PDSH 998 Measurement of circuit power factor and supply current

小米

广东安规检测
有限公司提供：

小型摆管淋雨试验机

IPX5X6X7喷水试验机

1000L恒温恒湿箱

各种试验指现货

可程式恒温恒湿试验箱

水平垂直燃烧机

自动卷线器试验机

耐划痕试验机

各种灯头量规现货

灼热丝试验机现货

GB1002插头量规

IPX1-X7淋雨现货

IEC61347/UL935镇流器热试验箱

灯具防风罩

IK冲击试验机

UL498插头插座量规

VDE0620插头插座量规

稳定性试验台

家电温升测试角

针焰试验机现货

热电偶焊机现货

家电125mm试验指

E12灯头量规

无绳壶无绳电熨斗插拔寿命试验机

IEC60335试验指甲

PDSH 998 ! `2 M4 _& H+ b. W) G9 r3 E $ ~, O6 r9 K1 p+ C3 c' h

Measurement of circuit power factor and supply current 5 R/ Q) C2 ^4 C% Y2 S( }

General

60968(ed.1);am1;am2 & 60969(ed.1);am1;am2 # r: ]) C9 |0 T% m1 Q

2 @) c! t5 Z5 q' ZStandard(s):
# U! H, W' H* }" p5 i. ~IEC 60968 All editions
IEC 60969 All editions
Subclause(s): General
No. Year PDSH 0998 2010
6 v2 n* Q" e7 |- W4 Q/ M  oCategory: LITE
. i8 \: M8 G$ b! X9 L8 eDeveloped by: ETF5 OSM/LUM
. T8 I" H. M9 ESubject:
3 j- Q( B; P% R* l5 N, z/ t/ zMeasurement of circuit power factor and supply current
' ]6 D1 g4 o6 u0 Q5 B2 RKey words:
- True power factor
1 q* K" t" F. ]6 ?- Supply current
- High frequency components
; `" O% R$ |- zTo be approved at the 49th CTL Plenary Meeting, in 2012
Question:
When measuring the circuit power factor and supply current of non linear load (a self-ballasted lamp), we
" T% l+ k+ s( Q$ O- Jwould like to check if there is a need to consider the frequency range of the power meter. The product in
* ^" N4 C2 J  \question produced high frequency components as shown in Figure 1. The true power factor can only be
measured with power meter set to encompass these high frequencies. With the power meter’s frequency range
specified from d.c. to 25 KHz, the power meter reads a power factor of 0,880 and a current of 330 mA. As the
- Q$ K$ ?: w/ E3 u" T- bfrequency range was extended to 50 KHz, we found the power factor is much lower compared with cos f
(power factor measured at fundamental frequency). Which value of power factor can we accept on the product
1 k1 d2 D8 x0 v8 x0 L6 g+ }or on the manufacturer catalogue?
Decision:
In case of high harmonics and high crest factor, to get an accurate measurement, a power meter with a higher
frequency range has to be used.
6 f" o* F' ?( M, R
- f" ], Y! z  r

1 w4 _) ^" K$ i) r# ^
& Z! C2 b( s" c# T' b& m7 l4 Y
: V0 w2 U% m  o- a. ^8 m
# N; ?# B6 Q! X$ T9 Z% A) ~1 J