HP 34970A Manual de usuario

HP 34970A

Data Acquisition / Switch Unit

User’s Guide

Part Number 34970-90002

October 1997

For Safety information, Warranties, and Regulatory information,

see the pages behind the Index.

©Copyright Hewlett-Packard Company 1997

The HP 34970A combines precision measurement capability with

flexible signal connections for your production and development test

systems. Three module slots are built into the rear of the instrument

to accept any combination of data acquisition or switching modules.

The combination of data logging and data acquisition features makes

this instrument a versatile solution for your testing requirements now

and in the future.

Convenient Data Logging Features

•Direct measurement of thermocouples, RTDs, thermistors, dc voltage,

ac voltage, resistance, dc current, ac current, frequency, and period

•Interval scanning with storage of up to 50,000 time-stamped readings

•Independent channel configuration with function, Mx+B scaling,

and alarm limits available on a per-channel basis

•Intuitive user interface with knob for quick channel selection,

menu navigation, and data entry from the front panel

•Portable, ruggedized case with non-skid feet

•HP BenchLink Data Logger Software for Microsoft® Windows ® included

Flexible Data Acquisition /Switching Features

•61⁄2-digit multimeter accuracy, stability, and noise rejection

•Up to 60 channels per instrument (120 single-ended channels)

•Reading rates up to 600 readings per second on a single channel and

scan rates up to 250 channels per second

•Choice of multiplexing, matrix, general-purpose Form C switching,

RF switching, digital I/O, totalize, and 16-bit analog output functions

•HP-IB (IEEE-488) interface and RS-232 interface are standard

•SCPI (Standard Commands for Programmable Instruments) compatibility

HP 34970A

Data Acquisition / Switch Unit

The Front Panel at a Glance

1State Storage / Remote Interface Menus

2Scan Start / Stop Key

3Measurement Configuration Menu

4Scaling Configuration Menu

5Alarm / Alarm Output Configuration Menu

6Scan-to-Scan Interval Menu

7Scan List Single Step / Read Key

8 Advanced Measurement / Utility Menus

9 Low-Level Module Control Keys

10 Single-Channel Monitor On / Off Key

11 View Scanned Data, Alarms, Errors Menu

12 Shift / Local Key

13 Knob

14 Navigation Arrow Keys

Denotes a menu key. See the next page for details on menu operation.

The Front-Panel Menus at a Glance

Several of the front-panel keys guide you through menus to configure

various parameters of the instrument (see previous page). The following

steps demonstrate the menu structure using the key.

Tip: To review the current configuration of a specific menu, press the menu key several times.

A message NO CHANGES is displayed when you exit the menu.

4Press the same menu key again to accept the

change and exit the menu. A brief confirmation

message is displayed.

2Press the same menu key again to move

to the next item of the menu. Typically,

this is where you choose parameter values

for the selected operation.

3Rotate the knob to view the choices on this

level of the menu. When you reach the end

of the list, rotate the knob in the opposite

direction to view all of the other choices.

The current selection is highlighted for emphasis.

All other choices are dimmed.

1Press the menu key. You are automatically

guided to the first level of the menu.

Rotate the knob to view the other choices

on the first level of the menu.

The menu will automatically timeout after

about 20 seconds of inactivity. You will be

returned to the operation in progress prior

to entering the menu.

Display Annunciators

To review the display annunciators, hold down the key as you

turn on the instrument.

SCAN

MON

VIEW

CONFIG

ADRS

RMT

ERROR

EXT

ONCE

MEM

LAST

MIN

MAX

SHIFT

Scan is in progress or enabled.

Press and hold again to turn off.

Monitor mode is enabled.

Press again to turn off.

Scanned readings, alarms, errors, or relay cycles are being viewed.

Channel configuration is in progress on displayed channel.

Measurement is in progress.

Instrument is addressed to listen or talk over the remote interface.

Instrument is in remote mode (remote interface).

Hardware or remote interface errors are detected.

Press to read errors.

Instrument is configured for an external scan interval.

Scan Once mode is enabled.

Press to initiate and hold key to disable.

Reading memory overflow; new readings will overwrite the oldest readings.

Viewed data is the

last

reading stored during most recent scan.

Viewed data is the

minimum

reading stored during most recent scan.

Viewed data is the

maximum

reading stored during most recent scan.

has been pressed.

Press again to turn off.

4-wire function is in use on displayed channel.

Offset compensation is enabled on displayed channel.

Alarms are enabled on displayed channel.

Mx+B scaling is enabled on displayed channel.

HI or LO alarm condition has occurred on indicated alarms.

The Rear Panel at a Glance

WARNING For protection from electrical shock, the power cord ground must not be

defeated. If only a two-contact electrical outlet is available, connect the

instrument’s chassis ground screw (see above) to a good earth ground.

1Slot Identifier (100, 200, 300)

2 Ext Trig Input / Alarm Outputs / Channel

Advance Input / Channel Closed Output

3 RS-232 Interface Connector

4 Power-Line Fuse-Holder Assembly

5Power-Line Voltage Setting

6 Chassis Ground Screw

7 HP-IB (IEEE-488) Interface Connector

Use the Menu to:

• Select the HP-IB or RS-232 interface (see chapter 2).

• Set the HP-IB address (see chapter 2).

• Set the RS-232 baud rate, parity, and flow control mode (see chapter 2).

