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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 3700A 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 thermocoupletype 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.
Key Features |
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 |
300 V, 1 A switched or 2 A carry signal capacity; 60 Ω, 125 VA |
Screw terminal connections provided with removable 3720-ST accessory |
Relay closures stored in onboard memory |
Latching electromechanical relays |
Specifications | |
3720 Dual 1×30 Multiplexer Card | |
Features | Parameters |
Actuation Time | 4ms |
Temperature Accuracy using Automatic CJC with 3720-ST Accessory | 1°C for J, K, T and E types |
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. |
Specifications | |
Series 3700A System Switch/Multimeter and Plug-In Cards | |
Model Overview | |
Model | Description |
Mainframes | |
3706A | Six-Slot System Switch with High Performance DMM |
3706A-NFP | Six-Slot System Switch with High Performance DMM, Without front panel display and keypad |
3706A-S | Six-Slot System Switch |
3706A-SNFP | Six-Slot System Switch Without front panel display and keypad |
Plug-in Cards | Description |
3720 | Dual 1×30 Multiplexer Card (Auto CJC when used with 3720-ST) |
3721 | Dual 1×20 Multiplexer Card (Auto CJC when used with 3721-ST) |
3722 | Dual 1×48, High Density, Multiplexer Card |
3723 | Dual 1×30, High Speed, Reed Relay Multiplexer Card |
3724 | Dual 1×30 FET Multiplexer Card |
3730 | 6×16, High Density, Matrix Card |
3731 | 6×16 High Speed, Reed Relay Matrix Card |
3732 | Quad 4×28, Ultra-High Density, Reed Relay Matrix Card |
3740 | 32 Channel Isolated Switch Card |
3750 | Multifunction Control Card |
3760 | 10-Channel High Current Multiplexer Card |
3761 | 10-Channel Low Current Multiplexer Card |
3762 | 10-Channel High Voltage Multiplexer Card |
3765 | Hall Effect Card |
Specifications | ||||||
Plug-in Cards for; Series 3700A Mainframes | ||||||
Model Overview | ||||||
Model | Channels | Card Configuration | Type of Relay | Contact Configuration | Max. Voltage | Max. Current Switched |
3720 | 60 (Dual 1×30) | Multiplexer | Latching electro mechanical | 2 Form A | 300 V | 1 A |
3721 | 40 (Dual 1×20) | Multiplexer | Latching electro mechanical | 2 Form A | 300 V (ch 1–40) 60 V (ch 41–42) | 2 A (ch 1–40) 3 A (ch 41–42) |
3722 | 96 (Dual 1×48) | Multiplexer | Latching electro mechanical | 2 Form A | 300 V | 1 A |
3723 | 60 (Dual 1×30) or 120 single-pole (Dual 1×60) | Multiplexer | Dry reed | 1 Form A | 200 V | 1 A |
3724 | 60 (Dual 1×30) | Multiplexer | FET solid-state | 2 Form A | 200 V | 0.1 A |
3730 | 6×16 | Matrix | Latching electro mechanical | 2 Form A | 300 V | 1 A |
3731 | 6×16 | Matrix | Dry reed | 2 Form A | 200 V | 1 A |
3732 | 448 crosspoints (Quad 4×28) | Matrix | Dry reed | 1 Form A | 200 V | 0.75 A |
3740 | 32 | Independent | Latching electro mechanical | 28 Form C 4 Form A | 300 VDC/250 VAC (Form A) | 2 A (Form C) 7 A (Form A) |
3750 | 40 digital I/O 4 counter/totalizers 2 isolated analog outputs | Independent | N/A | N/A | N/A | N/A |
3760 | 10 | Multiplexer | Non latching electro mechanical | 2 Form C | 500 V | 5 A |
3761 | 10 | Multiplexer | Dry reed | Form A | 30 V | 100 mA |
3762 | 10 | Multiplexer | Dry reed | 2 Form A | 1000 V | 0.5 A |
3765 | 4×5 | Matrix | Non latching electro mechanical and Dry reed | Form A | 8 V | 100 mA |
Specifications | |
Plug-in Cards for; Series 3700A Mainframes | |
Series Overview | |
Model | Comments |
3720 | 2 independent 1×30 multiplexers. Automatic temperature reference when used with screw terminal accessory (3720-ST) |
3721 | 2 independent 1×20 multiplexers. Automatic temperature reference when used with screw terminal accessory (3721-ST) |
3722 | 2 independent 1×48 multiplexers |
3723 | 2 independent 1×30 multiplexers |
3724 | 2 independent 1×30 multiplexers. Automatic temperature reference when used with screw terminal accessory (3724-ST) |
3730 | Columns can be expanded through the backplane or isolated by relays |
3731 | Relay actuation time of 0.5 ms. Columns can be expanded through the backplane or isolated by relays |
3732 | Banks can be connected together via bank configuration relays to create a single 4×112 or dual 4×56 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. |
3740 | 32 general purpose independent channels. |
3750 | All-in-one card design. 40 bidirectional I/O. Four 32- bit counter/totalizers. 2 programmable analog (V or I) outputs. |
3760 | Single 1×10 high current multiplexer |
3761 | Single 1×10 low current multiplexer |
3762 | Single 1×10 high voltage multiplexer |
3765 | Specialty 4×5 matrix for Hall Effect and van der Pauw measurements. |
Specifications | |
3720 Dual 1×30 Multiplexer Card | |
Accessories Available | |
Model Number | Description |
3720-MTC-1.5 | 78 Pin D-sub Female to Male Cable, 1.5m (5 ft.) |
3720-MTC-3 | 78 Pin D-sub Female to Male Cable, 3m (10 ft.) |
3720-ST | Screw Terminal Block (required for auto CJC thermocouple measurements) |
3791-CIT | Contact Insertion and Extraction Tool |
3791-KIT78-R | 78 Pin Female D-sub Connector Kit (contains 2 female D-sub connectors and 156 solder-cup contacts) |
7401 | Type K Thermocouple Wire (100 ft.) |