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Ammeter, Calibrated, DC Current, Bench, 2nA to 20mA, True RMS


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Manufacturer Part No:
6485 CAL
Newark Part No.:
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Technical Datasheet:
6485 CAL   Datasheet
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Product Information

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DC Current



2nA to 20mA

True RMS



Auto, Manual


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Technical Documents (1)

Product Overview

The 6485 CAL from Keithley is a high resolution bus programmable 5.5 digit picoammeter. It combines Keithley’s expertise in sensitive current measurement instrumentation with enhanced speed and a robust design. With eight current measurement ranges and high speed autoranging, this cost effective instrument can measure currents from 2nA to 20mA, taking measurements at speeds up to 1000 readings per second. The model 6485’s 10fA resolution and superior sensitivity make it well suited for characterizing low current phenomena while its 20mA range lets it measure currents high enough for applications such as measuring 4-20mA sensor loops. Although it employs the latest current measurement technology, it is significantly less expensive than other instruments that perform similar functions, such as optical power meters, competitive picoammeters, or user designed solutions. It conforms to European union directive 89/336/EEC, EN61326-1, European union directive 73/23/EEC, EN61010-1.
  • Calibrated picoammeter
  • Cost effective low current measurement solution
  • Low voltage burden and higher accuracy (<200µV burden voltage)
  • Built-in model 485 emulation mode
  • IEEE-488 and RS-232 interfaces analogue output
  • Scaled voltage analogue output and 220V overload protection
  • One-touch front panel design, built-in trigger link interface, 12 character vacuum fluorescent
  • Display on/off switch, REL and LOG functions, resistance calculations, rear panel BNC inputs
  • 100V to 120V or 220V to 240V, 50Hz to 60Hz, 30VA input
  • 90mm (H) × 214mm (W) × 369mm (D) case dimension, <2.8Kg net weight, 0° to 50°C operating temperature


Test & Measurement


6485 picoammeter with line cord, Low noise cable with male BNC on both ends (model 4801), Protective BNC shield/cap (CAP-18), Banana lead to screw terminal adapter (model CA-186-1B), Certificate of calibration, User manual, Manual Addenda, Product information CD-ROM that contains PDFs of the user’s and instruction manuals.


Before plugging in the power cord, make sure that the front panel power switch is in the off (O) position.


The maximum safe voltage between picoammeter LO and chassis ground (common mode voltage) is 42V. The 6485 does not internally limit the LO to chassis voltage. Exceeding 42V can create a shock hazard.

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