309 Hypatia Milli Ohmmeter

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.