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YOKOGAWA 2558

The Yokogawa 2558 Digital Electrometer is a high-precision, multi-function bench-top instrument designed for measuring extremely low-level electrical signals with exceptional accuracy and minimal loading effect. It is engineered for advanced research and development, quality assurance, and production testing applications where measuring low currents, high resistances, low voltages, and small charges is critical.

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(Key Parameters)
Parameter Category Specification
Model 2558 Digital Electrometer
Measurement Functions DC Voltage (V), DC Current (A), Resistance (Ω), Charge (C)
DC Voltage Range 10 ranges: ±1.000000 mV to ±1000.00 V
DC Voltage Accuracy ±(0.05% of reading + 0.005% of f.s.) (on 1000 V range)
Input Impedance > 10^18 Ω (Voltage mode), 10^18 Ω (Charge mode)
DC Current Range 17 ranges: ±1.000000 fA to ±20.00000 mA (femptoamperes to milliamperes)
DC Current Accuracy ±(0.3% of reading + 0.05% of f.s.) (on 20 mA range)
Minimum Current 1 fA (femptoampere, 10^-15 A)
Resistance Range 16 ranges: 10.0000 Ω to 1.000000 PΩ (Petaohm, 10^15 Ω)
Resistance Accuracy ±(0.5% of reading + 0.05% of f.s.) (applies to constant voltage method)
Charge Range 8 ranges: ±1.000000 pC to ±20.00000 μC (picocoulombs to microcoulombs)
Charge Accuracy ±(0.5% of reading + 0.05% of f.s.) (on 20 μC range)
Built-in Voltage Source Output Ranges: ±1.00000 V to ±1000.0 V (for resistance measurements)
Display Dual display: 7-digit LCD for primary reading, 5-digit for secondary, analog bar graph
Interface (Optional) GP-IB (IEEE-488.2), RS-232
Applications • Semiconductor device leakage current testing
• Insulation resistance of materials
• Photocurrent measurement
• Charge decay measurement (static electricity)
• Sensor evaluation
• Capacitor leakage testing