Fluke 1529 6.9 Fast Measurement Mode

Channels are set firstby selectin g either simultaneous or scan mode in the

CHANNEL menu CHANNEL MODEfunction. Simultaneous mode shows one

to four channelsin the upper display simultaneously. Scan mode shows one

channel ata time (in large digit format) scanning through one to four channels

depending on the channels thatare enabled. After the mode has been selected,

use the CHANNEL menu ENABLECHANNEL function, to select the channel

to be displayed.Any channel set to ‘Off ’is not displayed. See Sections 7.1.3,

ChannelMode, and 7.1.2, Enable Channel, for more information.

Before the 1529 can accurately measure temperature, it must be configuredto

calculate temperature from the resistanceor voltageof the sensor. There are

manytemperature conversion algorithms available and the one to use depends

on the typeof sensor and its calibration. Many conversion algorithms use coef-

ficientsthat characterize the sensor. Coefficients are determined when the sen-

sor is calibrated.SPRTs and RTDs often use the ITS-90 algorithms and are

providedwith ITS-90 characterization coefficients. Thermistors often use the

Steinhart-Hartalgorithms and coefficients. Thermocouples use standard tables

or equationsdepending on its type. For additional information on conversion

types, see Section7 .2, Probe Menu.

The conversiontype and characterization coefficients for a sensor are specified

using the PROBEmenu EDIT PROBE function (see Section 7.2.1).

6.9 Fast Measurement Mode

FastMeasurement Mode applies to measure periods of 0.1, 0.2, or 0.5 seconds.

This modeallows measurements to be displayed or logged quickly.

Normally,when each measurement is made a self-calibration of the measure-

ment circuitis performed simultaneouslyduring the measurement process to

offseterrors from component drift and spurious EMFs. For measure periods of

0.1, 0.2, and 0.5 seconds, thefast measurement rate is achieved by foregoing

the self-calibration. The drawbackto this FastMeasurement Mode is the accu-

racyof the measurement may be poor and subject to drift. Accuracy can be

temporarilyimproved using the AUTO-CAL function that appears in the

CHANNEL menu when in thisFast Measurement Mode. The AUTO-CAL

function causes the instrument to perform a single self-calibration of the mea-

surement circuitthen resume fastmeasuring (without automatic

self-calibration).

See Section 8.1.1 for detailed information on using the Fast Measurement

Mode.

1529 Chub-E4 Thermometer Readout

User’s Guide