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The WMA-01 and 01LF 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
–125V to +125V. The 24V DC power
supply requirement offers the possibility
for battery powered operation.
Safety
- This product is able to produce over
125V, but the 50kΩ output impedance
limits the current to a rather safe maximum
of 2.5mA. This voltage is 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-01/01LF should be double insulated
(class II) or a SELV type (SELV = Safety
Extra Low Voltage, typically a battery).
- The WMA-01/01LF 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-01/01LF 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-01/01LF from the DC power before
cleaning.
Input protection
A low-noise amplifier like the WMA-01 or
WMA-01LF 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 -6.25V to +6.25V
range, resulting with an amplification of
20x in an output voltage swing of more
than -125V to +125V.
Ouput protection
The WMA-01/01LF 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).
