HP E1476A 64-Channel 3-wire T/C Relay Multiplexer

The HP 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 an HP QUIC spring clamp terminal block that plugs onto the component card. The HP 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 Related Links Section below 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 Omega 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 provide 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 HP E1411B 5.5-digit multimeter to one or more HP 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.

For thermocouple measurements, HP E1476A Opt A3E terminal block, HP E1586A panel, and HP E1588A cables are recommended.

[ 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 HP QUIC easy-to-use terminal block

[ Specifications ]

VXI Characteristics
VXI device type:      Register based, A16, slave only
Size:                 C
Slots:                1
Connectors:           P1/2
Shared memory:        None
VXI busses:           None
C-size compatibility: n/a



Instrument Drivers

See the HP Website (http://www.hp.com/go/inst_drivers) for driver 
availability and downloading.

Command module firmware:      Downloadable
Command module firmware rev:  A.06
I-SCPI Windows™ 3.1:          Yes
I-SCPI Series 700:            Yes
C-SCPI LynxOS:                Yes
C-SCPI Series 700:            Yes
HP Panel Drivers:             Yes
VXIplug&play Windows
Framework:                    Yes
VXIplug&play Windows 95/NT
Framework:                    Yes
VXIplug&play HP-UX Framework: No



Module Current

       I_PM   I_DM
+5 V:  0.1   0.1
+12 V: 0     0
–12 V: 0     0
+24 V: 0     0
–24 V: 0     0
–5.2 V:0     0
–2 V:  0     0



Cooling/Slot

Watts/slot:       4.00
DeltaP mm H2O:    0.10
Air Flow liter/s: 0.30

[ Ordering ]

HP E1476A 64-Channel 3-Wire T/C Relay Multiplexer Opt 106 Pre-HP QUIC-type Terminal Block Opt A3E Crimp-and-Insert Terminal Block ** Opt A3F Interface to Rack-Mount Terminal Panel * Opt 0B3 Service Manual Opt W013 Year Return to HP to 1 Year OnSite Warranty HP E1476-80000 Extra Pre-QUIC-type Terminal Block (if ordered separately) HP E1476-80010 Extra HP QUIC-type Terminal Block (if ordered separately) HP E1476-80011 Extra Crimp-and-Insert Terminal Block (if ordered separately)** HP E1476-80012 Extra Interface to Rack-Mount Terminal Panel (if ordered separately)* * For use with the HP E1586A Panel and HP E1588 Cable Set. ** Crimp-and-Insert Contacts are not included. See the Interconnect and Wiring section for information on ordering Crimp-and-Insert Contacts.

[ Key Literature ]