Fluke 1620A Operating Manual
1620A “DewK”
Thermo-Hygrometer
January 2003 Rev. 1, 3/13
© 2003-2013 Fluke Corporation. All rights reserved. Specifications are subject to change without notice.
All product names are trademarks of their respective companies.
User’s Guide
LIMITED WARRANTY AND LIMITATION OF LIABILITY
Each Fluke product is warranted to be free from defects in material and workmanship under normal use and
service. The warranty period is one year and begins on the date of shipment. Parts, product repairs, and
services are warranted for 90 days. This warranty extends only to the original buyer or end-user customer of
a Fluke authorized reseller, and does not apply to fuses, disposable batteries, or to any product which, in
Fluke's opinion, has been misused, altered, neglected, contaminated, or damaged by accident or abnormal
conditions of operation or handling. Fluke warrants that software will operate substantially in accordance with
its functional specifications for 90 days and that it has been properly recorded on non-defective media. Fluke
does not warrant that software will be error free or operate without interruption.
Fluke authorized resellers shall extend this warranty on new and unused products to end-user customers
only but have no authority to extend a greater or different warranty on behalf of Fluke. Warranty support is
available only if product is purchased through a Fluke authorized sales outlet or Buyer has paid the
applicable international price. Fluke reserves the right to invoice Buyer for importation costs of
repair/replacement parts when product purchased in one country is submitted for repair in another country.
Fluke's warranty obligation is limited, at Fluke's option, to refund of the purchase price, free of charge repair,
or replacement of a defective product which is returned to a Fluke authorized service center within the
warranty period.
To obtain warranty service, contact your nearest Fluke authorized service center to obtain return
authorization information, then send the product to that service center, with a description of the difficulty,
postage and insurance prepaid (FOB Destination). Fluke assumes no risk for damage in transit. Following
warranty repair, the product will be returned to Buyer, transportation prepaid (FOB Destination). If Fluke
determines that failure was caused by neglect, misuse, contamination, alteration, accident, or abnormal
condition of operation or handling, including overvoltage failures caused by use outside the product’s
specified rating, or normal wear and tear of mechanical components, Fluke will provide an estimate of repair
costs and obtain authorization before commencing the work. Following repair, the product will be returned to
the Buyer transportation prepaid and the Buyer will be billed for the repair and return transportation charges
(FOB Shipping Point).
THIS WARRANTY IS BUYER'S SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU OF ALL OTHER
WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY
OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. FLUKE SHALL NOT BE LIABLE
FOR ANY SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES OR LOSSES,
INCLUDING LOSS OF DATA, ARISING FROM ANY CAUSE OR THEORY.
Since some countries or states do not allow limitation of the term of an implied warranty, or exclusion or
limitation of incidental or consequential damages, the limitations and exclusions of this warranty may not
apply to every buyer. If any provision of this Warranty is held invalid or unenforceable by a court or other
decision-maker of competent jurisdiction, such holding will not affect the validity or enforceability of any other
provision.
Fluke Corporation
P.O. Box 9090
Everett, WA 98206-9090
U.S.A.
Fluke Europe B.V.
P.O. Box 1186
5602 BD Eindhoven
The Netherlands
11/99
To register your product online, visit register.fluke.com
Table of Contents
1 Before You Start . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 Symbols Used . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.2.1 Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.2.2 Cautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.3 Authorized Service Centers. . . . . . . . . . . . . . . . . . . . . . 3
2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3 Specifications and Environmental Conditions . . . . . . . . . . 9
3.1 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.2 Environmental Conditions. . . . . . . . . . . . . . . . . . . . . . 10
4 Quick Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.1 Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.2 Use Proper Care . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.3 Learn About the Features and Components . . . . . . . . . . . . . 11
4.4 Install the Battery . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.5 Connect the Sensor . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.6 Connect the Power Source . . . . . . . . . . . . . . . . . . . . . 12
4.7 Switch the Power On . . . . . . . . . . . . . . . . . . . . . . . . 12
4.8 Measure Temperature . . . . . . . . . . . . . . . . . . . . . . . . 12
5 Parts and Controls . . . . . . . . . . . . . . . . . . . . . . . . 13
5.1 Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.2 Top Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.3 Right Side Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.4 Left Side Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.5 Back Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.6 Quick Buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.7 Configurations. . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.8 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6 General Operation . . . . . . . . . . . . . . . . . . . . . . . . 19
6.1 DC Power Source . . . . . . . . . . . . . . . . . . . . . . . . . . 19
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6.2 Battery. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.3 Sensor Configuration . . . . . . . . . . . . . . . . . . . . . . . . 20
6.4 Power Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
6.5 Power On Self-Test . . . . . . . . . . . . . . . . . . . . . . . . . 20
6.6 Display Contrast. . . . . . . . . . . . . . . . . . . . . . . . . . . 20
6.7 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.8 Alarm Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.9 Measuring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.10 Unit of Temperature . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.11 Recording Measurements . . . . . . . . . . . . . . . . . . . . . . 21
6.12 Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.12.1 Sensor Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
7 Menu Functions. . . . . . . . . . . . . . . . . . . . . . . . . . 25
7.1 Channel Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
7.1.1 Channel Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
7.1.2 Sensor ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
7.1.3 Sensor Lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
7.1.4 Sensor Cal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
7.2 Display Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
7.2.1 Display Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
7.2.2 Display Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
