Femto dlpca 200 amplifier

The STM-electronics are based on a digital design. A DSP digital signal processor controls the scanning parallel X, Y to the surface as well as the tip - sample separation. An additional high voltage amplifier and a current preamplifier complement the electronics. There is are options to read data from external devices, too. One input channel records the tunneling current, the others may be used to read other signals e.

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• What Kind of Application Do You Have?
• List of items necessary for commissioning
• Dlpca 200 manual
• > Enviroscope - Scanning Probe Microscope (AFM)
• Conductive Atomic Force Microscopy
• Variable Gain Low Noise Current Amplifier DLPCA-200
• Electro Optical Components, Inc. Datasheet DLPCA
• Showing Results for FEMTO DLPCA-200
• FEMTO – Current Amplifier

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What Kind of Application Do You Have?

Welcome, Guest. Please login or register. Did you miss your activation email? This topic This board Entire forum Google Bing. Print Search. Pages: [ 1 ] Go Down. Read times. Hi, I repaired a Keithley Electrometer and I would like to calibrate the meter. I have build some high ohm resistors 1G, 10G, G and 1T. That worked, but maybe there is some room for improvements. In all the manuals of the Keithley Electrometers I know the and only they use a Guildline Teraohmmeter to measure the G resistor.

Unfortunately, I couldn't find a manual for the Guildline meter. I wonder how that is calibrated. Maybe I can mimic the Teraohmmeter to achieve better uncertainties. Does anyone have the service manual of the Guildline Teraohmmeter? Or other ideas to calibrate high ohm resistors? The problem with the high ohm resistors is their very high voltage coefficient. It really matters which voltage was applied for comparison. Best regards Philipp. Hello Philipp I think with your way of calibrating the , you have probably reached the limit of accuracy.

The way I have done the high ohm calibration of my in the past is to measure a GOhm resistor with the Keithley B at different voltages and then rely on this value for the calibration. In the past I have also looked at manuals for Guildline Teraohmmeter and even asked Keithley.

But no success. There are 3 kinds of people in this world, those who can count and those who can not. Hello Philipp, I had intended to do such work as well, being currently limlted to M, but just have not had time to work on this. The idea was to charaterize the current input of the A in its nA range, which typically is pretty precise, but needs verification first.

Can be done with low voltage and e. Internal shunt must be taken into account. The use the calibrated nA range to measure higher resistances at high voltages from a calibrator. I was thinking of either building the Standards myself or buying Russian-type Standards. Any experience with those stability, tempco Metrology and test gear and other stuff: www. Zlymex built himself a high impedance bridge. Perhaps that could be replicated.

You'd still need access to calibrated high impedance resistors though. I used both instruments as a transimpedance amplifier only. Which means I connected the analog output of the to my A. The voltage was fed by my Fluke B. That results in the same output on the K output. With that data I fitted a linear function and the ratio of the slopes should be the ratio of the resistors.

This way I get rid of the offsets. A remaining source of errors is the changing burden voltage of the input. I used the as a high impedance voltage follower to measure the input voltage of the DLPCA with different input currents. That revealed one should'nt use the amplifier with more than 7V of output to keep the burden voltage roughly constant. To test that with the I used my A to measure the input voltage I haven't a second high impedance meter.

The is much more stable over different input currents. To be stable is much more important than the absolute value of the burden voltage, because the constant part is eleminated by the linear fit. I used the ratio of the slopes and the calibration value of my Fluke A to calculate the value of the 1Gig resistor.

This value matches the calibration value of the 1Gig resistor by less than 2ppm. But that is of course just coincidence. I have to repeat that measurement several time to get a feeling of the repeatability. They are wirewound hermetically sealed devices. So You can expect virtually no voltage coefficient and low tempco. They utilize 'microwire' technology: ultra thin 1um wire in glass insulation. Models 1Meg - Meg are made as typical two terminal resistor in shielded case. Model P is universal 1GG and it is made as a resistor divider if I understand correctly.

Their prices are still relatively high because the there are not so many competitors in making microwires. I only have experience with 1Meg, 10Meg, Meg rated 1kV models and their resistance is very stable. I have to warn You that they are fragile during transport, so ask the seller to protect well the device before shipping. Quote from: ap on July 08, , pm. Hi Philipp, thanks, interesting info Not yet having a calibrated 1G, I used a 10M and a 1V source in a quick and dirty test, so not apples to apples.

