© 2010 Wohler Technologies, Inc. All rights reserved.
23
AMP V Series User Guide
Internal Switch Settings
Peak Hold
The Peak Hold - Manual setting allows the bar graph display meters to
indefinitely maintain the peak hold value until you reset it, either by
pressing a reset button (a special option specified at time of order) or by
removing power and then reapplying power to the unit (unplug/
replug power cord). Contact Wohler Technologies for more
information about this feature.
PPM Characteristics
The PPM characteristics determine the integration time (rise time) and
return time (fall time) of the level meter. The integration time is the
time it takes for the lighted segments of the level meter, after
application of a 5 kHz tone at a certain reference level, to rise within a
specified number of dB of that level. Return time is the time it takes for
the lighted segments of the level meter to fall a certain number of dB
after removal of a 5 kHZ tone of a certain reference level. The PPM
characteristics available for selection using DIP switch Sections 7 and 8
of the 10-position Internal DIP Switch (
Figure 1–12 on page 20
) are
listed in
Table 1–3
below.
Phase Correlation Display
Since it is sometimes helpful to observe phase relationships between
two signals being monitored, you can enable the phase correlation
feature within the lower section of the existing bar graph pair in the
AMP2-VSDA. This feature is enabled by setting a switch on the internal
10-position DIP switch module located internally on the PCB. See
Figure 1–13 on page 21
for DIP module location, and
Figure 1–16
for
settings. The labels for this feature (see diagram below) can be specified
Table 1–3
PPM Ballistics and Integration/Return
Time Relationships
PPM Ballistics
Integration/Return Times
IEC268-10, Type 1
Integration (Rise) Time is 5 ms (-2 dB);
Return (Fall) Time is 1.7 seconds (20 dB)
IEC268-10, Type 2
Integration (Rise) Time is 10 ms (-2 dB);
Return (Fall) Time is 2.8 seconds (24 dB)
DIN 4506
Integration (Rise) Time is 5 ms (-2 dB);
Return (Fall) Time is 1.5 seconds (20 dB)
Single Sample
Integration (Rise) Time is a single sample;
Return (Fall) Time is 1.5 seconds (20 dB)