7.2.3 Field Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
7.2.4 Graph Scale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
7.2.5 Display Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
7.3 Data Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
7.3.1 Data Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
7.3.1.1 Record Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
7.3.1.2 Data View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
7.3.1.3 Data Print . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
7.3.1.4 Data Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
7.3.1.5 Data Clear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
7.3.2 Daily Stats. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
7.3.2.1 Stats Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
7.3.2.2 Stats View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
7.3.2.3 Stats Print . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
7.3.2.4 Stats Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
7.3.2.5 Stats Clear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
7.4 Alarm Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
7.4.1 Alarm Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
7.4.2 Sensor Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
7.4.3 System Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
7.4.4 Alarm View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
7.5 System Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
7.5.1 System Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
7.5.2 Date Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
ii
7.5.3 Comm Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
7.5.3.1 Serial . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
7.5.3.2 RF (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
7.5.3.3 LAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
7.5.4 Password . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
7.5.5 System Info . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
8 Digital Communications Interface . . . . . . . . . . . . . . . 69
8.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
8.1.1 Serial RS-232 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
8.1.2 RF Wireless (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
8.1.3 LAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
8.1.4 Command Syntax . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
8.2 Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
8.2.1 Alarm Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
8.2.1.1 ALARm:BATTery? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
8.2.1.2 ALARm:BATTery:ENABle? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
8.2.1.3 ALARm:BATTery:ENABle <bool> . . . . . . . . . . . . . . . . . . . . . . . . . . 80
8.2.1.4 ALARm:BEEP:ENABle?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
8.2.1.5 ALARm:BEEP:ENABle <bool> . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
8.2.1.6 ALARm:CLEar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
8.2.1.7 ALARm:DATE:FIRSt? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
8.2.1.8 ALARm:DATE:LAST? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
8.2.1.9 ALARm:DISPlay:ENABle? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
8.2.1.10 ALARm:DISPlay:ENABle <bool> . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
8.2.1.11 ALARm:PORT? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
8.2.1.12 ALARm:PORT <bool> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
8.2.1.13 ALARm:PORT:ENABle?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
8.2.1.14 ALARm:PORT:ENABle <bool> . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
8.2.1.15 ALARm:POWer? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
8.2.1.16 ALARm:POWer:ENABle? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
8.2.1.17 ALARm:POWer:ENABle <bool> . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
8.2.1.18 ALARm:RHUMidity<chn>:LOWer? . . . . . . . . . . . . . . . . . . . . . . . . . 83
8.2.1.19 ALARm:RHUMidity<chn>:LOWer:ENABle?. . . . . . . . . . . . . . . . . . . . . 83
8.2.1.20 ALARm:RHUMidity<chn>:LOWer:ENABle <bool> . . . . . . . . . . . . . . . . . 83
8.2.1.21 ALARm:RHUMidity<chn>:LOWer:LIMit? [MIN|MAX|DEF] . . . . . . . . . . . . 83
8.2.1.22 ALARm:RHUMidity<chn>:LOWer:LIMit <float>|MIN|MAX|DEF . . . . . . . . . 84
8.2.1.23 ALARm:RHUMidity<chn>:RATE? . . . . . . . . . . . . . . . . . . . . . . . . . . 84
8.2.1.24 ALARm:RHUMidity<chn>:RATE:ENABle? . . . . . . . . . . . . . . . . . . . . . 84
8.2.1.25 ALARm:RHUMidity<chn>:RATE:ENABle <bool>. . . . . . . . . . . . . . . . . . 84
8.2.1.26 ALARm:RHUMidity<chn>:RATE:LIMit? [MIN|MAX|DEF] . . . . . . . . . . . . 85
8.2.1.27 ALARm:RHUMidity<chn>:RATE:LIMit <float>|MIN|MAX|DEF . . . . . . . . . . 85
8.2.1.28 ALARm:RHUMidity<chn>:SENSor? . . . . . . . . . . . . . . . . . . . . . . . . . 85
8.2.1.29 ALARm:RHUMidity<chn>:SENSor:ENABle? . . . . . . . . . . . . . . . . . . . . 85
8.2.1.30 ALARm:RHUMidity<chn>:SENSor:ENABle <bool> . . . . . . . . . . . . . . . . 86
8.2.1.31 ALARm:RHUMidity<chn>:UPPer? . . . . . . . . . . . . . . . . . . . . . . . . . . 86
8.2.1.32 ALARm:RHUMidity<chn>:UPPer:ENABle? . . . . . . . . . . . . . . . . . . . . . 86
8.2.1.33 ALARm:RHUMidity<chn>:UPPer:ENABle <bool> . . . . . . . . . . . . . . . . . 86
8.2.1.34 ALARm:RHUMidity<chn>:UPPer:LIMit? [MIN|MAX|DEF] . . . . . . . . . . . . 86
8.2.1.35 ALARm:RHUMidity<chn>:UPPer:LIMit <float>|MIN|MAX|DEF. . . . . . . . . . 87
8.2.1.36 ALARm:TEMPurature<chn>:LOWer? . . . . . . . . . . . . . . . . . . . . . . . . . 87
8.2.1.37 ALARm:TEMPurature<chn>:LOWer:ENABle? . . . . . . . . . . . . . . . . . . . . 87
8.2.1.38 ALARm:TEMPurature<chn>:LOWer:ENABle <bool> . . . . . . . . . . . . . . . . 87
8.2.1.39 ALARm:TEMPurature<chn>:LOWer:LIMit? [MIN|MAX|DEF] . . . . . . . . . . . 88
8.2.1.40 ALARm:TEMPurature<chn>:LOWer:LIMit <float>|MIN|MAX|DEF . . . . . . . . 88
8.2.1.41 ALARm:TEMPurature<chn>:RATE? . . . . . . . . . . . . . . . . . . . . . . . . . 88
8.2.1.42 ALARm:TEMPurature<chn>:RATE:ENABle? . . . . . . . . . . . . . . . . . . . . 88
8.2.1.43 ALARm:TEMPurature<chn>:RATE:ENABle <bool>. . . . . . . . . . . . . . . . . 89
8.2.1.44 ALARm:TEMPurature<chn>:RATE:LIMit? [MIN|MAX|DEF]. . . . . . . . . . . . 89
8.2.1.45 ALARm:TEMPurature<chn>:RATE:LIMit <float>|MIN|MAX|DEF . . . . . . . . . 89
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8.2.1.46 ALARm:TEMPurature<chn>:SENSor? . . . . . . . . . . . . . . . . . . . . . . . . 89
8.2.1.47 ALARm:TEMPurature<chn>:SENSor:ENABle? . . . . . . . . . . . . . . . . . . . 90
8.2.1.48 ALARm:TEMPurature<chn>:SENSor:ENABle <bool>. . . . . . . . . . . . . . . . 90
8.2.1.49 ALARm:TEMPurature<chn>:UPPer? . . . . . . . . . . . . . . . . . . . . . . . . . 90
8.2.1.50 ALARm:TEMPurature<chn>:UPPer:ENABle? . . . . . . . . . . . . . . . . . . . . 90
8.2.1.51 ALARm:TEMPurature<chn>:UPPer:ENABle <bool> . . . . . . . . . . . . . . . . 90
8.2.1.52 ALARm:TEMPurature<chn>:UPPer:LIMit? [MIN|MAX|DEF] . . . . . . . . . . . 91
8.2.1.53 ALARm:TEMPurature<chn>:UPPer:LIMit <float>|MIN|MAX|DEF. . . . . . . . . 91
8.2.1.54 ALARm:TIME:FIRSt? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
8.2.1.55 ALARm:TIME:LAST?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
