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The WMA-005 and 005LF amplifiers
contain an over-voltage protection for daily
use in the laboratory and are long-term
short-circuit proof. The input (indicated
“Input” on the label), output (indicated
“Output”) and DC power supply (Indicated
“24V DC 180mA”) connections are all
standard BNC.
The amplification is 20x (fixed). The
amplifiers have an output voltage range of
–75V to +75V. The 24V DC power supply
requirement offers the possibility for
battery powered operation. With an output
noise below 3mVrms, this amplifier will
enable many measurements in different
applications.
Safety
- This product is able to produce over 75V,
but the 50kΩ output impedance limits the
current to a rather safe maximum of
2.5mA. This voltage can be painful, but will
not be lethal (under normal circum-
stances). Nevertheless take care. This is a
high voltage unit and safety measures
should be taken accordingly.
- The internal circuitry of the amplifier
operates at high voltage. Only qualified
personnel from Falco Systems should
service it.
- When the amplifier is turned on or off, a
short voltage spike may appear at the
output which may damage circuitry already
connected to it.
- Replace the fuse with 250V 315mAT
5x20mm rated fuses only.
- This product is only suitable for indoor
use in a class II environment (domestic,
light industrial).
- The power supply connected to the
WMA-005/005LF
should
be
double
insulated (class II) or a SELV type (SELV
= Safety Extra Low Voltage, typically a
battery).
- The WMA-005/005LF 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-005/005LF should not be used
above 2000m altitude to prevent electrical
breakdown.
- This product should only be cleaned with
a soft, slightly moist cloth. Unplug the
WMA-005/005LF from the DC power
before cleaning.
Input protection
A low-noise amplifier like the WMA-005 or
WMA-005LF 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
absolute maximum input voltage 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.
Ouput protection
The WMA-005/005LF 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 50kΩ 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).
