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simpson 444 Micro-Ohmmeter

simpson 444 Micro-Ohmmeter,AC pulse or DC polarity switching measurement methods ,Measures from 1 micro-ohm to 20 ohms ,AC lined-powered or battery-powered for lab or field use ,User-adjustable, low-r

simpson 444 Micro-Ohmmeter

High accuracy and a high resolution 4-1/2 digitLCD display make the 444 perfect for testing conductive coatings,high power fuses, and antenna grounding systems. With a testvoltage of only 100uV, the 444 will not "punch through"contamination or corrosion. The 444 comes with a test lead with aBNC connector on one end and a Kelvin clip on the other, manual,line cord and Ni-Cad battery for field use.

  • AC pulse or DC polarity switching measurementmethods
  • Measures from 1 micro-ohm to 20 ohms
  • AC lined-powered or battery-powered for lab orfield use
  • User-adjustable, low-resistance alarm
  • Measures from 1 Micro-Ohm to 20 Ohms

     

    Simpson’s high precision Model 444 Micro-Ohmmeter measures resistance from 1

    micro-ohm to 20 ohms. It measures using an extremely small test voltage (100 microvolt maximum) and a four wire measurement technique. The resistance reading is indicated on a 4- 1/2 digit LCD display using one of two measuring

    modes: An automatic AC measurement mode or a manual DC measurement mode.By limiting the test voltage of the Model 444 to only 100 micro volts the

    instrument will not "punch through" contamination or corrosion. An audible tone can be used to indicate resistance values below any selected reading. The Model 444 is powered by either a 120 or 240 AC source or, from self-contained

    rechargeable Ni-Cad batteries for field use.

     

    20,000 Count 4 1/2-Digit LCD

    Specifications (Continued)

    2 Measurement Methods: AC Pulse and DC Polarity Switching

    Relative Humidity: 90% maximum up to 35°C,

    70% maximum up to +50°C (non-condensing)

    8"Punch-Through" Prevention by 100 _V Max.Test Voltage

    Temperature Coefficient: 0.1 times the applicable accuracy specification per

    °C (0° to 18°C and 28° to 50°C)

    User-Adjustable, Low-Resistance Alarm

    BatteryVoltageEffect: Plus orMinus (0.15% of input); Fully charged to "B"

    AC Test Mode Cancels Offset Voltages and Thermocouple Effects

    annunciator displayed

    Includes Ni-Cad Battery for Field Use and Test Leads

    BatteryLife:8 hourstypical

    Specifications

    Rated Circuit-To-Ground Voltage: 30V (RMS)

    Range

    Resolution

    Maximum Test Current

    Dimensions: 2.7" x 8.4" x 9.0" (68 x 213 x 228 mm) nominal

    20mΩ

    Ω

    5mA

    200mΩ

    10μΩ

    500μA

    2Ω

    100μΩ

    50μA

    20Ω

    1mΩ

    5μA

    Weight: Approximately 3 Ibs.

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