Introduction – Fredenstein U70F User Manual
Page 3
Fredenstein U70F Peak Programme Meter
Fredenstein U70F Manual V2.1 July 16, 2014 Page 2
Introduction
Congratulations to your new U70F 2‐channel Peak Programme Meter (PPM). The name is
the homage to the first PPM meter called U70, a tube based system developed and
anufactured in Germany in the early 50s. Our new design uses advanced DSP
echnologies for improved performance and offers the following features:
m
t
Î
XLR balanced inputs and outputs
Î
The audio pass through feature simplifies the connection of the U70F
Î
Independent 60 LED scales with five Illuminated scale markers per channel.
(Nonmultiplexed for flickerfree operation)
Î
dB linear scales for improved readability
Î
Switchable scales: 39 dB to +20 dB with a linear resolution of 1 dB per step or
19.5 dB to +10 dB with a linear resolution of 0.5 dB per step
Î
Selectable Dot or Bar display characteristics
Î
Selectable PeakHold functions with hold times of 2.5s or indefinitely with
manual reset
Î
Display modes:
PPM Bar Mode,
PPM Dot Mode,
RMS Bar Mode,
PPM Dot and RMS Bar Mode (default) operated simultaneously
Every mode supports the additional Peak Hold feature.
Î
Integrated universal powersupply (90 – 240 VAC, 50 – 60 Hz) with IEC connector
Î
Rackmount or tabletop operation
Î
Standard 19 inch 1U nclosure
PPM metering is more important than ever in modern digital recording since A/D
converters do not clip gracefully at all. VU metering is too slow and unable to correctly
display transients and other complex waveforms. Monitoring the recording levels after
the A/D conversion in the digital domain cannot show any “overs” and will give false
readings. The U70F offers a high quality solution to these problems, latency free true
over‐sampled peak metering. In addition, the simultaneous true RMS feature allows the
recording/mastering engineer to judge the “loudness” of the program. This especially
important to insure the program will be on par with others when playing on radio/ TV
stations, internet streams or portable music players. The peak hold feature with manual
reset allows users to read the maximum peak value of a complete program.
e