HP 34970A User Manual download pdf (Page 51)

The system configuration shown on the previous page offers the

following advantages:

• You can use the HP 34970A to perform data storage, data reduction,

mathematical calculations, and conversion to engineering units.

You can use the

PC to provide easy configuration and data presentation.

• You can remove the analog signals and measurement sensors from

the noisy

PC environment and electrically isolate them from both the

PC and earth ground.

• You can use a single

PC to monitor multiple instruments and

measurement points while performing other

PC-based tasks.

The Computer and Interface Cable

Since computers and operating systems are the subject of many books

and periodicals, they are not discussed in this chapter. In addition to the

computer and operating system, you will need a serial port (

RS-232) or

HP-IB port (IEEE-488) and an interface cable.

Serial (RS-232) HP-IB (IEEE-488)

Advantages Disadvantages Advantages Disadvantages

Often built into the computer;

no additional hardware is

required.

Cable length is limited

to 45 ft (15 m). *

Speed; faster data and

command transfers.

Cable length is limited

to 60 ft (20 m). *

Drivers usually included in

the operating system.

Only one instrument or

device can be connected

per serial port.

Additional system flexibility,

multiple instruments can

be connected to the

same HP-IB port.

Requires an expansion

slot plug-in card in PC

and associated drivers.

Cables readily available

and inexpensive.

The HP 34970A is

shipped with a serial cable

(if internal DMM is ordered).

Cabling is susceptible to

noise, causing slow or

lost communications.

Varying connector pinouts

and styles.

Direct Memory Transfers

are possible.

Requires special cable.

Data transfers up to

85,000 characters/sec.

Data transfers up to

750,000 characters/sec.

* You can overcome these cable length limitations using special communications hardware.

For example, you can use the HP E2050A LAN-to-HP-IB Gateway interface or a serial modem.

Chapter 3 System Overview

Data Acquisition System Overview

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HP 34970A User Manual Page 51

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