3
Cautions
The UFI Model 1010 Pulse Transducer is a rugged
instrument. However, it may be damaged unless
the following cautions are observed:
•
Do not expose Model 1010 to temperatures
above 50
o
C (122
o
F).
•
Do not use an ohmmeter to measure
resistance of Model 1010.
•
Do not apply DC voltages to Model 1010.
These can impose large stresses that can
bend diaphragm or fracture piezo element.
•
Model 1010 can produce output pulses of
several volts during handling and placement.
If connected equipment cannot handle such
inputs, Model 1010 should be disconnected
from downstream equipment until it has been
attached to subject.
Connection considerations
•
Model 1010 requires that downstream signal
conditioners have an input impedance of at
least l00 K
Ω
and a frequency response
extending below 1 Hz. A charge amplifier
connected between Model 1010 and signal
conditioner will extend low response.
4
•
Signals of just 4-5 mV saturate some
amplifiers. If Model 1010 does this, a simple
resistive voltage divider (see below) should
be inserted between the transducer and
instrument input. Circuit should be shielded
to prevent pickup of power line noise.
Model 1010
1M
SHIELD
Output to signal conditioner
100K to div ide input by 10
BLACK LEAD
10K to div ide input by 100
.
Applications for the Model 1010
To use as a pulse transducer:
•
attach Model 1010 to tip of any finger with
VELCRO® strap;
•
lightly rest finger on transducer surface with
edge of finger slightly overlapping edge of
transducer as shown in drawing below;
•
wrap VELCRO® strap around finger. Model
1010 should fit snugly but not restrict
circulation. If finger tip turns white or feels
cold, then unit is too tight.
