DUAL CHANNEL LINEAR AMPLIFIER WITH PHASE INVERTER
Model A800DI
HIGH VOLTAGE
1600Vpp 60mAFIXED GAIN
100xBROADBAND
DC to ca 200 kHzLOW OUTPUT IMPEDANCE
<0.1 ΩHIGH SLEW RATE
300 V/µs
GENERAL DESCRIPTION
The A800DI is a general purpose linear amplifier designed for laboratory use. It is based on a fast high-voltage operational amplifier with a feedback network chosen to give a voltage amplification of 100 times. Any function or arbitrary waveform generator with low output impedance and output voltage up to ±10 V can be used as an input device. The instrument contains two identical amplifiers sharing a common power supply. The instrument also includes a low voltage phase inverter that facilitates driving the two high voltage outputs in counter-phase. The amplifier outputs high voltage signals at high frequency. It is, thus, imperative for the safe operation that the user understands the possibilities and limitations of the instrument. Isolated BNC output connector is used to comply with safety requirements.
INPUT AMPLITUDE
The amplitude of the input signal should normally be kept within ±4 V. The input protection network limits the signal amplitude delivered to the power amplifier to a safe value. It also effectively cuts accidental spikes and overshoots. However, large and prolonged overvoltage at the input may blow the microfuse in the input protection circuit.
PHASE INVERTER
The A800DI contains a phase inverter which shares the input with the first amplifier (see the drawing on the next page). The phase inverter is intended to allow a bridge connection of the amplifiers and the load to achieve double amplitude of the output signal. In such a case, the output of the phase inverter should be connected to the input of the second amplifier, an external signal supplied to the input of the first amplifier and the load connected between the outputs of both amplifiers as in the example below.
Observe, that both sides of the connected load are actively driven and must be isolated from the ground. The voltage over the load is in this case U1 - U2 = U1 - (-U1) = 2U1 since U2 = –U1.
It is, of course, possible to supply separate signals to the low voltage inputs of both amplifiers and still use the differential connection of the load, as in the drawing. The amplifiers can also be used as two independent units sharing the common ground reference.
PLEASE NOTE:
In the differential configuration - isolate the load from ground and use two separate oscilloscope probes to monitor the voltage over the load.
FREQUENCY RESPONSE
The graph below shows full-scale frequency response of A800 witout load and with 300 pF pure capacitive load, respectively:
SUMMARY OF TECHNICAL DATA
Bandwidth:
DC to about 200 kHz at 800 Vpp
Amplification:
100 times
Load: type
max
resistive || capacitive
capacitive load 300 pF
Impedance: input
output
1 MΩ || 30 pF, custom values possible
<0.1 Ω in the linear mode
Voltage: input
nominal ±4 V
Current: output
maximum 60 mA each channel
Slew Rate: output
ca 300 V/µs without load (different adjustments available on request)
Input protection fuse
15 mA (Littelfuse, part number 272.015) one spare fuse provided inside the instrument, additional fuses available from Littelfuse resellers or from FLC Electronics AB.
Operating Ambient Temperature:
0°C to 30°C
Storage Temperature:
0°C to 60°C
Relative Humidity:
up to 90% (operation)
30% to 50% (storage)
Power Requirements:
100, 120 or 230 V, 50/60 Hz factory set or 110/220V line voltage selector
Fuse:
2 A (slow)
Dimensions (H/W/L):
112 x 255 x 316 (mm)
Weight:
4 kg
Country of Origin:
Sweden
Note: Specifications apply to instruments operating at 23°C±5°C ambient temperature after 15 min. warm-up time. Due to ongoing product development, specifications are subject to change without notice.
商品属性 [频率] DC to about 200 kHz at 800 Vpp