© 2003 Wohler Technologies Inc. ALL rights reserved
17
AMP2A-4S
and
AMP2A-10S
User Manual P/N
821554
Rev-
B
Section 3: Technical Information
Level Meter Settings and Specifications
Level Meter DIP Switch Settings
Two DIP switch modules, accessed through holes in the top cover, allow the user to set the
VU/PPM Display Mode
and
Input Level
Gain Calibration
. There are two DIP switch modules; one for
each
of the two meter bargraphs. There are four sections (
1, 2, 3, 4
)
on each DIP switch module. The first two sections (
1
and
2
) are for setting the level meter
Input Level Gain Calibration
and the
second two sections (
3
and
4
) are for setting the
VU/PPM Display Mode
.
Input Level Gain Calibration Settings:
DIP switch sections
1
and
2
set the level meter
Input Level Gain Calibration
, which determines the level of the input signal that
will result in a "0" reading on the meter bargraph. The factory setting is +4 dBu, but can be set for -6 dBu, 0 dBu, or +8 dBu by the
user. See the diagram below for settings.
Calibration Note:
Each bargraph segment will turn on at 0.5 dB before that segment’s silk-screened scale indication. Example:
When the gain calibration is set for +4 dBu, the zero indication on the level meter will light up at 3.5 dBu. Calibration is implemented
in this way to effect a “rounding” function for more accurate indication of signal levels which occur BETWEEN the thresholds of any
two bargraph segments.
Bargraph Display Modes:
DIP switch sections
3
and
4
determine how levels are displayed (
PPM
or
VU
mode characteristics). The factory setting is
VU
. See
the diagram below for settings.
Level meter type:
Segment quantity:
Meter display modes (DIP switch selectable):
Level gain (DIP switch selectable):
Level meter scale:
Dynamic range:
Midscale resolution:
Bargraph Length:
LED segment pitch:
LED bargraph display
20
VU or PPM
-6, 0, +4, +8 dBu
+4 (peak) to -40 dB
44 dB
1 dB
2" (50.8 mm)
0.1" (2.54 mm)
Installation Note:
The two level meter
Input Level Gain Calibration
and
VU/PPM Display Mode
DIP switch modules are
accessible through openings in the top cover of the unit. Any adjusments to the DIP switch modules should be performed
before
installing the unit into an enclosed rack.
LED Bargraph Level Meter Specifications
-6
dBu
AMP2A 20-Segment Bargraph Level Meter
DIP Switch Settings (719030 PCB)
3
1 2
4
3
1 2
4
Gain Calibration
1 2
3 4
1 2
3 4
0
dBu
+4
dBu
+8
dBu
PPM
4
2
1
3
VU
1
3
2
4
Display Mode
