Single Channel High Voltage Linear Amplifier A400
Operating Ambient Temperature |
0°C to 30°C |
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Storage Temperature |
0°C to 60°C |
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Relative Humidity |
up to 90% (operation), 30% to 50% (storage) |
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Power Requirements |
100V or 110 V or 220 V, 50/60 Hz or 110/220V selector switch |
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Fuse |
100/110 V: 3.15 A (slow), 220/230 V: 2 A (slow) |
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Dimensions (H/W/L) |
102 x 257 x 262 (mm) |
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Weight |
4 kg |
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Country of Origin |
Sweden |
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GENERAL DESCRIPTION |
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The A400 is a general purpose broadband linear amplifier having a fixed amplification of 20 times and capable of bipolar high voltage output of ±200. Any functiongenerator or arbitrary waveform generatoror any othe signal source with amplitude up to ±10 V can be used as an input device. The amplifier's output is linear from DC up to megahertz range. It can be used in a wide range of applications, for example to drive piezo actuators, MEMS, OLEDs, liquid crystals, etc.
INPUT AMPLITUDE |
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The input amplitude should normally be kept within ±7.5 V. This is most important since the input protection network will limit the signal amplitude and cause clipping. The input protection network effectively cuts accidental spikes and overshoots. It is equipped with a microfuse rated at 15 mA, which will be blown if the input voltage exceeds 300% of the maximum. Spare fuse is provided inside the instrument case.
LOAD |
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The amplifier is intended to drive resistive and/or small capacitive loads. The maximum capacitive load depends on the slew rate of the amplifier. This is normally set at the factory to 300 V/µs which yields the load limit of 450 pF. This limit includes the capacitance of the connection cable (ca 100 pF/m for a standard coaxial cable). Increasing the capacitive load results in lower speed since the slew rate becomes governed by the output current limit. Reasonable overloading does not harm the amplifier but may cause an overshoot to appear. This in turn can be compensated by adjusting the speed of the amplifier to the load. Such an adjustment can be made free of charge prior to delivery. It may also be performed later by qualified personnel and the factory should be contacted for advice. Inside the cabinet exist hazardous voltage levels and the amplifier circuit is sensitive to static discharge.
The amplifier output is equipped with fast-recovery diodes for protection against high energy flyback and can be used to drive small (mH) inductances in series with resistance.
The amplifier cannot be used to drive a purely inductive load.
The continuous output current limit is 185 mA and the output power limit is ca 30 W. The output is equipped with a current limiting circuit that withstands accidental short-circuits. Prolonged short-circuiting may result in overheating the amplifier.
The amplifier may be overheated when the output is short-circuited for a long time.
FLC Electronics AB recommends to monitor the output signal of the amplifier with an oscilloscope. It is then important to use a low capacitive probe with a division factor of at least 1/10.
FREQUENCY RESPONSE |
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Full and small-signal frequency responses without load (red and orange marks) and with 400 pF capacitive load (blue and green marks), respectively, are shown in the diagram below:
TROUBLESHOOTING |
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Problem |
Condition |
Solution |
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No output |
Power switch does not lit |
Check the mains fuse located on the back |
No output or very small, distorted signal |
Power switch OK |
Check the input microfuse located inside the device (see below). |
Constant high voltage output |
Without any input signal |
Amplifier failure. Contact support@flce.se |
You should suspect a blown input microfuse if the output is about zero or the amplifier is producing a very low voltage, distorted copy of the input signal (due to the capacitive coupling through the blown fuse).
Spare microfuses are provided inside the instrument. They look like small metal cans and are placed in white holders. The resistance of a good fuse is in the order of 46 ohm. It is imperative to disconnect the power cable and wait at least a minute before opening the case. If required, contact support@flce.se for advice.