Kleinstein Super Contributor Posts: Country:. The uses the shunt method down to the very low currents. For the nA range, there is a shunt in the 5 MOhms range, that is intrinsically noisy. The uses a transimpedance amplifier and can this way get away with less noise from the resistor as the voltage at the resistor is much higher.

The nA are more like an easy range for the , while it is the low end for the For the very low currents one can also use the rate of voltage change in a capacitor instead of a large resistor.

It is much easier to get a good 10 pF cap than a 1 T ohms resistors. Attached is an Article about low current traceability. Guildline is very good about manuals, send them an email. Current models have manuals, there is a cal routine in them I think would be a rate of x1 1V 6 Step Wayyyyyy back and let reading settle. Select -TV button 9 Step Wayyyyy back and let reading settle. The following users thanked this post: alm. Pages: [ 1 ] Go Up. There was an error while thanking.

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List of items necessary for commissioning

Welcome, Guest. Please login or register. Did you miss your activation email? This topic This board Entire forum Google Bing. Print Search. Pages: [ 1 ] Go Down. Read times.

Dlpca 200 manual

You know the routine. You have rigged up a prototype for your application. Your detector is doing what it does. Now all you need is a current amplifier so you can see and measure what is happening. The problem is, which amplifier to go for? How much bandwidth do you need? How much gain do you need?

> Enviroscope - Scanning Probe Microscope (AFM)

All this in a rugged, compact EMI-shielded case, designed with the user in mind and built to guarantee trouble-free operation even in very rough and noisy environments. Bandwidth and Frequency Response Independent of Source Capacitance Unlike similar amplifiers available the DLPCA requires no particular adaptation, such as frequency compensation for different sources. In addition, it provides maximum speed even in high gain settings. For those applications not requiring the full bandwidth, the unit has a switchable 10 Hz lowpass filter to eliminate wideband noise and thus allowing accurate and ultra low-noise DC current measurements down to femtoAmperes.

Conductive Atomic Force Microscopy

The wide variety of amplifiers are created for different types of solution to ensure high performance is achieved in every experiment. Custom-designed modules are also available to provide the most holistic solution to your needs. Please contact us for more details. The DDPCA is the low noise transimpedance amplifier that covers an extensive dynamic range of more than dB for the measurement of currents from sub Femto amps up to milliamps by merely switching the gain range. The ultra low noise performance is achieved by selecting at very high gains , all while maintaining the associated bandwidth reduction.

Variable Gain Low Noise Current Amplifier DLPCA-200

On the CreaTec High Voltage Amplifier, the three piezo voltages x, y, z are amplified by a selectable factor of 1, 3, 10 or 30 to the dual voltage bipolar output. An offset voltage or a modulation voltage may be added to any channel by a potentiometer and via separate inputs. An interface to the DSP board allows reading the gain settings into the STM program to set the appropriate scaling in the images. Home - Products - Automation and Software. Downloads Not yet available. Specifications On the CreaTec High Voltage Amplifier, the three piezo voltages x, y, z are amplified by a selectable factor of 1, 3, 10 or 30 to the dual voltage bipolar output.

Electro Optical Components, Inc. Datasheet DLPCA

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FEMTO – Current Amplifier

Packed with features the DLPCA variable gain transimpedance amplifier is designed for a wide range of applications that require the conversion of small currents into usable voltages. An adjustable bias voltage connected to the shield of the input socket is provided to optimize the speed and noise performance of external photodiodes connected to the amplifier input. All functions can be set either manually by switches or through the opto-isolated interface by remote control. All this in a rugged and compact EMI shielded case designed with the user in mind and built to guarantee trouble-free operation even in very rough and noisy environments. Unlike other amplifiers available the DLPCA requires no particular adaptation such as frequency compensation for different sources.

Both scanners can be operated in feedback control. Such a scanning arrangement avoids many of the issues of conventional tube-scanners such as background curvature and non-linearity. A hood protects the SPM against electromagnetic radiation, air movement, and abrupt temperature changes.