MIL-STD-202H.pdf - 第276页

MI L - S TD - 202 - 308 5. DETAILED REQUI RE M E N T S 5.1 Summary . The fol l ow i ng det ai l s ar e t o be s p ec i f i ed i n t h e i nd i v i dua l s pec i f i c at i on: a. Required value s o f t he " m i c r …

MIL-STD-202-308

Another possible source of measurement uncertainty is the transitory variations in current noise which may

immediately follow application of dc voltage. Certain types of resistors tend to display very little, if any, transitory

variations, whereas other types tend to display such variations to a measurable degree. For those resistors which

exhibit such variations, the current noise usually settles to a more stable value after a short time, from 1 to several

seconds. In some cases, the current-noise variations may continue to be relatively large and unstable for extended

periods of time. Such resistors are usually very noisy. By adhering to the precautions regarding the procedures

stated in 1.1, the effects of such variations on repeated measurements are reduced.

TABLE 2. Correction factor for presence of "system noise".

| | || | |

| T-S | f(T-S) || T-S | f(T-S) |

| dB | Correction factor || dB | Correction factor |

| | || | |

| 1.0 | 6.9 || 4.3 | 2.0 |

| 1.1 | 6.5 || 4.4 | 1.9 |

| 1.2 | 6.2 || 4.5 | 1.9 |

| 1.3 | 5.9 || 4.6 | 1.8 |

| 1.4 | 5.6 || 4.7 | 1.8 |

| 1.5 | 5.3 || 4.8 | 1.7 |

| 1.6 | 5.1 || 4.9 | 1.7 |

| 1.7 | 4.9 || 5.0 | 1.6 |

| 1.8 | 4.7 || 5.1 | 1.6 |

| 1.9 | 4.5 || 5.2 | 1.5 |

| 2.0 | 4.3 || 5.3 | 1.5 |

| 2.1 | 4.1 || 5.4 | 1.4 |

| 2.2 | 3.9 || 5.5 | 1.4 |

| 2.3 | 3.8 || 5.6 | 1.4 |

| 2.4 | 3.6 || 5.7 | 1.3 |

| 2.5 | 3.5 || 5.8 | 1.3 |

| 2.6 | 3.4 || 5.9 | 1.3 |

| 2.7 | 3.3 || 6.0 | 1.2 |

| 2.8 | 3.2 || 6.1 | 1.2 |

| 2.9 | 3.1 || 6.2 | 1.2 |

| 3.0 | 3.0 || 6.3 | 1.1 |

| 3.1 | 2.9 || 6.4 | 1.1 |

| 3.2 | 2.8 || 6.5 to 6.9 | 1.0 |

| 3.3 | 2.7 || 7.0 to 7.3 | 0.9 |

| 3.4 | 2.6 || 7.4 to 7.9 | 0.8 |

| 3.5 | 2.5 || 8.0 to 8.5 | 0.7 |

| 3.6 | 2.4 || 8.6 to 9.3 | 0.6 |

| 3.7 | 2.4 || 9.4 to 9.9 | 0.5 |

| 3.8 | 2.3 || 10.0 to 11.5 | 0.4 |

| 3.9 | 2.2 || 11.6 to 12.7 | 0.3 |

| 4.0 | 2.2 || 12.8 to 14.5 | 0.2 |

| 4.1 | 2.1 || 14.6 to 15.0 | 0.1 |

| 4.2 | 2.0 || M15.0 | ≈ 0 I

I I

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MIL-STD-202-308

5. DETAILED REQUIREMENTS

5.1 Summary. The following details are to be specified in the individual specification:

a. Required values of the "microvolts-per-volt-in-a-decade" index (see 4.2.3).

b. Ambient temperature, if other than that specified (see 4.2.1).

c. Value of dc voltage, if other than those stated in table 1 (see 4.1.1.1 and 4.2.1).

6. NOTES

(This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.)

6.1 Supersession data. The main body and 38 parts of this revision of MIL-STD-202 replace superseded MIL-STD-

202.

Custodians: Preparing activity:

Army - CR DLA – CC

Navy - EC

Air Force - 85 (Project 59GP-2015-038)

DLA - CC

Review activities:

Army - AR, AT, AV, CR4, MI, SM, TE

Navy - AS, OS, SH

Air Force - 19, 99

NSA - NS

NOTE: The activities listed above were interested in this document as of the date of this document. Since

organizations and responsibilities can change, you should verify the currency of the information above using the

ASSIST Online database at https://assist.dla.mil/

北测（上海）电子科技有限公司

联系方式：xuyj@beice-sh.com 13917165676

INCH-POUND

MIL-STD-202-309

18 April 2015

SUPERSEDING

MIL-STD-202G

w/CHANGE 2 (IN PART)

28 June 2013

(see 6.1)

DEPARTMENT OF DEFENSE

TEST METHOD STANDARD

METHOD 309, VOLTAGE COEFFICIENT OF RESISTANCE DETERMINATION PROCEDURE

AMSC N/A FSC 59GP

北测（上海）电子科技有限公司

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