Agilent Technologies Agilent 34980A Istruzioni per l'installazione e il funzionamento

How your 3499A/B/C Test System

Benefits From Upgrading to the New

34980A Switch/Measure/Control System

Application Note

This application note will describe

differences and advantages of the

new 34980A as compared to the

3499A/B/C. The 34980A

witch/Measure ystem masters

switching, measurement, and

control features by offering a

superior selection of switch

topologies and system control

features. A state-of-the-art DMM

has been integrated into the

34980A mainframe providing a

wide variety of measure capability.

The 34980A mainframe also

includes standard PC connections

and instrument control options for

your ease of use.

Discover the detailed advantages of

upgrading your test system using

the 34980A in this document.

Measurements

One of the advantages of the new

34980A is its ability to make

highly accurate test system

measurements. The integration of

a high-speed DMM into the

mainframe enhances the 34980A

switch and control system by

providing voltage, current,

temperature, frequency, and

resistance measurements without

using any of the mainframe’s

available eight slots. The DMM

conveniently generates

measurement results in selectable

engineering units. Eleven

different types of measurements

can be made and are listed on the

page 2. The 34980A time-stamped

measurement data can be stored

or displayed and analyzed as the

measurements are acquired. The

34980A also has configurable

High/Low limits on each channel

that activate an alarm if the input

signals are out of the set range.

The 34980A’s integrated DMM

saves you time and money by

reducing the number of individual

instruments required, and

additional cabling for

measurements and triggering. In

comparison, the 3499A/B/C

switch requires an external DMM

or other measurement instrument

as well as additional wiring to

provide the same functionality.

Add functionality, streamline your test

programs, and reduce the physical test

system size by upgrading from your

3499A/B/C to the new 34980A

Multifunction Switch/Measure Unit. 34980A Mainframe, plug-in modules and terminal cards

List of 34980A Measurement

Capabilities

• Temperature measured with

Thermocouples, RTDs and

Thermistors

• DC and AC volts

• 2- and 4-wire Resistance

• Frequency and Period

• DC and AC current

• 4 alarms for High/Low or both

limits for each channel

• Digital I/O

• Analog outputs (DAC)

The 34980A mainframe also

includes four 2-wire internal

analog buses. This is a

differentiating 34980A feature and

not included with the 3499A/B/C.

The analog buses can be used to

route measurements directly to

the internal DMM or connect the

mainframe modules to external

instruments. The analog bus can

be used to extend modules such as

the matrix switch modules, or

provide additional signal routing

between modules.

Mainframes

The 34980A Multifunction

witch/Measure Unit consists of

an eight-slot mainframe with an

optional DMM. The DMM is

mounted directly behind the front

panel so it does not require any of

the available eight module slots.

A choice from 19 different

modules can be plugged directly

into the eight-slot mainframe.

In comparison, the 3499 Family

has mainframes in three different

sizes: A, B, and C that house five,

two, and nine modules

respectively. The 3499 Family

offers a selection of 30 plug-in

modules, 13 of which are the

earlier generation HP 3488A

witch/Control Unit modules.

ince some of the modules were

designed for the 3488, and some

modules specifically for the 3499,

there is duplicate functionality

between the modules.

As test systems and capability

needs expand there is a call for a

greater number of switch

channels within one system. The

34980A switch modules are

designed for high switching

channel count. The 34980A eight-

slot mainframe fully loaded with

2-wire multiplexer modules

houses a total switch channel

count of 560. The 3499C nine-slot

mainframe fully loaded with 2-

wire multiplexer modules houses

a total of 360 switch channels.

For a quick summary of the

maximum switch channel count

for the switch systems

mainframes, see Table 1.

Mainframe Mainframe Size Number of Module Slots Maximum Number

of Channels (2-wire)

34980A Full Rack, 3U 8 560

3499B Rack, 2U 2 80

3499A Half Rack, 2U 5 200

3499C Full Rack, 5U 9 (electrical)/ 360

14 (physical)

Table 1. Max 2-wire Mux channel count per Mainframe

Modules

The 34980A implements a

superior selection of switch

topologies. The 34980A switch

topologies are similar to

3499A/B/C switch modules and

include multiplexers, matrixes,

high-power, general purpose, and

RF/microwave switches.

