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Cropico DO6

The Cropico DO6 is a comprehensive ohmmeter covering a wide measurement range from 1 μΩ to 200 kΩ. It incorporates many advanced features as standard, including manual and automatic range selection, temperature compensation for copper and brass, and a voltage limiting facility for switch contact resistance measurements in accordance with international standards.

Designed for precision and versatility, the DO6 is equipped with user-friendly controls, advanced compensation functions, and reliable output and interface options, making it suitable for laboratory, production, and field applications.

Function

• Measurement range from 1 μΩ to 200 kΩ
• 4-terminal Kelvin/Thomson principle eliminates errors due to lead resistance
• Manual or automatic range selection with auto-zero
• Temperature compensation for copper and brass alloys (referenced to 20 °C)
• Voltage limiting facility for dry circuit contact resistance testing
• Relay output for pre-set tolerance checking (“Too Small”, “Correct”, “Too Large”)
• RS232 interface for remote communication
• Rugged design for laboratory and industrial applications

Technical Specifications

measurement principle

  • 4-terminal Kelvin/Thomson method (eliminates lead resistance errors)

display

  • 4.5-digit, 15 mm 7-segment LED with polarity and overload indication

  • 2-digit, 16-segment LED for unit display

ranges

  • 9 ranges with manual selection via up/down keys

  • Automatic range selection with autorange function

auto zero

  • Automatic zeroing of amplifiers and external circuits

temperature compensation

  • Copper (Cu): 3.93 %/K

  • Brass Ms63: 1.50 %/K

  • Brass Ms80: 1.60 %/K

  • Reference: 20 °C

  • Ambient temperature measured with Pt100 sensor

relay output

  • Pre-selected upper and lower limit values

  • Indicators: “Too Small”, “Correct”, “Too Large”

  • Contact load: 30 W max, 48 V, 1 A

dry circuit measurement

  • In accordance with DIN 41640 part 4 and IEC 132-1

  • Open circuit voltage limited to 18 mV

interface

  • RS232, 25-pin D-Sub, talk/listen function

terminals

  • 4 mm safety sockets

operating conditions

  • Temperature: 0 °C to 50 °C

  • Relative humidity: 90 % max, non-condensing

storage conditions

  • Temperature: -20 °C to +60 °C

power supply

  • 230 V ±6 % / -10 %

  • Frequency: 45–65 Hz

  • Power consumption: ~30 VA

safety compliance

  • IEC 1010, Protective Class 1

dimensions

  • 255 × 90 × 263 mm (W × D × H, approx.)

weight

  • ~5 kg

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