6487/E

The 5½-digit Model 6487 Picoammeter/Voltage Source improves on the measurement capability of the award-winning Model 6485, and adds a high resolution 500V source. It provides higher accuracy and faster rise times than the 6485, as well as a damping function for use with capacitive devices. With eight current measurement ranges and high speed autoranging, this costeffective instrument can measure currents from 20fA to 20mA, take measure­ments at speeds up to 1000 readings per s­ econd, and source voltage from 200µV to 505V. • 10fA resolution • 5½-digit resolution • 1GW) in applications such as insulation resistance testing. A c­ onstant voltage is placed in series with the unknown resistance and the picoammeter. The voltage drop across the picoammeter is negligible, so all the voltage appears across the unknown resistance. The resulting current is measured by the picoammeter and the resistance is calculated using Ohm’s Law (R = V/I). To prevent generated current due to electrostatic interference, the unknown resistance is housed in a shielded test fixture. A small series resistor may be added to reduce noise if the un­known resistor has high stray capacitance across it. Metal Shield R 6487 Picoammeter/ Voltage Source HI Ammeter When do you need a picoammeter? Measuring low DC currents often demands a lot more than a digital multimeter can deliver. Generally, DMMs lack the sensitivity required to measure currents less than 100nA. Even at higher currents, a DMM’s input voltage drop (voltage burden) of hun­dreds of millivolts can make accurate current measurements impossible. Electrometers can measure low currents very accu­rately, but the circuitry needed to measure extremely low currents, combined with functions like voltage, resistance, and charge measure­ ment, can increase an electrom­ eter’s cost significantly. The Model 6487 Picoammeter/Voltage Source combines the economy and ease of use of a DMM with low current sensitivity near that of an electrometer. LO HI Vsource LO Accessories Available CABLES 6517-ILC-3 Interlock Cable for 8009 Resistivity Test Fixture 7007-1 Shielded IEEE-488 Cable, 1m (3.3 ft) 7007-2 Shielded IEEE-488 Cable, 2m (6.6 ft) 7007-4 Shielded IEEE-488 Cable, 4m (13.1 ft) 7078-TRX-10 Low Noise Triax Cable, 3.0m (10 ft) 7078-TRX-20 Low Noise Triax Cable, 6.0m (20 ft) 8501-* Trigger Link Cable with male Micro-DIN connectors at each end, 1m or 2m (3.3 ft or 6.6 ft) Measures low currents and high resistances quickly, accurately, and economically Picoammeter/ Voltage Source Services Available 6487-3Y-EW TEST FIXTURES 8009 Resistivity Test Fixture RACK MOUNT KITS 4288-* Single or Dual Fixed Rack Mounting Kit 1-year factory warranty extended to 3 years from date of shipment C/6487-3Y-ISO 3 (ISO-17025 accredited) calibrations within 3 years of purchase* *Not available in all countries GPIB Interfaces KPCI-488LPA IEEE-488 Interface/Controller for the PCI Bus KUSB-488B IEEE-488 USB-to-GPIB Interface Adapter ADAPTERS 237-TRX-BAR Triax Barrel 7078-TRX-BNC Triax-to-BNC Adapter 1.888.KEITHLEY (U.S. only) www.keithley.com A Greater Measure of Confidence LOW LEVEL MEASURE & SOURCE Measures low currents and high resistances quickly, accurately, and economically 6487 Picoammeter/ Voltage Source Model 6487 specifications Typical Analog 5½ Digit Accuracy (1 Year) 1 Rise Time (10% to 90%) 3 Default ±(% rdg. + offset) Typical Damping4 Range Resolution 18°–28°C, 0–70% RH RMS Noise 2 Off On 2 nA 10 fA 0.3  % + 400 fA 20 fA 4 ms 80 ms 20 nA 100 fA 0.2  % + 1 pA 20 fA 4 ms 80 ms 200 nA 1 pA 0.15% + 10 pA 1 pA 300 µs 1 ms 2 µA 10 pA 0.15% + 100 pA 1 pA 300 µs 1 ms 20 µA 100 pA 0.1  % + 1 nA 100 pA 110 µs 110 µs 200 µA 1 nA 0.1  % + 10 nA 100 pA 110 µs 110 µs 2 mA 10 nA 0.1  % + 100 nA 10 nA 110 µs 110 µs 20 mA 100 n A 0.1  % + 1 µA 10 nA 110 µs 110 µs TEMPERATURE COEFFICIENT: 0°–18°C & 28°–50°C. For each °C, add 0.1 × (% rdg + o­ ffset) to accuracy spec. Input Voltage Burden: