Photodiode Measurement
Low-noise current measurement for photodiodes and optical detectors.
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femto
DLPCA-200
Current / Transimpedance Amplifier
Transimpedance (gain) switchable from 1 x 103 to 1 x 1011 V/A
PRODUCT OVERVIEW
Product Information
OFFICIAL DOCUMENTS
DLPCA-200 Technical Documents
Official technical documents provided by femto.
✓ Official manufacturer document verified
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TECHNICAL SPECIFICATIONS
Specifications
APPLICATIONS
Typical Applications
Common measurement applications where this product can be effectively used.
APD Measurement
Sensitive current detection for avalanche photodiode measurement systems.
Spectroscopy
Precision optical signal acquisition for spectroscopy experiments.
PRODUCT COMPARISON
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PRACTICAL ENGINEERING GUIDANCE
Engineering Notes
Practical setup guidance, measurement cautions and application notes for this product.
GainhighOfficially VerifiedManufacturer Source
1. Start with a lower gain
Begin measurement with a lower transimpedance gain and increase it gradually while checking the amplifier output for saturation, offset and unexpected signal peaks.
Source: manufacturer
BandwidthhighOfficially VerifiedManufacturer Source
2. Check gain-dependent bandwidth
Available bandwidth generally changes with the selected transimpedance gain. Confirm that the chosen gain setting satisfies the required signal bandwidth before finalizing the measurement configuration.
Source: manufacturer
Input ConnectionhighOfficially VerifiedManufacturer Source
3. Keep the detector cable short
A longer detector cable adds capacitance and can affect noise, stability and response speed. Keep the high-impedance input connection as short as practical.
Source: manufacturer
GroundinghighOfficially VerifiedManufacturer Source
4. Avoid unnecessary ground loops
Multiple ground connections can create circulating currents and increase interference. Review the complete detector, amplifier, oscilloscope and power-supply grounding arrangement.
Source: manufacturer
CleanlinessnormalOfficially VerifiedManufacturer Source
5. Keep connectors clean and dry
Contamination and moisture around high-impedance input connectors can create leakage current. Keep connectors and adapters clean, dry and free from conductive residue.
Source: manufacturer
Source CapacitancehighOfficially VerifiedManufacturer Source
6. Consider detector and cable capacitance
FEMTO states that the DLPCA-200 maintains a flat response for source capacitances up to approximately 1 nF without requiring external frequency compensation. Nevertheless, detector and cable capacitance should still be considered when evaluating noise and the complete measurement system.
Source: manufacturer
Remote ControlnormalOfficially VerifiedManufacturer Source
7. Use opto-isolated remote control for automated setups
Gain selection and several operating functions can be controlled through opto-isolated digital inputs. This is useful for automated measurements because it reduces direct electrical coupling between the control system and the sensitive amplifier.
Source: manufacturer
OverloadhighOfficially VerifiedManufacturer Source
8. Watch the overload indicator during setup
The DLPCA-200 includes an overload indication. Begin measurements at a lower gain, observe the output and overload status, and then increase gain only when sufficient output headroom remains.
Source: manufacturer
TECHNICAL RESOURCES
Downloads
LABTECH KOREA
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