QM 333 Chart: Environmental Cycle for Climatic Tests
By RF Wireless Expert Team
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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
Following designations are useful to understand the QM-333 chart.
| legend | Description |
|---|---|
| TSL | LOWEST TEMPERATURE AT WHITCH SPECIFICATIONS ARE GUARANTED |
| TSH | HIGHEST TEMPERATURE AT WHITCH SPECIFICATIONS ARE GUARANTED |
| TOL | LOWEST TEMPERATURE AT WHITCH EQUIPMENT IS TO REMAIN OPERATIONAL |
| TOH | HIGHEST TEMPERATURE AT WHITCH 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]o C/MIN. OR 5 ± 1o C |
| C | 25 ± 3o 95% RH |
| A | LESS THAN OR EQUAL TO 1o C/MIN. |
AMBIENT: 15 to 35o C, 45 to 75 RH
Tolerance:-
Temperature: ±2o 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 |