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A40B 精密分流器

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Fluke A40B精密分流器包含14个低电感同轴分流器,测量电流范围从0.1mA至100A.A40B 精密分流器主要用于在实验室测量交直流电流和校准交直流电流转换测量装置.
  

A40B 精密分流器图片
A40B 精密分流器图片

更优异的性能指标
Fluke A40B 精密分流器包含14个低电感同轴分流器,测量电流范围从0.1mA 至100A。主要用于在实验室测量交直流电流和校准交直流电流转换测量装置。 A40B分流器的分流器内部的物理结构和元件的精密性保证了它的频率响应非常平坦,电阻值非常稳定、准确,具有出色的低自加热功率系数和低温度系数,可以用于直接测量电流从直流到100kHz,直流电流准确度达 20 ppm,交流电流准确度达 23 ppm,远远高于之前的所有分流器装置。因此,现在精密电流测量可以直接根据分流器电阻值的换算,而不一定要使用传统复杂的交直流转换转换方法了。

更广泛的应用
用A40B分流器和测量电压仪器配合使用,可以直接精确测量交直流电流,校准各种校准器的电流功能,支持大电流跨导放大器的校准。由于A40B相位偏移极低,这一特点对交流功率测量,尤其是非正弦波形的测量非常关键,可以在电能质量分析和数字功率表的作电流采样器获得电流信号的幅值和相位。

更灵活的使用
A40B分流器的电压输出标称值为0.8V。相对于传统的45/75 mV分流器,输出电压高,大大提高了信噪比,可以非常方便地配用精密电压表或其他测量仪器,100A电流对应的电阻为8mW,随着电阻增加到80W,电流量程为10mA。另外,1mA的分流器有内部有一个电池供电的缓冲放大器,可以驱动输出电压,使得 800W 的分流电阻与测量装置产生最小的相互影响。
A40B分流器出厂附带着可溯源的校准报告。如客户需要,可选购符合17025A标准要求的校准报告。

Absolute accuracy

The following table shows the 1-year absolute accuracy specification stated at k=2, approximately 95 % confidence for the calibrated value. The specifications include 1-year stability, temperature effects over TCal ± 1 °C, and the measurement uncertainty of the calibrated value.
Shunt Nominal Current:
Specification ± μA/A, TCal ±1 °C, ≤ 50 % RH 1,2,3,5
 
DC
1 kHz
100 kHz
1 mA
20
55
150
10 mA
20
26
26
20 mA
20
26
26
50 mA
20
23
23
100 mA
20
24
24
200 mA
20
26
26
500 mA
21
27
28
1 A
21
27
31
2 A
21
27
48
5 A
21
31
71
10 A
26
37
92
20 A
26
43
113
50 A
32
55
144
100 A
35
65
174
1 The measured current is determined from: I = (V/Rcalibrated) ×
(1 + (AC-DCcalibrated/1,000,000)); where AC-DC calibrated is expressed in ppm.
2 Above 1 kHz interpolate the specification (si) between frequencies fupper and flower using:
si = slower + (fi – flower) × (supper – slower) ÷ (fupper – flower)
3 Add 20 μA/A if relative humidity is outside specification limits.
4 1 mA specifications apply with the battery charger disconnected.
5 Specifications assume no loading effects due to the voltage-sensing device. See Output Voltage Measurement – Loading Effects in the operating information.

Maximum AC-DC Difference

Shunt Nominal Current:
Maximum AC-DC Difference (± ppm)1,2
 
1 kHz
100 kHz
1 mA3
53
150
10 mA
20
40
20 mA
18
30
50 mA
13
16
100 mA
14
27
200 mA
17
28
500 mA
17
21
1 A
17
23
2 A
17
44
5 A
23
69
10 A
28
98
20 A
37
150
50 A
47
180
100 A
60
300
1 Specifications indicate the maximum flatness deviation from dc, and include both measured AC-DC difference and the uncertainty of measurement. They are stated at k=2, approximately 95 % confidence.
2 Includes 1-year stability of the AC-DC difference.
3 Specifications for the 1 mA current shunt are for TCal ± 1 °C.

General Specifications
Dimensions (maximum)
Shunt Value:
1 mA to 2 A
Height:
70 mm (2.75 in)
Width:
70 mm (2.75 in)
Overall Length1:

124 mm (4.9 in)
Shunt Value:
5 A to 20 A
Height:
130 mm (5 in)
Width:
130 mm (5 in)
Overall Length1:

210 mm (8.25 in))
Shunt Value:
50 A and 100 A
Height:
200 mm (7.9 in)
Width:
200 mm (7.9 in)
Overall Length1:

343 mm (13.5 in))
1 Includes input and output connectors; subject to change by component vendor.
Physical/mechanical parameters
Shunt Value:
1 mA to 20 A
Weight:
0.7 kg (1.6 lb)
Input Connector:
Type-N (female)
Output Connector:
Type-N (female)
Shunt Value:
50 A and 100 A
Weight:
3.4 kg (7.5 lb)
Input Connector:
Type-LC (female)
Output Connector:
Type-N (female)
Operating environment
Temperature:
13 °C to 33 °C
Calibration temperature (TCal) range:


18 °C to 28 °C
Humidity range for best specification 1,2:

≤ 50 % RH
Altitude:
0 m to 3,000 m


1 Resistance stability is affected by humidity, but changes are reversible.
2 If the shunts are calibrated outside this RH, stability specifications will be met as long as the shunts are stored and used at the same relative humidity ± 10 % RH.
Storage and transit environments (for models other than the 1 mA current shunt)
Temperature to avoid damage:

-20 °C to 140 °C
Temperature and humidity to maintain performance1:


5 °C to 45 °C; 15 % to 80 % RH
Non-operating altitude:

0 m to 12,000 m


1 Storage at extremes of temperature or humidity will cause a temporary change of shunt resistance by up to ± 20 ppm. When subsequently stored or used within the limits of the operating environment, the shunts will recover to their original resistance value within 30 days.

Additional 1 mA current shunt specifications
Output resistance
8 mΩ
Maximum safe output current
11 mA (e.g., 1 V output into 90 Ω)
Maximum capacitive load
800 pF
Output voltage regulation
15 ppm/100 pF
Maximum output dc v offset
± 100 μV (typical ± 25 μV)
Typical error @ 1 MHz
< 2 %

Battery specifications
Battery size
AAA (44.5 mm x 10.5 mm)
Battery technology
Nickel-Metal Hydride (NiMH)
Number of batteries required
8 (in 2 groups of 4)
Nominal battery voltage
1.2 V (4.8 V per group of 4)
Typical battery capacity
800 mAh
Storage and transit environment to preserve the batteries
Less than 90 days:
-20 °C to 40 °C
Less than one year:
-20 °C to 30 °C
Charging time (from fully discharged):
100 minutes
Maximum operating time between charges
Maximum output load (11 mA):

18 hours
High impedance load:
24 hours
Recommended cooling period:
100 minutes
To prevent loss of battery capacity recharge at least twice per year.

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