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© 2006 Wohler Technologies Inc. ALL rights reserved
AMP1A-4S/-10S/-LP4S/-LP10S
User Manual P/N
821527
Rev-
B
Level Meter DIP Switch Settings
Two DIP switch modules, accessed through an opening in the top cover, allow the user to set the Bargraph Display Mode and Meter
Input Gain Calibration independently for each of the two bargraph displays. There are four sections (S1, S2, S3, S4) on each DIP switch
module. The first two sections (S1, S2) are for setting the Meter Input Gain Calibration and the second two sections (S3, S4) are for
setting the Bargraph Display Mode.
Meter Input Gain Calibration Settings
DIP switch sections S1 and S2 set the Meter Input Gain Calibration, which determines the level of the input signal that will result in
a "0" reading on the meter bargraphs. The factory setting is +4 dBv, but can instead be set for -6 dBv, 0 dBv, or +8 dBv by the user. See
the diagram below for settings.
Bargraph Display Modes
DIP switch sections S3 and S4 determine how peak levels are displayed (Display Mode) and select either the "PPM" mode or an auto-
reset "VU Peak" mode (NOT the PPM value!). The PPM mode exhibits an attack time of 10 milliseconds and a decay time of 2
seconds from 0 to -20 dB. The VU mode exhibits a 300 millisecond rise to 99% of full indication and a decay of 300 milliseconds.
The factory setting is VU mode. See the diagram below for settings.
Installation Note:
The Meter Input Gain Calibration/Bargraph Display Mode DIP 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.
Level Meter Gain Calibration and Display Mode Settings
AMP1A Analog 10-Segment
Level Meter DIP Switch Settings
Gain Calibration
2
1
-6 dBv
0 dBv
2
1
+4 dBv
2
1
+8 dBv
2
1
Display Mode
4
PPM
3
4
3
VU Peak
Section 3: Technical Information