However, the 34980A modules

have utilized the newest switch

technology which enables a higher

density of channels per module,

and the ability to achieve the

faster scan rates with the

integrated DMM. The 34980A

offers other functionality used in

test systems and includes digital

I/O, a counter/totalizer and D/A

converters. New 34980A

functions include a FET

multiplexer switch module, a

counter/timer and digital I/O with

pattern generator/detector along

with digital I/O and D/A

converters. The 34980A RF and

microwave switch drivers offer

functionality for a broader range

of RF/microwave switches being

used by customers today.

The 3499A/B/C does provide a

selection of optics switching

which is not available with the

34980A. Table 2 shows the

34980A and 3499A/B/C system

modules organized by switch

and/or measurement type. It is

easy to compare and upgrade

from the 3499A/B/C switch

modules to the new 34980A

switch modules as well as add

new switch, measurement and

control capabilities.

Benefits of the new 34980A

modules vs 3499A/B/C modules

• Increased channel count per

module with the same switch

reliability

• Increased drivability for

various RF/uWave switches

• High peed FET multiplexer

• Reed Matrix switch

• witch/attenuator driver

• Counter/Timer

• High peed Digital I/O with

memory

• Analog output with waveform

capabilities

• Breadboard module

with +5V, +12V

With so many different types of

switch modules to choose from,

you can easily identify the

modules from Table 2 that

provide the best solution to meet

your test application needs. For

detailed module specifications,

please refer to the product data

sheets available at these web

locations:

http://www.agilent.com/find/34980A

and

http://www.agilent.com/find/3499

3499A/B Mainframe and plug-in modules

Module Type 34980A 3499A/B/C

Multiplexer 34921A 40 Ch armature 300V 1A N2260A 40 Ch armature 200V 1A

34922A 70 Ch armature 300V 1A N2266A 40 Ch reed 200V .5A

34923A 40 Ch reed 200V .5A N2270A 10 Ch 1000V 1A

34924A 70 Ch reed 80V .5 44470A 10 Ch armature 250V 2A

34925A 40 Ch FET +/-80V .5A 44470D 20 Ch armature 250V 2A

General Purpose 34937A 28 Ch, 1A and 4 Ch, 5A N2261A 40 Ch

34938A 20 Ch, 5A N2267A 8 Ch, 8A

44471A 10 Ch

44471D 20 Ch

44477A 7 Ch SPDT (Form C)

Matrix 34931A Dual 4x8 armature 300V 1A N2262A 4x8 armature 200V 1A

34932A Dual 4x16 armature300V 1A 44473A 4x4 armature 250V 2A

34933A Dual 4x8 reed 80V .5A

Digital I/O See multifunction 34950A, 34952A N2263A 32-bit TTL

44474A 16-bit TTL

Multifunction 34952A 32-bit Digital I/O with 2 Ch N2264A 12 GP, 3 GP 5A, 16-bit Dig I/O

DAC and Counter/Timer N2265A 4x4 matrix, 16-bit Dig I/O

34950A 64-bit Digital I/O with Pattern N2269A 2 DAC, 16-bit Dig I/O

Generator/Detector

Fiber-Optic Multiplexer N2280A Quad 1x2

N2281A Dual 1x4

N2282A Single 1x8

RF & Microwave 34941A Quad 1x4 RF 1.5G 50Ω, SMA N2268A Dual 1x4 3.5G 50Ω

34946A 4G/20G 50Ω, 2 SPDT SMA N2272A Single 1x9 1.0G 50Ω

(N1810TL) N2276A Dual 1x6 20G 50Ω

34947A 4G/20G 50Ω, 3 SPDT, SMA (87106B/4B)

(N1810UL) 44472A Dual 1x4 300M 50Ω

44478A Dual 1x4 1.3G 50Ω

44476A Triple 1x2 18G 50Ω

(8762B)

34942A Quad 1x4 RF 1.5G 75Ω, mSMB 44478B Dual 1x4 1.3G 75Ω

34945A uwave Switch/Attn Driver N2276B Relay driver (2 switches)

