Wohler ATSC/DVB-3/SDI User Manual page 20

ATSC/DVB-3/SDI User Manual P/N 821557 Rev-A
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.
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:
20
Level Meter Specifications
0
2
4
7
10
13
16
18
20
22
25
28
31
34
38
42
46
51
56
66
LED Bargraph Level Meter Specifications
© 2003 Wohler Technologies Inc. ALL rights reserved
0
2
4
7
10
13
16
18
20
22
25
28
31
34
38
42
46
51
56
66
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
Section 3: Technical Information