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Keithley 7711 User Manual

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Model 7711/7712
User's Guide
PA-818 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

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   Summary of Contents for Keithley 7711

  • Page 1 Model 7711/7712 User’s Guide PA-818 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: Limitation Of Warranty

    WARRANTY Keithley Instruments, Inc. warrants this product to be free from defects in material and workmanship for a period of 1 year from date of shipment. Keithley Instruments, Inc. warrants the following items for 90 days from the date of shipment: probes, cables, rechargeable batteries, diskettes, and documentation.
  • Page 3: Safety Precautions

    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.
  • Page 5 Model 7711/7712 Keithley Instruments, Inc. 28775 Aurora Road User’s Guide Cleveland, Ohio 44139 (440) 248-0400 Fax: (440) 248-6168 www.keithley.com The information in this User’s Guide is organized as follows: Introduction on page 2 • Available accessories on page 2 Card configuration — schematic on...
  • Page 6: Available Accessories

    Applications Engineers at 1-800-KEITHLEY (U.S. and Canada only). The Model 7711/7712 is a single-pole dual 1 × 4 RF Multiplexer module (8 channels, no measurement capability). The 1 × 4 multiplex is a cascading tree design — one of the channels of each bank is always connected to a common out. The 1 × 4 multiplex is also referred to as a single-pole 4-throw (SP4T) switch.
  • Page 7: Card Configuration-schematic

    (1 of 4 tree structure). Also, channels 1 and 5 are normally closed to OUT A and OUT B, respectively. NOTE The Model 7711/7712 relays are set to close channels 1 and 5 a few seconds after either a power cycle or a *RST command is issued (see Figure 1 for a schematic).
  • Page 8: Blocking Matrix

    1 × 12 MUX using two Model 7711 cards. Figure 3 Channels 3 and 4 (of 7711 in slot 1) may also be connected to other banks that will create a 1 × 12 NOTE multiplexer (or a 1 ×...
  • Page 9 Figure 2 1 x 8 MUX expansion 7711 SLOT 1 OUT B OUT A 7711 SLOT 2 OUT B OUT A NOTE: The simplified schematic is shown in the power up state (Channels 1 and 5 are closed for cards in slots 1 and 2).
  • Page 10 1 with a 50Ω load or an unconnected Ch8 (Ch12) S46-SMA-0.5 cable. NOTE: Channels 5-8 on the 7711/7712 To close to this crosspoint (CH11) send: in slot 1 correspond to crosspoints ROUTe:MULTiple:CLOSe(@103,107) Channels 9-12 of the 1 × 12 SP12T...
  • Page 11 4 × × × × 4 Blocking matrix example shows how to connect a single Model 7711 in a 4 × 4 blocking matrix. This configuration provides a convenient way Figure 4 to connect four DUTs to four different test instruments. In this configuration, one channel of bank 1 (channels 1 – 4) may be routed to any channel of bank 2 (channels 5 –...
  • Page 12 7711/7712 modules. This configuration provides a convenient way to simultaneously connect up to 4 DUTs to 4 different test instruments. Use a short coaxial cable to connect the OUTs of each module as shown. contains a couple of sample commands to control the matrix.
  • Page 13 Figure 5 4 x 4 Non-blocking matrix expansion 7711 OUT B OUT A SLOT 3 SLOT 4 7711 7711 OUT B OUT A OUT B OUT A SLOT 1 SLOT 2 7711 OUT B OUT A NOTE: The simplified schematic...
  • Page 14: Wiring Procedure

    Wiring procedure WARNING Do not exceed the maximum specifications for the Model 7711/7712 module. Refer to Appendix A for specifications. The default closed channels are 1 and 5 — the lowest number in each bank. At power-up, the lowest numbered channel in each bank will always be closed.
  • Page 15: Channel Assignments

    For the Model 7711/7712, multiple channel operation provides control of one or two Model 7711/7712 modules in a Model 2700/2701 (or up to 5 in a Model 2750). OUT A automatically switches as appropriate for channels 1 – 4, and OUT B automatically switches as appropriate for channels 5 –...
  • Page 16: Unlocking Calibration

    DMM measurements None of the channels of the 7711/7712 module are connected to the internal DMM (the channels cannot be connected to the backplane). If your test system requires DMM measurements, you can use a measure card in one of the other mainframe slots or you can use the front panel inputs of the Model 27xx.
  • Page 17: Calibration Subsystem

    :SPARameters <string> If the card in this slot is not a valid RF card (Model 7711, etc.), then a -221, “Settings Conflict” error is returned. Any valid ASCII information can be stored in the string space; it is not error checked in any way.
  • Page 18: System Subsystem

    The card is organized into banks of channels, and one channel must always be closed within that "single, no-open" type — bank. The Model 7711 is representative of this class with two banks of 4 channels each. Returns either a 1 or 0. (For a 7711/7712 card, a 1 is returned.)
  • Page 19: Measurement Considerations

    Model 2700/2702 to have an additional 6µV offset uncertainty when measuring DC voltages. For the Model 2750, the precision low level circuitry may cause uncertainty of 30µV. Moving the Model 7711/7712 to a higher number slot will reduce this uncertainty.
  • Page 20 1. The above listed uncertainties are guaranteed by design for thermocouple types J, K, N, T, E, R, S, B. 2. When the Model 7711/7712 and Model 7708 are used together, the Model 7711/7712 must be installed in the lowest numbered slot.
  • Page 21 Table 8 Percent of additional uncertainty Percent of additional Table 7 Channels closed uncertainty (from 4 and 8 100% 2 and 8 3 and 8 4 and 6 4 and 7 1 and 8 2 and 6 2 and 7 3 and 6 3 and 7 4 and 5...
  • Page 22: Application Example