32 SPDT or 8 attenuators Choose from switches;

The following µwave switches and 87104A/B/C

attenuators are supported with 87106A/B/C

the distribution1boards; also drive two external attenuators

N181x series SPDT switches 84904/6/7/K/L

876X series SPDT switches

87104x/106x multi-port switches 44476B Relay driver (2 switches)

87606x series matrix switches Choose from switches;

8722x transfer switches 8762A/B/C/F

849x series attenuators 8763B/C

8490x series attenuators 8764B/C

Generic screw terminal connections

Third-party switches (screw terminals)

DAC 34951A Quad 16-bit D/A Converter See multifunction

Breadboard 34959A +12 V, +5 V 44475A 5.5

Table 2. Direct comparison of 34980A and 3499 modules

User Interface

The 34980A offers the most

modern instrument I/O options for

interfacing a controller PC with the

switch system: GPIB, U B and

LAN. All three Input/Output

interface connections come

standard with the 34980A

mainframe. If you choose to modify

or upgrade your test system I/O,

the 34980A is system ready.

You can also easily control the

34980A without connecting to a PC

by pressing the front-panel buttons,

an advantage when first setting up

or troubleshooting a system.

Upgrading your test system from

using the 3499A/B/C GPIB to the

34980A GPIB, or newer U B or

LAN is quick and easy. If you have

used I/O Config from the Agilent

I/O Libraries to set your GPIB

instrument connection, you would

use the same I/O Config to set up

your LAN or “TCPIP” instrument

connection. Retrieve the LAN,

TCPIP address from your

instrument and enter it into I/O

Config. When you address your

instrument in a program, it will

look similar to; TCPIP0::9::IN TR.

For more information on

connecting to Agilent instruments

you can access the Agilent

Technologies U B/LAN/GPIB

Interfaces Connectivity Guide at

www.agilent.com/find/connectivity

With LAN, the instrument can be

located closer to the device under

test without worrying about the

distance to the PC. A U B to

instrument connection is even

easier. The computer

automatically detects instruments

that are U B ready. If you are

currently using the 3499A/B/C

R 232 interface, it is recommended

to upgrade to the 34980A GPIB,

U B or LAN interface to achieve

optimal data transfer rates.

Instrument Control

(Programming)

The 34980A and 3499A/B/C can

both be controlled locally from the

front panel, or by sending either

instrument or driver commands

from a PC for remote control. The

34980A’s instrument commands

and drivers are based on modern

standards such as CPI (standard

commands for programmable

instruments) and IVI-C and IVI

COM drivers. The CPI instrument

commands of the 34980A are

similar to the 3499A/B/C’s but

they are not interchangeable. A

comparison of the commands is

provided in appendix A. The

34980A's IVI-C and IVI-COM

drivers are similar to Plug & Play

drivers, the 3499A/B/C's Plug &

Play driver for example, but

include improvements. The IVI

(Interchangeable Virtual

Instruments) driver specification

was built upon the Plug&Play

driver specification but adds the

capabilities provided by the

Microsoft ActiveX technologies

which simplify instrument

interchangeability, and product

performance. The 34980A also

includes many new commands for

the operation of the embedded

DMM. A 34980A Web interface

provides a new easy way to

communicate via LAN with the

instrument.

Table 3 shows a summary of the

programming control options

available for the 3499A/B/C and the

34980A. There is similarity between

the instrument commands, however,

the 34980A has evolved to use the

most modern and widely accepted

instrument command standards.

Table 3. Control Options for 3499A/B/C and 34980A

3499A/B/C 34980A

Front Panel Buttons 

3488 Legacy Commands 

SCPI Commands 

Plug & Play driver 

IVI COM driver 

IVI-C driver 

LabVIEW driver 

Web Interface 

Web Page Interface

The 34980A comes with a built-in

detailed instrument web page that

allows you to remotely connect and

communicate with the mainframe

and installed modules. You

establish a LAN connection, either

directly between the 34980A and

PC, or from the 34980A to an

existing Local Area Network. The

instrument Web page resides on

the 34980A and can be accessed

using a standard web browser such

as Netscape or Internet Explorer

on a PC. Just type the IP address

into the web browser. The web

interface allows you to select any of

the installed modules and view the

current configuration, change

settings, make measurements, and

makes it easy to troubleshoot or

debug the switch/measure system.

