• 5 measurement functions
• Up to 90 readings/s
• Electronic calibration
• 100 nanovolt resolution
• Options:
  315 - 100V, 50Hz
  335 - 220V, 50Hz
  316 - 100V, 60Hz
  336 - 220V, 60Hz
  325 - 120V, 50Hz
  345 - 240V, 50Hz
  326 - 120V, 60Hz
  346 - 240V, 60Hz
  901 - Front Handle Kit
  908 - Rack Mount Kit

The 3478A provides a low cost, full function, reliable DMM for system measurements. Selectable 3 1/2 to 5 1/2 digit resolution and 5 autoranging functions offer flexibility in automated testing. The 3478A can measure DCV, true RMS ACV, 2- and 4-wire ohms, and dc and ac current. Simple, fast electronic calibration eliminates all adjustments to provide a lower cost of ownership.

Low Cost of Ownership

The combination of an extremely reliable DMM with features like complete electronic calibration and self-test gives you the lowest cost of ownership. We're so sure of the 3478A's reliability that you can get additional hardware service for less than 2% of the DMMs price per year.

Performance

Selectable speed and resolution provide the right capability for your measurement. The 3478A can perform production tests or acquire experimental data at 90 readings/s with 3 1/2 digit resolution, or take 35 readings/s with 130 dB of noise rejection using 4 1/2 digits. The 5 1/2 digit mode offers 100 nVdc and 100 μW resolution for precise measurements. True RMS with 300 kHz bandwidth and 4:1 crest factor provides reliable measurements of ac signals. Fast autoranging makes the first reading useful and accurate.

Designed for Systems

Switchable front/rear inputs permit flexible system connections. The Voltmeter Complete output and External Trigger input allow synchronization of the 3478A with a scanner for fast multiplexed measurements without the delay of software commands. The test program can write prompt messages or results on the alphanumeric display. The operator can respond by pressing the 3478A's SRQ key to interrupt the controller and start the next test. Built-in self-test capability assures proper operation.

Electronic Calibration

Complete calibration of the 3478A is accomplished without any internal adjustment or removing the instrument's covers. The simple and fast electronic calibration procedure lowers the cost of ownership. You only need to connect standards to the 3478A and store calibration constants in the 3478A's non-volatile memory. Calibration can be done manually from the front panel or automatically using HP-IB.