Keysight DAQ970A User Guide

characteristics. These include measurement resolution, reading speed, and the ability to reject spurious
noise. There are several analog-to-digital conversion techniques but they can be divided into two types:
integrating and non-integrating. The integrating techniques measure the average input value over a
defined time interval, thus rejecting many noise sources. The non-integrating techniques sample the
instantaneous value of the input, plus noise, during a very short interval. The internal DMMuses an integ-
rating ADCtechnique.
Main processor
The main processor, located in the floating logic section, controls the input signal conditioning, ranging,
and the ADC. The main processor accepts commands from, and sends measurement results to, the earth-
referenced logic section. The main processor synchronizes measurements during scanning and control
operations. The main processor uses a multi-tasking operation system to manage the various system
resources and demands.
The main processor also calibrates measurement results, performs Mx+B scaling, monitors alarm con-
ditions, converts transducer measurements to engineering units, time stamps scanned measurements,
and stores data in non-volatile memory.
Scanning
The instrument allows you to combine a DMM (either internal or external) with multiplexer channels to cre-
ate a scan. During a scan, the instrument connects the DMM to the configured multiplexer channels one at
a time and makes a measurement on each channel.
Before you can initiate a scan, you must set up a scan list to include all desired multiplexer or digital chan-
nels. Channels which are not in the scan list are skipped from the scan. The instrument automatically
scans the list of channels in ascending order from slot 1 through slot 3. Measurements are taken only dur-
ing a scan and only on those channels which are included in the scan list.
You can store up to 100,000 readings in non-volatile memory during a scan. Readings are stored only dur-
ing a scan and all readings are automatically time stamped. Each time you start a new scan, the instru-
ment clears all readings stored in memory from the previous scan. Therefore, all readings currently stored
in memory are from the most recent scan.
You can configure the event or action that controls the onset of each sweep through the scan list (a sweep
is one pass through the scan list):
You can set the instrument's internal timer to automatically scan at a specific interval as shown below. You
can also program a time delay between channels in the scan list.
3 Features and Functions
60 Keysight DAQ970A User's Guide

Keysight DAQ970A Specifications

General

Scan Rate	Up to 450 channels/sec
Connectivity	USB, LAN, GPIB (optional)
Display	4.3-inch color LCD
Operating Temperature	0 °C to 50 °C
Number of slots	3 slots
Measurement Types	DCV, ACV, DCI, ACI, 2-wire resistance, 4-wire resistance, frequency, temperature, capacitance
Voltmeter	6.5 digit
Resolution	22 bits
Memory	Non-volatile memory