The instrument web interface also

allows you to check the current

status of the instrument by viewing

the error queue, calibration status

and the accumulated module

switch closures.

Listed below are each of the many ways available to communicate and

control the 34980A, the communication options and their description

Web interface display for 34921A MUX Switch module

Web interface display of scanned measurements

Table 4. Command comparisons

34980A 3499A/B/C

Close channel 10 on the module in slot 3

ROUTe:CLOS (@3010) [ROUTe:]CLOS (@310)

Scan channels 0 through 40 on the module in slot 1

ROUTe:SCAN (@1001:1040) [ROUTe:]SCAN (@100:140)

and channel(s) rather than only

three digits as the 3499A/B/C

uses. Also, for the 3499A/B/C the

[ROUTe] in the command

structure is optional, where with

the 34980A it is required.

The 34980A offers new

measurement and module

capabilities such as counter/timer

and digital I/O with pattern

generator/detector that use

commands unique to their

functionality. Appendix A includes

a list of the 34980A and 3499A/B/C

commands as well as direct

comparisons of the commands.

SCPI Commands

The 34980A can be programmed

using CPI commands or the IEEE

standard commands.

Configuration, measurements and

system control of the mainframe

and modules are easily achieved

using these instrument commands.

One difference between

instrument commands for the

3499A/B/C and the 34980A relates

to addressing specific channels in

the system. Table 4 shows an

example difference in 3499A/B/C

switch control commands

compared to 34980A commands.

Notice the 34980A uses four digits

to address the module slot number

IVI-C, IVI COM and LabVIEW

instrument drivers

34980A IVI-C, IVI COM and

LabVIEW instrument drivers are

available for simplified

programming. If you currently

program using Plug&Play drivers,

the IVI-C driver is similar and can

be used to program in the same

way. The IVI COM driver conforms

to the most modern IVI COM

instrument driver standard and

can be used in any programming

environment. LabVIEW

programmers are able to use the

34980A LabVIEW instrument

driver for their graphical

programming environment.

Example program. 34980A SCPI commands in VEE

Scan Feature

The scan feature is a sequence of

alternating switch closures and

measurements. This feature is

provided by both the 34980A and

a 3499A/B/C combined with a

DMM or other measurement

instrument. The 34980A increases

the measurement scan abilities

and offers more than twice the

number of scanned channels

within one scan list compared to

the 3499A/B/C as seen here.

Single Scan List Size:

34980A Up to 560

2-wire channels

Up to 640

1-wire channels

3499A/B/C Up to 200 channels

and/or bits

Although the 34980A scan feature

can be used with either the

internal DMM or with an external

instrument, using the integrated

DMM provides a faster and more

efficient scan rate. The integrated

DMM eliminates the need for

external instrument triggers and

wiring. The 3499A/B/C scan list

requires the use of instrument

triggers to work with an external

DMM or other measurement

instrument. Each switch module is

rated with individual switch scan

rates. A comparison of the scan

rates for both systems Multiplexer

and Matrix switch modules is

shown in Table 5 below.

Another advantage the 34980A

system has over the 3499A/B/C

system is its ability to store

measurement readings. When the

34980A internal DMM is used, up

to 500,000 time stamped readings

can be stored in volatile memory.

The 3499A/B/C cannot store

readings but does offer more scan

configurability. For example,

once a 3499A/B/C scan list is set

up, the user can select an arm

source, a trigger source, the

number of sweeps, and the delay

time for each individual channel

within the scan list.

Module Type

34980A Scan Rate 3499A/B/C Scan Rate

Modules Ch/s Modules Ch/s

Multiplexer 34921A 40 Ch armature 100 N2260A 40 Ch armature 80

34922A 70 Ch armature 100 N2266A 40 Ch reed 350

34923A 40 Ch reed 500 N2270A 10 Ch 100

34924A 70 Ch reed 500 44470A 10 Ch armature 43

34925A 40 Ch FET 1000 44470D 20 Ch armature 43

Matrix 34931A Dual 4x8 armature 100 N2262A 4x8 armature 80

34932A Dual 4x16 armature 100 44473A 4x4 armature 43

34933A Dual 4x8 reed 500

Table 5. 34980A and 3499A/B/C Multiplexer & Matrix module scan rates

Monitor Feature

The 34980A monitor feature

allows you to monitor readings

acquired by the switch/measure

system. You can also monitor

readings acquired with the

34980A internal DMM. To

monitor a measurement from the

front panel, simply select the

channel and press either the

Measure [DMM] or [Channel]

button to see a continually

updated channel output or state

on the front display. For

programs, use the

ROUTe:MONitor:DATA?

