Falco Systems WMA-200 User Manual

Manual is about: 50/20mV Low noise HV Amplifier

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USER MANUAL

● Ultra-low output noise: ~50µV

rms

with DC – 100kHz large signal

bandwidth; ~20µV

rms

with DC – 500Hz using the supplied load capacitor

box

● High voltage: 20.0x precision amplification up to +175V and -175V

output voltage with respect to ground

● Short-circuit protected output with 275mA output current capability

● No overshoot with capacitive loads: bandwidth changes automatically

to ensure stability

● 2 inputs: a standard BNC connector, and a differential connector to

reject interference (mating connector supplied)

● BNC monitor out connector provides 1:100 replica of the output signal

About this manual

This user manual is an integral part of the

Falco Systems WMA-200 high voltage

amplifier product. Please read it carefully

and pay attention to the recommendations

and instructions for safe use.

The WMA-200 high voltage

amplifier: getting started

The Falco Systems WMA-200 model is a

high quality, high voltage, linear laboratory

amplifier

optimized

for

experiments

requiring world-class, ultra-low output

noise. The excellent noise performance,

combined with the wide bandwidth and

large voltage range make this amplifier the

preferred choice for the most demanding

precision

positioning

systems.

The

amplifier will routinely enable sub-atomic

positioning

resolution

with

piezo

positioning systems and MEMS

devices,

and is the ultimate ultra low noise driver

for

EO-modulators,

(particle)

beam

steering, ultrasonics, dielectric studies,

and many other loads requiring a high

voltage drive.

The output noise level of the high voltage

amplifier is only ~50µV

rms

with its standard

large signal bandwidth of DC – 100kHz.

For even lower noise in experiments

where this large bandwidth is not required,

a capacitor load box is supplied with the

amplifier. It cuts the bandwidth to DC –

500Hz, at the same time reducing the

output noise level to an unprecedented

~20µV

rms

. Keep input and output cables as

short as possible to prevent picking up

interference from the surroundings. For

Falco Systems WMA-200

50/20µV Low noise HV Amplifier

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Summary of WMA-200

Page 1
User manual ● ultra-low output noise: ~50µv rms with dc – 100khz large signal bandwidth; ~20µv rms with dc – 500hz using the supplied load capacitor box ● high voltage: 20.0x precision amplification up to +175v and -175v output voltage with respect to ground ● short-circuit protected output with 275...
Page 2
More information on how to connect the amplifier for the lowest possible noise level, please read the ‘noise’ section later in this manual. The wma-200 high voltage amplifier is designed to be fully stable and free of spurious signals with any capacitive load. The amplification is a precise 20.0x (f...
Page 3
The 1kΩ resistors also add to the output offset voltage because the offset current of the input amplifier generates a voltage over these resistors. This output offset voltage is ~3mv if the bnc input is used with a 50Ω signal generator. When both inputs are shorted together or connected to a low-imp...
Page 4
Cabling the wma-200 high voltage amplifier has been designed for use in the most demanding low noise experiments. As such, the noise generated by the amplifier is so low, that the actual performance of the set-up in which it is used can easily be dominated by interference picked up from the surround...
Page 5
Connector together wile leaving the ground pin in the middle open (fig. 2). The output noise will be lowered further when the bandwidth of the amplifier is reduced, which happens when a significant capacitive load is connected to the output. This will happen automatically when a high-capacitance pie...
Page 6
- rms output noise voltage versus capacitive load (fig. 7) - noise and offset without capacitor box (fig. 8) - noise and offset with capacitor box (fig. 9) - noise spectrum with and without capacitor box (fig. 10) - sine and triangle wave responses (fig. 11, 12) - square wave response (fig. 13, 14, ...
Page 7
Figure 7. Rms output noise voltage versus capacitive load figure 8. Noise without output loading, and with the the 1µf capacitor box connected, plus typical offset. The noise, as measured with a true rms voltmeter in a 1mhz bandwidth, is 48µv rms with no load, and 18µv rms with the 1µf load connecte...
Page 8
Figure 10. Triangle wave 300v pp 1khz figure 11. Square wave 300v pp 1khz figure 12. Square wave 300v pp 20khz time (ms) ou tp ut vo lta ge (v) -150 -100 -50 0 50 100 150 2.0 1.5 1.0 0.5 0.0 time (ms) ou tp ut vo lta ge (v) -150 -100 -50 0 50 100 150 2.0 1.5 1.0 0.5 0.0 time (µs) ou tp u t vo lta ge...
Page 9
Figure 13. Square wave 1v pp 20khz (small signal response) figure 14a. 300v pp step response 10-90%: up in 4.4µs figure 14b. 300v pp step response 10-90%: down in 4.2µs time (µs) ou tp ut vo lta ge (v) -0.4 -0.2 0.0 0.2 0.4 100 80 60 40 20 0 time (µs) ou tp ut vo lta ge (v) -150 -100 -50 0 50 100 15...
Page 10
Figure 14c. 0 to 150v step response 10-90%: up in 3.5µs figure 14d. 150 - 0v step response 10-90%: down in 3.8µs figure 14. Unipolar and bipolar step response figure 15a. 0pf load time (µs) ou tp ut vo lta ge (v) 140 120 100 80 60 40 20 0 -10 -5 0 5 10 time (µs) ou tp ut vo lta ge (v) 140 120 100 80...
Page 11
Figure 15b. 100pf load figure 15c. 1nf load figure 15d. 10nf load time (µs) ou tp ut vo lta ge (v) -150 -100 -50 0 50 100 150 100 80 60 40 20 0 time (µs) ou tp ut vo lta ge (v) -150 -100 -50 0 50 100 150 100 80 60 40 20 0 time (µs) ou tp ut vo lta ge (v) -150 -100 -50 0 50 100 150 100 80 60 40 20 0
Page 12
Figure 15e. 100nf load figure 15f. 1µf load figure 15g. 10µf load figure 15. 300v pp square wave response under different capacitive loading conditions. The 275ma current limit limits the speed at which the capacitor can be charged. The bandwidth adjustments of the amplifier with different capacitiv...
Page 13
Technical specifications amplification: precision 20.0x, fixed bandwidth: dc – 100khz @ -3db large signal bandwidth noise and offset: 50µv rms output noise typical without capacitor box, 20µv rms with capacitor box connected to the output, 700µv offset typical output voltage: -175v to +175v current:...
Page 14
User manual version user manual version: 1.3 date: december 9, 2016 falco systems falco systems remisestraat 1 2225 th katwijk aan zee the netherlands tel. +31 (0)6 21840996 fax. +31 (0)20 2031 445 email: info@falco-systems.Com http://www.Falco-systems.Com.