Meter Voltmeter
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Meter Voltmeter

Quadrature Amplitude Modulation (Qam) Analysis Meter For Dvb Systems
Toronto, Canada – GAO Instruments has released a practical QAM analysis meter operating over a wide frequency range of 5MHz to 870MHz with a resolution of 10kHz. It is intended for the installation and maintenance of Digital Video Broadcasting (DVB) systems. The quadrature amplitude modulation (QAM) analyzer measures and displays parameters such as channel power, MER and BER, the signal level of DVB networks at a specific frequency or any carrier within the system range. This QAM analysis meter, model A0500005, complies with DVB-C and ITU J.83, Annex A standards. It features C/N measurement, return path tests, voltmeter functionality, spectrum analysis, data logging, analog TV measurement and DVB power measurements including QAM, QPSK and COFDM. The portable analyzer efficiently and accurately tests analog, QAM and FM channels and also functions as a voltmeter. It boasts intelligent power management, fast setup, alphanumeric input and easy transfer of test data to a PC or printer. This technologically advanced QAM supports up to 150 channels scan. Visit http://www.GAOInstruments.com for more information or to purchase this product online. For any sales inquires please contact: 1-877 585-9555 ext. 601 – Toll Free (USA & Canada) 1-416 292-0038 ext. 601 – All Other Areas sales@gaoinstruments.com About GAO Instruments GAO Instruments (www.GAOInstruments.com) is a global leader in research, development and manufacturing of high performance telecommunication testers, electronic measurement instruments and other test and measurement devices.
Toronto, Canada – GAO Instruments has released a practical QAM analysis meter operating over a wide frequency range of 5MHz to 870MHz with a resolution of 10kHz. It is intended for the installation and maintenance of Digital Video Broadcasting (DVB) systems. The quadrature amplitude modulation (QAM) analyzer measures and displays parameters such as channel power, MER and BER, the signal level of DVB networks at a specific frequency or any carrier within the system range. This QAM analysis meter, model A0500005, complies with DVB-C and ITU J.83, Annex A standards. It features C/N measurement, return path tests, voltmeter functionality, spectrum analysis, data logging, analog TV measurement and DVB power measurements including QAM, QPSK and COFDM. The portable analyzer efficiently and accurately tests analog, QAM and FM channels and also functions as a voltmeter. It boasts intelligent power management, fast setup, alphanumeric input and easy transfer of test data to a PC or printer. This technologically advanced QAM supports up to 150 channels scan. Visit http://www.GAOInstruments.com for more information or to purchase this product online. For any sales inquires please contact: 1-877 585-9555 ext. 601 – Toll Free (USA & Canada) 1-416 292-0038 ext. 601 – All Other Areas sales@gaoinstruments.com About GAO Instruments GAO Instruments (www.GAOInstruments.com) is a global leader in research, development and manufacturing of high performance telecommunication testers, electronic measurement instruments and other test and measurement devices.
About the Author
GAO Instruments (www.GAOInstruments.com) is a global leader in research, development and manufacturing of high performance telecommunication testers, electronic measurement instruments and other test and measurement devices.
How does putting a volt meter in circuit affect total voltage?
When you attach a voltmeter to measure voltage, it has internal resistance which affects the total voltage, right? Does the voltage go higher than the source voltage or lower? And why?
...and what about current and resistance?
Eric is right that the voltmeter should not change the circuit much, but it can change the voltage if you are measuring across a high-value resistor in series with another one. Most digital meters have about 10 megohms resistance on all ranges. Analog meters have a resistance that increases with the range: a typical value is 10,000 ohms/volt, which would give a resistance of 10 megohms on the 1000 volts scale. If the voltmeter is changing the resistance of the circuit, you will get a lower reading than you should. Of course, the voltmeter is reading correctly, but it is changing the voltage in the circuit.
When you are on the current range, the resistance of the meter is very low, and you should be measuring in series with the load. Most digital meters will have a voltage across the meter of about 100 millivolts. Here again, if you are measuring high currents, the meter's resistance will be enough to reduce the current in the circuit and give you a lower reading than you would have without the meter.
There is no loading problem when you are measuring resistance, but make sure that power is not applied to the circuit, or your readings will not mean anything, and you may damage the ohmmeter.
How to Install a Basic Volt Meter Video












































