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Features
High-density 300 V/2 amp multiplexing scanning (up to 432 2-wire channels in 1U
footprint)
Configure as 2 or 4-wire multiplexers under program control
Internal capacitive discharge relays keep high voltages from disturbing sensitive
measurement points
Supports thermocouple, RTD and thermistor measurements
Optional screw-terminal junction box includes built-in cold junction compensation
Direct measurement of current, up to 3 amps (3048 only)
Direct routing to DMM through internal analog measurement bus simplifies field wiring
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EX1200-3072 Datasheet
72 channel 2-wire 300 V/ 2 A Multiplexer
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Overview
The EX1200-3072 high-density multiplexer modules is designed for scanning of multiple points to a common bus, in either 2- or 4-wire configurations, either synchronously with the EX1200 system DMM scan function, or asynchronously as a system switch to other devices through LXI LAN messages or the hardware trigger bus. Up to 432 two-wire (or 216 four-wire) channels can be accommodated in a single EX1200 full rack mainframe for maximum density, or mixed and matched with other EX1200 plug-ins for flexibility. Applications include cable harness testing, semiconductor and PCB testing, and those in which multiple points need to be switched to a common resource. All relays also have individual control, and each path allows for hot switching of up to 300 V and 2 A (60 W dc max).
The EX1200-3072 consists of dual (1x36) multiplexer banks. Each bank can be interconnected within a module under program control (via bussing relays) to form a (1 x 72) 2-wire mux. The EX1200 analog bus can be used to configure larger multiplexers as required to eliminate external wiring and helps reduce unterminated stubs effects.
Internal residual voltage discharge relays can be enabled to momentarily short out the measurement path when changing from one input channel to the next. This dissipates any voltage held by the wiring and instrument input capacitance. These relays protect sensitive devices, such as CMOS circuits, from residual voltages caused by previous high-voltage measurements. This feature can also be disabled in low-voltage applications where maximum throughput speed is important.
An optional terminal block provides screw termination points for external field wiring. This terminal block also includes cold junction compensation reference for more precise temperature measurements.
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Specifications
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Channel Count
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(1 x 72) 2-wire, Dual (1 x 36) 2-wire, or (1 x 36) 4-wire
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Relay Type
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Electromechanical, Fail-safe
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Maximum Switching Voltage
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300 V AC, 300 V DC
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Maximum Switching Current
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2 A
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Maximum Switching Power
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60 W DC, 125 VA
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Path Resistance
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< 500 mΩ
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Insulation Resistance
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> 1x109 Ω
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Maximum Thermal Offset
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Per Channel (HI-LO)
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< 3 μV
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Capacitance
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Open Channel
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< 50 pF
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Channel-Mainframe
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< 20 pF
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High-Low
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< 50 pF
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Bandwidth (-3 dB), typical Crosstalk
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15 MHz
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1 MHz
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< -70 dB
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10 MHz
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< -50 dB
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Isolation
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1 MHz
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< -55 dB
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10 MHz
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< -35 dB
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Rated Switch Operations
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Mechanical
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1 x 108 (no load) |
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Electrical
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1 x 105 @ 50 V dc, 0.1 A resistive or 10 V dc, 10 mA (resistive)
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Switching Time
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< 3 ms
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Front Panel Connector
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160p DIN
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Ordering Information
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EX1200-3072
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72 channel, 300V/2A multiplexer
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| 70-0363-504 |
Strain relief bracket kit (includes connector – recommended accessory) |
| 70-0363-503 |
Strain relief bracket kit (no connector) |
| 52-0109-000 |
Crimp pin (includes 100 crimp pins) |
| 27-0088-160 |
Mating connector (one per board) |
| 46-0010-000 |
Crimp tool (DIN) |
| 46-0011-000 |
Extraction tool (DIN) |
| 70-0367-002 |
EX1200-TB160-1, differential module |
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