PICO-AMP Miniature Remote Sensing System
PICO-AMP MD14 Amplifier Description
Amplifier Features
Operating indicators and selectors are located under the transparent, hinged cover for
convenient adjustment.
Light or Dark Operate Selection
Choose light or dark operate (the output energizes when the light condition is sensed
if set to light operate; it energizes when the dark condition is sensed if set to dark
operate).
Sensitivity Adjustment
Amplifier gain is increased with clockwise rotation of the 12-turn Sensitivity
Adjustment, using the small, flat-blade screwdriver included with the MD14 (or
equivalent). The Sensitivity Adjustment is clutched at both ends of travel to prevent
damage.
LED Indicators
The green LED lights whenever power is applied to the MD14. It will flash if either
output becomes overloaded.
The yellow LED lights when the MD14 senses its own modulated light. It will flash if
the received light signal strength becomes marginal (excess gain between 1.0 and
1.5x). It lights steadily for received light signal strengths greater than 1.5x excess
gain.
Output OFF-delay
A two-position switch selects either no output delay or a 50-millisecond pulse
stretcher (OFF-delay). The OFF-delay is beneficial in applications where a very short
sensing event might be missed due to slow response of the load or input connected
to one or both sensor outputs.
Frequency Selection
A four-position switch selects one of three modulation frequencies, or Auto Frequency
mode. The multiple frequencies allow up to three PICO-AMP sensors to be placed
together, in close proximity, without mutual interference (without optical “crosstalk”).
Auto Frequency mode is recommended for all applications (even when crosstalk
potential is not an issue), except in certain mutual interference situations where the
strength of either the intended or interfering light signal is near the switching
threshold. In these cases, the best sensing performance is achieved by manually
setting interfering sensors to alternate modulation frequencies.
NOTE:
1)
The strength of an interfering light signal may be substantial, but should not
exceed the strength of the intended light signal.
2)
The MD14 is not designed to ignore the light from other modulated sensor
families.
3)
Manual frequency selections increase sensing hysteresis.
4)
Auto Frequency mode defaults to Freq 1 at power-up.
Output OFF-delay
Switch
Light or Dark Operate
Switch
Power Indicator
12-turn Sensitivity
Adjustment
Light Sensed Indicator
Sensor Connections
(see page 7)
Frequency Select Switch
Figure 1. MD14 amplifier features (shown
with cover removed)
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