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309 Hypatia Milli Ohmmeter

Used

The 309 is a Milliohm Meter from Hypatia. When engineers need to collect information regarding electrical connections such as wires, conduits, or cables, they use a milliohm meter. This piece of electronic testing equipment measures the smallest resistance values. An engineer would use a milliohm meter instead of a traditional ohmmeter to document and log resistance amounts at the lower end of the scale (small values of ohms).

Additional Features:

Electrical

Impedance Measurement

  • Accuracy: ± 1% of reading (when the test current is > 500μ / impedance in Ohms and > 30 mA)
  • Range: 0 to 100 Ohms
  • Measurement Technique: Successive approximation analog to digital conversion of sensed voltage and current
  • Measurement window: Either 2 or 3 full sine waves depending upon line frequency (e.g. 3 at 60 Hz, 2 at 50 Hz)
  • Sample rate: ~ 53 KHz, yielding ~ 2.6K voltage and 2.6K current samples per measurement window at 60 Hz, and ~ 2.1K voltage and 2.1K current samples/window at 50 Hz
  • Mathematical conversion to true rms voltage and current values, division independent of phase to yield impedance
  • Display derived from four layer stack averaging
  • Voltage is sensed at the probe heads by internal probe sense lines or, for Model 109 probes, by precision Kelvin sensing

Digital Current Measurement

  • Accuracy: ± 1% of reading ± 4 mA
  • Range: 0 to 144 Amps rms

Bar Graph Current Measurement

  • Accuracy: ± 1% of reading ± 4 mA at transition points (every 2.5 Arms)
  • Range: 2.5 to 77.5 Amps rms (0 to 2.5 Arms implied) (Note 3, Graph 2)
  • Measurement Technique: Logical translation of digital current measurement

Digital Timer

  • Accuracy: ± .1% (Digital Timer and Audio / Visual Alerts applicable to Model 309 or, if server driven, Model 308)
  • Range: 1 second to 59 minutes, 59 seconds (extended times possible under server software)
  • Internal Reference: 16.777 MHz (2e24) crystal controlled system clock

Audio/Visual Alerts

  • When enabled, sounds and flashes when any user specified test current or impedance limit is violated
  • Accuracy: Logically detected. The accuracy therefore exactly matches the accuracy of associated measurements

Operating Duty Cycle

  • Continuous to test currents of 35 Amps
  • Derate linearly to 50% duty cycle at 60 Amps
  • Maximum Cycle Period: 35 to 60 Amps: 4 Minutes
  • Maximum allowed common mode voltage to ground: 50 Vrms, 71 Vpeak or dc
  • Maximum normal mode open circuit probe source voltage (at 132 Vrms line voltage): 8.6 Vrms, 12.1 Vpeak

Input Power Requirements

  • 90 to 132 Volts rms
  • 48 to 66 Hertz sine wave
  • Maximum Power: 396 Watts (3.0 Arms at 132 Vrms)

Check Resistor

  • Resistance: 100 milliohms ± 1%
  • Maximum continuous current: 17.5 Amps

Verification Schedule

  • There are no hardware calibration adjustments, and thus no hardware calibration is required or possible
  • Software calibration data is available, but it's normally unnecessary to modify this data 
  • Complete the formal performance verification procedure annually or following any repair service

Safety Certification 

  • Designed and manufactured to meet or exceed UL 3111 
  • Instruments manufactured before January 2008 were so listed by ETL

Environmental\

  • Operating Temperature Range: 5 to 40°C
  • Relative Humidity Range: 0 to 90% non-condensing

Physical

Overall Dimensions

  • Height: 10.92 centimeters (4.30 inches)
  • Width: 21.15 centimeters (8.33 inches)
  • Depth: 26.0centimeters (10.24 inches)

The Hypatia 309 is a High Current Sourcing Milliohm Meter.

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