Keithley 7711, 7712 User Manual

Model 7711/7712

User’s Guide

PA-818 Rev. B / 8-03

A GREATER MEASURE OF CONFIDENCE

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.

During the warranty period, we will, at our option, either repair or replace any product that proves to be defective.

To exercise this warranty, write or call your local Keithley representative, or contact Keithley headquarters in Cleveland, Ohio.
You will be given prompt assistance and return instructions. Send the product, transportation prepaid, to the indicated service
facility. Repairs will be made and the product returned, transportation prepaid. Repaired or replaced products are warranted for
the balance of the original warranty period, or at least 90 days.

LIMITATION OF WARRANTY

This warranty does not apply to defects resulting from product modification without Keithley’s express written consent, or
misuse of any product or part. This warranty also does not apply to fuses, software, non-rechargeable batteries, damage from
battery leakage, or problems arising from normal wear or failure to follow instructions.

THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING ANY
IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. THE REMEDIES PRO­VIDED HEREIN ARE BUYER’S SOLE AND EXCLUSIVE REMEDIES.

NEITHER KEITHLEY INSTRUMENTS, INC. NOR ANY OF ITS EMPLOYEES SHALL BE LIABLE FOR ANY DIRECT,
INDIRECT, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF ITS
INSTRUMENTS AND SOFTWARE EVEN IF KEITHLEY INSTRUMENTS, INC., HAS BEEN ADVISED IN ADVANCE
OF THE POSSIBILITY OF SUCH DAMAGES. SUCH EXCLUDED DAMAGES SHALL INCLUDE, BUT ARE NOT LIM­ITED TO: COSTS OF REMOVAL AND INSTALLATION, LOSSES SUSTAINED AS THE RESULT OF INJURY TO ANY
PERSON, OR DAMAGE TO PROPERTY.

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5/03

Safety Precautions

The following safety precautions should be observed before using
this product and any associated instrumentation. Although some in­struments and accessories would normally be used with non-haz­ardous voltages, there are situations where hazardous conditions
may be present.

This product is intended for use by qualified personnel who recog­nize shock hazards and are familiar with the safety precautions re­quired to avoid possible injury. Read and follow all installation,
operation, and maintenance information carefully before using the
product. Refer to the manual for complete product specifications.

If the product is used in a manner not specified, the protection pro­vided by the product may be impaired.

The types of product users are:

Responsible body

and maintenance of equipment, for ensuring that the equipment is
operated within its specifications and operating limits, and for en­suring that operators are adequately trained.

Operators

trained in electrical safety procedures and proper use of the instru­ment. They must be protected from electric shock and contact with
hazardous live circuits.

Maintenance personnel

to keep it operating properly, for example, setting the line voltage
or replacing consumable materials. Maintenance procedures are de­scribed in the manual. The procedures explicitly state if the operator
may perform them. Otherwise, they should be performed only by
service personnel.

Service personnel

safe installations and repairs of products. Only properly trained ser­vice personnel may perform installation and service procedures.

Keithley products are designed for use with electrical signals that
are rated Measurement Category I and Measurement Category II, as
described in the International Electrotechnical Commission (IEC)
Standard IEC 60664. Most measurement, control, and data I/O sig­nals are Measurement Category I and must not be directly connect­ed to mains voltage or to voltage sources with high transient over­voltages. Measurement Category II connections require protection
for high transient over-voltages often associated with local AC
mains connections. Assume all measurement, control, and data I/O
connections are for connection to Category I sources unless other­wise marked or described in the Manual.

Exercise extreme caution when a shock hazard is present. Lethal
voltage may be present on cable connector jacks or test fixtures. The
American National Standards Institute (ANSI) states that a shock
hazard exists when voltage levels greater than 30V RMS, 42.4V
peak, or 60VDC are present.

that hazardous voltage is present in any unknown circuit before
measuring.

is the individual or group responsible for the use

use the product for its intended function. They must be

perform routine procedures on the product

are trained to work on live circuits, and perform

A good safety practice is to expect

Operators of this product must be protected from electric shock at
all times. The responsible body must ensure that operators are pre­vented access and/or insulated from every connection point. In
some cases, connections must be exposed to potential human con­tact. Product operators in these circumstances must be trained to
protect themselves from the risk of electric shock. If the circuit is
capable of operating at or above 1000 volts,

the circuit may be exposed.

Do not connect switching cards directly to unlimited power circuits.
They are intended to be used with impedance limited sources.
NEVER connect switching cards directly to AC mains. When con­necting sources to switching cards, install protective devices to lim­it fault current and voltage to the card.

Before operating an instrument, make sure the line cord is connect­ed to a properly grounded power receptacle. Inspect the connecting
cables, test leads, and jumpers for possible wear, cracks, or breaks
before each use.

When installing equipment where access to the main power cord is
restricted, such as rack mounting, a separate main input power dis­connect device must be provided, in close proximity to the equip­ment and within easy reach of the operator.

For maximum safety, do not touch the product, test cables, or any
other instruments while power is applied to the circuit under test.
ALWAYS remove power from the entire test system and discharge
any capacitors before: connecting or disconnecting cables or jump­ers, installing or removing switching cards, or making internal
changes, such as installing or removing jumpers.

Do not touch any object that could provide a current path to the com­mon side of the circuit under test or power line (earth) ground. Always
make measurements with dry hands while standing on a dry, insulated
surface capable of withstanding the voltage being measured.

The instrument and accessories must be used in accordance with its
specifications and operating instructions or the safety of the equip­ment may be impaired.

Do not exceed the maximum signal levels of the instruments and ac­cessories, as defined in the specifications and operating informa­tion, and as shown on the instrument or test fixture panels, or
switching card.

When fuses are used in a product, replace with same type and rating
for continued protection against fire hazard.

Chassis connections must only be used as shield connections for
measuring circuits, NOT as safety earth ground connections.

If you are using a test fixture, keep the lid closed while power is ap­plied to the device under test. Safe operation requires the use of a
lid interlock.

no conductive part of

5/03

If a screw is present, connect it to safety earth ground using the
wire recommended in the user documentation.

!

The symbol on an instrument indicates that the user should re­fer to the operating instructions located in the manual.

The symbol on an instrument shows that it can source or mea­sure 1000 volts or more, including the combined effect of normal
and common mode voltages. Use standard safety precautions to
avoid personal contact with these voltages.

The symbol indicates a connection terminal to the equipment
frame.

The

WARNING

result in personal injury or death. Always read the associated infor­mation very carefully before performing the indicated procedure.

The

CAUTION

damage the instrument. Such damage may invalidate the warranty.

Instrumentation and accessories shall not be connected to humans.

Before performing any maintenance, disconnect the line cord and
all test cables.

heading in a manual explains dangers that might

heading in a manual explains hazards that could

To maintain protection from electric shock and fire, replacement
components in mains circuits, including the power transformer, test
leads, and input jacks, must be purchased from Keithley Instru­ments. Standard fuses, with applicable national safety approvals,
may be used if the rating and type are the same. Other components
that are not safety related may be purchased from other suppliers as
long as they are equivalent to the original component. (Note that se­lected parts should be purchased only through Keithley Instruments
to maintain accuracy and functionality of the product.) If you are
unsure about the applicability of a replacement component, call a
Keithley Instruments office for information.

