The Keithley 6485 is a 5½-digit picoammeter designed to measure low currents with high sensitivity and speed. It offers eight current measurement ranges from 2 nA to 20 mA, making it ideal for characterizing optoelectronic components, testing sensors, and performing basic low-current measurements.
Specifications
General
| Parameter | Value |
|---|---|
| Display | 5½-digit vacuum fluorescent display (VFD) |
Physical
| Parameter | Value |
|---|---|
| Operating Temperature | 0 °C to 50 °C |
| Weight | 2.8 kg |
Measurement Specifications
| Parameter | Value |
|---|---|
| Measurement Ranges | 2 nA, 20 nA, 200 nA, 2 µA, 20 µA, 200 µA, 2 mA, 20 mA |
| Display Resolution | 5½ digits |
| Maximum Resolution | 10 fA |
| DC Current Accuracy (2 nA Range) | ±(0.4% + 400 fA) |
| DC Current Accuracy (20 nA Range) | ±(0.4% + 1 pA) |
| DC Current Accuracy (200 nA Range) | ±(0.2% + 10 pA) |
| DC Current Accuracy (2 µA Range) | ±(0.15% + 100 pA) |
| DC Current Accuracy (20 µA Range) | ±(0.1% + 1 nA) |
| DC Current Accuracy (200 µA Range) | ±(0.1% + 10 nA) |
| DC Current Accuracy (2 mA Range) | ±(0.1% + 100 nA) |
| DC Current Accuracy (20 mA Range) | ±(0.1% + 1 µA) |
| Temperature Coefficient | 0.1 × (specified accuracy) per °C (for 0 °C to 18 °C and 28 °C to 50 °C) |
Input Characteristics
| Parameter | Value |
|---|---|
| Maximum Overload Input Voltage (Continuous) | 220 V peak |
| Isolation (Input Common to Chassis) | 500 V peak |
System Performance and Triggering
| Parameter | Value |
|---|---|
| Maximum Reading Rate (Internal Buffer) | 1000 readings/s |
| Maximum Reading Rate (over GPIB) | 900 readings/s |
| Internal Buffer Size | 2500 readings |
| Digital Filter Configurations | Median (1 to 10 readings), Average (1 to 100 readings, repeat or moving) |
Connectivity and Control
| Parameter | Value |
|---|---|
| GPIB Interface | IEEE-488.2 |
| Trigger Link Connector Type | 8-pin micro-DIN |
| Command Set Compatibility | SCPI-1996 |
| Emulation Modes | Keithley 485 |
Power and Electrical
| Parameter | Value |
|---|---|
| AC Line Voltage Input Range | 100 V to 240 V AC |
| AC Line Frequency Range | 50 Hz to 60 Hz |
| Power Consumption | 30 VA maximum |
Physical Characteristics
| Parameter | Value |
|---|---|
| Rack Unit Size | 2U half-rack |
| Dimensions with Bumpers (W x H x D) | 238 mm × 104 mm × 370 mm |
Environmental and Safety
| Parameter | Value |
|---|---|
| Storage Temperature Range | -25 °C to 65 °C |
| Operating Altitude Limit | 2000 m |
| Warm-up Time | 1 hour |
| EMC/RFI Standards | EN 61326-1 |
| CE Mark Status | Yes |
Accessories and Calibration
| Parameter | Value |
|---|---|
| Optional Shielded Cables | 4801 Low-Noise BNC Input Cable |
| Optional Rack Mount Kits | 4288-1 (single), 4288-2 (dual) |
| Calibration Interval | 1 year |
Instrument Features
| Parameter | Value |
|---|---|
| Zero Check Function | Selectable on/off, redirects input current to ground for safe connection and zeroing |
Interfaces
| Parameter | Value |
|---|---|
| Trigger Link Channels | 6 independent channels |
Control & Software
| Parameter | Value |
|---|---|
| Programming Language | SCPI (Standard Commands for Programmable Instruments) |
Measurement Control
| Parameter | Value |
|---|---|
| Measurement Ranging | Automatic or manual |
Technology
Analog-to-digital measurement
Applications
Low current measurement, photodiode characterization, fiber optic testing, component testing