HP 34970A manual Data Acquisition System Overview, Advantages Disadvantages

Chapter 3 System Overview

Data Acquisition System Overview

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	Serial (RS-232)				HP-IB (IEEE-488)
	Advantages			Disadvantages	Advantages	Disadvantages
Often built into the computer;			Cable length is limited		Speed; faster data and	Cable length is limited
no additional hardware is			to 45 ft (15 m). *		command transfers.	to 60 ft (20 m). *
required.
Drivers usually included in			Only one instrument or		Additional system flexibility,	Requires an expansion
the operating system.			device can be connected		multiple instruments can	slot plug-in card in PC
			per serial port.		be connected to the	and associated drivers.
					same HP-IB port.
Cables readily available			Cabling is susceptible to		Direct Memory Transfers	Requires special cable.
and inexpensive.			noise, causing slow or		are possible.
The HP 34970A is			lost communications.
shipped with a serial cable			Varying connector pinouts
(if internal DMM is ordered).			and styles.
			Data transfers up to		Data transfers up to
			85,000 characters/sec.		750,000 characters/sec.
* x	8
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