To clean an instrument, use a damp cloth or mild, water based
cleaner. Clean the exterior of the instrument only. Do not apply
cleaner directly to the instrument or allow liquids to enter or spill
on the instrument. Products that consist of a circuit board with no
case or chassis (e.g., data acquisition board for installation into a
computer) should never require cleaning if handled according to in­structions. If the board becomes contaminated and operation is af­fected, the board should be returned to the factory for proper
cleaning/servicing.

Keithley Instruments, Inc.

28775 Aurora Road
Cleveland, Ohio 44139
[phone]
Fax: [phone]
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 3

Expansion on page 4

• Multiplexer examples on page 4

•4 × 4 Blocking matrix example on page 7

•4 × 4 Non-blocking matrix example on page 8

Wiring procedure on page 10

Operation on page 11

• Channel assignments on page 11

Close/Open channels on page 11

• Multiple channel operation on page 11

S-parameters on page 12

• Unlocking calibration on page 12

• CALibration subsystem on page 13

SYSTem subsystem on page 14

Measurement considerations on page 15

• Termination of unused connectors on page 15

• Power handling on page 15

• Additional measurement uncertainty on page 16

Application example on page 18

Service on page 22

• Performance verification on page 22

• Replaceable parts on page 24

Model 7711/7712

User’s Guide

PA-818 Rev. B / 8-03

Introduction

If you have any questions after reviewing this information, please contact your local Keithley representative or call one of our
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. Refer to the simplified schematic in Figure 1 or the
specifications. The multiplex switching can be used to connect one instrument to multiple devices (1:N) or multiple
instruments to a single device (N:1). This card expands the Integra Series’ general purpose AC switching capability by
providing an RF switching capability above 1MHz. Each card has the following features:

• 10 SMA connectors with 50 Ω impedance

• Frequencies (refer to specifications)
Model 7711 — up to 2 GHz
Model 7712 — up to 3.5 GHz

• Two channels can be closed at one time—one channel to OUT A (channels 1–4) and one to OUT B (channels 5–8)

• Designed specifically for use with the Integra Series including Keithley’s Models 2700, 2701 and 2750 Multimeter
/ Data Acquisition Systems

NOTE All references to the Model 27xx apply to the Models 2700, 2701, and 2750.

With this in mind, the capability of the Model 27xx is expanded for applications such as the following:

• General AC and digital signal routing to and from test equipment. This includes oscilloscopes, function generators,
pulse generators, counter/timers, and signal analysis tools including network and jitter analyzers. Also, this includes
diverse applications that require RF and digital routing plus DC measurements for research, development, burn-in
and production testing, AC ripple and noise test for switching power supplies, and DC-DC converters.

• Research, development, and burn-in of temperature compensated oscillators.

• Research, development, and production test of communications or networking products including Ethernet, DSL,
DS3, T1/E1, etc.

WARNING Before operating the Model 27xx with an accessory card, verify that the card is properly

installed and the mounting screws are tightly fastened. If the mounting screws are not
properly connected, an electrical shock hazard may be present.

Available accessories

Model 7711 only

7711-BNC-SMA Male SMA to Female BNC, five 0.15m (0.5ft) cables

(Insertion loss < 1dB@1GHz, VSWR < 1.5@ 1GHz)
7051-2 BNC cable, male to male, 0.6m (2ft.)
7051-5 BNC cable, male to male, 1.5m (5ft.)
7051-10 BNC cable, male to male, 3.0m (10ft.)

2

Model 7711/7712

7712-SMA-1 SMA cable, male to male, flexible, low loss, 1m (3.3ft)

(Insertion loss < 0.65dB @ 2GHz, VSWR < 1.11 @2GHz)
7712-SMA-N 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 (0.5ft)

Card configuration—schematic

Figure 1 shows a simplified schematic diagram of the Model 7711/7712 module. As shown, the Model 7711/7712 has channels

that are grouped into dual 1 × 4 multiplexers. The multiplexer’s design allows 1 channel of each set of 4 to be closed at a time
(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).

Figure 1

Simplified schematic for Model 7711/7712

Ch1

Ch2

OUT A

Ch3

Ch4

Ch5

Ch6

OUT B

Ch7

Ch8

NOTE To close channels 1 and 5 on a Model 7711/7712 in slot 1, send: :ROUT:MULT:CLOS

(@101,105)

The channels are controlled over the bus or from the front panel. The grounds for these channels are non-isolated. Detailed
connection information is contained later in this guide. By using the ROUT:MULT commands (refer to Section 2 of the
Model 27xx User’s Manual), they can be manually configured.

3

Expansion

One Model 7711/7712 configuration is a dual (2 bank) 1 × 4 multiplexer. A single Model 7711/7712 module can also be
configured as a 4 × 4 blocking matrix. The 7711/7712 can be combined with additional modules to further expand its
multiplexing and matrix switching capabilities (specifications may degrade when the Model 7711/7712 is used in multiple
module configurations). Refer to Table 1 for possible expansion information. Examples of multiplexer and blocking matrix
expansion follow Table 1.

Table 1

Matrix and multiplex expansion

Multiplexer Blocking Matrix

Number of 7711/7712 Cards 1 ××

1X X

2 XXX XX

3 XXXX X* XXX

*Using four cards in a Model 2750, a 4 × 4 non-blocking matrix can be created (see the 4 × 4 non-blocking matrix example on page 9).

NOTE The commands in this section are formatted as follows: Command (@Model 27xx Slot #,

Channel #)

××

41 ××

××

81 ××

××

12 1 ××

××

16 4 ××

××

44 ××

××

84 ××

××

12 4 ××

××

16

Multiplexer examples

NOTE To minimize noise within the system, terminate unused channels with 50

not available, terminating unused connectors with a cable may also reduce noise within the
system.

Figure 2 shows how to create a 1 × 8 SP8T MUX (single-pole eight-throw multiplex) using two Model 7711 cards. Channels 1

and 2 are connected to OUT A and OUT B of the second card in slot two. Terminate unused channels (in the example, channels
3 and 4 on the Model 7712 in slot one) with a 50 Ω load.

Figure 3 shows how to create a 1 × 12 MUX using two Model 7711 cards.

Ω

loads. If 50

Ω

loads are

NOTE Channels 3 and 4 (of 7711 in slot 1) may also be connected to other banks that will create a 1

multiplexer (or a 1
sample commands needed to operate the 1

NOTE The command “ROUTe:MULTiple:CLOSe (@<channel list>)” closes one channel per bank (two

banks per Model 7711/7712 module), and opens all other channels within the same bank.

4

×

16 multiplexer). See Figure 4 for a 1

×

8 multiplexer.

×

×

12 example. The following is a list of

12

Figure 2

1 x 8 MUX expansion

5

OUT A

7711/7712

Slot 1

>>

7711

CH7 CH1CH2OUT ACH3CH4CH5CH8 CH6OUT B

7711

CH7 CH1CH2OUT ACH3CH4CH5CH8 CH6OUT B

NOTE: The simplified schematic is shown in the

power up state (Channels 1 and 5 are
closed for cards in slots 1 and 2).

