Series 3700
Plug-in Cards for Series 3700 Mainframes
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SWITCHING AND CONTROL
Plug-in cards for Series 3700 mainframes
Series 3700
•
Multiplexer, matrix, and
I/O cards
•
Relay closures automatically
counted and stored in each
card’s onboard memory
•
Unlimited contact life with
solid-state relay (Model 3724)
Plug-in Cards for Series 3700 Mainframes
Specifications for Plug-In Cards
Additional Series 3700 cards are currently in development. For a current list of cards and specifications,
visit www.keithley.com.
3720
Page
No. of Channels
Card Config.
Type of Relay
4
60 (Dual 1×30)
Multiplexer
Latching
electromechanical
2 Form A
3721
6
40 (dual 1×20)
3722
8
96 (dual 1×48)
Multiplexer
Latching
electromechanical
2 Form A
300 V
1A
2 independent 1×48
multiplexers
Plug-in cards for Series 3700 mainframes
•
Automatic CJC for temperature
measurements when used
with screw terminal accessory
(Models 3720, 3721, 3724)
Ordering Information
3720 Dual 1×30 Multiplexer Card4
3721 Dual 1×20 Multiplexer Card6
3722 Dual 1×48, High Density,
Multiplexer Card . . . . . . . . .8
3723 Dual 1×30, High
Speed, Reed Relay,
Multiplexer Card . . . . . . . .10
3724 Dual 1×30 FET
Multiplexer Card . . . . . . . .12
3730 6×16, High Density,
Matrix Card . . . . . . . . . . . . 15
3731 6×16, High Speed, Reed
Relay, Matrix Card . . . . . . 17
3732 Quad 4×28, Ultra-High
Density, Reed Relay,
Matrix Card . . . . . . . . . . . .19
3740 General Purpose Card
with 32 Independent
Channels . . . . . . . . . . . . . .23
3750 Multifunction Control Card2
5
Contact Configuration
Max. Voltage
Max. Current Switched
Comments
Multiplexer
Latching
electromechanical
2 Form A
300 V (ch 1–40),
300 V
60 V (ch 41–42)
2 A (ch 1–40),
1A
3 A (ch 41–42)
2 independent 1×20
2 independent 1×30
multiplexers. Automatic multiplexers. Automatic
temperature reference temperature reference
when used with screw when used with screw
terminal accessory
terminal accessory
(Model 3721-ST)
(Model 3720-ST)
Plug-in Card Accessories
3720
Cables
3720-MTC-1.5,
3720-MTC-3
3720-ST
3791-KIT78-R
3791-CIT
3721
3721-MTC-1.5,
3721-MTC-3
3721-ST
3790-KIT50-R
3722
3722-MTC-1.5,
3722-MTC-1.5/MM,
3722-MTC-3,
3722-MTC-3/MM
SWITCHING AND CONTROL
Screw Terminal Block
Connector Kits
Tools
3792-KIT104-R,
3792-KIT104-R/F
3791-CIT
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2
Series 3700
Plug-in Cards for Series 3700 Mainframes
3723
10
60 (dual 1×30) or
120 single pole
(dual 1×60)
Multiplexer
Dry reed
1 Form A
200 V
1A
2 independent 1×30
multiplexers
3724
12
60 (dual 1×30)
Multiplexer
FET solid-state
2 Form A
200 V
0.1 A
2 independent
1×30 multiplexers.
Automatic
temperature
reference when used
with screw terminal
accessory (Model
3724-ST)
3730
15
6×16
Matrix
Latching
electromechanical
2 Form A
300 V
1A
Columns can be
expanded through
the backplane or
isolated by relays
3731
17
6×16
Matrix
Dry reed
2 Form A
200 V
1A
3732
19
448 crosspoints
(Quad 4×28)
Matrix
Dry reed
1 Form A
200 V
0.75 A
3740
23
32
Independent
Latching
electromechanical
28 Form C, 4 Form A
300 VDC/250 VAC
(Form A)
2 A (Form C), 7 A
(Form A)
32 general purpose
independent
channels.
3750
25
40 digital I/O, 4
counter/totalizers,
and 2 isolated analog
outputs
Independent
N/A
N/A
N/A
N/A
All-in-one card
design. 40
bidirectional
I/O. Four 32-bit
counter/totalizers.
2 programmable
analog (V or I)
outputs.
