Summary of Contents for Terahertz Technologies PDA-750
- Page 1 PDA-750 Photodiode Amplifier Operating Instructions Terahertz Technologies Inc. 169 Clear Road Oriskany NY 13424 TEL: (315) 736-3642 FAX: (315) 736-4078 www.terahertztechnologies.com Copyright 2003-2006...
-
Page 2: Table Of Contents
Table of Contents Topic Page GENERAL INFORMATION Introduction..........................1 Unpacking and Inspection......................1 Power Requirements........................ 2 Specifications........................... 2 OPERATING INSTRUCTIONS Operation..........................3 Display and Controls....................... 4 Operating Considerations......................6 Rs-232 Operation ........................7 WARRANTY INFORMATION Repair Information........................8 Limited Warranty........................8... -
Page 3: Introduction
Introduction The PDA-750 is a low noise, high gain transimpedance amplifier that is designed to provide a direct digital readout of the current generated from a photodiode, photomultiplier, or other similar current source. With full scale input ranges of 20 nA to 20 mA and a noise level of less than 1 pA, the PDA- 750 offers superb dynamic range. -
Page 4: Power Requirements
Power Requirements The PDA-750 is powered by a set of four AA size Nickel-Metal-Hydride rechargeable cells. It may also be operated by its wall mount charging supply when access to line power exists. The unit may also be powered from alkaline AA cells in cases where the batteries have run down and no line power is available. -
Page 5: Operation
Operation The PDA-750 is equipped with an electrically isolated BNC input connector. Current injected into the center contact (with respect to the outer contact) provides a positive indication on the display. The equivalent electrical circuit of the unit as is illustrated below. -
Page 6: Display And Controls
PDA-750 Front Panel Controls... - Page 7 Operation The operation for measuring photodiode current is as follows: 1. Disengage both the Bias and Amps/Watt Engage push buttons. 2. Select the range that includes the highest expected current to be measured. If this is unknown, select the least sensitive range. 3.
-
Page 8: Operating Considerations
Typical shunt resistances of small germa- nium detectors are in the range of 100 K. The maximum input offset voltage of the PDA-750 is 100 μV. The input offset current will then be: 100 μV/100 K = 1.0 nA. This current may be nulled out with the offset control. -
Page 9: Rs-232 Operation
(known as detector dark current) when impressed across the detector shunt resistance. Rs-232 Operation The PDA-750 is equipped with a bi-directional “three-wire” Rs-232c interface. It permits the unit to be remotely controlled via an external computer and will report readings and the unit’s status on request. -
Page 10: Repair Information
Warranty And Repair Information REPAIR INFORMATION Products manufactured by Terahertz Technologies Inc. are designed and fabricated to provide reli- able performance. However, in the event that service is required, both telephone technical assis- tance and factory repair services are available. Call (315) 736-3642 for information. For IN-WAR- RANTY REPAIRS, call us to obtain a Returned Material Authorization number, (RMA Number).
Need help?
Do you have a question about the PDA-750 and is the answer not in the manual?
Questions and answers