Grayed channels are not used in this
1 × 8 SP8T MUX.

S46-SMA-0.5
Cable (Qty 2)

7711/7712
Slot 2

Ch1

Ch2

Ch3

OUT A

>>

Ch4

SLOT 1

SLOT 2

Ch1

Ch2

Ch3

Ch4

Ch5

Ch6

Ch7

Ch8

Ch5

OUT B

>>

Ch6

Ch7

Ch8

To close to this crosspoint (CH7) send:

ROUTe:MULTiple:CLOSe(@102,207)

Figure 3

××

1

××

12 MUX expansion

6

OUT A

>>

7711/7712
Slot 1

7711

CH7 CH1CH2OUT ACH3CH4CH5CH8 CH6OUT B

7711

CH7 CH1CH2OUT ACH3CH4CH5CH8 CH6OUT B

NOTE: The simplified schematic is shown in the

power up state (Channels 1 and 5 are
closed for cards in slots 1 and 2).

Grayed channels are not used in this
1 × 12 SP12T MUX.

Ch1

Ch2

Ch3

Ch4

S46-SMA-0.5
Cable (Qty 3)

OUT A

OUT B

7711/7712
Slot 2

>>

>>

SLOT 1

SLOT 2

To close to this crosspoint (CH3) send:

ROUTe:MULTiple:CLOSe(@101,203)

Ch1

Ch2

Ch3

Ch4

To close to this crosspoint (CH7) send:

ROUTe:MULTiple:CLOSe(@102,207)

Ch5

Ch6

Ch7

Ch8

Terminate this
unused channel
in bank 1 with a 50Ω
load or an unconnected
S46-SMA-0.5 cable.

NOTE: Channels 5-8 on the 7711/7712

in slot 1 correspond to crosspoints
Channels 9-12 of the 1 × 12 SP12T
MUX.

OUT B

>>

Ch5 (Ch9)

Ch6 (Ch10)

Ch7 (Ch11)

Ch8 (Ch12)

To close to this crosspoint (CH11) send:

ROUTe:MULTiple:CLOSe(@103,107)

4

××

××

4 Blocking matrix example

Figure 4 shows how to connect a single Model 7711 in a 4 × 4 blocking matrix. This configuration provides a convenient way

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 – 6). Use a short coaxial cable to connect OUT A to OUT B (S46-SMA-0.5). con­tains example commands.

Figure 4

××

4

4 blocking matrix expansion

××

7711

CH7 CH1CH2OUT ACH3CH4CH5CH8 CH6OUT B

S46-SMA-0.5
Cable (Qty 1)

7711/7712
Slot 1

Ch1

Ch2

Ch3

Ch4

OUT A

OUT B

Ch5

Ch6

Ch7

Ch8

To route the signal between Ch4 and Ch8 send:

ROUTe:MULTiple:CLOSe(@104,108)

NOTE: The simplified schematic is shown in the

power up state (Channels 1 and 5
closed).

Table 2

××

4

××

4 Blocking matrix commands

Command Signal path

ROUTe:MULTiple:CLOSe (@101,105) Routes signal through channels 1 and 5

ROUTe:MULTiple:CLOSe (@103,106) Routes signal through channels 3 and 6

7

4 x 4 Non-blocking matrix example

Using a Model 2750 and four Model 7711/7712 cards, a 4 × 4 non-blocking matrix can be created. Figure 5 shows how to
connect the 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.

To use , select the IN connection (IN 1 – IN 4), and then in the same square select the OUT connection (OUT1 - OUT4). Send
the

ROUTe:MULTiple:CLOSe command with the channels in both “Ch” columns.

Table 3

××

4 Sample non-blocking matrix commands

4

××

Command Signal path

ROUTe:MULTiple:CLOSe (@101,405) Routes signal from IN1(OUT A of slot 1) through

OUT4 (OUT B of slot 4).

ROUTe:MULTiple:CLOSe (@101,405,108,302) Routes signal from IN1 (OUT A of slot 1) through

OUT4 (OUT B of slot 4), and also from IN2 (OUT B
of slot 1) through OUT1 (OUT A of slot 4).

Table 4

××

4

××

4 Non-blocking matrix channels

IN Ch Ch OUT IN Ch Ch OUT

IN 1 101 405 OUT4 IN 3 201 407 OUT4

102 401 OUT3 202 403 OUT3

103 305 OUT2 203 307 OUT2

104 301 OUT1 204 303 OUT1

IN Ch Ch OUT IN Ch Ch OUT

IN 2 105 406 OUT4 IN 4 205 408 OUT4

106 402 OUT3 206 404 OUT3

107 306 OUT2 207 308 OUT2

108 302 OUT1 208 304 OUT1

8

Figure 5

4 x 4 Non-blocking matrix expansion

7711

9

7711

CH7 CH1CH2OUT ACH3CH4CH5CH8 CH6OUT B

7711

CH7 CH1CH2OUT ACH3CH4CH5CH8 CH6OUT B

IN1

OUT A OUT B

SLOT 1 SLOT 2

1

2 3 4 5

SLOT 1
SLOT 2

IN2

7 8Channel 1 2 3 4 5

6

IN3

OUT A OUT B

CH7 CH1CH2OUT ACH3CH4CH5CH8 CH6OUT B

CH7 CH1CH2OUT ACH3CH4CH5CH8 CH6OUT B

IN4

6

7 8

SLOT 3

7711

NOTE: The simplified schematic

is shown in the power
up state (Channels 1
and 5 closed for cards
in all slots).

Channel

1

2

3

SLOT 3

4

5

6

7

8

1

2

3

SLOT 4

4

5

6

7

8

SLOT 4

OUT A OUT B OUT A OUT B

OUT1

OUT2

OUT3

OUT4

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. If using a saved setup that calls for another channel to be closed, the card will be switched to that
channel but only after the firmware has finished "waking up." Therefore, the lowest channel will ALWAYS be closed for at
least a brief time at power-up. The user needs to verify that nothing is connected to the lowest channel in each bank that could
be damaged.

The connectors on the card are standard SMA type connectors. When making or breaking connections, use a torque wrench to
produce mating torque of 0.9 N•m (8in•lbs).

NOTE Use a box-spanner torque wrench similar to Suhner Type 74 Z-1-0-21, Identification number

543130. This wrench is for SMA connectors with a 1.00 N•m torque with 8.0mm (0.315 in.) across
the flats.

Figure 6

Model 7711/7712 channel connections

7711

CH7 CH1CH2OUT ACH3CH4CH5CH8 CH6OUT B

WARNING Do not touch live RF (radio frequency) conductors, even at low voltages! RF behaves

differently than DC or low frequency AC. Low voltage RF can cause severe burns. RF
signals spread out over body areas generating substantial currents at the points of
contact with RF conductors.

Make all connections using correct wire size. If BNC connections are required, use the SMA to BNC adapter cables (see

Available accessories on page 2).

Specifications

Full Model 7711/7712 specifications are included at the end of this User Guide.

10

Operation

NOTE The Model 7711/7712 modules cannot be included in scanlists.

Detailed information to close and open switching module channels is provided in Section 2 of the Model 27xx User’s Manual.
The following summarizes basic operation and provides operating information specific to the Model 7711/7712.

