Falco Systems WMA-005 User Manual - page 3
II
environment
(domestic,
light
industrial).
- The power supply connected to the
WMA-005
should
be
double
insulated (class II) or a SELV type
(SELV = Safety Extra Low Voltage,
typically a battery).
- The WMA-005 is a class III product.
Do not connect the amplifier to the
mains safety earth. If this is done,
the system becomes a class I
apparatus with class III isolation,
which means that the protective
insulation may be inadequate. Doing
so (only under laboratory conditions)
is fully at the users’ risk. Risk of
electric shock!
- The WMA-005 should not be used
above 1500m altitude to prevent
electrical breakdown.
- This product should only be
cleaned with a soft, slightly moist
cloth. Unplug the WMA-005 from the
DC power before cleaning.
Input protection
A low-noise amplifier like the WMA-
005 can never be made fully
insensitive
to
input
overload
conditions, as this would limit the
performance of the amplifier to an
unacceptably
low
level.
The
maximum input voltage is 10V, and
the absolute maximum rating is 15V.
Warning: exceeding this spec may
cause permanent malfunction of the
amplifier and is not covered by the
warranty!
For normal operation, input voltages
should remain in the –3.75V to
+3.75V range, resulting with an
amplification of 20x in an output
voltage swing of more than –75V to
+75V.
Never apply more than +10V (-10V)
to the amplifier input!
Output protection
The WMA-005 has been designed to
be fully stable with all capacitive
loads. It has been optimized for its
step-response, but is also a very
good linear and sine-wave amplifier.
No significant overshoot occurs at
any capacitive load.
Overloading or short-circuiting this
amplifier will not break down the
amplifier, due to the 50k
Ω
current
limiting resistor that has been
employed at the output.
Although the amplifier cannot be
damaged by a short-circuit condition
or capacitive loading, two situations
should be avoided:
-
Connecting a charged capacitor
-
Using high inductance values
(coils)
The load
The output impedance of the WMA-
005 is 50k
Ω
. The amplifier is
generally used for high-impedance
applications where the load is mainly
capacitive. This is true for MEMS
devices, EO-modulators and PZT's
(piezo’s) alike. It should be noted
that a coaxial cable also presents a
capacitive load of approximately