Datasheet

Datasheet
TEK.COM28
The 7700 plug-in module offers 20 channels of 2-pole or 10
channels of 4-pole multiplexer switching that can be configured as
two independent banks of multiplexers. There are two additional
protected channels for current measurements. Automatic CJC
is provided so that no other accessories are required to make
thermocouple temperature measurements. In addition, the 7700
contains latching electromechanical relays that enable signal
bandwidths of up to 50 MHz. The 7700 is ideal for RTD, thermistor,
and thermocouple temperature applications.
Key Features
• 20 channels for generalpurpose measurements, plus two
channels to measure current
• Oversize screw terminal connection blocks are standard for
easier connections
• 50 MHz bandwidth
• 300 V, 1 A capacity for voltage channels; 60 W, 125 VA
• 3 A capacity for current channels
• Low insertion loss of up to 50 MHz
• Relay closures stored in onboard memory
Series 7700 Plug-In Switch Modules
Cold Junction
Ref ×3
Cold Junction
Ref ×3
Channel 1
HI
LO
Channel
10
HI
LO
(Channels 2–9)
Channel 11
HI
LO
Channel 20
HI
LO
(Channels 12–19)
Channel 21
HI
LO
Channel 22
HI
LO
AMPS
HI
LO
Sense
HI
LO
Input
Channel 23
2-Pole (Open)
4-Pole (Closed)
(see Note)
3A
3A
To Instrument
Backplane
Channel 25 (see Note)
Backplane isolation
Channel 24 (see Note)
Backplane isolation
NOTE: Channels 23–25 in this schematic refer to
the designations used for control and not actual
available channels.
For more information, refer to the ROUTe:MULTiple
command section in the Instrument User’s Manual.
Channels 24 and 25 can be individually controlled
using ROUTe:MULTiple if the module is not to be
connected to the internal DMM.
Card
AMPS
LO
Card Sense
HI
LO
Card Input
HI
LO
7700 20-channel, Differential Multiplexer Module
with Automatic CJC, Screw Terminals, and up to 50MHz Bandwidth
Datasheet
Specifications
Capabilities
Channels 1–20 Multiplex one of twenty 2-pole or one of ten 4-pole signals into
DMM.
Channels 21–22 Multiplex one of two 2-pole current signals into DMM.
Inputs
Maximum Signal Level
Channels (1–20) 300 V DC or 300 V rms (425 V peak) for AC waveforms, 1 A
switched, 60 W, 125 VA maximum.
Channels (21–22) 60 V DC or 30 V rms, 3 A switched, 60 W, 125 VA maximum.
Contact Life (typ.) >10
5
operations at max. signal level. >10
8
operations no load
1
.
1. Open thermocouple detector on during thermocouple measurements. Minimum signal level
10 mV, 10 μA.
Contact Resistance <1 Ω at end of contact life.
Contact Potential <±500 nV typical per contact, 1 μV max. <±500 nV typical per
contact pair, 1 μV max.
Offset Current <100 pA.
Connector Type Screw terminal, #20 AWG wire size.
Isolation Between Any Two Terminals: >10
10
Ω, <100 pF.
Isolation Between Any Terminal and Earth: >10
9
Ω, <200 pF.
Insertion Loss (50 Ω Source, 50 Ω Load)
w/Internal DMM w/o Internal DMM*
<0.1 dB 1 MHz 1 MHz
<3 dB 2 MHz 50 MHz
Crosstalk (50 Ω Load):
w/Internal DMM w/o Internal DMM*
10 MHz <–40 dB <–40 dB
25 MHz ** <–25 dB
Common Mode Voltage
300 V or 300 V rms (425 V peak) for AC waveforms between
any terminal and chassis.
* Channels 24 and 25 are open. Refer to ROUTe:MULTiple command in 27XX User Manual.
** Not valid.
General
20 Channels 20 channels of 2-pole relay input. All channels configurable to
4-pole.
2 Channels 2 channels of current only input.
Relay Type Latching electromechanical.
Actuation Time <3 ms.
Environmental Operating Environment: Specified for 0° to 50°C. Specified
to 80% R.H. at 35°C.
Storage Environment: –25° to 65°C.
EMC: Conforms to European Union EMC Directive.
Safety: Conforms to European Union Low Voltage Directive
RoHS: Conforms to European Union RoHS Directive
Warranty: 1 year
Weight 0.45 kg (1 lb).
Supplied Accessories
CC-92-1 Set of 20 Cable Ties
TL-23 Screwdriver
Available Services
7700-3Y-EW 1-year factory warranty extended to 3 years from date of
shipment
Ordering Information
7700 20-channel, Differential Multiplexer Module with Automatic
CJC and Screw Terminals