Voltech AT3600 - Page 371

VOLTECH AT3600 USER MANUAL SPECIFICATION
SPECIFICATION VPN 98 - 024 PAGE 8.1.13.
IR TEST
The accuracy is based on the test conditions chosen to measure the insulation
resistance, and is given as:
where
A
T
is the total accuracy (%)
A
R
is the basic relative accuracy (%)
A
C
is the calibration accuracy (%)
A
I
is the correction for current level (%)
A
Z
is the correction for impedance level (%)
The value of A
R
is given in the table in section 1.1 of this chapter.
The values of the other factors are given below.
where
I
M
is the measured current (A)
Z
M
is the measured IR value (MΩ)
A =
C
0.03%
A = + ( I )
I
3.2% 0.000002% /
M
A = 0.5% + (0.001% Z x
Z
M
)
A =
A
T
R
CIZ
+A +A +A