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Open and Practice Measurement with PC. |
Updated:25.12.2009
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USB devices
Wireless devices
Web devices
USB Voltmeter 0 - 50 V
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
Power suply : from PC via USB connector Software : USB Measure + API ( build your own application) Paralel
connecting : up to 127 devices connected is
possible |
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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
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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.
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.
This page is still presented these voltmeters : web votmeter and wireless voltmeter.