Banks can be
Relay actuation time
connected
of 0.5ms. Columns
together via bank
can be expanded
configuration relays
through the
backplane or isolated to create a single
4×112 or dual 4×56
by relays
matrix. Analog
backplane relays also
included for card
to card expansion.
Row expansion with
3732-ST-R accessory
to create a dual 8×28
or single 16×28
matrix.
3723
3720-MTC-1.5,
3720-MTC-3
3723-ST, 3723-ST-1
3791-KIT78-R
3791-CIT
3724
3720-MTC-1.5,
3720-MTC-3
3724-ST
3791-KIT78-R
3791-CIT
3730
3721-MTC-1.5,
3721-MTC-3
3730-ST
3790-KIT50-R
3731
3721-MTC-1.5,
3721-MTC-3
3731-ST
3790-KIT50-R
3732
3720-MTC-1.5,
3720-MTC-3
3732-ST-C, 3732-ST-R
3791-KIT78-R
3791-CIT
3740
3721-MTC-1.5,
3721-MTC-3
3740-ST
3790-KIT50-R
3750
3721-MTC-1.5,
3721-MTC-3
3790-KIT50-R
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SWITCHING AND CONTROL
3750-ST
Plug-in cards for Series 3700 mainframes
3720
•
60 two-pole channels or 30
four-pole channels for general
purpose switching
•
Automatic CJC for temperature
measurements when used with
3720-ST accessory
•
Analog backplane connection
relays provide easy bank and
card interconnections
Dual 1×30 Multiplexer Card
60 differential channels, automatic CJC w/3720-ST accessory
Dual 1×30 multiplexer card
•
300V, 1A switched or 2A carry
signal capacity; 60W, 125VA
•
Screw terminal connections
provided with removable
3720-ST accessory
•
Relay closures stored in
onboard memory
•
Latching electromechanical
relays
The Model 3720 offers two independent banks of 1×30 two-pole multiplexers. It is ideal for general
purpose switching, including temperature measurements. The two banks can automatically be
connected to the Series 3700 mainframe backplane and optional DMM through the analog backplane
connection relays. This connection allows the mainframe to reconfigure the card to a single 1×60
two-pole multiplexer or to enable card-to-card expansion for even larger configurations.
Other features of the Model 3720 include its ability to be reconfigured to coordinated four-pole
operation for additional measurement flexibility. Furthermore, the Model 3720 supports thermo-
couple-type temperature measurements when used with the Model 3720-ST (screw terminal)
accessory providing automatic cold junction compensation (CJC).
The Model 3720 uses two 78-pin male D-sub connectors for signal connections. For screw terminal
or automatic CJC, use the detachable Model 3720-ST accessory.
ACCESSORIES AVAILAbLE
SERVICES AVAILAbLE
3720-3Y-EW-STD 1-year factory warranty extended to 3 years
from date of shipment
3720-5Y-EW-STD 1-year factory warranty extended to 5 years
from date of shipment
C/3720-3Y-STD 3 (Z540-1 compliant) calibrations within 3 years
of purchase*
*Not available in all countries
Ordering Information
3720
Dual 1×30
Multiplexer Card
3720-MTC-1.5
3720-MTC-3
3720-ST
3791-CIT
3791-KIT78-R
7401
78 Pin D-sub Female to Male Cable, 1.5m (5 ft.)
78 Pin D-sub Female to Male Cable, 3m (10 ft.)
Screw Terminal Block (required for auto CJC
thermocouple measurements)
Contact Insertion and Extraction Tool
78 Pin Female D-sub Connector Kit (contains
2 female D-sub connectors and 156 solder-cup
contacts)
Type K Thermocouple Wire (100 ft.)
SWITCHING AND CONTROL
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4
3720
Dual 1×30 Multiplexer Card
60 differential channels, automatic CJC w/3720-ST accessory
MULTIPLEXER CONFIGURATION:
Two independent 1×30 2-pole multiplexers. Banks can be
isolated from the backplane by relays. Card can be configured for 2 and 4 wire.
CONTACT CONFIGURATION:
2 pole form A.
CONNECTOR TYPE:
Two 78 pin male D-shells.
MOdEL 3720-ST SCREw TERMINAL OPTION:
#22 AWG typical wire size with 0.062 inch O.D.
124 conductors maximum. #16 AWG maximum wire size with 0.092 inch O.D. 36 conductors
per card maximum.