8.2.2 Measurement Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
8.2.2.1 CALCulate:AVERage:CLEar. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
8.2.2.2 CALCulate<chn>:DEWPoint? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
8.2.2.3 CALCulate<chn>:HINDex? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
8.2.2.4 CALCulate<chn>:PARameter<num>:AVERage<type>? . . . . . . . . . . . . . . . 92
8.2.2.5 CALCulate[<chn>]:PARameter[<num>]:AVERage[<type>]:CLEar . . . . . . . . . 92
8.2.2.6 CALCulate[<chn>]:PARameter[<num>]:AVERage[<type>]:DATA? . . . . . . . . . 93
8.2.2.7 CALCulate[<chn>]:PARameter<num>:AVERage<type>:TYPE?. . . . . . . . . . . 93
8.2.2.8 CALCulate<chn>:PARameter<num>:RATE? . . . . . . . . . . . . . . . . . . . . . 93
8.2.2.9 CALCulate[<chn>]:PARameter[<num>]:RATE:TIME? [MIN|MAX|DEF]. . . . . . 93
8.2.2.10 CALCulate[<chn>]:PARameter[<num>]:RATE:TIME <num>|MIN|MAX|DEF . . . 93
8.2.2.11 CALCulate[<chn>]:PARameter<num>:RESolution? [MIN|MAX|DEF] . . . . . . . 94
8.2.2.12 CALCulate[<chn>]:PARameter<num>:RESolution <num>|MIN|MAX|DEF. . . . . 94
8.2.2.13 FETCh? [<chn>] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .94
8.2.2.14 FORMat:TDST:STATe? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
8.2.2.15 FORMat:TDST:STATe <bool> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
8.2.2.16 MEASure? [<chn>] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
8.2.2.17 READ? [<chn>]. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
8.2.3 Data Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
8.2.3.1 DATa:DSTatistics:ENABle? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
8.2.3.2 DATa:DSTatistics:ENABle <bool>. . . . . . . . . . . . . . . . . . . . . . . . . . . 96
8.2.3.3 DATa:DSTatistics:HOUR? [MIN|MAX|DEF] . . . . . . . . . . . . . . . . . . . . . 97
8.2.3.4 DATa:DSTatistics:HOUR <num>|MIN|MAX|DEF . . . . . . . . . . . . . . . . . . 97
8.2.3.5 DATa:DSTatistics:RENable? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
8.2.3.6 DATa:DSTatistics:RENable <bool> . . . . . . . . . . . . . . . . . . . . . . . . . . 97
8.2.3.7 DATa:DSTatistics:RHOur? [MIN|MAX|DEF] . . . . . . . . . . . . . . . . . . . . . 97
8.2.3.8 DATa:DSTatistics:RHOur <num>|MIN|MAX|DEF . . . . . . . . . . . . . . . . . . 98
8.2.3.9 DATa:DSTatistics:RECord:BTIMe? [<num>] . . . . . . . . . . . . . . . . . . . . . 98
8.2.3.10 DATa:DSTatistics:RECord:CLEar . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
8.2.3.11 DATa:DSTatistics:RECord:COUNt? [<MAX>] . . . . . . . . . . . . . . . . . . . . 98
8.2.3.12 DATa:DSTatistics:RECord:DATE? [<num>]. . . . . . . . . . . . . . . . . . . . . . 98
8.2.3.13 DATa:DSTatistics:RECord:ETIMe? [<num>] . . . . . . . . . . . . . . . . . . . . . 99
8.2.3.14 DATa:DSTatistics:RECord:FIND? (<year>,<month>,<day>) . . . . . . . . . . . . . 99
8.2.3.15 DATa:DSTatistics:RECord:VALue? <num>,<chn>,<type> . . . . . . . . . . . . . . 99
8.2.3.16 DATa:RECord:CLEar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
8.2.3.17 DATa:RECord:FEED:RHUMidity<chn>? . . . . . . . . . . . . . . . . . . . . . . . 99
8.2.3.18 DATa:RECord:FEED:RHUMidity<chn> <bool> . . . . . . . . . . . . . . . . . . . 100
8.2.3.19 DATa:RECord:FEED:TEMPerature<chn>? . . . . . . . . . . . . . . . . . . . . . 100
8.2.3.20 DATa:RECord:FEED:TEMPerature<num> <bool> . . . . . . . . . . . . . . . . . 100
8.2.3.21 DATa:RECord:FREE? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
8.2.3.22 DATa:RECord:OPEN? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
8.2.3.23 DATa:RECord:OPEN [(<year>,<month>,<day>,<hour>,<minute>,<sec
ond>)[,(<year>,<month>,<day>,<hour>,<minute>,<second>)]] . . . . . . . . . . . . . . . . 101
8.2.3.24 DATa:RECord:READ? [<num>] . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
8.2.3.25 DATa:RECord:TIME? [MIN|MAX|DEF] . . . . . . . . . . . . . . . . . . . . . . . 102
8.2.3.26 DATa:RECord:TIME <num>|MIN|MAX|DEF . . . . . . . . . . . . . . . . . . . . 102
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8.2.4 Measurement Control Commands. . . . . . . . . . . . . . . . . . . . . . . 102
8.2.4.1 INITiate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
8.2.4.2 INITiate:CONTinuous? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
8.2.4.3 SENSor:AVERage? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
8.2.4.4 SENSor:AVERage <bool> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
8.2.4.5 SENSor<chn>:LOCK? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
8.2.4.6 SENSor<chn>:LOCK <bool>. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
8.2.4.7 SENSor<chn>:IDENtification? . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
iv
8.2.4.8 SENSor<chn>:IDENtification <str> . . . . . . . . . . . . . . . . . . . . . . . . . 103
8.2.4.9 SENSor<chn>:STATe? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
8.2.4.10 TRIGger:TIMer? [MIN|MAX|DEF] . . . . . . . . . . . . . . . . . . . . . . . . . 104
8.2.4.11 TRIGger:TIMer <num>|MIN|MAX|DEF. . . . . . . . . . . . . . . . . . . . . . . 104
8.2.5 Channel Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
8.2.5.1 ROUTe:CLOSe? <chn> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
8.2.5.2 ROUTe:CLOSe <chn> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
8.2.5.3 ROUTe:OPEN? <chn> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
8.2.5.4 ROUTe:OPEN <chn> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
8.2.6 Calibration Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
8.2.6.1 CALibrate<chn>:ALERt? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
8.2.6.2 CALibrate<chn>:ALERt <bool> . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
8.2.6.3 CALibrate<chn>:DATE:CALibrate? . . . . . . . . . . . . . . . . . . . . . . . . . 106
8.2.6.4 CALibrate<chn>:DATE:CALibrate (<year>,<month>,<day>). . . . . . . . . . . . 106
8.2.6.5 CALibrate<chn>:DATE:DUE? . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
8.2.6.6 CALibrate<chn>:DATE:DUE (<year>,<month>,<day>). . . . . . . . . . . . . . . 107
8.2.6.7 CALibrate<chn>:EXPired? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
8.2.6.8 CALibrate<chn>:PARameter:OFFSet<num>? . . . . . . . . . . . . . . . . . . . . 107
8.2.6.9 CALibrate<chn>:PARameter:OFFSet<num> <float> . . . . . . . . . . . . . . . . 107
8.2.6.10 CALibrate<chn>:PARameter:SCALe<num>? . . . . . . . . . . . . . . . . . . . . 107
8.2.6.11 CALibrate<chn>:PARameter:SCALe<num> <float> . . . . . . . . . . . . . . . . 108
8.2.7 System Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
8.2.7.1 *IDN? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
8.2.7.2 *OPT? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
8.2.7.3 *RST. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
8.2.7.4 SYSTem:BEEP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
8.2.7.5 SYSTem:BOOT:VERSion? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
8.2.7.6 SYSTem:ERRor? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
8.2.7.7 SYSTem:CODE:VERSion? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
8.2.7.8 SYSTem:VERSion? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
8.2.7.9 UNIT:TEMPerature? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
8.2.7.10 UNIT:TEMPerature <unit> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
8.2.8 Communication Interface Commands. . . . . . . . . . . . . . . . . . . . . 110
