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One audio projects ERMSDCV2 User Manual

Dc..1mhz rms to dc converter, 85db logarithmic output voltmeter & 80db 10hz...100khz low noise amplifier
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Document Revision
Date
A
03/2011
1)
What is it ? ..................................................................................................................... 2
2)
Instrument overview ...................................................................................................... 2
2.1)
Functional diagram ....................................................................................................................... 2
2.2)
Front panel description ................................................................................................................. 3
(1)
Input coupling switch: ...................................................................................................................................................... 3
(2)
RMS and logarithmic voltmeter input: ............................................................................................................................. 3
(3)
RMS/LOG voltmeter input overload led indicator ............................................................................................................. 3
(4)
LNA input overload led indicator ...................................................................................................................................... 3
(5)
LNA input ......................................................................................................................................................................... 3
(6)
Power ON led indicator .................................................................................................................................................... 3
2.3)
Rear panel description .................................................................................................................. 4
(1)
LNA output ....................................................................................................................................................................... 4
(2)
DC supply input ............................................................................................................................................................... 4
(3)
Logarithmic voltmeter output .......................................................................................................................................... 4
(4)
RMS voltmeter output ...................................................................................................................................................... 4
3)
RMS/DC and LOG voltmeter operation. .......................................................................... 5
4)
Low noise amplifier (LNA) operation. ............................................................................. 5
5)
Technical specifications .................................................................................................. 6
5.1)
True RMS voltmeter ...................................................................................................................... 6
5.2)
Logarithmic voltmeter .................................................................................................................. 6
5.3)
80dB Low noise amplifier ............................................................................................................. 6
USER MANUAL
USER MANUAL
ERMSDCV2
DC..1MHz RMS to DC converter, 85dB Logarithmic output
voltmeter & 80dB 10Hz...100kHz low Noise Amplifier
Modifications
Initial manual
ERMSDCV2 front and rear panel view
Contents
Page 1/7
ERMSDCV2_Manual.odt
OnEAudioProjects
contact@oneaudio.net
www.oneaudio.net
Author
ON

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Summary of Contents for One audio projects ERMSDCV2

  • Page 1 RMS/DC and LOG voltmeter operation................5 Low noise amplifier (LNA) operation................5 Technical specifications ....................6 5.1) True RMS voltmeter ........................6 5.2) Logarithmic voltmeter ........................6 5.3) 80dB Low noise amplifier ......................6 ERMSDCV2 front and rear panel view Page 1/7...

  • Page 2: Instrument Overview

    1) What is it ? The ERMSDCV2 is a small box that includes some very useful functions for electronics design and test, especially in audio domain. It's main function is a precise wide bandwidth RMS voltmeter. The RMS conversion is performed using state of the art RMS to DC converter IC, the LTC1968 from Linear Technology.

  • Page 3: Front Panel Description

    2.2) Front panel description (1) Input coupling switch: The input coupling switch allow to select the type of voltage measurement. In “AC” mode, only RMS value of the AC part is computed. In “AC+DC” mode, it's the RMS value of the AC and DC part of the input voltage that is computed. (2) RMS and logarithmic voltmeter input: This is the common input of the RMS and Logarithmic voltmeter(BNC female connector).

  • Page 4: Rear Panel Description

    The input voltage can be between +/-7V to +/-12V. The required minimum current for each rail is about 150mA. It is recommended to use clean power supply for proper operation of the ERMSDCV2, especially for the LNA section that is noise sensitive. For this reason, switching mode power supplies (SMPS) should be avoided.

  • Page 5: Rms/Dc And Log Voltmeter Operation

    The application note AN83 from Linear Technology describing the test procedure with low noise amplifier can be read for further information. The ERMSDCV2 is widely inspired from various schematics published in LT Applications notes. The LNA can work together with the RMS/LOG voltmeter. The LNA output has to be connected to the RMS input.

  • Page 6: Technical Specifications

    5) Technical specifications All tests performed with +/-9Vdc linear power supply. Typical value measured on prototype board. 5.1) True RMS voltmeter Parameter Unit Input impedance MΩ Input capacitance Linearity (250mV to 2.5V range f=1kHz) Input voltage range (error<5%, No probe) 0.01 Vrms 0.014...
  • Page 7 END OF MANUAL Copyright OnE Audio Projects 2011 www.oneaudio.net contact@oneaudio.net Related OnE Audio Design : EOSC10KV2, ultra low THD (-120dBc) 10kHz reference oscillator. AA5381V1, 24bits/192kHz stand alone high performance Analog to Digital converter. EHAMP08, Remote controlled TPA6120 based headphone amplifier.

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