Channel assignments

NOTE Measurement functions cannot be assigned to Model 7711/7712 modules. For example, if a

Model 7711/7712 is installed in slot 1 and the SENSE:FUNC ‘VOLT:AC’, (@101) command is
sent, a -221, “Settings Conflict” error would be reported.

The Model 2700/2701 has two slots for switching modules, and the Model 2750 has five slots. To control the appropriate
switching module, the slot number must be included with the switching module channel number when you specify a channel.
The channel assignment is formatted as follows:

SCH where: S is the slot number

CH is the channel number

Examples:
101 = Slot 1, Channel 1
210 = Slot 2, Channel 10
506 = Slot 5, Channel 6 (Model 2750)

NOTE For remote operation, the 3-digit channel assignment is included in the channel list parameter for

the commands.

Close/Open channels

Multiple channel operation

WARNING Multiple channel operation should only be performed by experienced test engineers who

recognize the dangers associated with multiple channel closures.

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 – 8 for each module. When you close two channels in a single module
(one for OUT A and one for OUT B), the appropriate channels will close channels outside of the banks (or on other modules)
are not affected by channel closures.

The following paragraphs summarize multiple channel operation for the front panel and from the remote interface (bus).

Front panel

• For the Models 2700/2701 and 2750, the MULTI option of the CLOSE key can be used to close a channel.

• For the Models 2700/2701 and 2750, the ALL option of the OPEN key closes channels 1 and 5 to OUT A and OUT
B respectively.

11

Remote interface

ROUT:MULT:CLOS <clist>
ROUT:MULT:CLOS?
ROUT:MULT:CLOS:STAT? <clist>
ROUT:OPEN:ALL

The following command is not available:

ROUT:MULT:OPEN <clist>

NOTE For example, if a Model 7711/7712 is installed in slot 1 and the ROUT:MULT:OPEN (@101) com-

— Closes channels 1 and 5 to OUT A and OUT B respectively

mand is sent, a -221, “Settings Conflict” error would be reported.

— Closes specified channels (unlisted channels not affected unless in the same bank).

— Returns list of all closed channels.

— Query closed channels in list (1 = closed).

— Invalid command for the Model 7711/7712 module.

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.

Remember to use multiple channel operation to control the 7711/7712 module and system channel operation to control a
measure card for DMM measurements. If you attempt to close a 7711/7712 module channel using front panel system channel
operation, the message “NO MEAS CARD” will be displayed briefly.

If you use front panel inputs for measurements, make sure that the front panel INPUT switch is in the out (F) position.

S-parameters

S-parameters allow a text string of up to 238 ASCII characters to be stored on a module. This can be used for system
calibration of cable and module losses. The calibration text string is stored on the module, independent of the Model 27xx
mainframe.

Unlocking calibration

Use the following sequence of commands to unlock calibration (factory default code):

CAL:PROT:CODE “KI0027xx”
CAL:PROT:CARD1:INIT

CAL:PROT:CARD1:SPAR “......”

CAL:PROT:CARD1:SAVE

where: xx = 00 (for 2700)

xx

= 01 (for 2701)
= 50 (for 2750)

xx

NOTE

Your mainframe calibration unlock code will remain the factory default code unless it is changed.

12

CALibration subsystem

Commands to perform output operations are listed in Table 5. Details on these commands follow the table.

NOTE

The following commands for the CALibration subsystem are specific to the Model 7711/7712
module. It is only available if a Model 7711/7712 is installed.

Table 5

CALibration subsystem commands

Command Description Default

2700/2701 Commands

CALibration

:PROTected

:CARD1 Path to CARD1 commands.

:INITiate Initiate command—required before sending s-parameters.

:SPARameters <string> Enter up to 238 characters for storage of S-parameter information about

the card in slot 1.

:SPARameters? Query the ASCII information for CARD1.

:CARD2 Path to CARD2 commands.

:SPARameters? Query the ASCII information for CARD2.

2750 Commands (only)

CALibration

:CARD1 Path to CARD commands.

:INITiate Initiate command—required before sending s-parameters.

:SPARameters <string> Enter up to 238 characters for storage of S-parameter information about

the card in slot 1.

:CARD Path to s-parameter queries.

:SPARameters? <NRf> Query the ASCII information for card in slot <NRf>.

Empty

Empty

: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.

NOTE

S-parameter data can only be

written

to a card in slot 1. The S-parameters are treated like
card-cal constants, meaning that you must send a CAL:PROT:CARD1:INIT command before
sending the SPARameters, and they are only saved on the card after a CAL:PROT:CARD1:SAVE
command. The S-parameter can be

:SPARameters? <NRf> Query S-parameter

read

from any slot.

S-parameter data can only be written to a card in slot 1. This is consistent with other Integra series type card calibrations that
are allowed in slot 1 only. Also, the Model 2750 can be queried using CAL:PROT:CARD1:SPAR

NOTE

Errors +518 and +519 are provided to flag corrupted S-parameter information or flag
S-parameter information that was not properly initialized.

13

SYSTem subsystem

Commands to perform system operations are listed in Table 6. Details on these commands follow the table.

NOTE The following commands for the Model 7711/7712 SYSTem subsystem are included here for

reference.

Table 6

SYSTem subsystem commands

Command Description Default

2700/2701 Commands

:SYSTem

:CARD1 Path to queries for slot 1 card.

:CARD2 Path to queries for slot 2 card.

:SNUMber? Request serial number of card in Slot x.

:SWRevision? Request firmware revision of card in Slot x.

:VMAX? Query the highest allowed voltage on this card.

:MUX? Return TRUE if this card support ANY mux channels.

:SNOpen? Query whether the card is of the "single, no-open" type.

:BANKs? This query returns the number of banks on the card. If the card is not of the

Single, No-Open type, then a -221 "Settings Conflict" error results with
this query.

2750 Commands (only)

:CARD Path to queries (slot is designated by <NRf> after query command).

:SNUMber? <NRf> Request serial number of card in Slot x.

:SWRevision? <NRf> Request firmware revision of card in Slot x.

:VMAX? <NRf> Query the highest allowed voltage on this card.

:MUX? <NRf> Return TRUE if this card support ANY mux channels.

:SNOpen? <NRf> Query whether the card is of the "single, no-open" type.

:BANKs? <NRf> This query returns the number of banks on the card. If the card is not of the

Single, No-Open type, then a -221 "Settings Conflict" error results with
this query.

:CARD1 Model 2700/2701 commands
:CARD2

If no card is in slot 1, then all commands in Table 6 generate a -241 “hardware missing” error. If the card does not support the
feature or channels being queried, then 0 will be returned.

:MUX?

Returns either a 1 or 0. (For a Model 7711/7712 card, a 0 is returned.)

:SNOpen?

"single, no-open" type — The card is organized into banks of channels, and one channel must always be closed within that

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.)

14

:CARD Model 2750 commands only

If no card is in slot <NRf>, then all of these commands will generate a -241 “hardware missing” error. If the card does not
support the feature or channels being queried, then 0 will be returned.

