Terminology » Testing » QM 333 Chart: Environmental Cycle for Climatic Tests

QM 333 Chart: Environmental Cycle for Climatic Tests

qm 333 chart climatic test environmental cycle temperature humidity

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.

QM 333 Environmental Cycle Chart

QM 333 legends

Understanding the QM-333 Chart

The following designations are useful to understand the QM-333 chart:

legendDescription
TSLLOWEST TEMPERATURE AT WHICH SPECIFICATIONS ARE GUARANTEED
TSHHIGHEST TEMPERATURE AT WHICH SPECIFICATIONS ARE GUARANTEED
TOLLOWEST TEMPERATURE AT WHICH EQUIPMENT IS TO REMAIN OPERATIONAL
TOHHIGHEST TEMPERATURE AT WHICH EQUIPMENT IS TO REMAIN OPERATIONAL
TLMINIMUM STORAGE TEMPERATURE
THMAXIMUM STORAGE TEMPERATURE
RRECOVERY 1 TO 2 HOURS FOR DAMP HEAT TESTS < 1 Hr. FOR OTHER TESTS
SRATE OF RISE OR FALL OF TEMPERATURE [(TH-TL)/15] °C/MIN. OR 5 ± 1 °C
C25 ± 3 °C, 95% RH
ALESS THAN OR EQUAL TO 1 °C/MIN.

AMBIENT: 15 to 35 °C, 45 to 75 RH

Tolerance:- Temperature: ±2 °C Humidity: ±2% RH

LegendDescription
T1 Hour
T12 Hours
T22-3 Hours
T36-8 Hours
T43-8 Hours
T53-6 Hours
T63 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 |