8.2.8.1 SYSTem:COMMunicate:RADio:CHANnel? . . . . . . . . . . . . . . . . . . . . . 110
8.2.8.2 SYSTem:COMMunicate:RADio:CHANnel <num> . . . . . . . . . . . . . . . . . 110
8.2.8.3 SYSTem:COMMunicate:RADio:ENABle?. . . . . . . . . . . . . . . . . . . . . . 110
8.2.8.4 SYSTem:COMMunicate:RADio:ENABle <bool> . . . . . . . . . . . . . . . . . . 110
8.2.8.5 SYSTem:COMMunicate:RADio:INSTrument? . . . . . . . . . . . . . . . . . . . 110
8.2.8.6 SYSTem:COMMunicate:RADio:INSTrument <num> . . . . . . . . . . . . . . . . 110
8.2.8.7 SYSTem:COMMunicate:RADio:MODem? . . . . . . . . . . . . . . . . . . . . . 110
8.2.8.8 SYSTem:COMMunicate:RADio:MODem <num> . . . . . . . . . . . . . . . . . . 110
8.2.8.9 SYSTem:COMMunicate:RADio:OPTion? . . . . . . . . . . . . . . . . . . . . . . 111
8.2.8.10 SYSTem:COMMunicate:RADio:PAN?. . . . . . . . . . . . . . . . . . . . . . . . 111
8.2.8.11 SYSTem:COMMunicate:RADio:PAN <num> . . . . . . . . . . . . . . . . . . . . 111
8.2.8.12 SYSTem:COMMunicate:RADio:SIGNal? . . . . . . . . . . . . . . . . . . . . . . 111
8.2.8.13 SYSTem:COMMunicate:RADio:SNUMber?. . . . . . . . . . . . . . . . . . . . . 111
8.2.8.14 SYSTem:COMMunicate:SERial:BAUD? [MIN|MAX|DEF]. . . . . . . . . . . . . 111
8.2.8.15 SYSTem:COMMunicate:SERial:BAUD <baud>|MIN|MAX|DEF. . . . . . . . . . 111
8.2.8.16 SYSTem:COMMunicate:SERial:FDUPlex? . . . . . . . . . . . . . . . . . . . . . 111
8.2.8.17 SYSTem:COMMunicate:SERial:FDUPlex <bool>. . . . . . . . . . . . . . . . . . 112
8.2.8.18 SYSTem:COMMunicate:SERial:FEED? . . . . . . . . . . . . . . . . . . . . . . . 112
8.2.8.19 SYSTem:COMMunicate:SERial:FEED <bool> . . . . . . . . . . . . . . . . . . . 112
8.2.8.20 SYSTem:COMMunicate:SERial:LINefeed? . . . . . . . . . . . . . . . . . . . . . 112
8.2.8.21 SYSTem:COMMunicate:SERial:LINefeed <bool> . . . . . . . . . . . . . . . . . 112
8.2.8.22 SYSTem:COMMunicate:SERial:TIMe? [MIN|MAX|DEF] . . . . . . . . . . . . . 112
8.2.8.23 SYSTem:COMMunicate:SERial:TIMe <num>|MIN|MAX|DEF . . . . . . . . . . 113
8.2.8.24 SYSTem:COMMunicate:SOCKet:ADDRess? . . . . . . . . . . . . . . . . . . . . 113
8.2.8.25 SYSTem:COMMunicate:SOCKet:ADDRess <addr> . . . . . . . . . . . . . . . . 113
8.2.8.26 SYSTem:COMMunicate:SOCKet:COMMand? . . . . . . . . . . . . . . . . . . . 113
8.2.8.27 SYSTem:COMMunicate:SOCKet:DHCP? . . . . . . . . . . . . . . . . . . . . . . 113
8.2.8.28 SYSTem:COMMunicate:SOCKet:DHCP <bool> . . . . . . . . . . . . . . . . . . 113
8.2.8.29 SYSTem:COMMunicate:SOCKet:ENABle? . . . . . . . . . . . . . . . . . . . . . 113
8.2.8.30 SYSTem:COMMunicate:SOCKet:ENABle <bool> . . . . . . . . . . . . . . . . . 113
8.2.8.31 SYSTem:COMMunicate:SOCKet:GATeway? . . . . . . . . . . . . . . . . . . . . 114
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8.2.8.32 SYSTem:COMMunicate:SOCKet:GATeway <addr>. . . . . . . . . . . . . . . . . 114
8.2.8.33 SYSTem:COMMunicate:SOCKet:HTML? . . . . . . . . . . . . . . . . . . . . . . 114
8.2.8.34 SYSTem:COMMunicate:SOCKet:MAC?. . . . . . . . . . . . . . . . . . . . . . . 114
8.2.8.35 SYSTem:COMMunicate:SOCKet:MASK? . . . . . . . . . . . . . . . . . . . . . . 114
8.2.8.36 SYSTem:COMMunicate:SOCKet:MASK <addr> . . . . . . . . . . . . . . . . . . 114
8.2.8.37 SYSTem:KLOCkout? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
8.2.8.38 SYSTem:KLOCkout <bool> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
8.2.8.39 SYSTem:POWer:BATTery? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
8.2.9 Date and Time Commands . . . . . . . . . . . . . . . . . . . . . . . . . . 115
8.2.9.1 SYSTem:DATE?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
8.2.9.2 SYSTem:DATE (<year>,<month>,<day>) . . . . . . . . . . . . . . . . . . . . . . 115
8.2.9.3 SYSTem:DATE:FORMat? [MIN|MAX|DEF] . . . . . . . . . . . . . . . . . . . . 115
8.2.9.4 SYSTem:DATE:FORMat <num>|MIN|MAX|DEF. . . . . . . . . . . . . . . . . . 115
8.2.9.5 SYSTem:DECimal:FORMat? [MIN|MAX|DEF]. . . . . . . . . . . . . . . . . . . 116
8.2.9.6 SYSTem:DECimal:FORMat <num>|MIN|MAX|DEF . . . . . . . . . . . . . . . . 116
8.2.9.7 SYSTem:TIME?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
8.2.9.8 SYSTem:TIME (<hour>,<minute>,<second>) . . . . . . . . . . . . . . . . . . . . 116
8.2.9.9 SYSTem:TIME:DAYLight? [MIN|MAX|DEF]. . . . . . . . . . . . . . . . . . . . 117
8.2.9.10 SYSTem:TIME:DAYLight <num>|MIN|MAX|DEF . . . . . . . . . . . . . . . . . 117
8.2.9.11 SYSTem:TIME:FORMat? [MIN|MAX|DEF] . . . . . . . . . . . . . . . . . . . . 117
8.2.9.12 SYSTem:TIME:FORMat <num>|MIN|MAX|DEF . . . . . . . . . . . . . . . . . . 117
8.2.10 Password Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
8.2.10.1 SYSTem:PASSword:ALARm? . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
8.2.10.2 SYSTem:PASSword:ALARm <bool> . . . . . . . . . . . . . . . . . . . . . . . . 118
8.2.10.3 SYSTem:PASSword:CDISable . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
8.2.10.4 SYSTem:PASSword:CENable <pass> . . . . . . . . . . . . . . . . . . . . . . . . 118
8.2.10.5 SYSTem:PASSword:CENable:STATe? . . . . . . . . . . . . . . . . . . . . . . . . 118
8.2.10.6 SYSTem:PASSword:COMM?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
8.2.10.7 SYSTem:PASSword:COMM <bool> . . . . . . . . . . . . . . . . . . . . . . . . . 119
8.2.10.8 SYSTem:PASSword:NEW <pass>|DEF . . . . . . . . . . . . . . . . . . . . . . . 119
8.2.10.9 SYSTem:PASSword:RECord? . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
8.2.10.10 SYSTem:PASSword:RECord <bool> . . . . . . . . . . . . . . . . . . . . . . . . . 119
8.2.10.11 SYSTem:PASSword:SENSor? . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
8.2.10.12 SYSTem:PASSword:SENSor <bool> . . . . . . . . . . . . . . . . . . . . . . . . . 120
8.2.10.13 SYSTem:PASSword:STATistics? . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
8.2.10.14 SYSTem:PASSword:STATistics <bool> . . . . . . . . . . . . . . . . . . . . . . . 120
8.2.10.15 SYSTem:PASSword:TIME? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
8.2.10.16 SYSTem:PASSword:TIME <bool> . . . . . . . . . . . . . . . . . . . . . . . . . . 120
8.2.11 Status Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
8.2.11.1 *CLS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
8.2.11.2 *ESE? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
8.2.11.3 *ESE <num>|MIN|MAX|DEF . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
8.2.11.4 *ESR? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
8.2.11.5 *SRE? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
8.2.11.6 *SRE <num>|MIN|MAX|DEF . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
8.2.11.7 *STB? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
8.2.11.8 *TST? [<bool>] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
8.2.11.9 STATus:ALARm? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
8.2.11.10 STATus:ALARm:CONDition? . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
8.2.11.11 STATus:ALARm:ENABle? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
8.2.11.12 STATus:ALARm:ENABle <num>|MIN|MAX|DEF . . . . . . . . . . . . . . . . . 126
8.2.11.13 STATus:MEASure? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
8.2.11.14 STATus:MEASure:CONDition? . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
8.2.11.15 STATus:MEASure:ENABle? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