    TEMP limits are 70 and 125 C. '' 3) RF switching to an oscilloscope is obtained using a 7711 where the AC ripple is measured. '' 4) A 7705 is used to switch loads and to control the line input voltage to the DUTs (power supplies).
  • Page 23 Option Explicit '' --------------------------------------------------------------------------------------------------------------------- '' Constants '' --------------------------------------------------------------------------------------------------------------------- Const MAXLEN = 6400 ' Constant used with ENTER function. Const LENGTH = 6400 ' Constant used with ENTER function. Const ENTER_TIMEOUT = 3000 ' Length of time the ENTER function will ' wait for a query.
  • Page 24 Private Sub Configure_7700_CONT(Channel_Num As Integer) Dim Channel_Str As String Channel_Str = ",(@" & CStr(Channel_Num) & ")" Call send(ADDRESS, "SENS:FUNC 'RES'" & Channel_Str, Status) ' Set channel to measure 2W ohms. Call send(ADDRESS, "SENS:RES:RANG 10" & Channel_Str, Status) ' Set resistance range. Call send(ADDRESS, "SENS:RES:NPLC 0.1"...
  • Page 25 Channel_Str = "(@" & CStr(Channel_Num) & ")" ' Convert channel to ASCII string parameter. Call send(ADDRESS, "ROUT:MULT:CLOS " & Channel_Str, Status) ' Route channel on 7711 to Out A. For J = 1 To NUMBER_OF_FUNCTIONS ' Loop for each measurement function.
  • Page 26: Performance Verification

    For the Model 7711, verify at 100MHz, 500MHz, 1GHz, 1.5GHz, and 2GHz. For the Model 7712, verify at 500MHz, 1GHz, 2.5GHz, and 3.5GHz. Refer to the VSWR section of the Model 7711 or 7712 specification values at the end of this User’s Guide for acceptable limits.
  • Page 27: Insertion Loss

    For the Model 7712, verify at 500MHz, 1GHz, 2.5GHz, and 3.5GHz. Refer to the Insertion Loss section of the Model 7711 or 7712 specifications values for acceptable limits. 6. Repeat procedure for remaining channels. Change the network analyzer connection to Port 2 to OUT B when verifying...
  • Page 28: Replaceable Parts

    For the Model 7712, verify at 500MHz, 1GHz, 2.5GHz, and 3.5GHz. Refer to the Ch-Ch cross-talk section of the Model 7711 or 7712 specifications values for acceptable limits. 6. Repeat procedure for remaining channels in both banks. There are six possible combinations for each bank of 4 channels (combinations in bank 1: 1-2, 1-3, 1-4, 2-3, 3-4).
  • Page 29: Ordering Information

    Ordering information To place an order, or to obtain information concerning replacement parts, contact your Keithley representative or the factory (see back cover for addresses). When ordering parts, be sure to include the following information: • Card model number (Model 7711/7712).
  • Page 30 Figure 12 Model 7711 component layout...
  • Page 31 Figure 13 Model 7712 component layout...
  • Page 32 Table 9 Model 7711/7712 parts list Circuit designation Description Keithley part no. +5VD+5VR,GNDD SURFACE MOUNT PCB TEST POINT CS-1026 C1,C3,C6,C19 CAP, 47P, 5%, 100V, CERAMIC (0805) C-465-47P C2,C4,C5,C18,C20-C24 CAP, .1UF, 20%, 50V CERAMIC(1206) C-418-.1 C7-C17 CAP, 470U, 20%, 25V, ALUM ELEC...
  • Page 33 Female SMA to Male N-Type Adapter S46-SMA-1 SMA cable, male to male, 0.3m (1 ft.) S46-SMA-0.5 SMA cable, male to male, 0.15m (0.5 ft.) * Refer to 7711/7712 User’s Guide (PA-818) for measurement considerations. HW 2/05/02 Rev. A Page 1 of 2...
  • Page 34 7711 50Ω Ω 2GHz Multiplexer Specifications AC Performance: (Includes end of life) For Z = 50Ω load source < < 100MHz 500MHz 1GHz 1.5GHz 2GHz Insertion 0.4dB 0.6dB 1.0dB 1.2dB 2.0dB Loss VSWR Ch-Ch -85dB -65dB -55dB -45dB -35dB Cross-talk Specification assumes 50Ω...
  • Page 35 Female SMA to Male N-Type Adapter S46-SMA-1 SMA cable, male to male, 0.3m (1ft) S46-SMA-0.5 SMA cable, male to male, 0.15m (0.5 ft.) * Refer to 7711/7712 User’s Guide (PA-818) for measurement considerations. HW 2/05/02 Rev. A Page 1 of 2...
  • Page 36 AC Performance: (Includes end of life) For Z = 50Ω load source < < 500MHz 1GHz 2.4GHz 3.5GHz Insertion Loss 0.5dB 0.65dB 1.1dB 1.3dB VSWR 1.15 1.45 1.45 Ch-Ch Crosstalk -75dB -70dB -50dB -45dB Specification assumes 50Ω termination. ENVIRONMENTAL Operating Environment: Specified for 0°C to 50°C Specified for 80% RH at 35°C Storage Environment: −25°C to 65°C Weight: <.50Kg (1.1 lb.)
  • Page 38 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) •...

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