Keithley Instruments, Inc.
28775 Aurora Road
Cleveland, Ohio 44139
(440) 248-0400
www.keithely.com
Specifications are subject to change without notice.
Page 2 of 3 SPEC-3721 Rev. A / September 2007
Model 3721
Dual 1x20 Channel Multiplexer Specifications
40 differential channels, automatic CJC w/3721-ST accessory
GENERAL:
ACTUATION TIME: 4ms
TEMPERATURE ACCURACY USING Automatic CJC with 3721-ST accessory:
1ºC for J, K, T and E types (see mainframe specification for details)
RELAY TYPE: Latching electromechanical
RELAY DRIVE SCHEME: Direct
INTERLOCK: Backplane relays are disabled when interlock connection is removed.
OPERATING ENVIRONMENT:
Specified for 0ºC to 50ºC.
Specified to 70% R.H. at 35ºC
STORAGE ENVIRONMENT: -25ºC to 65ºC
WEIGHT: 2.25 lb
SAFETY: Conforms to European Union Directive 73/23/EEC, EN61010-1
EMC: Conforms to European Union Directive 2004/108/EC, EN61326-1
Typical Scanning Speeds, switch only
4
Ch/Sec
Sequential scanning ,single channel, immediate trigger advance >120
Typical Scanning Speeds, with measurements into memory
5
Ch/Sec
DCV (10V range) or 2W Ohms (1K range) >110
Thermocouple >110
3 or 4 Wire RTD >100
4 Wire Ohms (1k range) >100
ACV (10V, 400Hz range) or ACI (1A, 400Hz range) >110
4
Scanning script local to 3706 mainframe, within same bank, and break before make switching.
5
3706 mainframe with autorange off, limits off, dmm.autozero=0, dmm.autodelay=0, 4½ digits (NPLC=.006), for ACV
dmm.detectorbandwidth=300,for OHMs dmm.offsetcompensation=off, dmm.opendetector=off. Scanning script local to
mainframe, sequential scan within same bank (2 pole ) or card (4 pole), and break before make switching.
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