USB voltmeter is a small module with
good electrical properties. Voltmeter is connected with the PC via USB
cable and is also powered via this cable. Voltage values are displayed
on the monitor of a PC or notebook. Voltmeter has a high input
resistance and very good accuracy of
measurement.
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USB Voltmeter
Range : 0 - 50 V
| Usage
: |
Technical
parameters: |
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Designed for quick and easy measurement of DC voltage in range 0 - 50V.
Voltage values are displayed on the monitor of a PC. |
Size :
Impedance :
Lienarity :
Speed : |
45 x 50 mm
1 MOhtm
0,2 %
20 times/sec
|
Power
suply : from PC via USB connector
Software
: USB Measure + API ( build your own
application)
Paralel
connecting : up to 127 devices connected is
possible
|
This voltmeter is
galvanically connected
with a
PC. Version with the full galvanic isolation is also supported. USB
voltmeter has only one input and only one voltage can be
measured. It is possible to simultaneously connect up to 127
USB
voltmeters. Instalation of USB voltmeter is easy and completely
automated. More about in the instalation page.
Software + API
Software.
Software in the PC communicates with the USB device and display data on
the monitor.
Once installed it is already capable to work immediately.There is no
need for settings.
Software can communicate with multiple USB device at the same time. It
also allows logs measured data into log file.
COM component.
For developers is supplied COM component, that enables to create own
applications.
COM
component works with all popular languages like visual basic, C/C++,
C#, javascript etc. More info are in help and in the software page.
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USB Voltmeter block diagram
1. Preamplifier.
At the input of voltmeter is a voltage divider, consisting of
resistance. Followed by quality amplifier with operating amplifier
OP777. This amplifier process the input signal to the level required
for A/D converter in the PIC16F886.
2. Microcontroller as voltmeter.
Voltage measurement are performed in the processor PIC16F886,which
includes 10-bit internal A/D converter. Measurement is approximately 20
times/sec . Procesor PIC16F886 also managed to send the measured data
to the PC.
3. USB interface and PC communication.
Connection with PC is implemented by using USB converter with FT 232RL.
FT 232RL is a reliable converter from USART to the USB protocol. It uses
its own APIs and offers a lot of capacity for communication PC with a
USB device.
More picture
Another voltmeters.
This page is still presented these voltmeters : web votmeter and
wireless voltmeter.