MIL-STD-810H, Environmental Engineering Considerations and Laboratory Tests
Last Updated 29 Oct 2026
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507.6 HUMIDITY CONTENTS
1.
SCOPE
1
1.1
PURPOSE
1
1.2
APPLICATION
1
1.3
LIMITATIONS
1
2.
TAILORING GUIDANCE
1
2.1
SELECTING THE HUMIDITY METHOD
1
2.1.1
EFFECTS OF WARM, HUMID ENVIRONMENTS
2
2.1.2
SEQUENCE AMONG OTHER METHODS
2
2.2
SELECTING PROCEDURES
2
2.2.1
PROCEDURE SELECTION CONSIDERATIONS
3
2.2.2
DIFFERENCE BETWEEN PROCEDURES
3
2.3
DETERMINE TEST LEVELS, CONDITIONS, AND DURATIONS
3
2.3.1
TEST TEMPERATURE - HUMIDITY
3
2.3.2
TEST DURATION
5
2.3.3
TEST ITEM CONFIGURATION
7
2.3.4
ADDITIONAL GUIDELINES
7
2.4
OPERATIONAL CHECKOUT
7
2.4.1
PROCEDURE I (INDUCED CYCLES B1, B2, OR B3, FOLLOWED BY NATURAL CYCLES B1, B2, OR B3)
7
2.4.2
PROCEDURE II - AGGRAVATED
7
2.5
TEST VARIATIONS
7
2.6
PHILOSOPHY OF TESTING
7
2.6.1
PROCEDURE I - INDUCED (STORAGE AND TRANSIT) CYCLES
8
2.6.2
PROCEDURE I - NATURAL CYCLES
10
2.6.3
PROCEDURE II - AGGRAVATED CYCLE (FIGURE 507.6-7)
13
3.
INFORMATION REQUIRED
14
3.1
PRETEST
14
3.2
DURING TEST
15
3.3
POST-TEST
15
4.
TEST PROCESS
15
4.1
TEST FACILITY
15
4.1.1
GENERAL DESCRIPTION
15
4.1.2
FACILITY DESIGN
15
4.1.3
TEST SENSORS AND MEASUREMENTS
15
4.1.4
AIR VELOCITY
16
4.1.5
HUMIDITY GENERATION
16
4.1.6
CONTAMINATION PREVENTION
16
4.2
CONTROLS
16
4.3
TEST INTERRUPTION
16
4.3.1
INTERRUPTION DUE TO CHAMBER MALFUNCTION
16
4.3.2
INTERRUPTION DUE TO TEST ITEM OPERATION FAILURE
17
4.4
TEST EXECUTION
17
4.4.1
PREPARATION FOR TEST
17
4.4.1.1
TEST SETUP
17
4.4.1.2
PRELIMINARY STEPS
17
CONTENTS - Continued
Paragraph
Page
4.4.1.3
PRETEST CHECKOUT
17
4.4.2
TEST PROCEDURES
17
4.4.1.3
PRETEST CHECKOUT
17
4.4.2
TEST PROCEDURES..
17
4.4.2.1
PROCEDURE I - STORAGE AND TRANSIT CYCLES (CYCLES B2 OR B3), AND NATURAL (CYCLES B1, B2, OR B3..
17
4.4.2.2
PROCEDURE II - AGGRAVATED
18
5.
ANALYSIS OF RESULTS.
19
6.
REFERENCE/RELATED DOCUMENTS
19
6.1
REFERENCED DOCUMENTS
19
6.2
RELATED DOCUMENTS
19
TABLES
TABLE 507.6-I
HIGH HUMIDITY DIURNAL CATEGORIES
5
TABLE 507.6-II
TEST CYCLES (DAYS)
7
TABLE 507.6-III
CONSTANT TEMPERATURE AND HUMIDITY - INDUCED CYCLE B1
8
TABLE 507.6-IV
CYCLIC HIGH RELATIVE HUMIDITY - INDUCED CYCLE B2
9
TABLE 507.6-V
HOT HUMID - INDUCED CYCLE B3
10
TABLE 507.6-VI
CONSTANT TEMPERATURE AND HUMIDITY - NATURAL CYCLE B1
11
TABLE 507.6-VII
CYCLIC HIGH RELATIVE HUMIDITY - NATURAL CYCLE B2
12
TABLE 507.6-VIII
HOT HUMID - NATURAL CYCLE B3
13
TABLE 507.6-IX
AGGRAVATED CYCLE
14
FIGURES
FIGURE 507.6-1
INDUCED CYCLE B1 - STORAGE AND TRANSIT
8
FIGURE 507.6-2
INDUCED CYCLE B2 - STORAGE AND TRANSIT
9
FIGURE 507.6-3
INDUCED CYCLE B3 - STORAGE AND TRANSIT
10
FIGURE 507.6-4
NATURAL CYCLE B1 - CONSTANT HIGH HUMIDITY
11
FIGURE 507.6-5
NATURAL CYCLE B2 - CYCLIC HIGH HUMIDITY
12
FIGURE 507.6-6
NATURAL CYCLE B3 - HOT HUMID
13
FIGURE 507.6-7
AGGRAVATED TEMPERATURE - HUMIDITY CYCLE
14
METHOD 507.6, ANNEX A PHYSICAL PHENOMENA ASSOCIATED WITH HUMIDITY
1.
ABSORPTION
A-1
2.
ADSORPTION
A-1
3.
BREATHING
A-1
4.
CONDENSATION
A-1
5.
DIFFUSION
A-1
MIL-STD-810H
METHOD 507.6
METHOD
507.6 HUMIDITY
NOTE: Tailoring is essential. Select methods, procedures, and parameter levels based on the tailoring process described in Part One, paragraph 4.2.2, and Annex C. Apply the general guidelines for laboratory test methods described in Part One, paragraph 5 of this Standard.