Agilent E1476A 64-Channel 3-Wire T/C Relay Multiplexer Data Sheet Features • 1-Slot, C-size, register based • Low-thermal offset relay <2 µV • 64 channels of temperature with compensation • 64 channels of voltage - 3-wire high, low, and guard • 64 channels 2-wire and 32 channels 4-wire resistances • Includes QUIC easy-to-use terminal block Description The Agilent E1476A High-Density Reed Relay Multiplexer is a C-size, 1-slot, register-based VXI module. This low-offset, thermocouple compensated multiplexer is dynamically configurable providing 64 channels of two-, three- or four-wire (32 channels) of switching. This multiplexer module consists of a component card with switches and a QUIC spring clamp terminal block that plugs onto the component card. The E1476A is ideal for applications needing a relay multiplexer that is dynamically configurable, and makes maximum high-quality, high-point count measurements. High-integrity voltage measurements are possible with three-wire high, low, and guard switching. In addition to making two-wire resistance and precision four-wire resistance measurements, you can make up to 64 channels of thermocouple temperature measurements with automatic cold junction compensation. Refer to the Agilent Technologies Website for instrument driver availability and downloading instructions, as well as for recent product updates, if applicable. Temperature Measurements The reference thermistor is also accessible by both banks, each bank having a control switch allowing for either a two-wire or four-wire resistance measurement of the 5000 Ω reference thermistor mounted on the isothermal plane located in the terminal block. Using a scanning multimeter configuration, the channel relays and five control relays are programmed by SCPI commands or by register read/ writes. SCPI command syntax to make a temperature scan of K type thermocouples is: MEAS:TEMP? TC, K, (@100:163) Configuration Product Specifications Each of the 64 channels provides separate high, low, and guard connections, all easily accessible via the quick connect screwless terminals on the companion terminal block. The multiplexer is organized in two banks of 32 with each bank having its own voltage sense control switch and one bank having a current source control switch. This dual bank configuration makes it possible to use half the channels as sense channels, while the other half are used as current source channels, thus obtaining 32 four-wire measurement channels, each with high, low, and guard connections. Input One 6 cm (2.5-in) analog bus cable (E1400-61605) is shipped with each module to allow you to interconnect the E1411B 5.5-digit multimeter to one or more E1476A multiplexers via its front panel analog bus connector. For connection to an external voltmeter or other VXI multimeter with conventional front panel connectors, access to the analog bus lines is available in the terminal block. This allows you to connect the analog bus signal lines to the multimeter inputs using ordinary hookup wire. AC DC: Maximum voltage 120 Vdc (any terminal to any other terminal or chassis): AC rms: Maximum voltage 120 V rms (any terminal to any other terminal or chassis): Maximum current (per channel common, non-inductive): 35 mA Maximum power per channel: 4 VA Maximum thermal offset per channel, differential Hi-Lo: <4 µV, <2 µV (10 samples averaged) Closed channel resistance: 100 Ω ±5 Ω DC Insulation resistance (between any two points): 10E9 Ω, 40ºC, 95% RH Insulation resistance (Hi to Lo, power off): n/a Maximum bandwidth (-3 dB, 50 Ω source/load): 100 kHz Crosstalk (channel-to-channel): 100 kHz: -70 dB 10 MHz: -45 dB Both: n/a Closed channel capacitance: <175 pf H-L, <300 pf L-G, <1500 pf G-C General Characteristics Relays: Power down state: Power up state: Minimum relay life: No load: Rated load: Reed relays Break-before-make Relays open on power down Relays open on power up 5 x 10E9 operations 10E7 operations Reference junction measurement accuracy (18 to 28 ºC operating): 0.38 °C Strain gage excitation: n/a Screw terminal wire size: 22 to 26 AWG (0.5, 0.75, 0.9 mm) Scanning rate: 333 channels/s typ. 2 General Specifications Ordering Information VXI Characteristics Description Product No. 64-channel 3-wire T/C Relay Multiplexer E1476A Pre-QUIC-type terminal block E1476A 106 Crimp-and-insert terminal block** E1476A A3E** Service Manual E1476A OB3 Extra pre-QUIC-type terminal block (if ordered seperately) E1476-80000 Extra QUIC-type terminal block (if ordered seperately) E1476-80010 Extra crimp-and-insert terminal block (if ordered seperately)** E1476-80011** VXI device type: Register-based, A16, slave only Size: C Slots: 1 Connectors: P1/2 Shared memory: None VXI busses: None C-size capability: n/a Instrument Drivers See the Agilent Technologies Website http://www.agilent.com/find/inst_drivers for availability and downloading. Command module firmware: Downloadable Command module firmware rev.: Notes: ** Crimp-and-insert contacts are not included. Crimp-and-insert contacts order 1252-6533 or ERNI 014728 Crimp-and-insert tools Hand crimp tool 8710-2306 or ERNI 014374 Pin extractor tool 8710-2307 or ERNI 471555 Extra crimp and insert connectors 96 pin connector body 1252-6532 or ERNI 024069 160 pin connector body 1252-6531 or ERNI 024070 A.06 I-SCPI Win 3.1: Yes I-SCPI Series 700: Yes C-SCPI LynxOS: Yes C-SCPI Series 700: Yes Panel Drivers: Yes VXIplug&play Win Framework: Yes Agilent E1476A terminal block VXIplug&play Win 95/NT Framework: Yes VXIplug&play HP-UX Framework: No Module Current +5 V: +12 V: -12 V: +24 V: -24 V: -5.2 V: -2 V: IPM IDM 0.1 0 0 0 0 0 0 0.1 0 0 0 0 0 0 Cooling Slot Watts/slot: 4.00 ∆P mm H2O: 0.10 Air Flow liter/s: 0.30 3 Agilent E1476A Circuit Diagram Remove all doubt www.agilent.com/find/emailupdates Get the latest information on the products and applications you select. www.agilent.com/find/agilentdirect Quickly choose and use your test equipment solutions with confidence. www.agilent.com/find/open Agilent Open simplifies the process of connecting and programming test systems to help engineers design, validate and manufacture electronic products. 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