6485 - Multimeter Keithley - Free user manual and instructions
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| Product Type | Picoammeter / Electrometer |
| Model | 6485 |
| Brand | Keithley |
| Display | 5½-digit vacuum fluorescent |
| Current Measurement Range | 20 pA to 20 mA, 9 ranges |
| Basic Accuracy | ±0.1% for ranges ≥2 nA; ±0.2% for lower ranges |
| Input Impedance | < 1 mV voltage burden at full scale |
| Maximum Input | 250 V peak (DC + peak AC) |
| Resolution | 10 fA on the 20 pA range |
| Interfaces | IEEE-488 (GPIB), RS-232, digital I/O |
| Dimensions (W×H×D) | 216 mm × 88 mm × 320 mm |
| Weight | 3.2 kg (7 lb) |
| Power Supply | AC 100-240 V, 50/60 Hz, 60 VA max |
| Operating Temperature | 0°C to 50°C |
| Primary Functions | DC current measurement, autoranging, relative offset, data logging |
| Maintenance | Clean with damp cloth; periodic calibration recommended |
| Safety | EN 61010-1, CAT I 250 V |
| Spare Parts & Repairability | Fuses, input connectors; contact Keithley service for repairs |
| General Information | Low-noise picoammeter for sensitive current measurements |
Frequently Asked Questions - 6485 Keithley
What is the Keithley 6485 used for?
The Keithley 6485 is a picoammeter designed for measuring very low DC currents, from femtoamperes to milliamperes, commonly used in semiconductor testing, leakage current measurements, and photodiode characterization.
How do I connect the Keithley 6485 to my computer?
The 6485 is equipped with IEEE-488 (GPIB) and RS-232 interfaces. Use a suitable cable and install the appropriate drivers. Refer to the manual for SCPI commands for remote control.
What is the maximum input voltage?
The maximum input voltage is 250 V peak (DC + peak AC). Exceeding this may damage the instrument. Always use the guard terminal for high impedance measurements.
How often should I calibrate the 6485?
Keithley recommends annual calibration to maintain specified accuracy. Calibration can be performed by an accredited lab or returned to the factory.
Can the 6485 measure resistance?
No, the 6485 is a current-only meter. For resistance measurements, you would need a separate source and measure current, then calculate resistance using Ohm's law.
What is the zero check function?
The zero check function disconnects the input and connects a zero reference, allowing you to adjust the display to zero. It is used before making accurate measurements to eliminate offsets.
How do I clean the instrument?
Use a soft, damp cloth with mild detergent. Do not use abrasive cleaners or solvents. Avoid getting moisture inside the unit. Disconnect power before cleaning.
What is the warm-up time?
Allow a warm-up time of at least 30 minutes for the instrument to stabilize to its specified accuracy, especially after power-on or when operating in a new environment.
Are there any known issues with the 6485?
Some users report noise at the lowest ranges. Ensure proper shielding and use the guard terminal. For persistent issues, contact Keithley technical support.
Where can I find replacement fuses?
Replacement fuses are standard 250 mA, 250 V fast-blow (5×20 mm). They are available from electronics distributors. Always use the specified type to maintain safety.
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USER MANUAL 6485 Keithley
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Product information
Brand : Keithley
Model : 6485
Category : Multimeter