FCC TITLE 47 CFR PART 15 有意发射产品测试桌高度相关事项-ANSI C63.10-2013

FCC 自 06/12/2015开始，要求使用intentional radiators (ANSI C63.10-2013)标准执行测试，于2016年7月13日强制执行实施。

A one-year transition period is provided in the rules, which requires that these standards be used by July 13, 2016.新旧标准版本转换期一年，转换期截止到July 13, 2016。

Unlicense 无线设备从现在开始用新标准，对于1G 以上辐射测试须要用1.5m高桌子进行setup ，详细如下图所示：

FCC test setup

Figure 4 —Test arrangement for radiated emissions (tabletop product)

1—A LISN is optional for radiated measurements between 30 MHz and 1000 MHz but not allowed for measurements
below 30 MHz and above 1000 MHz (see 6.3.1). If used, then connect EUT to one LISN. Unused LISN measuring port
connectors shall be terminated in 50 Ω loads. The LISN may be placed on top of, or immediately beneath, the reference
ground plane (see 6.2.2 and 6.2.3.2).
1.1—LISN spaced at least 80 cm from the nearest part of the EUT chassis.

2—Antenna can be integral or detachable, depending on the EUT (see 6.3.1).

3—Interconnecting cables that hang closer than 40 cm to the ground plane shall be folded back and forth in the center
forming a bundle 30 cm to 40 cm long (see 6.3.1).

4—For emission measurements at or below 1 GHz, the table height shall be 80 cm. For emission measurements above 1 GHz, the table height shall be 1.5 m for measurements, except as otherwise specified (see 6.3.1 and 6.6.3.1).

6.3.1 Test arrangement
Figure 4 shows the typical arrangement of an unlicensed wireless device on a tabletop on a test site. Tabletop devices shall be placed on a nonconducting platform with nominal top surface dimensions 1 m by 1.5 m. For emissions testing at or below 1 GHz, the table height shall be 80 cm above the reference ground plane.45 For emission measurements above 1 GHz, the table height shall be 1.5 m (see 6.6.3.1). A method for evaluating the effects of the table on EUT radiated emissions is given in 5.5 of CISPR 16-1-4:2010 for frequencies up to 18 GHz. The EUT shall be set up in its typical configuration and arrangement and operated in its various modes as described in 5.10. An antenna shall be connected to the EUT in accordance with 5.8 and 5.10.4. The EUT and transmitting antenna shall be centered on the turntable. For devices with multiple antennas that are active simultaneously, the EUT shall be positioned, to the extent possible, with the antennas equally distributed around the center of the device. The exact setup shall be documented in the test report.

Any controlling device (e.g., notebook, laptop, or desktop computer) shall be positioned such that it shall not significantly influence the measurement results. No other peripherals are required to be connected to the controlling device for this test unless the radio is being tested as part of the notebook or PDA qualifications.

External antenna(s) shall be positioned for maximum radiated emissions. If the EUT is equipped with or uses an adjustable antenna, then the EUT antenna shall be manipulated through typical positions and lengths during exploratory testing to maximize emission levels. For high-gain antennas or antennas that are
not structurally supported by the EUT, a nonmetallic supporting structure shall be used. EUTs with integral antennas shall be evaluated in their normal orientation. Where EUTs are designed to be installed in one of two orientations (such as wireless access points that can be located horizontally on a table or mounted vertically to the wall), these devices shall be tested in both orientations.

EUTs that can be operated in multiple orientations (such as handheld, portable, or modular devices) shall be tested in three orientations. However, in all cases, the antenna shall be adjusted and the EUT orientated to permit the measurement of the maximum emission from the EUT. For example, a device that is intended to radiate downward in normal operation shall be tested in an orientation that permits the measurement of the maximum level of the downward radiation; see Figure 9 and Figure 7.

When rotating the EUT, the maximum antenna coupling between the EUT and the measurement antenna must be achieved at some point during the rotation.

When testing tabletop equipment on a test site that meets the validation requirements of Figure 4 with the LISN in place, the LISN may remain in place; otherwise, the LISN shall be removed. Below 30 MHz, the LISN shall be removed, unless it is located below the ground plane. Unused LISN measuring port
connector(s) shall be terminated in 50 Ω load(s).

A typical arrangement for floor-standing equipment is shown in Figure 6, except that the LISNs located above the ground plane shall be removed for radiated measurements. The applicable comments in 6.3 also apply to “floor-standing equipment.” Where possible, the antenna(s) of the EUT shall be located at a height
of 1.5 m above the floor, and the intentional radiator circuitry shall be located within the system at a height of at least 0.8 m above the floor.

Interconnecting cables that hang closer than 40 cm to the ground plane shall be folded back and forth in the center, forming a bundle 30 cm to 40 cm long.

6.6.3.1 Tabletop equipment
For emission measurements above 1 GHz, the EUT shall be placed at a height of 1.5 m above the floor on a support that is RF transparent for the frequencies of interest.51 The 1.5 m height EUT support shall be constructed using a low permittivity and low loss tangent (tanδ) material with a height of 1.5 m, or a low
permittivity and low loss tangent (tanδ) material may be placed on top of a typical table with a height of 0.8 m or 1 m. One typical low-permittivity and low-loss tangent material is styrene. Due to its dielectric properties for frequencies above 1 GHz, the use of styrene or building insulation foam is recommended,
rather than, for example, wood. Support equipment shall be placed far enough away from the EUT, such that changes in relative position of the EUT and support equipment do not cause changes in measured values. Final measurements for the EUT require a measurement antenna height scan of 1 m to 4 m.

Where possible, the methods for portable, handheld, or body-worn equipment detailed in 6.6.3.3 may be employed for smaller tabletop equipment to allow the use of shorter cabling between measurement antennas and measuring receiver/spectrum analyzer by restricting the upper height of the measurement antenna.

1G以上高度并非绝对的，要看样品大小和天线位置，天线位置接近1.5m高度即可~