◇
20
Figure4-4.2
3.
At 0.6S before the completion of the test, the current range is switched to the appropriate low
range, which is 0.092mA in Figure 4-4.3.
Figure4-4.3
4.2.1.5 Electric Shock Protection
Note:
The output power of this tester can reach 500VA and the output current reaches 100mA (AC
withstand voltage testing mode). In the event of an electric shock, the situation is already very
serious, causing the operator to stun or even die. Therefore, in case that the tester allows, turn on the
electric shock protection function or select the high-voltage floating output tester (TH9110).
The electric shock protection setting has three options, namely OFF, ON and FLOAT (only TH9110
has high-voltage floating output function). OFF and ON means the function is turned off and on.
FLOAT means that the two high voltage output HV1 (high end), HV2 (low end) are isolated from
the earth (with very high insulation resistance), for details, see the floating part description below.
a)
When the electric shock protection is set to ON, when the operator is in contact with the high
voltage output terminals, as shown in Figure 4-5, the current meter measures different current
values respectively, then the current flowing through the body i3 = i2 – i1, when i3 exceeds the
limit, immediately cut off the high voltage output to protect the safety of the operator.
Figure 4-5
b)
When the electric shock protection is set to FLOAT, the high-voltage output high terminal HV1,
Summary of Contents for TH9110
Page 42: ...42 Take the External Power Supply as an Example...
Page 43: ...43...
