Datasheet

Radial Super Capacitor
RND is a trademark of Distrelec
Figure 4–Circuit for a.c. resistance method
Measuring method
The internal resistance Ra of a capacitor shall be calculated by the following formula:
Ra is the a.c. internal resistance (Ω)
U is the effective value of a.c. voltage (V r.m.s.)
I is the effective value of a.c. current (V r.m.s.)
The frequency of the measuring voltage shall be 1 kHz The a.c. current shall be from 1 mA to 10
mA, equipment: Multi frequency LCR Bridge
B、DC impedance method
Measuring method
The measuring circuit taking constant current discharging method ,，with rated
voltage ,measuring capacitor terminal voltage with voltage recorder .switch S shift to DC supply
power ,apply voltage charging for 30 min after constant voltage supply power reach to rated
voltage
After charging for 30 minutes, turn the switch S to the d.c. power supply，discharging as rated
current according as figure 3 .record the terminal voltage of capacitor with voltage recorder .
Calculate inter resistance Rd according formula as below :
Rd DC inner resistance
（
Ω
）；
ΔU3 voltage drop
（
V
）；
I discharging current
（
A
）。
Charging current I based on figure 3
Figure 3– charging current
classification
HT
、
HV
、
X SE
、
HE SP
、
MK LR
、
HP
、
HEV
、
LEV
I（mA）
10×C 4×CU
R
40×CU
R
400×CU
R
Noted: C is rated capacitance，F is farad ，U
R
is rated voltage，unit is V
（voltage）
a) If ∆U3 exceeds 20 % (0.2 × UR) of the charging voltage in the initial characteristics, the current value may be reduced by
one half, one fifth or one tenth.
b) The number of significant digit for the discharge current value of 10 A or less shall be one digit; the second digit of the
calculated value should be rounded
c) The number of significant figures for the discharge current value exceeding 10 A shall be two digits; the third digit of the
calculated value should be rounded down.