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Features
High-density 300 V/2 A multiplexing scanning (up to 288 two-wire channels in 1U footprint)
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 routing to DMM through internal analog measurement bus simplifies field wiring
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EX1200-3048 Datasheet
48 channel 1000 V Multiplexer
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Overview
The EX1200-3048 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 288 two-wire (or 144 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, temperature/voltage monitoring, 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). Two dedicated channels the capability to directly measure current up to 3 As.
The EX1200-3048 consists of dual (1x24) 2-wire multiplexer banks. Each bank can be interconnected within a module under program control (via bussing relays) to form
a 1 x 48 multiplexer. The EX1200 analog bus can be used to configure larger multiplexers which eliminates external wiring and helps reduce unterminated stub 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.
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Specifications
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Channel Count
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(1 x 48) 2-wire, Dual (1 x 24) 2-wire, or (1 x 24) 4-wire plus 2 Current @ 3 Amp
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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 Carry Current
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60 W dc |
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Maximum Switching Power
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125 V A |
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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)
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40 MHz typical
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Crosstalk (bank 1 to bank 2)
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1 MHz
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< -90 dB
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10 MHz
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< -60 dB
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Rated Switch Operations
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Mechanical
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1 x 107
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Electrical
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5 x 105 at full load
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Switching Time
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<3 ms
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Front Panel Connector
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104-pin HD D-sub
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Ordering Information
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EX1200-3048
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48 channel, 300 V/2A multiplexer
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| EX1200-TB104 |
Terminal block, 104-pin HD D-sub connector with internal CJC reference |
| 27-0389-104 |
104-pin HD D-sub mating connector with hood and pins, fixed contacts (no crimp tool required) |
| 27-0390-104 |
104-pin HD D-sub mating connector, backshell and pins, crimp style |
| 70-0297-001 |
Crimp tooling, includes handle and positioner, 22 AWG |
| 70-0363-501 |
104-pin HD D-sub mating connector and backshell, with 3 ft unterminated 22 AWG wire |
| 70-0367-001 |
EX1200-TB104, differential module |
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