GB/T 2846-2011 in English

《GB/T 2846-2011调幅广播收音机测量方法》由TC242（全国音频、视频及多媒体系统与设备标准化技术委员会）归口，主管部门为工业和信息化部（电子）。

1 Scope

This standard specifies the methods of measurement for electric, sonic properties of radio receivers for AM broadcast transmissions.

It is applicable to the standard methods of measurement for electric, sonic properties of radio receivers for AM broadcast transmissions with the working frequency of 526.5kHz to 26.1MHz.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

IEC 60315-1:1988 Methods of measurement on radio receivers for various classes of emission - Part 1: General considerations and methods of measurement, including audio-frequency measurements
IEC 60315-3 Methods of measurement on radio receivers for various classes of emission - Part 3: Receivers for amplitude-modulated sound-broadcasting emissions

3 Terms and definitions

For the purposes of this document, the following terms and definitions apply.

3.1

voltage and current quantities

root mean square (r.m.s.) quantities, unless otherwise stated

3.2

presentation of level

levels of power, voltage and field strength are expressed in decibels, as shown in Figure 1

Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Conditions for measurement
4.1 Standard measuring conditions
4.2 Signal-to-noise ratio
4.3 Noise-limited sensitivity
4.4 Single-signal selectivity
4.5 Intermediate-frequency rejection
4.6 Image rejection
4.7 Spurious-response rejection
4.8 Total frequency characteristics
4.9 Harmonic distortion
4.11 Automatic gain control characteristic
4.12 Modulation hum
4.13 Single-signal howling
4.14 Step-down characteristics
4.15 Intermodulation
4.16 Maximum useful power
4.17 Performance characteristics of automatic search system
4.18 Scale error
4.19 Return difference of tuning mechanism
Annex A (Normative) Supplement and explanation of measuring conditions