8.2.11.16 STATus:MEASure:ENABle <num>|MIN|MAX|DEF . . . . . . . . . . . . . . . . 127
8.2.11.17 STATus:OPERation? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
8.2.11.18 STATus:OPERation:CONDition? . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
8.2.11.19 STATus:OPERation:ENABle? . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
8.2.11.20 STATus:OPERation:ENABle <num>|MIN|MAX|DEF . . . . . . . . . . . . . . . . 129
8.2.11.21 STATus:QUEStionable? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
8.2.11.22 STATus:QUEStionable:CONDition? . . . . . . . . . . . . . . . . . . . . . . . . . 130
8.2.11.23 STATus:QUEStionable:ENABle? . . . . . . . . . . . . . . . . . . . . . . . . . . 130
8.2.11.24 STATus:QUEStionable:ENABle <num>|MIN|MAX|DEF . . . . . . . . . . . . . . 130
8.2.12 Date and Time Formats . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
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9 Calibration Procedure . . . . . . . . . . . . . . . . . . . . . 133
9.1 Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
9.2 Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
9.3 Calibration Points . . . . . . . . . . . . . . . . . . . . . . . . . 133
9.4 Temperature and Humidity Measurement Errors . . . . . . . . . 134
9.5 Temperature and Humidity Adjustments . . . . . . . . . . . . . 135
10 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . 137
11 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . 139
11.1 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . 139
11.1.1 Incorrect temperature or humidity reading . . . . . . . . . . . . . . . . . . 139
11.1.2 Missing or Scattered Graph Data . . . . . . . . . . . . . . . . . . . . . . . 139
11.1.3 Blank screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
11.1.4 Error message at power up. . . . . . . . . . . . . . . . . . . . . . . . . . . 139
11.1.5 Self-Test Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
11.1.6 Start-up Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
11.1.7 Error Messages during Normal Operation. . . . . . . . . . . . . . . . . . . 141
11.2 Downloading Recorded Data . . . . . . . . . . . . . . . . . . . 141
11.3 CE Comments . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
11.3.1 EMC Directive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
11.3.1.1 Immunity Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
11.3.1.2 Emission Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143
11.3.2 Low Voltage Directive (Safety) . . . . . . . . . . . . . . . . . . . . . . . . 143
11.3.3 RF Certification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143
11.3.3.1 United States. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143
11.3.3.2 Canada . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144
11.3.3.3 Europe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144
11.4 Frequently Asked Questions . . . . . . . . . . . . . . . . . . . 144
vii
Figures
Figure 1 Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 2 Top Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 3 Right and Left Side View . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 4 Back Panel (RF option shown). . . . . . . . . . . . . . . . . . . . . . 17
Figure 5 Main Display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 6 Main Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 7 Channel Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Figure 8 Channel Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 9 Sensor ID. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Figure 10 Sensor Lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Figure 11 Sensor Cal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Figure 12 Sensor Channel Select . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Figure 13 Display Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Figure 14 Display Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Figure 15 Display Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Figure 16 Field Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Figure 17 Graph Scale . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Figure 18 Graph Scale , Select Zone . . . . . . . . . . . . . . . . . . . . . . . . 37
Figure 19 Display Reset. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Figure 20 Data Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Figure 21 Data Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Figure 22 Record Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Figure 23 Data View, Begin Time. . . . . . . . . . . . . . . . . . . . . . . . . . 42
Figure 24 Data View, Numeric Format . . . . . . . . . . . . . . . . . . . . . . . 42
Figure 25 Data Print. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Figure 26 Data Clear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Figure 27 Data Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Figure 28 Daily Stats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Figure 29 Stats Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Figure 30 Stats View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Figure 31 Stats Print . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Figure 32 Stats Clear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Figure 33 Stats Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Figure 34 Alarm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Figure 35 Alarm Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Figure 36 Sensor Alarm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Figure 37 System Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Figure 38 Alarm View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Figure 39 System Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Figure 40 System Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
viii
Figure 41 Date Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Figure 42 Comm Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Figure 43 Serial . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Figure 44 RF Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Figure 45 Lan Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Figure 46 Password . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Figure 47 System Info . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Figure 48 Serial Cable Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
ix
Tables
Table 1 International Electrical Symbols . . . . . . . . . . . . . . . . . . . . . 1
Table 2 Statistics Zone Field Types. . . . . . . . . . . . . . . . . . . . . . . . 34
Table 3 Approximate Data Storage Capacity . . . . . . . . . . . . . . . . . . . 41
Table 4 Alphabetical List Commands . . . . . . . . . . . . . . . . . . . . . . 72
Table 4 Alphabetical List Commands continued . . . . . . . . . . . . . . . . . 73
Table 4 Alphabetical List Commands continued . . . . . . . . . . . . . . . . . 74
Table 4 Alphabetical List Commands continued . . . . . . . . . . . . . . . . . 75
Table 4 Alphabetical List Commands continued . . . . . . . . . . . . . . . . . 76
Table 4 Alphabetical List Commands continued . . . . . . . . . . . . . . . . . 77
Table 4 Alphabetical List Commands continued . . . . . . . . . . . . . . . . . 78
x
1 Before You Start
1.1 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.
