(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