DSP-50 User Manual
Page 10 of 27
DSP50_MAN_A
by Output B will always be 250 milliseconds long. If the 2-second delay feature is active, Output A and Output B
will not pulse until a vehicle has been continually detected for the 2-second delay time.
In Pulse on Entry mode, Output B will pulse when the Output A activates. If the delay feature is enabled, the
pulse will not occur until the delay has timed out and the loop is still occupied. The output will not pulse again
until the loop has been unoccupied and any enabled extension has timed out. After the pulse has been
outputted, the Detect B LED will flicker (a very fast flash that is not at full brightness). This is a visual indication
that the pulse has already been output but the loop is still occupied and no further pulses can be output until
the loop is no longer occupied.
In Pulse on Exit mode, Output B will pulse when Output A deactivates. If one of the extension features is
enabled, the pulse will not occur until the extension has timed out and the loop is still vacant. The output will
not pulse again until the loop has been reoccupied and any enabled delay has timed out. Before the pulse has
been output, the Detect B LED will flicker (a very fast flash that is not at full brightness). This is a visual
indication that a vehicle is being detected and the pulse will be output when the vehicle exits or is eventually
tuned out.
NOTE:
In the magnetometer mode of operation the detector will only hold a detection for 2 seconds. Therefore,
if a vehicle stays over the sensor for more than 2 seconds it may generate additional pulses for the same vehicle.
Sensitivity (Rotary Switch)
The detector has ten (10) sensitivity levels. In most situations the sensitivity setting five (5) will work effectively.
For those situations where this setting is not sensitive enough, raise the sensitivity one level at a time until the
desired performance is obtained. For those situations where the detector is overly sensitive, lower the
sensitivity one level at a time until the desired performance is obtained. The factory default is five (5).
Like most inductive loop vehicle detectors, the DSP-50 directly measures the change in frequency of the loop
and from there, calculates the change in inductance when a vehicle interacts with it. The change in inductance
is measured as %ΔL/L (reads as “percent delta L over L”).
For the ten sensitivities, the thresholds are:
Setting
Sensitivity
Setting
Sensitivity
0
.48% ΔL/L
5
.08% ΔL/L
1
.32% ΔL/L
6
.06% ΔL/L
2
.24% ΔL/L
7
.04% ΔL/L
3
.16% ΔL/L
8
.03% ΔL/L
4
.12% ΔL/L
9
.02% ΔL/L
Factory Default