Table 1 International Electrical Symbols
Symbol Description
AC (Alternating Current)
AC-DC
1 Before You Start
Symbols Used
Battery
CE Complies with European Union Directives
DC (Direct Current)
Double Insulated
Electric Shock
Fuse
PE Ground
Hot Surface (Burn Hazard)
Read the User’s Manual (Important Information)
Off
On
1
1620A “DewK” Thermo-hygrometer
User’s Guide
Symbol Description
Canadian Standards Association
OVERVOLTAGE (Installation) CATEGORY II, Pollution Degree 2 per IEC1010-1 re
fers to the level of Impulse Withstand Voltage protection provided. Equipment of
OVERVOLTAGE CATEGORY II is energy-consuming equipment to be supplied from
the fixed installation. Examples include household, office, and laboratory appliances.
C-TIC Australian EMC Mark
The European Waste Electrical and Electronic Equipment (WEEE) Directive
(2002/96/EC) mark.
1.2 Safety Information
Use this instrument only as specified in this manual. Otherwise, the protection
provided by the instrument may be impaired.
The following definitions apply to the terms “Warning” and “Caution”.
• “Warning” identifies conditions and actions that may pose hazards to the
user.
• “Caution” identifies conditions and actions that may damage the instru-
ment being used.
-
1.2.1
Warnings
To avoid personal injury, follow these guidelines.
•
DO NOT use this unit in environments other than those listed in the
User's Guide.
•
Follow all safety guidelines listed in the User's Guide.
•
Calibration equipment should only be used by trained personnel.
•
The AC adapter can present safety concerns if misused or damaged. To
avoid the risk of electric shock or fire, do not use the AC adapter outdoors
or in a dusty, dirty, or wet environment. If the cord, case, or plug of the
adapter is damaged in any way, discontinue its use immediately and have
it replaced.
•
Never disassemble the AC adapter. Use only the AC adapter provided
with the instrument or equivalent adapter recommended by the manufac
turer of this instrument.
•
The AC adapter has circuits with high voltage inside that could present
danger of electrical shock or fire if exposed. If the AC adapter is damaged
in any way or becomes hot, discontinue its use immediately, disconnect it
from any AC supply, and have it replaced. Do not attempt to open, repair,
or continue using a damaged or defective AC adapter.
-
2
1 Before You Start
Authorized Service Centers
The instrument battery can present danger if not handled properly. To
•
avoid the risk of exposure to dangerous substances or explosion, immedi
ately remove the battery and discontinue use if it leaks or becomes dam
aged. Never allow the battery to be shorted, heated, punctured, or
dropped. If the instrument is physically damaged, immediately remove
the battery to insure that it does not become shorted. While removed from
the instrument, store the battery in a location so that it will not come into
contact with metal or fluids that might short circuit the battery and where
it is safe from excessive temperatures.
Used batteries must be disposed of properly. Check your local regulations
•
for additional information. Never dispose of batteries in fire which may
result in explosion with the possibility of personal injury or property dam
age.
-
-
-
1.2.2
Cautions
• If the instrument is dropped, struck, or handled in a way that causes inter-
nal or external physical damage, immediately unplug the AC adapter, remove the battery, discontinue use, and contact an Authorized Service
Center. Do not attempt to disassemble or repair the instrument, battery, or
AC adapter. Refer repairs or replacement components to an Authorized
Service Center.
• The instrument and sensors are sensitive and can be easily damaged. Al-
ways handle these devices with care. DO NOT allow them to be dropped,
struck, stressed, or overheated.
• Sensors are fragile devices which can be damaged by mechanical shock,
overheating, and exposure to fluids. Damage may not be visibly apparent
but can cause drift, instability, and loss of accuracy. Observe the following
precautions:
• DO NOT allow sensors to be dropped, struck, or stressed.
•
DO NOT overheat sensors beyond their recommended temperature range.
•
Keep the sensors clean and away from fluids and dust.
1.3 Authorized Service Centers
Please contact one of the following authorized Service Centers to coordinate
service on your Hart product:
Fluke Corporation, Hart Scientific Division
799 E. Utah Valley Drive
American Fork, UT 84003-9775
USA
Phone: +1.801.763.1600
3
1620A “DewK” Thermo-hygrometer
User’s Guide
Telefax: +1.801.763.1010
E-mail: support@hartscientific.com
Fluke Nederland B.V.
Customer Support Services
Science Park Eindhoven 5108
5692 EC Son
NETHERLANDS
Phone: +31-402-675300
Telefax: +31-402-675321
E-mail: ServiceDesk@fluke.nl
Fluke Int'l Corporation
Service Center - Instrimpex
Room 2301 Sciteck Tower
22 Jianguomenwai Dajie
Chao Yang District
Beijing 100004, PRC
CHINA
Phone: +86-10-6-512-3436
Telefax: +86-10-6-512-3437
E-mail: xingye.han@fluke.com.cn
Fluke South East Asia Pte Ltd.
