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17

Figure 7

Wire dressing

Typical connections

The following examples show typical wiring connections for the following types of measurements:

•

Thermocouple connections, see

•

Ω

2-wire and thermistor connections, see

•

Ω

4-wire and RTD connections, see

•

Voltage connections (DC or AC), see

Cable Tie

Topics

Topics

Topics

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Summary of Contents for 7710

Page 1: ...Model 7710Multiplexer Card User s Guide PA 847 Rev B 8 03 A G R E A T E R M E A S U R E O F C O N F I D E N C E...

Page 2: ......

Page 3: ...that a shock hazard exists when voltage levels greater than 30V RMS 42 4V peak or 60VDC are present A good safety practice is to expect that hazardous voltage is present in any unknown circuit before...

Page 4: ...electric shock and fire replacement components in mains circuits including the power transformer test leads and input jacks must be purchased from Keithley Instru ments Standard fuses with applicable...

Page 5: ...rmistor thermocouple Built in cold junction reference for TC temperature Plug in screw terminal connections WARNING Before operating the Model 27xx with an accessory card verify that the card is prope...

Page 6: ...m through the instrument backplane To prevent damaging the 7710 module or creating a shock hazard the entire test system and all of its inputs should be de rated to 60V DC 42V rms Card configuration F...

Page 7: ...Channel 20 HI LO Channels 12 19 HI LO Sense HI LO Input Channel 23 2 Pole Closed 4 Pole Open see Notes To Model 27xx Backplane Channel 21 see Note Backplane isolation Channel 22 see Note Backplane iso...

Page 8: ...DEL 0 Sets trigger delay to 0 seconds FORM DATA ASCII Formats data as an ASCII string N A for 2701 FORM ELEM READ Returns each reading with units only CALC3 OUTP OFF Disables limit outputs CALC3 LIM1...

Page 9: ...Dim DataSent As Boolean Dim Data As String A Visual Basic function call when a Form program window is opened Private Sub Form_Load TestRunning False End Sub These two functions exit the program and cl...

Page 10: ...to 2701 MsgBox Cannot connect to LastAddress 48 IP Connect Error ConnectTo2701 False Exit Function End If Connection to 2701 found ConnectTo2701 True End Function Event to capture data from mainframe...

Page 11: ...e 2701 over the ethernet connection Sub SendKI Cmd As String Send command to mainframe and wait for data sent event DataSent False Winsock1 SendData Cmd Chr 13 Do DoEvents Loop Until DataSent End Sub...

Page 12: ...ng Dim i As Long i Len Resp Out_str i 1 While i Len Resp Ch Mid Resp i 1 If Ch Then Ch vbCrLf End If Out_str Out_str Ch i i 1 Wend Text1 Text Out_str End Sub This is the main function for the 7710 tes...

Page 13: ...off limit test SendKI SYST LSYN OFF Turn off line sync SendKI DISP ENAB OFF Turn off display SendKI SYST AZER STAT OFF Turn off auto zero SendKI CALC3 LIM1 STAT OFF ScanList Turn off limits SendKI TRI...

Page 14: ...lained as follows 4 wire method The 4 wire Kelvin connection method using the 4 function as shown is Figure 2 is generally preferred for low ohms measurements The 4 wire method cancels the effects of...

Page 15: ...VSHI VSLO V ITEST VM Input Hi Input Lo 2750 DMM with 7710 card Sense Hi Sense Lo RDUT VM ITEST VSHI VSLO RDUT ITEST ITEST VM Virtually no current flows in the high impedance sense circuit due to the h...

Page 16: ...0 card crosstalk is specified for an AC signal routed through the module to a 50 load Crosstalk is expressed as a dB magnitude at a specified frequency The specification for crosstalk is provided in t...

Page 17: ...ply the floating volt age to the card Figure 3 Example of an unsafe measurement practice Card handling precautions The solid state relays used on the 7710 card are static sensitive devices Therefore t...

Page 18: ...isconnects WARNING The information in this section is intended for qualified service personnel Do not attempt to perform this procedure unless qualified to do so Figure 4 shows how to access the screw...

Page 19: ...re 4 3 If desired pull the appropriate quick disconnect terminal block off the card 4 Using a small flat blade screwdriver loosen terminal screws and install wires as desired refer to Figure 6 Figure...

Page 20: ...Table 2 on page 18 and affix it to the module cover 8 Close and lock cover NOTE For maximum system performance all measurement cables should be less than 3 meters Step 1 Place flat head screwdriver un...

Page 21: ...how typical wiring connections for the following types of measurements Thermocouple connections see Figure 8 2 wire and thermistor connections see Figure 9 4 wire and RTD connections see Figure 10 Vol...

Page 22: ...rmocouple connections Figure 9 2 wire and thermistor connections Channel 1 HI LO Channel 20 HI LO Channels 2 19 Thermocouple Channel 1 HI LO Channel 20 HI LO Channels 2 19 Resistor or Thermistor Topic...

Page 23: ...them to the cover of the Model 7710 Use this to record connection information and channel descriptions as needed Channel 1 HI LO Channel 10 HI LO Channels 2 9 Channel 11 HI LO Channel 20 HI LO Channel...

Page 24: ...erminal and chassis or any two terminals when the 7710 is installed Table 2 Connection log Model 7710 Channel Color Description Card Source H L Card Sense H L CH1 H L CH2 H L CH3 H L CH4 H L CH5 H L C...

Page 25: ...sible to minimize card heating that could affect calibration accuracy Allow the Model 27xx to warm up for at least two hours Front panel Model 7710 calibration 1 Connect the Model 7710 to the Model 77...

Page 26: ...7710 card surface at the center of the card 4 Press in and hold the Model 27xx OPEN key while turning on the power 5 Enable calibration by sending the CODE command For example the default command is C...

Page 27: ...61326 1 CONTACT LIFE 1010 operations at cold switching or max signal level guaranteed by design CONTACT RESISTANCE 10 per channel or 5 per conductor Refer to the Model 7710 User s Guide for measuremen...

Page 28: ...60 11 77 26 GERMANY Landsberger Strasse 65 82110 Germering 089 84 93 07 40 Fax 089 84 93 07 34 GREAT BRITAIN Unit 2 Commerce Park Brunel Road Theale Berkshire RG7 4AB 0118 929 75 00 Fax 0118 929 75 1...

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