Unlike the Model 2700/2702, the Model 2750 SYST:CARD queries have the slot passed as a <NRf> following the query
(rather than incorporated into the command name). For compatibility with existing Model 2700/2702 software, the
Model 2750 also accepts SYST:CARD1 or SYST:CARD2 (not recommended for queries when developing new software).

Example: To query the maximum voltage allowed on the card in slot 3, send:

:SYST:CARD:VMAX? 3

Measurement considerations

Termination of unused connectors

To minimize noise within the system, terminate unused channels with 50Ω loads. If 50Ω loads are not available, terminating
unused connectors with a cable may also reduce noise within the system.

Power handling

The graph in Figure 7 shows the maximum amount of power per channel that can be routed using the Model 7711 or
Model 7712 while maintaining proper digital multimeter accuracy. Power levels of up to 10 watts at frequencies > 200MHz
can be used, but this may cause measurement errors. For example, routing 10 watts of power at 1GHz may cause the
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.

Figure 7

Carry power (per channel) vs. frequency

12

10

8

6

4

Power (watts)

2

0

10 100 1000

200MHz

Additional DMM Uncertainty

500MHz

3500

MHz

15

Additional measurement uncertainty

Table 7 lists additional uncertainty to the published specifications for the Model 7708. Other modules, such as the Model 7700

(which measures thermocouple temperature), are also affected by this heat but are still within published specification. The
amount of uncertainty is dependent on:

• Model 7711/7712 slot location

• The amount of time the channel is programmed as an output

• Which other model 77XX module(s) are being used

The listed uncertainty in Table 7 is listed for channels 4 and 8 closed. The uncertainty is linear—for each channel programmed
as input or off, there will be approximately 25 percent reduction in the listed on uncertainty. Table 8 lists the percentage of
additional uncertainty for specific channel pairs closed.

Table 7

Additional uncertainty for Model 7711/7712

Thermocouple Range 7708

J -200 to 0˚C

0 to +768˚C

K -200 to 0˚C

0.4

0 to +1372˚C

N -200 to 0˚C

0 to +1300˚C

T -200 to 0˚C

0.75

0.15

0.4

0 to +400˚C

E -200 to 0˚C

0.15

0 to +1000˚C

R 0 to +400˚C

1.5

0 to +1768˚C

S 0 to +400˚C

1.5

0 to +1768˚C

B 350 to 1100˚C

0 to +1820˚C

Notes:

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.
For example: Model 2700/2701: 7711/7712 in slot 1, 7708 in slot 2

Model 2750: 7711/7112 in slot 2, 7708 in slot 3

2.4

0.6

16

Table 8

Percent of additional uncertainty

Percent of additional

Channels closed

uncertainty (from Table 7)

4 and 8
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
1 and 6
1 and 7
2 and 5
2 and 6
1 and 5

100%

75%
75%
75%
75%
50%
50%
50%
50%
50%
50%
25%
25%
25%
25%

0%

17

Application example

The following application example is for power supply testing. For basic overview and switching, refer to Figure 8. For the
tests performed, refer to the provided code (Figure 9). Basic knowledge for Visual Basic functions, such as the CStr() function,
as well as how forms work in Visual Basic, is required to fully understand the example.

Figure 8

Simplified connection schematic (one power supply shown)

Oscilloscope

OUT A

Ch1

7711-SMA-BNC

7711

Cable

Thermocouple

Power Supply

Input Output

HI

LO

7712-SMA-1
Cable

Ch2

Ch4

Ch1

Ch3

HI

LO

HI

LO

DCV

CONT

10%
Load

7705
Ch21

90%

Load

7705
Ch31

High Line

132V

~ ~

7705
Ch1

7705
Ch11

Low Line

108V

ACV

TEMP

HI

LO

HI

LO

7700

Figure 9

Visual basic application example—power supply testing

'' --------------------------------------------------------------------------------------------------------------------­'' 7711 Application Example
'' --------------------------------------------------------------------------------------------------------------------­'' This program tests a set of power supplies using a 2750 loaded with a 7700,
'' 7711, and a 7705.
''
'' The following occurs:
'' 1) The 7700 takes DCV, ACV, 2W OHMS (CONT), and TEMP measurements.
'' 2) Limits are used in each of the measurements by the 7700.
'' A) DCV limits are set to 10% of the power supply's output.
'' B) ACV limits are 108 and 132V.
'' C) 2W OHMS limits are -0.01 and 2 ohms.
'' D) 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).
''
'' Please note:
'' The maximum number of power supplies that can be used with this example is 4.
'' ---------------------------------------------------------------------------------------------------------------------

18

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.
Const ADDRESS = 16 ' DMM setup address.

'' Slot assignments.
Const SLOT_7700 = 1
Const SLOT_7711 = 2
Const SLOT_7705 = 3

'' Number of configurations, power supply units, and functions.
Const NUMBER_OF_DUTS = 4
Const NUMBER_OF_FUNCTIONS = 4 ' DCV, ACV, CONT, and TEMP.
Const NUMBER_OF_SUPPLY_CONFIGURATIONS = 4 ' Includes HIGH/ LOW line and 10%/90% load.
Const N_READINGS = NUMBER_OF_DUTS * NUMBER_OF_FUNCTIONS * NUMBER_OF_SUPPLY_CONFIGURATIONS

'' Constants to define limits for the different measurements.
Const POWER_SUPPLY_VOLTAGE = 5 ' Voltage output of power supplies.
Const DCV_MAX = POWER_SUPPLY_VOLTAGE * 1.1 ' Allow power supply to vary by 10%.
Const DCV_MIN = POWER_SUPPLY_VOLTAGE * 0.9
Const ACV_MAX = 132 ' ACV input voltage to power supply limits.
Const ACV_MIN = 108
Const CONT_MAX = 2 ' Limit failure will occur at 2 ohms or more.
Const CONT_MIN = -0.01
Const TEMP_MAX = 125 ' Max. and min. limits for temperature.
Const TEMP_MIN = 70

'' Constants to define power supply configurations.
Const HIGH_LINE = 1
Const LOW_LINE = 2
Const TEN_PERCENT_LOAD = 1
Const NINETY_PERCENT_LOAD = 2

' Global variables.
Dim Status As Integer ' Variable used by the send() function.
Dim Readings(N_READINGS) As String ' Array to store readings.
Dim Reading_Counter As Integer ' Index to Readings().