Fluke ASEAN Regional Office
Service Center
60 Alexandra Terrace #03-16
The Comtech (Lobby D)
118502
SINGAPORE
Phone: +65 6799-5588
Telefax: +65 6799-5588
E-mail: antng@singa.fluke.com
When contacting these Service Centers for support, please have the following
information available:
4
Model Number
•
Serial Number
•
Voltage
•
Complete description of the problem
•
1 Before You Start
Authorized Service Centers
5
2 Introduction
Fluke’s Hart Scientific Division’s 1620A is a low-cost, high-accuracy, digital
thermo-hygrometer. Its unique combination of features makes it suitable for a
wide variety of applications from laboratory to industrial ambient measure
ment. 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 tempera
•
ture and relative humidity; each is detachable, cable-extendable, and inter
changeable, 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
2 Introduction
-
-
-
• 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 out-
put 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, numeri-
cally, and statistically; 16 pre-defined, user-changeable screen setups
•
Power 12 VDC from external 110-240 VAC to DC converter
•
Uses a standard 9V battery backup to allow continued measuring during
power interruptions
7
3 Specifications and Environmental Conditions
3 Specifications and Environmental
Conditions
3.1 Specifications
Temperature Range 0°C to 50°C
Temperature Accuracy
(“H” Model)
16°C to 24°C (60.8°F to 75.2°F): ±0.125°C (±0.225°F) [calibrated]
0°C to 16°C (32°F to 60.8°F): ±0.5°C (±0.9°F) [uncalibrated typical]
24°C to 50°C (75.2°F to 122°F): ±0.5°C (±0.9°F) [uncalibrated typical]
Specifications
Temperature Accuracy
(“S” Model)
Delta Temperature
Accuracy
Temperature Display
Resolution
RH Range 0% to 100% RH
RH Accuracy
(“H” Model)
RH Accuracy
(“S” Model)
Delta Humidity
Accuracy
RH Display Resolution User selectable up to 0.01% (0.1% recorded)
Inputs Two sensors, each measuring temperature and relative humidity; each is de
Display 240 x 128 graphics monochrome LCD, displays temperature and humidity data
Memory 400,000 typical individual time-stamped readings
15°C to 35°C (59°F to 95°F): ±0.25°C (±0.45°F) [calibrated]
0°C to 15°C (32°F to 59°F): ±0.5°C (±0.9°F) [uncalibrated typical]
35°C to 50°C (95°F to 122°F): ±0.5°C (±0.9°F) [uncalibrated typical]
±0.025°C (±0.045°F) for ±1°C (±1.8°F)
changes within 15°C to 35°C (59°F to 95°F)
User selectable up to 0.001°C (0.01°C recorded)
20% to 70% RH: ±1.5% RH (calibrated)
0% to 20% RH, 70% to 100% RH: ±3% RH (uncalibrated, typical)
20% to 70% RH: ±2% RH (calibrated)
0% to 20% RH, 70% to 100% RH: ±3% RH (uncalibrated, typical)
±1.0% for ±5% changes within 20% to 70% RH
tachable, cable-extendable, and interchangeable, with self-contained calibration; each may be assigned a unique 16-character identification
graphically, numerically, and statistically; 16 pre-defined, user-changeable
screen set-ups are included
Alarms Visual and audio alarms for temperature, temperature rate, RH, RH rate, and
fault conditions
Alarm port output 0 V normal, 11 to 12 V active, sources up to 20mA, 2.5mm, two-conductor sub
miniature plug
Communications RS-232, Ethernet LAN, 802.15.4 (ZigBee) wireless (optional)
Ethernet 10 Base-T, 100 Base-TX, IP, TCP, DHCP, Ping, HTTP, HTML
Wireless Range 30 m (100 ft) typical unobstructed
Enclosure The DewK may be wall-mounted (hardware included) or set on a benchtop
Power 12 V DC from external 100-240 V AC power supply
Battery Backup Standard 9V battery to allow continued measuring during power disruptions
Operating Range 0°C to 50°C
-
9
1620A “DewK” Thermo-hygrometer
User’s Guide
Size (DewK)HxWxD 125 x 211 x 51 mm (4.9 x 8.3 x 2.0 in)
Size (Probes) 79 mm H x 19 mm dia. (3.1 x 0.75 in)
Weight 0.7kg(1.5lb.)
3.2 Environmental Conditions
Although the instrument has been designed for optimum durability and trou
ble-free operation, it must be handled with care. The instrument should not be
operated in an excessively dusty, dirty, or wet environment. Maintenance and
cleaning recommendations can be found in the Maintenance section of this
manual.
For full accuracy, operate the instrument within the calibrated temperature
•
and relative humidity range of the sensors.
1620A DewK
Operating Temperature: 0°C to 50°C (32°F to 122°F)
•
• Relative Humidity: 0% to 70% RH
2626-H/S
• Operating Temperature: 0°C to 50°C (32°F to 122°F)
• Relative Humidity: 0% to 100% RH
AC Adapter
• Operating Temperature: 0°C to 40°C (32°F to 104°F)
• Relative Humidity: 5% to 90% non-condensing de-rating from 40°C lin-
early to 50% at 70°C
10
General to all
•
Pressure: 75 kPa-106 kPa
•
Vibration should be minimized
•
Altitude less than 2,000 meters
•
Indoor use only
4 Quick Start
This section briefly explains the basics of setting up and operating your
thermo-hygrometer.
4.1 Unpacking
Carefully unpack the thermo-hygrometer and inspect the instrument to make
sure all components are present and in satisfactory condition. Verify that the
following items are present:
1620A Thermo-Hygrometer
•
AC adapter and power cord
•
• Serial cable
• Manual
• Report of calibration
4 Quick Start
Unpacking
• Wall mount bracket
• Sensor
• 9V battery
If all items are not present, call your Hart Scientific Authorized Service Center.
See Section 1.3.
4.2 Use Proper Care
First and most important is to understand the safety issues related to the
thermo-hygrometer. Carefully read Section 1.2, Safety Information.
The thermo-hygrometer and sensors used with it are sensitive instruments that
can be easily damaged. Always handle these devices with care. DO NOT allow
them to be dropped, struck, stressed, or over-heated.
4.3 Learn About the Features and Components
Familiarize yourself with the features and accessories of the thermo-hygrome
ter by reading Section 5, Parts and Controls.
-
4.4 Install the Battery
To maintain uninterrupted measurement when power outages occur, you must
install the included battery into the rear battery compartment. A standard 9V al
kaline battery (NEDA 1604A or IEC 6LR61) is recommended. With a fresh al
kaline battery installed, the thermo-hygrometer will continue to measure and
record temperature and relative humidity during a power outage for up to 16
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11
1620A “DewK” Thermo-hygrometer
User’s Guide
hours, typically. However, without external power, the display will be
inoperable.
4.5 Connect the Sensor
The sensor for channel 1 connects to the socket at the top-right, and the sensor
for channel 2, if used, connects to the socket on the right side. Either sensor
may be used with an optional extension cable up to 100 feet (30 meters) in
length.
4.6 Connect the Power Source
The thermo-hygrometer draws power from the provided power adapter. Plug
the adapter into a wall outlet of the appropriate voltage and insert the DC plug
into the DC power input of the thermo-hygrometer.
4.7 Switch the Power On
Power is turned on and off with the power switch located below the stand on
the back panel. To switch the power on, toggle the power switch to the ‘ ’
position. To switch power off, toggle the power switch to the ‘ ’ position.
The instrument takes a few seconds to power up, initialize, and begin normal
operation. A self-test is performed, displaying the channel configuration and
status of the system, calibration, % battery power, memory, and buttons. If the
thermo-hygrometer calibration has expired and the alert message is enabled, the
user is notified and must press the Enter button to continue initialization. If an
error message is displayed on power up see Section 11, Troubleshooting.
4.8 Measure Temperature
After initialization, the temperature and relative humidity measurements for the
enabled channels are displayed. If recording is enabled, the measurements will
be automatically stored in memory. The display can be configured to display
the measurements in a variety of numerical and graphical formats. For informa
tion on the various modes of operation of the thermo-hygrometer, see Section
7, Menu Functions.
