KEW6310 16.7.5 Capacitance calculation
KEW6310 16.8
16.7.5 Capacitance calculation
Display item
Same to W Range (except for the change from PA to C)
Save item (Measurement data at W Range) + (calculated capacitance value)
Formula
[] []
F
Vf
P
kPC
μ
θθθθ
)1
cos
1
1
cos
1
(
2
10
var)1
cos
1
1
cos
1
(
0
2
1
22
9
0
2
1
2
−−
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
−×
×
×
=−−
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
−×=
−
−
−
−
−
π
C : Capacitance needs for improvement
P : Load power [kW]
ｆ : Frequency
V : Voltage
1
cos
: New power factor (target)
16.8 Other specifications
(1) AC power supply
Voltage range AC100 ~ 240V±10%
Frequency 45 ~ 65Hz
Power consumption 20VA max
(2) DC power supply
Dry battery Rechargeable battery
Type Alkaline (LR6) Ni-MH(HR-15-51)
Rated voltage DC9V (=1.5Vx6) DC7.2V (=1.2Vx6)
Current consumption 500mA typ.(@9V) 560mA typ.(@7.2V)
Possible measurement time Backlight ON: 1 hour
Backlight OFF: 2 hours
(ref. at 23ºC)
Backlight ON: 2 hours
Backlight OFF: 5 hours
(ref. at 23ºC after full-charge)
(3) Battery charge
Charging voltage approx 9V
Charging current approx 400mA
Charging pattern Charging pattern is as follows to control whole current consumption.
Pattern Charging Pause Total
charging time
I. Power
ON
，
LCD_ON
0.7 4.3 48
II. Power
ON
，
LCD_OFF
2.1 2.9 14
III. Power
OFF
4.2 0.8 7
[min] [hour]
Start charging Following should be completely met.
- Supply of power from AC power supply
- Selector switch is set to “Rechargeable battery” position.
- Operation to start battery charge
Finish charging Battery charge stops if any of following is met.
<For Pattern I, II>
(1) power from AC power supply is stopped,
(2) selector switch is set to “Dry battery” position,
(3) 48hours later from the start of battery charge,
(4) Battery voltage becomes lower than that checked at previous pause period,
(5) charging voltage is 9.5V or more (batteries are removed),
(6) specific charging cycle is exceeded.
<For Pattern III>
Battery charge stops if Any of (1), (4), (5), (6) is met.
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