Logitek ULTRA-VU, Operation & Service Manual

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SECTION 1— GENERAL INFORMATION
1-1 General Description
The Logitek Ultra-VU is a bargraph type audio me-
ter featuring two tricolor LED bargraphs with clip indi-
cators. Two function buttons and several auxiliary
data indicators are also included on the front panel.
1-2 Electrical Specifications
Bargraphs per meter: Two
Indicators per bargraph: 63
Normal Range: -70 dB to 0 dB plus clip - digital
-50 dB to + 20 dB plus clip - analog
Fine Range: .2 dB per segment around ref pt.
Reference Point: -10,-12,-14,-16,-18 or -20 dB
Peak Markers:
8,9,10,12,14,16,18 dB above ref pt
Ballistics:
VU Mode 300 mS/20dB attack & release
PPM Mode 0 mS attack, 2.8S/24dB release
Peak Hold 0 mS attack, 2 or 5 Second hold
Max Hold 0 mS attack, pushbutton release
Image/Phase 4 Sec hold on max image
Clip Indicator: trigger on 1 or 4 consecutive
clipped samples
Frequency Response:
Normal +/-.1 dB 20 Hz - 20 KHz
Loudness Filter 58 dBSPL auditory curve
-40 dB 20 Hz, 0 dB 1250 Hz, -50 dB 20 KHz
Brightness control: 8 levels
Analog Input:
Sensitivity -10 to +20 dBu for full scale
rear panel adjustable
Overload Level +24 dBu
Impedance 40 Kohm balanced
Connector 3-pin XLR
Digital Input:
Formats AES/EBU or S/PDIF
Impedance 110 Ohm (XLR)
75 Ohm (coax adapter)
Pass-through 2200 Ohm (XLR)
Termination transformer balanced
AC Line Input Voltage:
50-60 Hz 105-129 VAC or
(switch settable) 220-240 VAC
Power Requirement:
UV1-(all), UDT-(all) 10 Watts
UV2-(all) 20 Watts
Dimensions:
1RU enclosure 19" W x 7" D x 1
3
4
’
H
Desk top enclosure 8
1
4
“ W x 9" D x 2
1
4
” H
1-3 Standards
The Ultra-VU meters are designed to conform to
the ballistic standards described in IEEE document
G.2.1.2/13, IEC document 268 and EBU document
3205-E. This ensures that the bargraph motion will
closely track other standard mechanical and elec-
tronic meters.
The one exception to these standards is the PPM
attack time. The Ultra-VU uses a true peak measure-
ment scheme that always displays the highest peak
of the input signal. The PPM standard specifies a
short averaging period for peak signals that keeps
sounds with durations too short to be heard well from
being displayed, no matter how loud they are. The de-
lay also allows mechanical meters to keep up with
fast changing inputs. Under most circumstances
there is no noticeable difference between true peak
and PPM peak readings. However, if you do need the
Ultra-VU to conform to the PPM peak standard then
please contact the Logitek factory for further informa-
tion.
1-4 Instrument Identification
The Ultra-VU is identified by a model number and
a three or four digit serial number. The model number
and serial number appear on a label on the back of
the unit near the power cord. All correspondence to
your Logitek dealer or to the Logitek factory should
refer to the model number and serial number.
1-5 Where to Find Help
Logitek customer service personnel are available
to help with any questions, comments or problems
you might have with the Ultra-VU meter, both during
and after the warranty period. Our hours of operation
are 8AM to 5PM central time. We may be contacted in
one of the following ways.
By Phone: 877-231-5870 (USA & Canada)
or 713-664-4470
By Fax: 713-664-4479
By Email: help@logitekaudio.com
By Mail: Logitek Electronic Systems, Inc.
5622 Edgemoor Drive
Houston, Texas 77081
USA
** Ultra-VU Operation & Service Manual ** Page 4