USER GUIDE 3‐Channel DC Current Datalogger Model SD900
Table of Contents 1. INTRODUCTION 3 2. DESCRIPTIONS 4 3. OPERATION 5 4. 5. Power 5 Connecting Current Cables 5 Datalogging 5 Time/Date/Sample Rate Check 6 SD Card Data Structure 6 Transferring Data to a PC 6 Advanced Settings 7 System RESET 8 RS232 Interface 8 Backlight 8 MAINTENANCE 8 Battery Replacement 8 Cleaning and Storage 8 SPECIFICATIONS 9 2 SD900‐en‐GB_V1.
1. Introduction Thank you for selecting the Extech SD900 3-Channel Current Datalogger. The SD900 is a three channel 0 to 20mA DC current loop monitor and data logger. Data is stored at a selectable rate and stored for easy export to spreadsheet software. This device is shipped fully tested and calibrated and, with proper use, will provide years of reliable service. Please visit our website (www.extech.
2. Descriptions 1. Channel 1 Display 2. Channel 2 Display 3. Channel 3 Display 4. LOG and 5. SET button 6. ▲and (TIME) button 7. ▼ and ( Power) button 8. AC adaptor socket 9. Reset button (ENTER) button 10. RS‐232 output 11. SD memory card socket 12. Channel 1 input 13. Channel 2 input 14. Channel 3 input Note: Battery Compartment and Tilt Stand are located on the back of the meter. 4 SD900‐en‐GB_V1.
3. Operation Power 1. Install six (6) ‘AAA’ 1.5V batteries in the meter. The batteries provide backup power for the clock. 2. Connect the AC/DC power adaptor to the DC 9V input on the meter. The power adaptor is required for data logging. 3. icon appears in the display the batteries are weak and should be replaced. When the However, in‐spec. measurements may still be made for several hours, after the low battery indicator appears. Connecting Current Cables 1.
Displayed error messages: CHCArd The memory card is full or there is a problem with the card LobAt The battery is low and datalogging is disabled no CArd The SD card is not inserted 2. Press the LOG button for >2 seconds to begin logging. “DATALOGGER” will appear in the display and the meter will beep each time the data is recorded (if the beeper is enabled). 3. To stop datalogging, press the LOG button for >2 seconds.
Advanced Settings The SET function is used to: Format the SD memory card Set the date and time Set the sampling time Set the beeper sound ON/OFF Set the SD card Decimal character Set the RS232 data output ON/OFF 1. Press and Hold the SET button for >2 seconds to enter the setting mode. The first function (Sd F) will appear in the display. Press the SET button to step through the six functions. Use the ▲ and ▼ buttons to adjust the selected function.
System RESET If a condition appears where the CPU does not respond to keystrokes or the meter seems frozen, press the RESET button on the side of the datalogger (use a paper clip or similar pointed object) to return the meter to a working state. RS232 Interface For streaming of data to a PC via the RS232 Output jack, the optional 407001‐USB kit (RS232 to USB cable and driver CD) along with the 407001 software (available free at www.extech.com) are required.
5. Specifications (at 23 ±5°C) Display 60 mm x 50 mm (2.4 x 2.0”) LCD Memory Card SD memory card, 1 GB to 16 GB (4G or less recommended) Input Signal 0 to 20mA (3 channels) Resolution 0.01mA Accuracy ± (0.5 % + 0.02mA) Datalogger Sampling Time 1/2/5/10/30/60/120/300/600 seconds/auto Display update rate Approx. 1 second (with the sampling rate set to ‘1’ second some data points could be lost) Data error number ≤ 0.1% no.
