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1 Before You Start
Before You Start
Introduction
Fluke’s Hart Scientific Division’s 1620A is a low-cost, high-accuracy, digital thermo-hygrom-
eter. Its unique combination of features makes it suitable for a wide variety of applications from
laboratory to industrial ambient measurement. Features of the thermo-hygrometer include:
Two channels measure ambient temperature to ± 0.125 °C and %RH to ± 1.5 %
Two sensor capability (second sensor optional), each measuring temperature and relative
humidity; each is detachable, cable-extendable, and interchangeable, with self-contained
calibration; each may be assigned a unique 16-character identification
Display resolution is user selectable up to 0.001 °C and 0.01% RH
On-board memory holds up to 400,000 time/date-stamped readings
Serial RS-232 interface for reading measurements and access to settings
Ethernet LAN interface provides TCP/IP communicatins and embedded HTML web
page for reading measurements over a network
Optional wireless RF 802.15.4 (ZigBee) for remote operation
Visual and audio alarms for various alarm or fault conditions, alarm output port
May be wall mounted or set on a bench top
Detachable sensors contain their own calibration data for easy recalibrations
Optional software logs in real-time or shows graphical/statistical data
Password protection of settings
Large LCD displays temperature and humidity data graphically, numerically, and
statistically; 16 pre-defined, user-changeable screen setups
Power 12 V dc from external 110-240 V ac to dc converter
Uses a standard 9V battery backup to allow continued measuring during power
interruptions
Symbols Used
Table 1 lists the International Electrical Symbols. Some or all of these symbols may be used on
the instrument or in this manual.
Table1 International and electrical symbols
Symbol
Description
AC (Alternating Current)
AC-DC
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