User manual

© 2001 Wohler Technologies Inc. ALL rights reserved
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AMP2-V2DA User Manual P/N 821539 Rev-A Section 3: Technical Information
Level Meter Settings and Specifications
Level Meter DIP Switch Settings
A DIP switch module, accessed through holes in the top cover, allows the user to set the Bargraph Display Mode and Meter Input Gain
Calibration. There is one DIP switch module for each pair of meter bargraphs. There are four sections (1, 2, 3, 4) on each DIP switch
module. The first two sections (1, 2) are for setting the Meter Input Gain Calibration and the second two sections (3, 4) are for setting
the Bargraph Display Mode.
Meter Input Gain Calibration Settings:
DIP switch sections 1 and 2 set the Meter Input Gain Calibration, which determines the level of the input signal (after digital to analog
conversion) that will result in a "0" reading on the meter bargraphs. The factory setting is +4 dBu, but can instead be set for 0 dBu, +6
dBu, or +8 dBu by the user. See the diagram below for settings.
Bargraph Display Modes:
DIP switch sections 3 and 4 (S3 and S4) determine how peak levels are displayed (Display Mode). S3 selects either the "PPM" mode
or an auto-reset "VU Peak" mode (NOT the PPM value!). If S3 is set for PPM mode, S4 determines whether it is displayed in the
original "floating PPM dot" mode (no Hold, continuous decay of 20 dB in 1.5 seconds) or as a 3 second auto-reset Hold. When S3
is set for "VU Peak", S4 sets the Hold time to either 3 or 10 seconds. The factory setting is PPM Decay mode (no Hold, continuous
decay of 20 dB in 1.5 seconds). See the diagram below for settings.
53-Segment
Bargraph Scale
Level meter type:
Segment quantity:
Meter display modes (DIP switch selectable):
PPM characteristics (DIP switch selectable):
VU characteristics (DIP switch selectable):
Level gain (DIP switch selectable):
Level meter scale:
Dynamic range:
Midscale resolution:
Bargraph Length:
LED segment size:
LED segment pitch:
Segment display color:
Peak emmision wavelength:
Segment brighness, (If = 20 mA):
Segment brightness, uniformity:
Adjacent segment "Off" brightness:
LED bargraph
53
VU (bar)
or PPM (dot)
20 dB decay in 1.5 seconds
or 3 second hold
3 second hold
or 10 second hold
0, +4, +6, +8 dBu
+16 to -50 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
Gain Calibration
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0 dBu +4 dBu
21
+6 dBu
21
+8 dBu
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Display Mode
4
PPM
3 Sec Hold
3 434343
PPM
Decay
VU Peak
3 Sec Hold
VU Peak
10 Sec Hold
Installation Note: The Meter Input Gain Calibration/Bargraph Display Mode DIP module(s) is accessible through openings in the
top cover of the unit. Any adjusments to DIP switch module(s) should be performed before installing the unit into an enclosed rack.
LED Bargraph Level Meter Specifications