Related Manuals for Keithley 7710
Summary of Contents for Keithley 7710
- Page 1 Model 7710 Multiplexer 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 3 Keithley products are designed for use with electrical signals that The instrument and accessories must be used in accordance with its are rated Measurement Category I and Measurement Category II, as specifications and operating instructions or the safety of the equip-...
- Page 4 Keithley Instru- symbol on an instrument indicates that the user should re- ments. Standard fuses, with applicable national safety approvals, fer to the operating instructions located in the manual.
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Page 5: Table Of Contents
Fax: (440) 248-6168 www.keithley.com Introduction NOTE The Model 7710 will operate properly when installed in one of the following Model 27xx instruments: Model 2700 – Equipped with B05 (or later) firmware Model 2701 – Equipped with A01 (or later) firmware Model 2750 –... -
Page 6: Operating Instructions
User’s Manual), they can be manually configured. For example, assume a 7710 module is installed in slot 1 of the mainframe and an external source is connected to Card Source input. To connect the source to channel 11 only, multiple channel... - Page 7 CH7 and CH17 CH3 and CH13 CH8 and CH18 CH4 and CH14 CH9 and CH19 CH5 and CH15 CH10 and CH20 Figure 1 Simplified schematic of Model 7710 Card Source Cold junction Ref x3 Channel 1 Channel 21 (see Note) (Channels 2-9)
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Page 8: Fast Scanning
Fast scanning Fast scanning is achieved by using the 7710 module (which has high-speed solid state FET relays) with the Model 2701 mainframe. With mainframe speed settings optimized for DCV or ohms mea- surements, the Model 2701 can scan approximately twice as fast as the Models 2700 and 2750. - Page 9 ’ 7710 DCV FAST SCAN EXAMPLE FOR THE 2701 MODULE ’ ’ This program is an example of configuring a simple DCV scan on the 7710 with a 2701 mainframe. ’ This program acquires readings at a rate of 500/ sec.
- Page 10 If txtAddress.Text = "" Then ConnectTo2701 = False Exit Function End If With Winsock1 .Protocol = sckTCPProtocol .RemoteHost = txtAddress.Text .RemotePort = 1394 .Connect End With ' Check for proper connection. Time0 = Timer While Timer - Time0 < 10! And Winsock1.State <> sckConnected: DoEvents: Wend If Winsock1.State <>...
- Page 11 DataReceived = False ' Remain in loop until mainframe is finished sending data. DoEvents Loop Until DataReceived QueryKI = Data ' Return reading End Function ’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’ ’ This event occurs when host computer is finished sending data . ’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’ Private Sub Winsock1_SendComplete() DataSent = True End Sub ’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’...
- Page 12 Out_str = Out_str + Ch i = i + 1 Wend Text1.Text = Out_str End Sub ’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’ ’ This is the main function for the 7710 test program. ’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’’ Private Sub ScanDCV() Dim NumReadings As Integer Dim Resp As String Dim Cmd As String If Not (ConnectTo2701) Then ' Open connection to 2701.
- Page 13 NumReadings = 1024 ’ Take 1024 readings. Resp = Space$(80) Cmd = Space$(80) ’ Configure the instrument for scanning DCV. ’ SendKI ("*RST") ' Put instrument in known state. SendKI ("FORM:DATA ASCII") ' Format data as an ASCII string. SendKI ("FORM:ELEM READ") ' Return the reading with units only.