MAXIMUM SIGNAL LEVEL: Channels 1–60:
300V DC or RMS, 1A switched (2A carry), 60W, 125VA.
COMMON MOdE VOLTAGE:
300V DC or RMS between any terminal and chassis.
VOLT-HERTZ LIMIT:
8×10
7
.
CONTACT LIFE:
>10
5
operations at maximum signal level. >10
8
operations no load.
1
Multiplexer Bank 1
Output 1
HI
LO
HI Analog
Backplane 1
LO (DMM Input)
HI Analog
Backplane 2
LO (DMM Sense)
HI Analog
LO Backplane 3
HI Analog
LO Backplane 4
HI Analog
LO Backplane 5
HI Analog
LO Backplane 6
Channel 1
HI
LO
Channels 2–29
Channel 30
HI
LO
10
9
W
, 250 pF
10
10
W
, 75 pF
10
9
W
, 75 pF
10
9
W
, 200 pF
<–60 dB
<–50 dB
<–25 dB
30 MHz
10
9
W
, 450 pF
—
10
9
W
, 75 pF
10
9
W
, 400 pF
<–55 dB
<–50 dB
<–20 dB
10 MHz
Multiplexer Bank 2
Output 2
HI
LO
HI Analog
Backplane 1
LO (DMM Input)
HI Analog
Backplane 2
LO (DMM Sense)
HI Analog
LO Backplane 3
HI Analog
LO Backplane 4
HI Analog
LO Backplane 5
HI Analog
LO Backplane 6
Channel 31
HI
LO
TYPICAL SCANNING SPEEdS:
Switch Only
4
:
Sequential scanning, single channel, immediate trigger advance: >120 ch/s.
with Measurements Into Memory
5
:
DCV (10V range) or 2W Ohms (1k
W
range): >110 ch/s.
Thermocouple: >110 ch/s.
3- or 4-Wire RTD: >100 ch/s.
4-Wire Ohms (1k
W
range): >100 ch/s.
ACV (10V range): >110 ch/s.
Channels 32–59
GENERAL
ACTUATION TIME:
4ms.
TEMPERATURE ACCURACY using Automatic CJC with 3720-ST accessory:
1°C for J, K, T
and E types (see mainframe specification for details).
RELAY TYPE:
Latching electromechanical.
RELAY dRIVE SCHEME:
Matrix.
INTERLOCK:
Backplane relays disabled when interlock connection is removed.
OPERATING ENVIRONMENT:
Specified for 0° to 50°C. Specified to 70% R.H. at 35°C.
STORAGE ENVIRONMENT:
–25° to 65°C.
wEIGHT:
2.5 lbs.
SAFETY:
Conforms to European Union Directive 73/23/EEC, EN61010-1.
EMC:
Conforms to European Union Directive 2004/108/EC, EN61326-1.
NOTES
Channel 60
HI
LO
Maximum Carrying Current for Pulses
20
Maximum Carrying Current (A)
10
1
0.1
1
10
100
Pulse Width (ms)
1000
10000
1. Model 3706 ambient temperature <28°C.
2. One shot repetition rate > 10 seconds.
3. Signal path routed only through one card (not through backplane).
4. Only one channel closed at a time.
5. Contact life specification unaffected if pulse width and carry current are not exceeded.
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5
SWITCHING AND CONTROL
100% duty
50% duty
25% duty
10% duty
5% duty
1 shot
1.
2.
3.
4.
5.
Open detector enabled during thermocouple measurements. Minimum signal level 10mV, 10μA.
3706 mainframe with all DMM backplane relays disconnected. Maximum two card backplane relays closed.
Connections made using 3720-ST accessory.
Scanning script local to 3706 mainframe, within same bank, and break before make switching.
3706 mainframe with autorange off, limits off, dmm.autozero=0, dmm.autodelay=0, 4½ digits (NPLC=0.006),
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.
Model 3720 specifications
Side Text
Channel Resistance (end of contact life)
Contact Potential (differential)
Offset Current
Isolation
differential
Bank-Bank
Channel-channel
Common Mode
Crosstalk Channel-channel
300kHz
1MHz
20MHz:
Bandwidth
Dual 1×30
3
<1.0
W
<±1 μV
<±250 pA
Single 1×60
2, 3
<1.5
W
<± 3 μV
<±250 pA
To Series 3700 Mainframe Analog Backplane
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