RFQM 333 Chart: Environmental Cycle for Climatic Tests
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This page describes the QM 333 Chart, an Environmental Cycle Chart used for climatic tests. This chart is useful for testing RF, Wireless, and electronic systems.
Understanding the QM-333 Chart
The following designations are useful to understand the QM-333 chart:
| legend | Description |
|---|---|
| TSL | LOWEST TEMPERATURE AT WHICH SPECIFICATIONS ARE GUARANTEED |
| TSH | HIGHEST TEMPERATURE AT WHICH SPECIFICATIONS ARE GUARANTEED |
| TOL | LOWEST TEMPERATURE AT WHICH EQUIPMENT IS TO REMAIN OPERATIONAL |
| TOH | HIGHEST TEMPERATURE AT WHICH EQUIPMENT IS TO REMAIN OPERATIONAL |
| TL | MINIMUM STORAGE TEMPERATURE |
| TH | MAXIMUM STORAGE TEMPERATURE |
| R | RECOVERY 1 TO 2 HOURS FOR DAMP HEAT TESTS < 1 Hr. FOR OTHER TESTS |
| S | RATE OF RISE OR FALL OF TEMPERATURE [(TH-TL)/15] °C/MIN. OR 5 ± 1 °C |
| C | 25 ± 3 °C, 95% RH |
| A | LESS THAN OR EQUAL TO 1 °C/MIN. |
AMBIENT: 15 to 35 °C, 45 to 75 RH
Tolerance:- Temperature: ±2 °C Humidity: ±2% RH
| Legend | Description |
|---|---|
| T | 1 Hour |
| T1 | 2 Hours |
| T2 | 2-3 Hours |
| T3 | 6-8 Hours |
| T4 | 3-8 Hours |
| T5 | 3-6 Hours |
| T6 | 3 Hours |
| Equipment Category | Location | TOL | TSL | TOH | TSH | TL | TH | | :----------------- | :----------- | :----- | :— | :— | :— | :------ | :------ | --- | | A | AC ROOMS | 0 | 20 | 35 | 30 | -5 | 60 | | B | NON AC | -5 | 0 | 55 | 50 | -5 | 60 | | C | BURIED | 5 | 15 | 40 | 35 | -5 | 60 | | D | POLE MOUNTED | -10(0) | | 55 | 60 | -15(-5) | -15(-5) | 60 |