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Page 14: Operating Considerations
Operating considerations Low-ohms measurements For resistances in the normal range (>100 Ω ), the 2-wire method ( Ω 2) is typically used for ohms measurements. For low-ohms ( ≤ 100 Ω ), the signal path resistance in series with the DUT could be high enough to adversely affect the measurement. -
Page 15: Voltage Measurements
0Ω 1.2Ω Overflow Overflow 10Ω 0Ω 2Ω 0Ω 7Ω 3Ω 12Ω Figure 2 Low-ohms measurements using 4-wire method 2750 DMM with 7710 card CH11Hi LEAD1 Sense Hi Ch11 Hi CH1Hi LEAD2 Input Hi Ch1 Hi TEST TEST TEST LEAD3 CH1Lo... -
Page 16: Insertion Loss
An AC signal can be induced into adjacent channel paths on the 7710 card. In general, crosstalk increases as frequency increases. For the 7710 card, crosstalk is specified for an AC signal routed through the module to a 50 Ω load. Crosstalk is expressed as a dB magnitude at a specified frequency. The specification for crosstalk is provided in the “Specifications”... -
Page 17: Heat Sink Temperature Measurements
Measuring the temperature of a heat sink is a typical test for a system that has temperature mea- surement capability. However, the 7710 card cannot be used if the heat sink is being floated at a dangerous voltage level (>60V). An example of such a test is shown in... -
Page 18: Card Connections
Screw terminals on the switching module are provided for connection to DUT and external circuitry. The Model 7710 uses quick-disconnect terminal blocks. A terminal block can be wired outside the module and then plugged back in. These terminal blocks are rated for 25 connect/disconnects. -
Page 19: Wiring Procedure
Do not attempt to perform this procedure unless qualified to do so. Use the following procedure to wire the Model 7710 card. Make all connections using the correct wire size (up to 20 AWG). Also, make sure to add supplementary insulation around the harness for... - Page 20 Figure 6 Proper procedure to remove terminal blocks Step 1. Place flat-head screwdriver under connector and gently push up to loosen it. Step 2. Pull connector directly up with needle nose pliers. CAUTION: DO NOT rock connector from side to side. Damage to the pins could result.
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Page 21: Typical Connections
Figure 7 Wire dressing Cable Tie Typical connections The following examples show typical wiring connections for the following types of measurements: • Thermocouple connections, see Figure 8 Ω • 2-wire and thermistor connections, see Figure 9 Ω • 4-wire and RTD connections, see Figure 10 •... - Page 22 Figure 8 Thermocouple connections Channel 1 (Channels 2-19) Thermocouple Channel 20 Figure 9 Ω Ω Ω Ω 2-wire and thermistor connections Channel 1 Resistor or (Channels 2-19) Thermistor Channel 20...
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Page 23: Connection Log
AC Voltage Channel 1 (Channels 2-19) Channel 20 Connection log Make a copy of Table 2 and the WARNING and affix them to the cover of the Model 7710. Use this to record connection information and channel descriptions as needed. - Page 24 The system’s maximum voltage, including other switch modules and front panel terminals, is limited to 60V peak-to-peak AC or DC between any terminal and chassis or any two terminals when the 7710 is installed. Table 2 Connection log Model 7710...
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Page 25: Calibration
“Extender board connec- tions” above). 2. With the power off, install the Model 7710/7797 combination in Slot 1 and select the rear inputs with the INPUTS switch. Allow three minutes for thermal equilibrium. 3. Accurately measure and record the cold temperature of the Model 7710 card surface at the center of the card with a digital thermometer. - Page 26 “Extender board connections”). 2. With the power off, install the Model 7710/7797 combination in Slot 1, and select the rear inputs with the INPUTS switch. Allow three minutes for thermal equilibrium. 3. Accurately measure and record the cold temperature of the Model 7710 card surface at the center of the card.
- Page 27 CONTACT RESISTANCE: <10Ω per channel or <5Ω per GENERAL conductor. Refer to the Model 7710 User’s Guide for measurement considerations when used in a Model 2750 on the 1Ω or 10Ω 20 CHANNELS: 20 channels of 2-pole relay input. All channels ranges.
- Page 28 Specifications are subject to change without notice. All Keithley trademarks and trade names are the property of Keithley Instruments, Inc. All other trademarks and trade names are the property of their respective companies. Keithley Instruments, Inc. 28775 Aurora Road • Cleveland, Ohio 44139 • 440-248-0400 • Fax: 440-248-6168 1-888-KEITHLEY (534-8453) •...