Audio Level Meter
Contents
1. PPM 10 ms attack time to 90 1 5 s decay time for 20 dB VU 300 ms attack and decay time to 99 resp 1 1 25 over and undershoot Scale Logarithmic 31 dB to 5 5 dB Sensitivity Adjustable from 5 dBu 1377 mV to 10 dBu 245 mV for 0 dB scale display 5 2 Connections 5 2 1 Inputs LINE I O Two pairs of RCA jacks paralleled for loop through of stereo signals Impedance 133 KQ Max input voltage 10 Vpp for undistorted measurements 5 3 Power Supply Connector Low voltage connector barrel jack 5 5 2 1 mm lockable Operating voltage 12 Voc Current consumption Less than 1 5 A 5 4 Housing Material Steel powder coated surface front panel 5 mm aluminum Dimensions Depth 172mm without connectors Width 140 mm Height 40mm without stands Height 50mm with stands Weight Audio Level Meter 875g Power supply 160g SBAudio 30 25 20 15 10 S Mudio L TTT OUT l l l l PPM 30 25 20 15 10 Sg i l l I j LEVEL METER R HIE 30 25 20 15 28 lt AUDIO SSB Audio 2015 07 26 SSB Audio GmbH Sonnenweg 25 30827 Garbsen Germany G www ssb audio com2. SB GERMANY Audio Level Meter Connecting and Operating 30 25 20 I5 Mudio VU PPM AUDIO LEVEL METER Contents 1 2 3 SAFETY GUIDELINES READ BEFORE USINGl cccsccccssscccssssecessssecesssseeeessssescsssnsecsssueeeseeaes 2 Ietdeelel de e WE 3 CONE e cece tise ccc nce ccc cu so cc eu aatap cate ce estcn beatae cca E cate eeteentmca ua meteepene 3 3 1 FONT ee E 3 3 2 HNE IMs sn n a e a E E E E 4 UNE ET 4 4 1 PPM and VU Mode Selection E 4 4 2 PN OU SS gn EE 4 4 3 Bar Display and DOCDISDIAY EE 5 4 3 1 Peak Hold Bar Display Mode only 5 4 3 2 Yellow Dot Dot Display Mode only 0 ee cccssssscccsesscesceesesssescecsessseeceeesssseeceeesesseeseesaesas 5 4 4 Be Ten e 6 4 5 BAC dE 6 WS ent e Re E 7 5 1 NIC ASU CIV SIS ciresccceccentccetventeceacentccetvenceceacentccuteventecaavantesiesentecaevenicaineente O 7 5 2 CE O eege 7 eA E o E E E EE E E EE EE E EE EET 7 5 3 Power He e 7 5 4 Reif IK 7 SBAudio 1 SAFETY GUIDELINES READ BEFORE USING The device meets protection class 2 and has left the factory in a technically faultless state In order to assure this state and to insure riskless operation the user must obey the notes and warnings which are part of this manual SAFETY RELIABILITY AND PERFORMANCE OF THIS DEVICE ARE GUARANTEED ONLY WHEN e Installation expansions modifications and repairs are accomplished only by the manufacturer or by personal authorized by the manufacturer
3. and 1 5 s decay time for 20 dB or VU evaluation 300 ms attack and decay time to 99 resp 1 e Sensitivity for 0 dB scale adjustable from 5 dBu 1377 mV to 10 dBu 245 mV in 16 steps of 1 dB each e Dot or bar display selectable e Peak hold function selectable for bar display e Yellow or green yellow red dot selectable for dot display e Background illumination all passive LEDs dimmed on selectable e Brightness adjustable in 4 steps over a wide range Connection and operation of the Audio Level Meter is quite obvious particularly for those users who have been concerned for many years with the technology of their equipment 3 Connection ANALOG 1 PP VU L 2 G 1dB 3 G 2dB MADE IN GERMANY 4 G4dB erst e a O oL POWER 12V 1 5A LINE I O LINE I O CONFIG 10 BRT2 3 1 Power Supply The included 12 volt power adapter can be connected to the Audio Level Meter with a lockable connector Rotate the plug clockwise so that that it cannot be accidentally disconnected POWER 12V 1 5A The Audio Level Meter is turned on by pressing the POWER switch The operation is indicated by the illumination of one of the two LEDs VU or PPM on the front panel de A 3 2 Line Input Output The audio signals can be connected to any of both RCA stereo jack pairs and looped to another device through the other RCA stereo jack pair They ought to have a level between 10 dBu 245 mV and 5 dBu 1377 mV for a reading of 0 dB an
4. d they are loaded very weakly by 133 kQ only 4 Settings 4 1 PPM and VU Mode Selection Switch 1 Mode MADE IN GERMANY OFF PPM ON VU APEM FRANE 4 5 ee d 8 Sit The selected mode is also indicated on the front panel CONFIG 10 BRT2 Some background information about VU and PPM measurements In both modes a constant sine wave tone is indicated with the same level But as soon as it is no constant sine wave any more the measured values in both modes are very different For VU meters the ballistic characteristic is specified as follows The attack time is 300 ms for a value of 99 of the final value with a succeeding overshoot of 1 to 1 5 The decay behavior is identical Thus VU measurements are quite slow and do not respond quickly to peaks in the signal VU measurements were in early times used in broadcast studios Also in HiFi equipment the meters are called VU meters but usually do not feature the specified ballistic behaviors The PPM attack time is specified as 10 ms for a value of 90 of the final value This is quite fast much faster than VU For good reasons the decay behavior is completely different It is specified as 20 dB in 1 5 seconds Otherwise the level of a short peak would be invisible PPMs were introduced much later and due to their much better responsitivity they displaced the VU meters in studios completely gt In practice for real audio programs measured PPM values are a couple of dB higher than thos
