EUCOL U2836 - Accuracy of DCR; Safety Requirement; Insulation Resistance

U2836 Operation Manual Chapter 5 Execute LCR operation and some examples
50
Table B calibrated interpolating factor K
C
Test frequency K
c
Direct calibrated frequency 0
Other frequency 0.0003
Table C Direct Calibrated frequency
20 25 30 40 50 60 80 [Hz]
100 120 150 200 250 300 400 500 600 800 [Hz]
1 1.2 1.5 2 2.5 3 4 5 6 8 [kHz]
10 12 15 20 25 30 40 50 60 80 [kHz]
100 120 150 200 [kHz]
There are 43 frequencies in table C, there is no 250kHz and 300kHz in U2836.
Table D Cable length factor K
d
Test signal level
Cable length
0m 1m 2m
≤1.5V
rms
0
2.5×10
-4
（1+50×f
m
） 5×10
-4
（1+50×f
m
）
>1.5V
rms
0
2.5×10
-3
（1+16×f
m
） 5×10
-3
（1+50×f
m
）
f
m
: test frequency [MHz]
Table E Temperature factor K
e
Tem pe rature（℃）
5 8 18 28 38
K
e
6 4 2 1 2 4
6.3.9 Accuracy of DCR
A(1+R
x
/5MΩ+16mΩ/R
x
)[%] ±0.2mΩ
When the instrument is in Middle and slow speed，A=0.25
In Fast speed, A=0.5
Where, R
x
is the tested resistance.
6.4 Safety requirement
The instrument is the Ⅰ class safety instrument.
6.4.1 Insulation resistance
Under reference working condition，the insulation resistance between power
terminal and instrument jacket should not be smaller than50MΩ.
Under humility condition, the insulation resistance between voltage terminal and
instrument jacket should not be smaller than 2 MΩ.