'' --------------------------------------------------------------------------------------------------------------------­'' 7700 Channel Configurations
'' --------------------------------------------------------------------------------------------------------------------­'' Configure_Limits(,,) ­'' Sets the limits for a given channel given by the constants defined above.
''
'' Configure_7700_DCV(,) ­'' Sets a channel to measure DCV.
''
'' Configure_7700_ACV() ­'' Configures a channel to measure ACV.
''
'' Cofigure_CONT() ­'' Configures the channel to measure 2W ohms.
'' This measurement is used instead of CONT, so we can select the ohm's limits.
''
'' Configure_7700_TEMP() ­'' Sets a channel to measure temperature using *RST default.
''
'' Configure_Channel() ­'' Uses the above functions to do the following on the 7700:
'' 1. Sets channels 1,5,9, and 13 to DCV.
'' 2. Sets channels 2,6,10, and 14 to ACV.
'' 3. Sets channels 3,7,11, and 15 to CONT.
'' 4. Sets channels 4,8,12, and 16 to TEMP.
'' 5. Places the box into Auto-Configuration Mode.
''
'' Note: Auto-configuration mode brings in the individual channels'
'' settings when that channel is closed.
'' --------------------------------------------------------------------------------------------------------------------­Private Sub Configure_7700_Limits(Channel_Num As Integer, Ulimit As Integer, Llimit As Integer)
Dim Channel_Str As String
Dim Upper_Limit As String
Dim Lower_Limit As String

Channel_Str = ",(@" & CStr(Channel_Num) & ")" ' Converts a number to an ASCII channel parameter.
Upper_Limit = CStr(Ulimit)
Lower_Limit = CStr(Llimit)

Call send(ADDRESS, "CALC3:LIM1:STAT ON" & Channel_Str, Status) ' Enable Limit1 for DCV.
Call send(ADDRESS, "CALC3:LIM1:UPP:DATA " & Upper_Limit & Channel_Str, Status) ' Set upper limit.
Call send(ADDRESS, "CALC3:LIM1:LOW:DATA " & Lower_Limit & Channel_Str, Status) ' Set lower limit.
End Sub

Private Sub Configure_7700_DCV(Channel_Num As Integer, Power_Supply_DCV As Integer)
Dim Channel_Str As String

Channel_Str = ",(@" & CStr(Channel_Num) & ")"
Call send(ADDRESS, "SENS:FUNC 'VOLT:DC'" & Channel_Str, Status) ' Set channel to measure DCV.
Call send(ADDRESS, "SENS:VOLT:DC:RANG 100" & Channel_Str, Status) ' Set voltage range(Power Supply is at 5V).

Call Configure_7700_Limits(Channel_Num, DCV_MAX, DCV_MIN)
End Sub

Private Sub Configure_7700_ACV(Channel_Num As Integer)
Dim Channel_Str As String

Channel_Str = ",(@" & CStr(Channel_Num) & ")"
Call send(ADDRESS, "SENS:FUNC 'VOLT:AC'" & Channel_Str, Status) ' Set channel to measure ACV.
Call send(ADDRESS, "SENS:VOLT:AC:RANG 150" & Channel_Str, Status) ' Set voltage range.
Call Configure_7700_Limits(Channel_Num, ACV_MAX, ACV_MIN)
End Sub

19

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" & Channel_Str, Status) ' Set meaurement speed to fast.

Call Configure_7700_Limits(Channel_Num, CONT_MAX, CONT_MIN)
End Sub

Private Sub Configure_7700_TEMP(Channel_Num As Integer)
Dim Channel_Str As String

Channel_Str = ",(@" & CStr(Channel_Num) & ")"
Call send(ADDRESS, "SENS:FUNC 'TEMP'" & Channel_Str, Status) ' Set channel to TEMP measurement.
Call send(ADDRESS, "SENS:TEMP:TRAN TC" & Channel_Str, Status) ' Select thermocouple measurement.
Call send(ADDRESS, "SENS:TEMP:TC:TYPE T" & Channel_Str, Status) ' Use T thermocouples.
Call send(ADDRESS, "SENS:TEMP:TC:RJUN:RSEL INT" & Channel_Str, Status) ' Use internal reference junction.

Call Configure_7700_Limits(Channel_Num, TEMP_MAX, TEMP_MIN)
End Sub

Private Sub Configure_7700_Channels()
Dim I As Integer
Dim POWER_SUPPLY_VOLTAGE As Integer

For I = 0 To NUMBER_OF_DUTS - 1
Call Configure_7700_DCV(1 + (I * NUMBER_OF_DUTS) + (SLOT_7700 * 100), POWER_SUPPLY_VOLTAGE)
Call Configure_7700_ACV(2 + (I * NUMBER_OF_DUTS) + (SLOT_7700 * 100))
Call Configure_7700_CONT(3 + (I * NUMBER_OF_DUTS) + (SLOT_7700 * 100))
Call Configure_7700_TEMP(4 + (I * NUMBER_OF_DUTS) + (SLOT_7700 * 100))
Next

Call send(ADDRESS, "ROUT:CLOS:ACON ON", Status) ' Place instrument in auto-configure mode.
End Sub
'' --------------------------------------------------------------------------------------------------------------------­'' 7705 Configurations
'' --------------------------------------------------------------------------------------------------------------------­'' Configure_Power_Supplies(,) ­'' Uses the 7705 switch card to change the input voltage to the power supplies.
'' They may run at either high line or low line. A load of 10% or 90% is also
'' selected in this function.
''
'' Assume the following for the 7705:
'' 1) Channels 1 to 4 connect each of the possible DUTS to HIGH LINE.
'' 2) Channels 11 to 14 connect each of the possible DUTS to LOW LINE.
'' 3) Channels 21 to 24 connect each of the possible DUTS to 10% load.
'' 4) Channels 31 to 34 connect each of the possible DUTS to 90% load.
'' --------------------------------------------------------------------------------------------------------------------­Private Sub Configure_Power_Supplies(Line As Integer, Load As Integer)
Dim Min_Channel, Max_Channel As String

' Insert code here to turn off power supply outputs.

Min_Channel = CStr((SLOT_7705 * 100) + 1)
Max_Channel = CStr((SLOT_7705 * 100) + 40)
Call send(ADDRESS, "ROUT:MULT:OPEN (@" & Min_Channel & ":" & Max_Channel & ")", Status) ' Open all 7705 channels.

Select Case (Line)
Case HIGH_LINE
Min_Channel = CStr((SLOT_7705 * 100) + 1)
Max_Channel = CStr((SLOT_7705 * 100) + NUMBER_OF_DUTS)
Call send(ADDRESS, "ROUT:MULT:CLOS (@" & Min_Channel & ":" & Max_Channel & ")", Status)

Case LOW_LINE
Min_Channel = CStr((SLOT_7705 * 100) + 1 + 10)
Max_Channel = CStr((SLOT_7705 * 100) + NUMBER_OF_DUTS + 10)
Call send(ADDRESS, "ROUT:MULT:CLOS (@" & Min_Channel & ":" & Max_Channel & ")", Status)
End Select

Select Case (Load)
Case TEN_PERCENT_LOAD
Min_Channel = CStr((SLOT_7705 * 100) + 1 + 20)
Max_Channel = CStr((SLOT_7705 * 100) + NUMBER_OF_DUTS + 20)
Call send(ADDRESS, "ROUT:MULT:CLOS (@" & Min_Channel & ":" & Max_Channel & ")", Status)

Case NINETY_PERCENT_LOAD
Min_Channel = CStr((SLOT_7705 * 100) + 1 + 30)
Max_Channel = CStr((SLOT_7705 * 100) + NUMBER_OF_DUTS + 30)
Call send(ADDRESS, "ROUT:MULT:CLOS (@" & Min_Channel & ":" & Max_Channel & ")", Status)
End Select

' Insert code here to configure and/ or turn on power supply outputs.
End Sub

'' --------------------------------------------------------------------------------------------------------------------­'' Measurement Functions
'' --------------------------------------------------------------------------------------------------------------------­'' Take_Measurements() ­'' Closes the appropriate channels and takes a measurement using READ? command.
'' ---------------------------------------------------------------------------------------------------------------------

