Extech Instruments SD500 User manual

USER GUIDE
Datalogging Hygro-Thermometer
Model SD500

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Introduction
Congratulations on your purchase of the Extech SD500 Temperature/Humidity Datalogger. This meter
measures, displays, and stores temperature and relative humidity readings. Data is stored on a SD
card for transfer to a PC. This meter is shipped fully tested and calibrated and, with proper use, will
provide years of reliable service. Please visit the Extech Instruments website (www.extech.com) to
check for the latest version of this User Guide. Extech Instruments is an ISO-9001 certified company.
Features
LCD simultaneously displays Temperature and Relative Humidity
Datalogger date/time stamps and stores readings on an SD card in Excel® format for easy
transfer to a PC
RS-232 PC interface jack
Selectable data sampling rate: 5, 10, 30, 60, 120, 300, 600 seconds
Long battery life or AC adaptor

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Product Description
1. Humidity Display
2. Temperature Display
3. Side Compartment
4. LOG (ENTER) button
5. SET button
6. Sensors
7. ▲(TIME) button
8. ▼button
9. AC adaptor socket
10. Reset button
11. RS-232 output
12. SD memory card socket
Note: Battery Compartment and Tilt Stand are located on the back of the meter.
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Operation
Battery Warning, Installation and Replacement
1. When the low battery icon appears in the display the batteries are weak and should be
replaced. However, in-spec. measurements may still be made for several hours after low
battery indicator appears before the instrument becomes inaccurate.
2. To replace or install batteries, remove the Philips head screw that secures the rear battery
cover and lift off the cover.
3. Replace the six AAA batteries (use alkaline heavy duty type), observing polarity.
4. Replace and secure the cover.
Datalogging
1. Open the left side door and insert a formatted SD card
Note: The SD card should be at least 1GB in capacity
Note: Do not use memory cards formatted by other meters or cameras. Use the SD card
formatting procedure under the advanced features section of this manual to correctly
format the card
Note: The internal clock must be set to the correct time. See the advanced features section of
this manual to set the clock.
Note: The default data structure uses a decimal point “.” as the numeric decimal indicator. See
the advanced features section of this manual to change this to a comma “,”.
Note: If the SD memory card is not installed, “EMPTY” will appear in the display
Note: Displayed error messages:
The memory card is full or there is a problem with the card
The battery is low and datalogging is disabled
The SD card is not inserted
2. Press the LOGGER 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 LOGGER button for >2 seconds. “DATALOGGER” will change
to “DATA” and the meter will count down through the recorded data.
NOTE: To avoid corrupting data, do not remove the memory card without properly ending the
record function.
Time/Date/Sample Rate Check
Press and Hold the TIME button for >2 seconds and the display will cycle through the date, time and
sample rate information.
No
CArd
LobAt
CH-
CArd

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SD Card Data Structure
1. When the SD card if first inserted into the datalogger the folder HTC01 is created.
2. The first datalogging session will then create a file HTC01001.XLS. All data will be saved to
this file until the number of columns reaches 30,000.
3. After 30, 000 columns a new file, HTC01002.XLS is created. This is repeated every 30,000
columns until HTC01099.XLS. At this point a new folder, HTC02 is created and the process is
repeated. HTC10 is the final folder.
Transferring Data to a PC
1. Remove the memory card from the datalogger and plug it into the SD card slot on the PC.
2. Launch Excel® and open the data file on the memory card from within the spreadsheet
program. The file will appear similar to the figure below.

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Advanced Settings
The SET function is used to accomplish the following:
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
Select the Temperature units
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 seven functions. Use the
▲and ▼buttons to adjust the selected function. Use the “LOGGER” button to step through
fields within a function. In the SET mode, if no button is pressed within 5 seconds the logger
will revert to the standard mode.
2. Sd F – Format the SD card. Press the ▲button to select yES or no. For yES, press the Enter
button. When yES and Ent appear, press the Enter key again to format the card and erase all
existing data. The screen will display a flashing yEs and ESC while the memory is being
erased and formatted.
3. dAtE – Set the date and time. Press the ▲or ▼buttons to adjust the selected field. Press the
Enter button to store the value and to step through the various fields.
4. SP-t – Set the sample rate. Press the ▲button to select the desired sample rate and press
Enter to store the selection. The selections are: 5, 10, 30, 60, 120, 300, 600 seconds and
AUTO. In AUTO, the data will be stored every time there is a value change of >1% RH or
>1°C/F.
5. bEEP - Set the beeper ON or OFF. Press the ▲button to select ON or OFF and press Enter to
store the selection.
6. dEC - Set the SD card Decimal character. Press the ▲button to select USA (decimal) or Euro
(comma) and press Enter to store the selection.
7. t-CF - Set the Temp. unit to °F or °C and press Enter to store the selection.
8. rS232 - Set the RS232 data output ON/OFF. Press the ▲button to select ON or off and press
Enter to store the selection.
9. ESC – Exit the setting mode. Press the SET button to return to normal operation.
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
A serial output is provided to link the meter to a PC’s serial port. Call Technical Assistance for more
information on this interface.

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Specifications
Display 60 x 50 mm (2.4 x 2.0”) LCD
Measurement sensors Temperature: Internal sensor
Relative Humidity: Precision capacitance type
Memory Card SD memory card, 1 GB to 16 GB.
Datalogger Sampling Time 5/10/30/60/120/300/600 seconds or Auto.
Temperature Compensation Automatic
Display update rate Approx. 1 second
Data Output RS 232
Operating Temperature 0 to 50°C (32 to 122°F)
Operating Humidity Less than 90% RH
Power Supply Six (6) AAA (UM4) Alkaline or heavy duty 1.5 V batteries or
9V AC adaptor.
Battery life Dependent on sample rate, for new alkaline batteries and 60 second
sampling time, > one month is typical. Fast sample rates will
significantly reduce battery life.
Weight 282 g (0.62 lbs.)
Dimensions 132 x 80 x 32mm (5.2 x 3.1 x 1.3”)
Range Resolution Accuracy (of reading)
0.0 to 50.0 °C 0.1°C ± 0.8°C
Temperature
32.0 to 122.0°F 0.1°F ± 1.5°F
70 to 90% 0.1% ± (4% of reading + 1% RH)
Relative Humidity
10 to 70% 0.1% ± 4% RH
Note: Above specification tests under the environment RF Field Strength less than 3 V/M & frequency
less than 30 MHz only.
All EU users are legally bound by the Battery Ordinance to return all used batteries to
community collection points or wherever batteries / accumulators are sold.
Disposal in household trash or refuse is prohibited.
Disposal: Follow the valid legal stipulations in respect of the disposal of the device at the
end of its lifecycle
Other Battery Safety Reminders
Never dispose of batteries in a fire. Batteries may explode or leak.
Never mix battery types. Always install new batteries of the same type.
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All rights reserved including the right of reproduction in whole or in part in any form
ISO-9001 Certified
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