Tonghui TH2827 Series - Accuracy of DCR; Safety Requirement; Insulation Resistance; Insulation Intensity

TH2827 Series Operation Manual Chapter 7 Command Reference
75
Table F 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]
100 120 150 200 250 300 400 500 600 800 [kHz]
1 [MHz]
Cable length factor K
d
0.15%×(F
m
/ 1MHz)
2
× L
2
F
m
: test frequency [MHz]
L: test cable length [m], respectively 0m, 1m, 2m
Table G Temperature factor K
e
Temperature (℃) 0 - 18 18 - 28 28 - 40
Ke 4 1 4
6.3.9 Accuracy of DCR
A (1+R
x
/5M+16m/R
x
)[%] ±0.2m
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 than50M.
Under humility condition, the insulation resistance between voltage terminal and
instrument jacket should not be smaller than 2 M.
6.4.2 Insulation intensity
Under reference working condition, the insulation between the power terminal