© 2003 Wohler Technologies Inc. ALL rights reserved
20
ATSC/DVB-3/SDI User Manual P/N 821557 Rev-A
Section 3: Technical Information
Level Meter Specifications
Level meter type:
Segment quantity:
Level Meter Scale:
Dynamic Range:
Midscale Resolution:
Bargraph Length:
LED segment size:
LED segment pitch:
Segment display color:
Peak emission wavelength:
Segment brighness, (If = 20 mA):
Segment brightness, uniformity:
Adjacent segment "Off" brightness:
LED bargraph
53
0 to -66 dB
65 dB
1 dB
2.22" (56.4 mm)
0.14" x 0.028" (3.57 x 0.7 mm)
0.041" (1.05 mm)
Tri-color (red, amber, green)
Green: 570 nm, Red: 630 nm
3.5 mcd
<10% difference between segments
<1% of brightness of active segment
LED Bargraph Level Meter Specifications
Description
The 53-segment type of tri-color LED bargraph display has a total length of 2.24" (56.8 mm) and uses relatively small segments. This
high resolution segment size is easy to accurately visually monitor for distances up to six feet (1.8 meters). Segment size is 0.158" (4
mm) x 0.04" (1 mm). Segment pitch is 0.039" (0.99 mm).
Each LED bargraph display section visually indicates the dynamic changes within the audio signal source(s) being monitored. All
bargraph LED segments are of the tri-color type (green, amber, red). Ballistics for these meters are factory set to display a single
floating
PPM 'dot'
(continuous decay of 20 dB in 1.5 seconds) above a
VU bar
; each segment's color being fixed according to its
position on the scale. Level gain is factory set at +4 dBu. Dynamic range for these meters is 65 dB.
Scales
Please refer to the figure below for an illustration showing the standard scale for the 53-segment bargraph display used in the
ATSC/
DVB-3/SDI
digital audio monitor. Custom variations of this scale are also available by special order.
10
10
46
46
56
66
51
51
66
56
28
34
42
38
31
18
25
20
22
16
13
28
31
42
38
34
16
13
25
20
22
18
0
7
4
2
0
7
4
2
