Unipolar Variable Gain High Speed Amplifier F70PV
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 F70PV is a very fast, unipolar, linear amplifier having a variable amplification of 0-10 times and capable of voltage output of +70V. Any functiongenerator or arbitrary waveform generatoror any othe signal source can be used as an input device. The amplifier's output is linear from DC up to ca 10 megahertz range. It can be used in a wide range of high speed applications.
INPUT AMPLITUDE |
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The amplifier has an attenuator at the input. At the knob position “10” the amplification is equal to 10x. Standard value is 500 ohm, but other values like 50 ohm, 1kohm, etc., can be fitted in on request.
The input amplitude should normally be kept within 0 and +7V when the amplification is set to "10". A typical output voltage range of a function generator will not harm the amplifier but the input protection network will limit the signal amplitude to +7 V (after attenuator) and may 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 capacitive loads. The maximum capacitive load depends on the slew rate of the amplifier. This is normally set at the factory to 500 V/µs which yields the load limit of 1 nF. This limit includes the capacitance of the connection cable (ca 100 pF/m for a standard coaxial cable). Increasing the capacitive load causes overshoot and may even cause instability of the amplifier. If a larger capacitive load is required then the slew rate should be reduced accordingly (see the manual).
The output current limit is set to ca 2 A. The output is equipped with a current limiting circuit that withstands accidental short-circuits and with a protective 1 Ω resistance. However, prolonged short-circuiting or overload should be avoided.
Total noise at the output with short-circuited input is:
| Frequency [kHz] | 0.5 | 1 | 10 | 50 |
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| Noise [V/√Hz] | <1.3 | <0.32 | <0.06 | <0.05 |
FREQUENCY RESPONSE
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The frequency response to 1 Vpp input amplitude and with 50 ohm load is shown in the following diagram:
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.
