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Agilent E1476A 64-Channel 3-Wire T/C Relay Multiplexer
Data Sheet
Features
* 1-Slot, C-size, register based * Low-thermal offset relay <2 V * 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 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
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. 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.
Product Specifications
Input
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): Maximum power per channel: 35 mA 4 VA
DC
Maximum thermal offset per channel, differential Hi-Lo: Closed channel resistance: <4 V, <2 V (10 samples averaged) 100 5
Insulation resistance (between any two points): 10E9 , 40C, 95% RH Insulation resistance (Hi to Lo, power off): n/a
AC
Maximum bandwidth (-3 dB, 50 source/load): Crosstalk (channel-to-channel): 100 kHz: 10 MHz: Both: Closed channel capacitance: -70 dB -45 dB n/a <175 pf H-L, <300 pf L-G, <1500 pf G-C 100 kHz
General Characteristics
Relays: Power down state: Power up state: Minimum relay life: No load: Rated load: Reference junction measurement accuracy (18 to 28 C operating): Strain gage excitation: Screw terminal wire size: Scanning rate: Reed relays Break-before-make Relays open on power down Relays open on power up 5 x 10E9 operations 10E7 operations 0.38 C n/a 22 to 26 AWG (0.5, 0.75, 0.9 mm) 333 channels/s typ.
2
General Specifications
VXI Characteristics
VXI device type: Size: Slots: Connectors: Shared memory: VXI busses: C-size capability: Register-based, A16, slave only C 1 P1/2 None None n/a
Ordering Information
Description
64-channel 3-wire T/C Relay Multiplexer Pre-QUIC-type terminal block Crimp-and-insert terminal block** Service Manual Extra pre-QUIC-type terminal block (if ordered seperately) Extra QUIC-type terminal block (if ordered seperately) Extra crimp-and-insert terminal block (if ordered seperately)**
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
Product No.
E1476A E1476A 106 E1476A A3E** E1476A OB3 E1476-80000 E1476-80010 E1476-80011**
Instrument Drivers
See the Agilent Technologies Website http://www.agilent.com/find/inst_drivers for availability and downloading. Command module firmware: Downloadable A.06 Yes Yes Yes Yes Yes Yes
Command module firmware rev.: I-SCPI Win 3.1: I-SCPI Series 700: C-SCPI LynxOS: C-SCPI Series 700: Panel Drivers: VXIplug&play Win Framework:
Agilent E1476A terminal block
VXIplug&play Win 95/NT Framework: Yes VXIplug&play HP-UX Framework: No
Module Current
IPM +5 V: +12 V: -12 V: +24 V: -24 V: -5.2 V: -2 V: 0.1 0 0 0 0 0 0 IDM 0.1 0 0 0 0 0 0
Cooling Slot
Watts/slot: P mm H2O: Air Flow liter/s: 4.00 0.10 0.30
3 Agilent E1476A Circuit Diagram
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Revised: October 24, 2007
Product specifications and descriptions in this document subject to change without notice. (c) Agilent Technologies, Inc. 2008 Printed in USA, January 11 2008 5965-5607E

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