-
12
5 Parts and Controls
The functions of the various features of the thermo-hygrometer are described
below.
5.1 Front Panel
The front panel buttons Enter/Menu, Up/Down/Left/Right Arrows, and Exit are
used to select and alter the functions of the thermo-hygrometer (see Figure 1).
5 Parts and Controls
Front Panel
Figure 1 Front Panel
The buttons have different functions depending on whether the main screen or
the menu system is displayed.
The functions of each of the buttons from the main screen are as follows:
Enter/Menu - This button is used to display the menu options.
Exit - This button is used to display the alarm window. With the alarm window
displayed the Exit button can be used to return to the main screen while preserving the alarm eve
events and return to the main screen.
lr - These buttons are used to move among enabled display layouts.
ud - These buttons are used to adjust the display contrast, u fordarkerand
d for lighter.
The functions of each of the buttons within the menu system are as follows:
nts or the Enter button can be used to clear the alarm
13
1620A “DewK” Thermo-hygrometer
User’s Guide
Enter/Menu - This button is used to select a menu item, to accept a choice, or
save changes to a parameter.
Exit - This button is used to return from a menu or window or cancel changes
to a parameter. Pressing the Exit button for a second or so returns from most
any menu, menu function, or window back to the main screen.
ud - These buttons are used to move among menu items or parameters.
When editing some numeric or alpha-numeric parameters, these buttons are
used to change a digit or character.
lr - These buttons are used to change a value or option when editing a pa
rameter. When editing some numeric or alpha-numeric parameters, these but
tons are used to move among digits or characters.
5.2 Top Panel
The top panel contains the port for attaching the sensor for Channel 1. An optional extension cable may be used to allow the sensor to be placed in a remote
location.
Figure 2 Top Panel
-
-
14
5.3 Right Side Panel
The right side panel contains the port for attaching the sensor for Channel 2.
5 Parts and Controls
Left Side Panel
An optional extension cable may be used to allow the sensor to be placed in a
remote location.
Figure 3 Right and Left Side View
5.4 Left Side Panel
The left side panel consists of, from top to bottom, the RS-232 port, Ethernet
LAN port, alarm port, and DC power socket.
RS-232 Port - The RS-232 port can be used to connect the instrument to a com
puter and remotely control and retrieve data from the instrument using a serial
RS-232 interface (see Sections 7.5.3.1 and 8). The jack accepts a 3.5 mm min
iature stereo plug.
LAN Port - This RJ45 socket allows the instrument to be connected to an
Ethernet IP computer network to remotely control and retrieve data from the in
strument (see Sections 7.5.3.3 and 8). The port has two LED indicators. The
-
-
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15
1620A “DewK” Thermo-hygrometer
User’s Guide
bottom LED indicates link state: off for no connection, amber for 10 Mbps, and
green for 100 Mbps. The top LED indicates link activity: off for no activity,
amber for half duplex, and green for full duplex.
Alarm Port - The alarm port allows external alarm indicators to be connected to
the instrument and activated when an alarm event occurs (see Section 7.4.1).
The port outputs 0V when inactive and 12V DC (up to 20 mA) when active.
The jack accepts a 2.5 mm two-conductor subminature plug (Switchcraft
#850). The sleeve of the plug is ground and the tip is positive.
DC Power Socket - The DC plug from the AC adapter plugs into the 12V DC
power socket to power the instrument. The jack accepts a 5.5 mm miniature
power plug (Switchcraft #S760). The outer conductor is ground and the inner
conductor is positive. The instrument may draw up to 0.5A.
5.5 Back Panel
The back panel contains the stand, power switch, battery compartment, and
product information, including serial number.
Stand - The stand can be used to prop up the thermo-hygrometer on a flat
surface.
Battery Compartment - The battery compartment holds a 9V alkaline battery
used as a backup power source to maintain continuous measurement during a
power outage (see Section 6.2, Battery).
Power Switch - The power switch turns the power on and off to the thermo-hygrometer, including power from the battery. Before disconnecting the AC
adapter from the instrument, switch the power off to prevent draining the
backup battery.
16
5 Parts and Controls
Quick Buttons
Serial Label - The serial label shows the instrument model and serial number.
Figure 4 Back Panel (RF option shown)
5.6 Quick Buttons
When the main screen is displayed, the buttons have the following functions:
Enter/Menu - This button is used to display the menu options.
Exit - This button is used to display the alarm window. With the alarm window
displayed the Exit button can be used to return to the main screen while preserving the alarm events or the Enter button can be used to clear the alarm
events and return to the main screen.
lr - These buttons are used to move among enabled display layouts.
ud - These buttons are used to adjust the display contrast, u fordarkerand
d for lighter.
5.7 Configurations
•
Model 1620A-H includes a 1620A-H Thermo-Hygrometer readout, a
high accuracy sensor (Model 2626-H), a thermo-hygrometer readout wall
mount bracket, power supply (Model 2361), and an RS-232 cable.
•
Model 1620A-S includes a 1620A-S Thermo-Hygrometer readout, a stan
dard accuracy sensor (Model 2626-S), a thermo-hygrometer readout wall
mount bracket, power supply (Model 2361), and an RS-232 cable.
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1620A “DewK” Thermo-hygrometer
User’s Guide
5.8 Accessories
The following accessories are available to compliment either the high accuracy
or standard thermo-hygrometer readout.
2626-S Spare Sensor/Standard Accuracy
•
2627-S Spare Sensor Kit includes a standard accuracy probe (2626-S),
•
sensor case (2607), sensor wall mount bracket (2630), and 25-foot (7.6 m)
extension cable (2628)
2626-H Spare Sensor/High Accuracy
•
2627-H Spare sensor Kit includes a high accuracy sensor (2626-H), sen
•
sor case (2607), sensor wall mount bracket (2630), and 25-foot (7.6 m)
extension cable (2628)
2607 Spare Sensor Protective Case
•
• 2628 Extension cable, 25-foot (7.6 m)
2629 Extension cable, 50-foot (15.2 m)
•
-
• 2630 Sensor wall mount bracket
• 9328 Protective Case (includes space for a 1620A Thermo-Hygrometer,
two sensors, RS-232 cable, and power cord)
• 2361 Spare Power Supply, 100-240 VAC to 12 VDC
• 9936A LogWare III, single-PC license
• 9936A-L1 License, LogWare III, 1-pack
• 9936A-L5 License, LogWare III, 5-pack
• 9936A-L10 License, LogWare III, 10-pack
• 9936A-LST License, LogWare III, site
• 9936A-UPG Software, 9936A Upgrade from v1.X
•
2633-RF Option, Factory Installed Wireless, Dewk (Model 2633-USB or
Model 2633-232 receiver required to communicate with this option)
•
2633-USB Receiver, USB to wireless (requires 2633-RF)
•
2633-232 Receiver, RS-232 to wireless (requires 2633-RF)
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