In May 2010 the temperature testing of GSM modems and routers was started, including the exposures to high and low temperatures. The purpose of testing is functionality measurements in different temperature modes and the definition of critical temperature values. For each model the measurements are performed in the climate chamber CM 70/75-80 TX simultaneously for two devices, randomly chosen from the lot.

The positive temperature exposure measurements are performed on switched on devices (standby mode) and after 30 minute exposure at the set chamber temperature.

The negative temperature exposure measurements are performed on switched off devices after 30 minute exposure at the set chamber temperature in (cold start).

The main task of the testing is to make the device operation stable: AT-command response, network registration stability, correct data receiving and transmission; besides to define the critical temperature values for normal, extensive and limit.

Till the present time the following models of GSM modems and routers were tested:

1) iRZ MC52iT - download the results of temperature measurements for modem iRZ MC52iT (.pdf, 65 KB);

2)iRZ TC65Smart -download the results of temperature measurements for modem TC65Smart (.pdf, 70 KB);

3)iRZ MC52i-485GI - download the results of temperature measurements for modem MC52i-485GI(.pdf, 70 KB);

4)iRZ MC55i-485GI - download the results of temperature measurements for modem MC55i-485GI(.pdf, 70 KB);

5)iRZ MC55iT - download the results of temperature measurements for modem MC55iT(.pdf, 70 KB);

6)iRZ ER75iX Twin - download the results of temperature measurements for modem ER75iX Twin(.pdf, 65 KB);

7)iRZ ER75iX - download the results of temperature measurements for router ER75iX(.pdf, 65 KB);

8)iRZ MC75PU - download the results of temperature measurements for router MC75PU(.pdf, 65 KB);

9)iRZ SIM300S - download the results of temperature measurements for modem SIM300S(.pdf, 65 KB);

10)iRZ Fine-8 - download the results of temperature measurements for modem Fine-8(.pdf, 65 KB);

11)iRZ ES75 - download the results of temperature measurements for modem ES75(.pdf, 65 KB);

12)iRZ ES75iT - download the results of temperature measurements for modem ES75iT(.pdf, 65 KB);

13)iRZ HC15i - download the results of temperature measurements for modem HC15i(.pdf, 65 KB);

14)iRZ MC35S - download the results of temperature measurements for modem MC35S(.pdf, 65 KB);

15)iRZ MC35iT PU - download the results of temperature measurements for modem MC35iT PU(.pdf, 65 KB);

16)iRZ MC35i-485GI - download the results of temperature measurements for modem MC35i-485GI(.pdf, 65 KB);

17)iRZ TC65 Lite- download the results of temperature measurements for modem iRZ TC65 Lite(.pdf, 65 KB);

18)iRZ_TC65-485GI - download the results of temperature measurements for modem iRZ TC65-485GI(.pdf, 65 KB);

19)iRZ MG Terminal- download the results of temperature measurements for iRZ MG Terminal(.pdf, 65 KB);

Conclusion:

The results of testing have shown that the operation of the devices is stable – the AT-commands are responded, the network registration is stable, receiving and transmission of data is correct. Also the high humidity does not effect the visual appearance of the product. There are no corrosion and surface damage.