HP BenchLink Data Logger Software at a Glance

HP BenchLink Data Logger is a Windows-based application designed

to make it easy to use the HP 34970A with your PC for gathering and

analyzing measurements. Use the software to set up your test, acquire

and archive measurement data, and perform real-time display and

analysis of your incoming measurements.

HP BenchLink Data Logger’s key functions include the following:

•Configure measurements on the spreadsheet-like Scan Setup page.

•Display measurements graphically using the real-time Data Grid,

Strip Chart, Readout, Bar Meter, XY Plot, and Histogram windows.

•Add or configure graphics at any time.

•Use graphical controls to set output voltages, close channels, output

digital values, or view alarms.

•Copy measurement data and graphics to a file or to the Clipboard for

use in other applications.

•Add textual annotation and explanations to measurement results and

test reports.

•Track readings on a single channel through the Monitor toolbar.

•Enter information into the Event Log automatically or manually

while acquiring measurement data or during post-scan analysis.

•Print scan setups, event logs, and graphics.

•Communicate with the instrument using HP-IB, RS-232, modem,

or LAN (using a LAN-to-HP-IB gateway).

To install the software, refer to “Installing HP BenchLink Data Logger

Software” on page 18.

To learn more about the software and its capabilities, refer to the

On-Line Help System for HP BenchLink Data Logger.

The Plug-In Modules at a Glance

For complete specifications on each plug-in module, refer to the module

sections in chapter 9.

HP 34901A 20-Channel Armature Multiplexer

•20 channels of 300 V switching

•Two channels for DC or AC current measurements (100 nA to 1A)

•Built-in thermocouple reference junction

•Switching speed of up to 60 channels per second

•Connects to the internal multimeter

•For detailed information and a module diagram, see page 164.

Each of the 20 channels switches both HI and LO inputs, thus providing

fully isolated inputs to the internal multimeter. The module is divided

into two banks of 10 two-wire channels each. When making four-wire

resistance measurements, channels from Bank A are automatically

paired with channels from Bank B. Two additional fused channels are

included on the module (22 channels total) for making calibrated DC or

AC current measurements with the internal multimeter (external shunt

resistors are not required). You can close multiple channels on this

module only if you have not configured any channels to be part of the

scan list. Otherwise, all channels on the module are break-before-make.

HP 34902A 16-Channel Reed Multiplexer

•16 channels of 300 V switching

•Built-in thermocouple reference junction

•Switching speed of up to 250 channels per second

•Connects to the internal multimeter

•For detailed information and a module diagram, see page 166.

Use this module for high-speed scanning and high-throughput

automated test applications. Each of the 16 channels switches both

HI and LO inputs, thus providing fully isolated inputs to the internal

multimeter. The module is divided into two banks of eight two-wire

channels each. When making four-wire resistance measurements,

channels from Bank A are automatically paired with channels from

Bank B. You can close multiple channels on this module only if you have

not configured any channels to be part of the scan list. Otherwise, all

channels on the module are break-before-make.

HP 34903A 20-Channel Actuator/General-Purpose Switch

•300 V, 1 A actuation and switching

•SPDT (Form C) latching relays

•Breadboard area for custom circuits

•For detailed information and a module diagram, see page 168.

Use this module for those applications that require high-integrity

contacts or quality connections of non-multiplexed signals. This module

can switch 300 V, 1 A (50 W maximum switch power) to your device

under test or to actuate external devices. Screw terminals on the module

provide access to the Normally-Open, Normally-Closed, and Common

contacts for each of the 20 switches. A breadboard area is provided near

the screw terminals to implement custom circuitry, such as simple

filters, snubbers, or voltage dividers.

HP 34904A 4x8 Two-Wire Matrix Switch

•32 two-wire crosspoints

•Any combination of inputs and outputs can be connected at a time

•300 V, 1 A switching

•For detailed information and a module diagram, see page 170.

Use this module to connect multiple instruments to multiple points on

your device under test at the same time. You can connect rows and

columns between multiple modules to build larger matrices such as

8x8 and 4x16, with up to 96 crosspoints in a single mainframe.

HP 34905/6A Dual 4-Channel RF Multiplexers

•HP 34905A (50Ω) / 34906A (75Ω)

•2 GHz bandwidth with on-board SMB connections

•1 GHz bandwidth with SMB-to-BNC adapter cables provided

•For detailed information and a module diagram, see page 172.

These modules offer wideband switching capabilities for high frequency

and pulsed signals. Each module is organized in two independent banks

of 4-to-1 multiplexers. Both modules offer low crosstalk and excellent

insertion loss performance. To create larger RF multiplexers, you can

cascade multiple banks together. Only one channel in each bank may be

closed at a time.

HP 34907A Multifunction Module

•Two 8-bit Digital Input/Output ports, 400 mA sink, 42 V open collector

•100 kHz Totalize input with 1 Vpp sensitivity

•Two ±12 V Calibrated Analog Outputs

•For detailed information and module block diagrams, see page 174.

Use this module to sense status and control external devices such as

solenoids, power relays, and microwave switches. For greater flexibility,

you can read digital inputs and the count on the totalizer during a scan.

HP 34908A 40-Channel Single-Ended Multiplexer

•40 channels of 300 V single-ended (common LO) switching

•Built-in thermocouple reference junction

•Switching speed of up to 60 channels per second

•Connects to the internal multimeter

•For detailed information and a module diagram, see page 176.

Use this module for high-density switching applications which require

single-wire inputs with a common LO. All relays are break-before-make

to ensure that only one relay is connected at any time.

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