 40: ...Month int A pointer to an integer where the month is stored Day int A pointer to an integer where the day is stored Year int A pointer to an integer where the year is stored Return Value Integer erro...

Page 41: ...hes and detects a shorted channel starting with channel 1 It returns the first channel which is found to be shorted If none is found the returned value is 0 A valid returned value must be 0 to 40 0 in...

Page 42: ...int status SCANGetStepTime 0 Tstep SCANGetTriggerIn H W access Command Polled Command Description Read the state of the Trigger Input line include SM4040 H int SCANGetTriggerIn int iScan Remarks This...

Page 43: ...t type SCANGetType 0 SCANGetVer H W access Command Polled Command Description Return the Scanner s DLL software driver version include SM4040 H int SCANGetVer double FAR lpfResult Remarks This functio...

Page 44: ...sInitialized H W access Command Polled Command Description Return the active status of the Scanner include SM4040 H int SCANIsInitialized int iScan Remarks This function returns the status of the Scan...

Page 45: ...constants Value Meaning SCAN_OKAY Operation successfully completed Negative Value Error code Example int active SCANOpenAllChannels 0 SCANOpenPCI H W access Command Polled Command Description Open th...

Page 46: ...iChan Remarks This is the primary channel selection function for the multiplexed configurations of the scanner It opens currently closed channel s in a configured group and then closes channel iChan...

Page 47: ...lowing the execution of the SCANSelectChannelCmd it should not be assumed the scanner is ready SCANReady must be used and return TRUE to proceed SCANReady not only checks for readiness but it also cle...

Page 48: ...to 50ms SCANSetChannelRelay H W access Command Polled Command Description Close or open a channel relay include SM4040 H include ScanUser H int SCANSetChannelRelay int iScan int iState int iChan Remar...

Page 49: ...the ScanUser H file It consumes t Actuation to set the configuration Setting configuration to Universal or Disabled opens all relays Parameter Type Description iScan int Identifies the Scanner Number...

Page 50: ...nList int iScan int iAddress int iChannel Remarks This function writes a single entry to the Scan List table on board the Scanner iAddress is the location to be written to and iChannel is the channel...

Page 51: ...resolution is 0 25ms Parameter Type Description iScan int Identifies the Scanner being addressed dStep double Sets the step time Allowed value is between 1ms to 850ms Return Value The return value is...

Page 52: ...code Value Meaning SCAN_OKAY Operation successfully completed Negative Value Error code Example int status SCANSetupStep 0 Set for step scan operation SCANStep H W access Command Polled Command Descr...

Page 53: ...like SCANStep it does not wait for completion of the selection operation SCANReady must be used in order to verify the selected channel is closed and the scanner is ready for a new command It is neces...

Page 54: ...sfully completed Negative Value Error code Example status SCANTerminate 0 Terminate scanner 0 SCANTestChanIntegrity H W access Command Polled Command Description Test a channel relay for integrity inc...

Page 55: ...e relay including bounce time lpdBounc is returned This value maybe used to fine tune the Scanner for maximum switching performance by setting the Actuation time using SCANSetActuationTime The Channel...

Page 56: ...es the Scanner being addressed lpdBounce Doulbe Pointer where the bounce time value is to be saved iConf int Identifies the configuration tree relay to be tested Return Value Integer error code Value...

Page 57: ...et to ENABLED the trigger input line is enabled If iEdge is set to POSITIVE Positive Edge will activate operations See definitions in ScanUser H file Parameter Type Description iScan int Identifies th...

Page 58: ...t iPoints Remarks Setup for a hardware triggered step scanning operation iPoints is the number of points in the scan The ScanList must be pre loaded prior to issuing of this command After receiving th...

Page 59: ...cs 58 Return Value The return value is one of the following constants Value Meaning SCAN_OKAY Operation successfully completed Negative Value Error code Example SCANTrigScan 0 150 150 H W driver scan...

Page 60: ...SMX2044 DMMs It plugs into the scanner s 96 pin DIN connector Signametrics SM40L Loop back test connector Required for self tests and contact cleaning operations Female 96 position mating connector w...

Page 61: ...Signametrics 60...

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