20

Private Sub Take_Measurements()
Dim I, J As Integer
Dim Channel_Num As Integer
Dim Channel_Str As String
Dim Reading As String

For I = 1 To NUMBER_OF_DUTS ' Loop to take measurements for all DUTs.
Channel_Num = (SLOT_7711 * 100) + I ' Determine channel number.
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.
Channel_Num = (SLOT_7700 * 100) + J + ((I - 1) * NUMBER_OF_DUTS)
Channel_Str = "(@" & CStr(Channel_Num) & ")"
Call send(ADDRESS, "ROUT:CLOS " & Channel_Str, Status) ' Close measurement channel on the 7700.
Call send(ADDRESS, "READ?", Status) ' Take measurement.
Call enter(Reading, MAXLEN, LENGTH, ADDRESS, Status)

Readings(Reading_Counter) = Reading ' Store reading.
Reading_Counter = Reading_Counter + 1
Next

' Insert code here to take oscilloscope measurements.
Next
End Sub

'' --------------------------------------------------------------------------------------------------------------------­'' Main Function
'' --------------------------------------------------------------------------------------------------------------------­Private Sub Start_Click()
Reading_Counter = 0 ' Reset index counter.
Call settimeout(ENTER_TIMEOUT) ' Set timeout valuefor enter function.

Call initialize(21, 0) ' Initialize GPIB.

Call send(ADDRESS, "*RST", Status) ' Restore *RST defaults.
Call send(ADDRESS, "INIT:CONT OFF", Status) ' Ensure INIT continuous trigger is off.
Call send(ADDRESS, "FORM:ELEM READ,UNIT", Status) ' Display only reading and units.

Call Configure_7700_Channels ' Setup measurement channels on 7700.
Call Configure_Power_Supplies(HIGH_LINE, TEN_PERCENT_LOAD) ' DUT input voltage is high line and 10% load.
Call Take_Measurements
Call Configure_Power_Supplies(HIGH_LINE, NINETY_PERCENT_LOAD) ' DUT input voltage is high line and 90% load.
Call Take_Measurements
Call Configure_Power_Supplies(LOW_LINE, TEN_PERCENT_LOAD) ' DUT input voltage is low line and 10% load.
Call Take_Measurements
Call Configure_Power_Supplies(LOW_LINE, NINETY_PERCENT_LOAD) ' DUT input voltage is low line and 90% load.
Call Take_Measurements
End Sub

21

Service

WARNING All service information is intended only for qualified service personnel. Do not attempt

to service the Model 7711/7712 unless you are qualified to do so.

Performance verification

The following tests are used to verify the RF characteristics of the Model 7711/7712 card. S-parameters are obtained by
measuring VSWR and insertion loss among the common output and channel. The following equipment is recommended for
the tests in this section:

1. Agilent HP 8753ES Network Analyzer (6GHz) with options 6 and 10.

2. 50Ω 3.5MM test port cables (1m cables).

3. Agilent HP 85033D, 3.5mm Calibration Kit.

4. Phase matched 3.5mm female-female thru-adapter.

Instrument setup

1. Turn on the network analyzer and the mainframe with the Model 7711/7712 installed. Allow the analyzer to warm-up for
at least 1 hour.

2. Calibrate the network analyzer from 100MHz to 3.5GHz using the appropriate calibration kit. The calibration routine
should include a load, short, open, and pass-through procedure. Use SMA style connectors in the calibration process.

VSWR

1. Connect cables as shown in Figure 10.

2. Close channel 1.

3. Select S11 or S22 measurement on the analyzer.

4. Display VSWR graph on network analyzer.

5. Verify specifications.
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.

6. Repeat procedure for remaining channels. Change the network analyzer connection from OUT A to OUT B when verifying
channels 5–8.

22

Figure 10

VSWR and insertion loss verification

Network analyzer

Port 1 Port 2

Model 7711/7712

Ch1

Ch2

OUT A

Ch3

Ch4

Ch5

Ch6

OUT B

Ch7

Ch8

Insertion loss

1. Connect cables as shown in Figure 10.

2. Close channel 1.

3. Select S12 or S21 measurement on the analyzer.

4. Display Log Magnitude plot on the network analyzer.

5. Verify specifications.
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 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
channels 5–8.

23

Cross-talk

1. Connect cables as shown in Figure 11 (Channel 1 to port 1 and channel 2 to port 2, 50Ω load on OUT A).

2. Close channel 1 (all other channels will open).

3. Display Log Magnitude plot on the network analyzer.

4. Select S12 measurement.

5. Verify specifications.
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 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). When verifying cross-talk in the second bank, connect the 50Ω load on
OUT B.

Figure 11

Cross-talk verification

Network analyzer

Port 1 Port 2

Model 7711/7712

Ch1

Ch2

OUT A

50Ω load

Ch3

Ch4

Ch5

Ch6

OUT B

Ch7

Ch8

Replaceable parts

This section contains replacement parts information and the component layout drawing for the Model 7711/7712.

Parts list

Replaceable parts for the Model 7711/7712 are listed in Table 9.

24

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).

• Card serial number.

• Part description.

• Component designation (if applicable).

• Keithley part number.

Factory service

If the instrument is to be returned to Keithley Instruments for repair, perform the

following:

• Call the Repair Department at 1-888-KEITHLEY for a Return Material Authorization (RMA) number.

• Carefully pack the instrument in the original packing carton.

• Write ATTENTION REPAIR DEPARTMENT and the RMA number on the shipping label.

Component layout

The component layout for the Model 7711 is provided in Figure 12. Figure 13 is the Model 7712 component layout.

