Log4 USB

The best power logging device
available on the market.


About The Log4 USB

The Log4 USB is a circuit measurement tool which both display accurate readings of voltage, current, and power while also simultaneously logging all measurement data to a MicroSD card and/or the free dedicated PC software.

The Log4 USB device is specifically designed to measure the low positive voltages of USB connected equipment with high accuracy.

Log4 USB

Features




Graphic Display

Each Log4 can display readings in both numeric and graphic formats, with a high refresh rate, and very low power consumption. The display offers great sunlight readability and includes an adjustable backlight for low light viewing.

Battery Powered

Each Log4 device is independently powered by a compact internal lithium polymer battery. This allows for measurement with greater accuracy as the Log4 itself draws no power from the supply of the device you test.

Alarms

Alarm thresholds can be optionally set to trigger both audible and visual alarms. The communications protocol also allows for seamlesss event-based broadcast of these alarms.

Open Protocol

Data is streamed from the Log4 via both USB and TTL level serial connections. The format of the transmitted data is an open protocol which can be utilized by devices such as an Arduino or Raspberry Pi.

Isolated Serial

Both data terminals are isolated from the measurement connections so that the connected PC and the devices being tested are protected from potential earth loops and voltage spikes.

.csv file Format

Logged session data is recorded to a micro-SD card in standard .csv format. Your data can be readily opened, reviewed, edited, and plotted using standard spreadsheet applications.

Terminal Connection

Alternate connection can be made via spring terminals so that you can wire the Log4 directly into a circuit and test a wider range of voltages in numerous other measurement applications.

Desktop Application

Each Log4 partners with a freely downloadable desktop application that supports both Mac and PC plaforms. This software can be used to display detailed real-time graphical and statistical information.

Specifications





Measurement

Range:
Auto Ranging
Resolution:
16 bit, PGA Enhanced
Channels:
1


Voltage measurement
Maximum:
28V
Minimum:
0V

Current measurement
Maximum:
3000mA
Minimum:
100uA

Sampling

Range:
Adjustable
Timestamp:
Realtime Clock,
User/Auto-set,
Date & Time


Sampling period Limits
Maximum:
60 minutes
Minimum:
1 millisecond

Battery

Chemistry:
3.7V, 1-cell Lithium Polymer
Capacity:
1200mAh
Battery Life:
7.3 days @ 10ms sampling
Charging:
200mA/h, Isolated,
via MicroUSB port

Inputs & Outputs

Measurement connections
USB 3.0:
Type A IN, Type B OUT
Terminals:
Spring Terminals,
1.5mm Wire Gauge


Isolated data interface
USB:
Micro-USB, Type B
USART:
Standard 100mil Header,
3V3 & 5V logic compatible

Standalone logging
Media:
MicroSD Card

Alarms

Types:
Visual - LED (Bi-colour)
Audible - Integrated Buzzer
Thresholds:
OVER - Voltage, Current, Power
UNDER - Voltage, Current, Power

Display

Resolution:
128 x 128 Pixels
Color Depth:
Monochrome
Technology:
Sharp Memory LCD
Backlight:
Discrete, Adjustable

Size & Weight

Dimensions:
85.7 x 65.0 x 28.4
(W x D x H, mm)
Weight:
121 grams
Note: Specifications are preliminary and subject to change. See Kickstarter for details.

Software



PC

Version: 0.1.210 (BETA)

System requirements

PC running Windows xp sp3 or higher
32bit Java Runtime (included)

DOWNLOAD 
PC 

MAC

Version: 0.1.214 (BETA)

System requirements

MAC running OS X 10.6.8 or higher
32bit Java Runtime

DOWNLOAD 
Mac 

Documentation


Datasheet
19/07/2017
PDF

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