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Model 6664B
Low Thermal Quad Scanner
Complements And Extends Guildline Bridges For Increased Flexibility
G uildline 6664B Low Thermal Quad Scanner allows for the
direct comparison of four terminal resistance standards,
such as the Guildline 9330 and 9334A standard resistors. The
scanner is designed to work with the Guildline Automatic
Direct Current Comparator (DCC) Resistance / Temperature
Bridges.
Four terminal resistance comparisons can be made simply by
selecting one device on the A-output lines and another on the
B-output lines. All four connections for both resistors on the
matrix are switched. All other connections remain floating.
The 6664B performs switching for precision resistance
measurements with less than 20 nanovolts of thermal offsets.
Careful design in the use of latching relays requiring only a
short pulse to actuate, eliminates self heating errors.
The 6664B Low Thermal Quad Scanner allows for
the direct comparison of four terminal resistance
standards, such as the Guildline 9330 and 9334A
standard resistors.
6664B Features
Gold fingers on the relay armature make direct contact to hard
gold pads on special circuit boards, and inputs are attached
directly to the relay boards thereby reducing the number of
> Thermoelectric Potentials: <20 nV connections. All relays are mounted in a heavy gauge
> Contact Life: >10,000,000 cycles machined aluminum enclosure to maintain thermal
equilibrium.
> Front Panel or Remote GPIB Control
Leakages between the high and low circuits are reduced by
> 4 Terminal Switching Matrix, 16 Channel switching them on different printed circuit boards. The 6664B
inputs, 2 Channel outputs offers convenient operation from either the front panel or from
the built in IEEE-488 bus.
> Gold flashed Tellurium Copper Terminals
The logical input and output arrangement makes for easy
> Front panel indication of channels selected connections to automate the Guildline Resistance /
Temperature Bridges. With the extremely low thermal offsets,
this scanner simplifies the measurement process.
Protection circuits prevent selection of more than one 4
terminal connection on a channel output at the same time.
Front panel indicators show which channel is selected on each
output.
6664B Low Thermal Quad Scanner
Electrical Specifications
Thermoelectric Potentials: <20 nV typical and <50nV max.
Relay Contact Ratings: Life: >10,000,000 cycles at low levels
Initial Contact Resistance: 0.05 max.
Current: 2A max at 10 V
Voltage Switched: 100 V max. at 1 mA
Voltage Non-Switched: 600 V max.
Leakage Resistance: >1012
Rear Panel Inputs: 16 by four