Universal Transconductance Amplifier User Manual [PDF]

The UTA is a special purpose amplifier that converts the microamp-level current output of LI-COR1 light sensors to a cor

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Universal Transconductance Amplifier Universal Voltage Output Amplifier for LI-COR™ Sensors (Amplifies LI-COR sensor current to voltage-logger level)

Revision D

User Manual

Contents: Introduction ................................................................... 2 Configuring your UTA .................................................. 3 Connections ................................................................... 4 Calculations ................................................................... 5 Troubleshooting............................................................. 6 UTA Recalibration......................................................... 6 Physical Dimensions ..................................................... 8 UTA Circuit Schematic ................................................. 9

rev. D ©2004 EME Systems, 2229 Fifth St., Berkeley CA 94710; (510) 848-5725; fax: (510) 848-5748; www.emesys.com

Universal Voltage Output Amplifier for LI-COR™ Sensors (Amplifies LI-COR sensor current to voltage-logger level)

Revision D

The UTA is a special purpose amplifier that converts the microamp-level current output of LI-COR1 light sensors to a corresponding signal voltage. The UTA can be configured at EME Systems or by the end user for any one of the three standard LI-COR sensors, and for any one of four popular output voltage ranges, through the manipulation of two plug-in jumpers. The UTA provides a simple interface between LI-COR sensors and voltage input data loggers, chart recorders, HVAC, and greenhouse control systems. LI-COR sensor LI-190 PAR sensor LI-200 Pyranometer LI-210 Photometer

Typical full sun response 12-15µA @ 2000 µE/m2s 100µA @ 1000 W/m2 40µA @ 100 klux (=9290 ftcd)

UTA output ( user selectable )2 1, 2, 5, 10 Volts out @ 16.67µA input 1, 2, 5, 10 Volts out @ 125µA input 1, 2, 5, 10 Volts out @ 50µA input

Alternate gain settings are available on special order. In particular, a special UTA/HOBO is available for use with ONSET HOBO3 data loggers. Also, higher gains are available for use of the sensors at low light levels, indoors or underwater. The calibration tag provided by LI-COR with each sensor, in conjunction with the preset amplifier gain factor can be used to compute the light levels incident on the sensor with a high degree of accuracy. Specifications: • Supply Voltage: 5–24 VDC (supply volts > full scale output volts + 2) • Supply Current: less than 1mA • Gain accuracy:± 0.5% all ranges ± 0.2% on factory preset range •Voltage output in darkness:

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