Command. The command reads

the data from the channel

currently selected by the Monitor

function. One reading is displayed

for each monitor command. The

Web interface can also be used to

monitor a channel measurement.

The 3499A/B/C monitor feature

allows users to continuously

monitor a selected switch or

module status from the front

display. A channel monitor can

be set up using the front panel

buttons or instrument commands.

The 3499A/B/C monitor output

can be a specific switching

channel, a digital I/O port or the

state of all switches or digital I/O

on one plug-in module. The

3499A/B/C allows a single

channel to be monitored

continuously even during an

instrument scan.

Stored State Feature

The 34980A is also able to

store/recall up to six (0 through

5) instrument setups. A stored

setup state can be automatically

recalled at any time, even during

a power up state. The stored

state feature contains the state of

the plug-in modules including

channel configurations, scanning

setups, alarm values, and Mx + B

scaling values. Location 0 is

typically used for the Factory

Reset and power down state, but

can also be programmed with a

new setup.

The 3499A/B/C is able to store

and recall up to 50 instrument

setup states with revision 4.0.

The instrument setups include the

status of relay channels, and/or

the static digital I/O state, module

configuration, and scanning

setups (scan lists, arm count, arm

source, etc.). The 3499A/B/C is

not able to automatically power

up in a stored state.

Switch and Measurement

Connections

Most often, test systems must be

flexible enough to be easily moved

to a new location or modified for

different devices under test.

Having a removable wiring

terminal block or a pre-wired cable

is optimal in these situations. The

module’s terminal and/or cable

can simply be removed and

replaced with a different terminal

for the new test configuration. This

prevents the need to rewire the

same terminal each time for

different applications.

Fortunately, both the 34980A and

3499A/B/C provide the removable

terminals and pre-wired cables so

changing your test system wiring

from the 3499A/B/C to the 34980A

is fairly simple.

The 34980A offers the ability to

use either standard Dsub 50 and

Dsub 78 connectors/cables,

detachable terminal cards or mass

interconnect connections. The RF

and Microwave modules include

standard connectors such as MA

and MB. The 34980A cables

(Dsub50 and Dsub78) are low cost

and readily available from many

sources. The detachable screw

terminal blocks are easy to wire

and include built-in cable strain

relief. The screw terminals attach

to the switch modules with a

secure latching mechanism for

ease of use and improved

connection reliability. No tools

are required to easily connect and

disconnect the wired terminals.

The 3499 terminals are secured to

the module and housing by screws

at the end of the terminals and

require a screwdriver to remove

or replace.

For more complex test system

wiring, mass interconnect (one

location in a system where the

switch, instruments and DUT are

interconnected) is made easy by

using solutions provided by

connection experts. The standard

Dsub 50 and Dsub 78 connectors

make it faster and easier for Mass

Interconnect suppliers to provide a

test system wiring solution. The

easy to use connections facilitate

time and cost savings for test

systems using the 34980A.

The 34980A terminal wiring and

cables are different from that of

the 3499A/B/C. However, they

offer a better solution to test

system interface due to the use of

highly reliable standard

connectors and low cost cables.

Refer to Table 2 for the modules

that have optional terminal

blocks or the 34980A data sheet

for specific module wiring

connection details:

http://www.agilent.com/find/34980A.

The 3499A/B/C offers removable

screw terminal blocks for many of

the modules and also an option for

pre-wired DIN96 to quad D25, or

dual D50 cables. ome of the

modules such as the Optics,

Microwave and RF modules

include the MA or BNC terminals

for application specific

connections. Refer to Table 2 for

modules that include terminals.

34980A Modules and Std DSub 50/78 connectors 3499A/B/C Modules and Terminals

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