25

Figure 12

Model 7711 component layout

26

Figure 13

Model 7712 component layout

27

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 C-622-470

CR1,CR2 DIODE MBR5130LT3 RF-115

J100 CONN, RT ANGLE DUAL ROW RECEPT CS-1065-1

J1-J8,J10A,J10B* CONN, RT ANGLE JACK SMA 50 OHM CS-1136

K1-K6: Model 7711 HIGH FREQ RELAY RL-238

Model 7712) RF RELAY RL-268

L1,L2 FERRITE CHIP 600 OHM BLM32A07(1206) CH-62

Q1-Q6 TRANS, NPN SILICON TG-389

R1,R2,R11 RES, 1K, 1%, 100MW, THICK FILM (0805) R-418-1K

R10 RES, 10K, 1%, 100MW, THICK FILM (0805) R-418-10K

R12-R17 RES, 2.55K, 1%, 1W THICK FILM R-418-2.55K

R3-R8 RES, 43.2, 1%, 100MW THICK FILM (0805) R-418-43.2

R9 RES, 357K, 1%, 100MW, THICK FILM(0805) R-418-357K

U1,U2 IC, QUAD 2 IN AND, 74HCT08(SOIC) IC-837

U10 IC, 8 STAGE SHIFT/STORE,MC14094BD(SOIC) IC-772

U3 IC, 2.5V CASCADABLE SERIAL EEPROM LSI-212

U5 IC, +5V VOLTAGE REGULATOR, LM2940CT IC-576

U7 IC, DARLINGTON ARRAY, ULN2003L (SOIC) IC-969

U8 IC, RETRIG., MULTIVIB, 74HC123AM (SOIC) IC-788

U9 IC, HEX SCHMITT INVERT TRIGGER IC-1397

Hardware
Model 7711/7712

Model 7711
Specific hardware

Model 7712
Specific hardware

MODIFIED TOP COVER V-7711-304A

MODIFIED BOTTOM COVER V-7711-303A

STANDOFF MALE-FEMALE ST-166-25

BAR CODE S/N LABEL MC-612A

SERIAL NUMBER LABEL MC-285

4-40 PEM NUT FA-131

MODIFIED TOP COVER 7711-304A

MODIFIED BOTTOM COVER 7711-303A

TOP CARD COVER 7703-302C

4-40X3/16 PHIL. PAN HD SEMS 4-40X3/16PPHSEM

#4-40 X 1/4 LG. PHIL.FLAT HD.SCREW 4-40X1/4PFH

#4-40 X 1/4 LG. PHIL.FLAT HD.SCREW 4-40X1/4PFH

BOTTOM CARD COVER 7703-301B

SCANNER BOARD ASSEMBLY 7711-100B

CONNECTOR BRACKET 7711-301-1A

SCANNER BOARD ASSEMBLY 7712-100A

CONNECTOR BRACKET 7711-301-2A

28

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7711 50ΩΩ 2GHz Multiplexer Specifications

GENERAL

Relay Type: High Frequency Electromechanical
Contact Configuration: Dual 1x4 Multiplexer, single pole four

throw, Channels 1 and 5 are normally closed.

Notes: One channel in each multiplex bank is always closed to

the corresponding OUT connector.

Close Channel: ROUTe:CLOSe allows a single channel in a

multiplex bank to be closed.
ROUTe:MULTiple:CLOSe allows two channels (One in each bank)
to be closed at one time.

Open Channel: ROUTe:OPEN:ALL closes CH1 and CH5 to

OUT A and OUT B respectively.

Actuation Time: <10mS
Firmware: Specified for Model 2700 rev. B04 and

Model 2750 rev. A03 or higher.

Connector Type: Ten External Rear Panel SMA connectors.
Mating Torque: 0.9 N•m (8 in-lb).

INPUTS (CHANNELS 1-8)

Maximum Signal Level: Any channel to any channel or chassis (1-8)

Maximum Power: 20W per module, 10W per channel.*
Safety: Conforms to European Union Directive 73/23/EEC

EN61010-1, CAT I.

EMC: Conforms with European Union Directive 89/336/EEC;

EN61326-1.

Isolation:

Multiplexer to Multiplexer: >1GΩ
Center to Shield: >1GΩ, < 25pF
Channel to Channel: >100MΩ

Contact Life: 1x10
Contact Potential: <6µV
Contact Resistance: <0.5Ω (Initial), <1Ω (End Of Life)
Rise Time: <300ps (Guaranteed by design)
Signal Delay: <3ns

MODEL ACCESSORIES AVAILABLE

7711-SMA-BNC Male SMA to Female BNC

Cables (Five, 0.15m (0.5ft) cables)

7051-2 BNC cable, male to male, 0.6m (2ft.)
7051-5 BNC cable, male to male, 1.5m (5ft.)
7051-10 BNC cable, male to male, 3.0m (10ft.)
7712-SMA-1 SMA cable, male to male, 1.0m (3.3 ft.)
7712-SMA-N 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.

30Vrms (42V peak for AC waveforms) or
60VDC, 0.5A.

6

No Load, 1x105 Rated Load (resistive load)

Frequency (MHz)

Frequency (MHz)

Frequency (MHz)

Page 1

HW 2/05/02

Rev. A

of 2

100MHz

7711 50ΩΩ 2GHz Multiplexer Specifications

AC Performance: (Includes end of life)

For Z

= Z

= 50Ω

source

<<

0.4dB 0.6dB 1.0dB 1.2dB 2.0dB

1.1 1.2 1.2 1.3 1.7

-85dB -65dB -55dB -45dB -35dB

Specifications subject to change without notice.

load

Insertion

Loss

MAX

VSWR

MAX

Ch-Ch

Cross-talk1

MAX

1

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: <0.50Kg (1.1 lb.)

500MHz 1GHz 1.5GHz 2GHz

Page 2

HW 2/05/02

Rev. A

of 2

7712 50ΩΩ 3.53.5GHz Multiplexer

GENERAL

Relay Type: High Frequency Electromechanical
Contact Configuration: Dual 1x4 Multiplexer, single pole four

throw, Channels 1 and 5 are normally closed

Notes: One channel in each multiplex bank is always closed to the

corresponding OUT connector.

Close Channel: ROUTe:CLOSe allows a single channel in a

multiplex bank to be closed.
ROUTe:MULTiple:CLOSe allows two channels (One in each bank)
to be closed at one time.

Open Channel: ROUTe:OPEN:ALL closes CH1 and CH5 to OUT A

and OUT B respectively.

Actuation Time: <10mS
Firmware: Specified for Model 2700 rev. B04 and

Model 2750 rev. A03 or higher.

Connector Type: Ten External Rear Panel SMA connectors
Mating Torque: 0.9 N•m (8 in-lb).

INPUTS (CHANNELS 1-8)

Maximum Signal Level: Any channel to any channel or chassis (1-8)

Maximum Power: 20W per module. 10W per channel.*
Safety: Conforms to European Union Directive 73/23/EEC

EN61010-1, CAT I.

EMC: Conforms with European Union Directive 89/336/EEC;

EN61326-1.

Isolation:

Multiplexer to Multiplexer: >1GΩ
Center to Shield: >1GΩ, <20pF
Channel to Channel: >100MΩ

Contact Life: 5x10
Contact Potential: <12µV
Contact Resistance: <0.5Ω (Initial), <1Ω (End Of Life)
Rise Time: <200ps (Guaranteed by design)
Signal Delay: <1.5ns

MODEL ACCESSORIES AVAILABLE

7712-SMA-1 SMA cable, male to male, 1m (3.3 ft)
7712-SMA-N 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.

30Vrms (42V peak for AC waveforms) or
42VDC, 0.5A.

6

No Load, 1x105 Rated Load (Resistive load)

Frequency (MHz)

Frequency (MHz)

Frequency (MHz)

Page 1

HW 2/05/02

Rev. A

of 2

AC Performance: (Includes end of life)

For Z

= Z

source

MAX

VSWR

MAX

Ch-Ch

Crosstalk

MAX

= 50Ω

1

<<500MHz

0.5dB 0.65dB 1.1dB 1.3dB

1.15 1.2 1.45 1.45

-75dB -70dB -50dB -45dB

1GHz 2.4GHz 3.5GHz

load

Insertion Loss

1

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.)

Specifications subject to change without notice.

Page 2

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: [phone]

1-888-KEITHLEY (534-8453) • www.keithley.com

Sales Offices: BELGIUM: Bergensesteenweg 709 • B-1600 Sint-Pieters-Leeuw • 02-363 00 40 • Fax: [phone]

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© Copyright 2003 Keithley Instruments, Inc.

Printed in the U.S.A.

5/03