Guildline Instruments is a leading Engineering Company renowned for designing, manufacturing, and marketing ultra-precise instruments for metrology and oceanography. Since 1957, our instruments have been instrumental in cutting-edge research and establishing traceability to fundamental electrical standards. Our clientele includes national research laboratories, metrology institutes, calibration facilities, militaries, nuclear power plants, aerospace entities, and electrical and power industry companies.


Electrical Metrology

DCC Resistance Bridges

  • Widest Available Range from 1 mΩ ~1 GΩ
  • Best Accuracy: ± 0.015 ppm of Reading
  • Modular Design, Expandable Capabilities, Complete Investment Protection
  • Wide Range of Ratios: 0.1:1 ~ 100:1

Digital Teraohmmeter/TeraohmBridge

  • Bridge and Direct Measurement Modes of Operation
  • Resistance Range 100 kΩ to 20 PΩ
  • “True Ratio” Provides Multi‐Ratios from 1:1 up to 100:1
  • Test Voltages 1 to 1000 V

Automated Resistance Measurement System

  • Complete Turn-Key System – Fully Integrated, Wired, Tested and Ready-to-Use
  • Widest Available Resistance Range from 1 μΩ ~1 GΩ with Internal Voltages to 1 kVdc
  • Precision Current Sources / Range Extension from 3 A to 10,000 A with Built-In Precision Current Source and Electronic Switching
  • Wide Range of Ratios: 0.1:1 ~ 100:1, and Up to 2,000,000:1 and More with Range Extension

High Current Range Extenders

  • Unique Guildline PATENTED Design
  • Dual Design – Extender and Precision DC Source
  • Includes Built-in Precision Current Source with Electronic Polarity Switching
  • Output Current Stability Typically < 10 ppm for 1000 A and Higher – Best in the World!
  • Advanced Modular Design, Over 64 Expandable Outputs in 150 A Increments to 10,000 A, Investment Protection
  • Measures Resistances Down to 0.1 μΩ
  • Automatic Control from 6622A Series Bridge

Thermal Quad Scanner

  • 8/16-channel input & 2-channel output
  • Gold flashed tellurium copper terminals
  • Thermoelectric Potentials: <20 nV
  • Up to 1000 volts

Temperature Air Bath

  • Excellent Temperature Stability, Better Than 0.015 ˚C over 24 Hours
  • Only Precision Air Bath that Includes a Separate PRT to Report the True Temperature from Anywhere Inside the Bath Chamber
  • Temperature Range 15 ˚C to 50 ˚C
  • Cooling Capacity up to 6 ˚C Below Ambient
  • Large Volume Enclosure – Over 82 Liters!
  • Perfect for Checking Temperature Coefficients of Precision Air Resistors
  • 5032 Fully Programmable Via the IEEE-488.2 or RS 232 Standard Interfaces

High Precision Temperature Fluid baths

  • Full Automation Via a Windows 10 Computer (USB, IEEE)
  • Excellent Temperature Stability Low As:
    ±0.0015 K with Oil!
    ±0.001 K with Water!
  • Fluid Temperature Range -5°C to 55°C
  • Designed for use with Oil, Salt Water, Water, and other Fluids
  • Customer Choice of 4 Tank Sizes: 50 L, 75 L, 100 L and 300 L Model
  • Fiberglass Tank with Proprietary EMI Shielding
  • Excellent Control via a PRT Sensor
  • 2nd Temperature Probe Included to Report Actual Temperature Anywhere in the Bath

Add Your Heading Text Here

  • High Current Values to 100 A
  • AC/DC Difference Essentially Zero at Power Frequencies, and < 10 ppm up to 10 kHz
  • Widest Available Bandwidth DC to100 kHz
  • Low Temperature Coefficients 2.5 ppm/°
  • 50 A and 100 A Models!
  • Calibrated Frequency Range (DC to 100 kHz)!
  • Uncalibrated 100 kHz to 2 MHz!
  • High 9 V Voltage Compliance!
  • Unique Touch Screen Interface and Embedded Windows Computer!
  • Series Ranges from 10 A to 10,000 A
  • 3 Point Current Calibration Provided
  • < 10 ppm Long Term Stability
  • Extremely Low Self-Heating Effects
  • Sub ppm ratio Uncertainties
  • Automated Self-Alignment (i.e. Self Calibration)
  • No External Standards required for Self-Alignment
  • Wider voltages range from 1:1 to 1000:1 & Reverse
  • Input voltage range from 1 to 1100 volts