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Cầu đo điện trở Lake Shore Model 372 AC Resistance Bridge

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Cầu đo điện trở Lake Shore Model 372 AC Resistance Bridge

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Cầu đo điện trở Lake Shore Model 372 AC Resistance Bridge


Measurement input

Input type AC, 4-lead differential, resistance
Number of inputs 1
Maximum channels 16 (with optional scanner)
Resistance ranges 22 ranges from 2 mΩ to 63.2 MΩ (excitation dependent)
Maximum update rate 10 rdg/s (single range and input)
Range change settling 3 s + filter settling
Channel change (scan) settling 3 s + filter settling
Resolution Sensor and range dependent, refer to Measurement Input Specifications table
Accuracy Sensor and range dependent, refer to Measurement Input Specifications table
Temperature coefficient ±0.0015%/°C of rdg
Maximum lead resistance 100 Ω + 10% of resistance range per lead for current ≤3.16 mA; 10 Ω + 10% of resistance range per lead for current ≥10 mA
Isolation Isolated from chassis and heater grounds
Lead connections V+, V-, I+, I-, V shield, I shield, individual guards
Scanner lead connections V+, V-, I+, I-, for each sensor, shield common to all
Common mode rejection Matched impedance voltage input and current output, active CMR
Excitation Sinusoidal AC current source
Excitation frequency 9.8 Hz, 11.6 Hz, 13.7 Hz (default), 16.2 Hz, or 18.2 Hz
Excitation currents 22 ranges from 1 pA to 31.6 mA RMS
Excitation accuracy ±2% of nominal
Minimum excitation power 10-18 W into 100 kΩ (see Measurement Input Specifications table for other ranges)
Typical DC bias current 2 pA +1% of excitation current (4.0 × 10-19 W into 100 kΩ)
Maximum DC bias current 4 pA +1% of excitation current (1.6 × 10-18 W into 100 kΩ)
Power up current protection Current output shunted on power up
Voltage input ranges 12 ranges from 2 µV to 632 mV RMS
Voltage input over-range 20%
Voltage input impedance >5 × 1013 Ω
Maximum input voltage noise 10 nV/√Hz at 10 Hz
Range selection modes Manual, voltage excitation, current excitation, autorange
Scanner modes Manual or autoscan
Filter 1 s to 200 s settling time, 1% to 80% filter window
Additional software features Min/Max reading capture, pause (3 s to 60 s) on range and/or channel change, scanner dwell time (1 s to 200 s)
Supported sensors NTC resistive sensors including germanium, Cernox®, Rox™, PTC resistive sensors including rhodium-iron
Quadrature display Real and imaginary
Connectors 6-pin DIN (current out), 6-pin DIN (voltage in), and D6-pin DIN (current out), 6-pin DIN (voltage in), and DA-15 (scanner control)
Supported scanners Lake Shore 3726 and 3708

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