5. e The electrical installations of the relevant room meet the corresponding IEC ANSI requirements e The device is used in accordance with this user manual POWER SUPPLY The device is designed for continuous operation The power supply s operating voltage must meet the local line voltage Avoid connections to the power supply system in junction boxes together with many other devices The electrical outlet needs to be installed close to the device and easily accessible Use the supplied power supply unit Other power supplies may cause malfunctions or even damage the device INSTALLATION SITE The device should stand only on clean horizontal work surfaces or be installed in a suitable rack During operation the device must not be exposed to vibration Humidity liquids of all kinds and dust must be kept away as far as possible Sufficient ventilation needs to be provided Avoid direct sunshine and the proximity of radiators and radiant heaters SBAudio 2 Introduction This Audio Level Meter is an analog stereo VU Volume Unit meter and PPM Peak Program Meter with 2 LED bars containing 51 bi color LEDs each PPM and VU measurements are performed widely meeting the according studio standards The analog signals to be metered can be looped through the Audio Level Meter Different settings can be performed with a 10 fold switch on the rear side e Two sets of paralleled input jacks RCA e PPM evaluation 10 ms attack time to 90
6. e of VU meters In the Audio Level Meter for both modes the specified ballistic characteristics are precisely met For the scale a compromise is chosen in order to achieve a common scale for both modes VU meters shall have a linear scale ranging from approx 20 dB to 3 dB while the scales of PPMs are logarithmic and moreover scale ranges are internationally differently standardized As the Audio Level Meter can work in both modes the compromise is that the scale for both modes is logarithmic and reaches from 31 dB to 5 5 dB 4 2 Input Sensitivity The input sensitivity for a reading of 0 dB can be adjusted in 16 steps of 1 dB each from 10 dBu 245 mV to 5 dBu 1377 mV SBAudio Switch Position Sensitivity for 0 dB 2 3 4 5 dBu mV OFF OFF OFF OFF 5 1377 ON OFF OFF OFF 4 1228 OFF ON OFF OFF 3 1094 ON ON OFF OFF 2 975 OFF OFF ON OFF 1 869 ON OFF ON OFF 0 775 OFF ON ON OFF 1 690 ON ON ON ON 2 615 OFF OFF OFF ON 3 548 ON OFF OFF ON 4 489 OFF ON OFF ON 5 436 ON ON OFF ON 6 388 OFF OFF ON ON 7 346 ON OFF ON ON 8 308 OFF ON ON ON 9 275 ON ON ON ON 10 245 4 3 Bar Display and Dot Display Switch Position Display Option 6 7 OFF OFF Bar No Peak Hold OFF ON Bar With Peak Hold ON OFF Dot Dot Color Corresponding to Value ON ON Dot Dot Color Always Yellow In bar display mode when no LED is illuminated the level is lt 31 dB In dot display mode always one LED is illuminated thus the leftmost LED indicates
7. that the level is lt 30 dB In both display modes when the rightmost LED is lit it means that the level is gt 5 5 dB 4 3 1 Peak Hold Bar Display Mode only Often a peak hold function where a measured peak value is displayed over a certain time by an illuminated LED proves to be useful Because you do not have to look so closely short peaks can be recognized easier The peak hold time is 1 second and can be enabled with switch 7 on when the bar display mode is activated 4 3 2 Yellow Dot Dot Display Mode only In dot display mode E le When switch 7 is on the dot appears in yellow independent of its position on the scale When switch 7 is off the dot appears either in green yellow or red depending on the measured value 4 4 Background Without background only the LEDs for the measured values are illuminated With background all other LEDs are illuminated weakly too so that the full scale is visible even in darkness Switch 8 Background OFF Off ON On 4 5 Brightness The LEDs can be adapted in their brightness to the user s individual preferences in 4 relatively big steps so that even in very bright environments the display is clearly readable or vice versa in very dark environments the display will not be annoying Switch Position Brightness 9 10 OFF OFF 100 ON OFF 25 OFF ON 6 ON ON 1 5 E le 5 Technical Data Errors and technical modification subject to change 5 1 Measurements
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