AEMC L481 DC High Voltage Data Logger


  • Measures up to ±850 VDC
  • Storage rate of 8x per second to once/day
  • Store up to 240,000 measurements
  • USB 2.0 communication interface
  • Simple LED status display
  • Battery powered
SKU: L481 Categories: ,


The AEMC Simple Logger® II model L481 DC Voltage Data Logger provides an extended voltage measurement range of ±850 VDC with a resolution of 0.1V making is suitable for applications such as monitoring rail voltages, machines, windmills, power supplies and battery packs and for finding intermittent voltage problems.

The L481 can be programmed to sample from 8 times per second to once a day. It can store up to 240,000 measurements in internal non-volatile memory and offers 3 recording modes including Extended Recording Mode (XRM®) for long term data collection. The L481 is battery powered and can operate up to 45 days on 2x AA cells. A simple LED display on the front of the logger provides an immediate indication of logging status and memory usage. Voltage inputs are via standard recessed banana jacks and a set of 5 foot cables with alligator clips are included with the logger.

For set-up and download of data, the L481 logger has a USB 2.0 interface for connection to a standard Windows PC. The free DataView® software included with the unit provides a very simple way to configure the logger, view real-time data, download and plot stored data and generate standard or custom reports. It also allows the measured data to be scaled to custom engineering units and can synchronize multiple loggers to record at the same time.

  • Rail voltage monitoring
  • Battery testing
  • Power supply monitoring
  • Windmill monitoring
  • Intermittent voltage fault detection


Channels One
Input Connection Two recessed 4mm saftey banana jacks
Measurement Range ±850V DC
Resolution 0.1V
Accuracy(50/60Hz) 0 to 5V: unspecified
5 to 50V: ±(0.5% of Reading + 1V)
50 to 850V: ±(0.5% of Reading + 0.5V)
Sample Rate 8 samples/storage internval
Storage Rate Programmable from 125mS to 1 day
Storage Modes Start/Stop Mode
First In First Out Mode (FIFO)
Extended Time Recording Mode (XRM)
Recording Length 15 minutes to 8 weeks, programmable using DataView
Memory 240,000 measurements (512KB) The recorded data is stored in non-volatile memory & retained even if the battery is low or removed.
Communication USB 2.0 optically isolated
Power Source 2 x 1.5V AA-cell Alkaline batteries
Battery Life 100 hours to >45 days (dependent on storage rate/recording length)
Dimensions 4.94 x 2.75 x 1.28″ (125 x 70 x 32mm)
Weight (with battery) 6.4 oz (181 grams)
Case UL94-V0
Vibration IEC 68-2-6 (1.5mm, 10 to 55Hz)
Shock IEC 68-2-27 (30G)
Drop IEC 68-2-32 (1m)

Recording Modes

Start/Stop Mode

In this mode the operator selects a storage rate from predefined values from 8 per second to 1 every day, then selects a start and stop time. Data is recorded at this rate until the memory is filled or the end recording time and date is reached. The logger then stops recording and goes into standby mode retaining the recorded date.

First In First Out Mode (FIFO)

The operator makes the data storage and recording length selections as described above. If the memory fills before the end date and time occurs, the logger will discard the oldest stored data point and add a new one. This process will continue until the end recording date and time is reached.

Extended Time Recording Mode (XRM)

This unique recording mechanism provides for continuous recording over a longer period of time without the need for the operator’s selection or adjustments. The operator selects a starting storage range from predefined values from 8 per second to 1 every day and a recording length. The logger will store data at the rate selected until the memory is filled. The logger will then discard every other stored sample beyond the first one, freeing up half the memory for continuous recording. New samples will be stored at half the previous storage rate, matching the interval with the remaining stored data. This process will repeat each time the memory fills until the operator stops the recording manually, the end recording date and time is reached or the battery runs down.