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1. Use the DC adjustable voltage regulator to connect to the P-N terminal of the machine
under test, and hang the multimeter pen on the P-N, and set the multimeter to DC voltage
(DC); note that the software voltage correction factor is 100% before testing. Compare the
value displayed by multimeter and keyboard
2. Measure the voltage at this point of the VPN: (get the VPN voltage from the voltage
scaling relationship)
579V homologous 5V
4. Vulnerable components op amps
5. Device bit number and specification
Resistive
R82/R83/R84/R85/R2/R3=470K/1206
R4/R5/R95/R96/R97/R98=470K/1206
Op amp
U75=LF353DRG4
S2 model
AC310 Universal AC Drive Service Manual
T3 model
1000V homologous 5V
Double diode
D70/D71=BAV99LT1G
R79/R99=10K/0805
R80/R100=4.02K/0805
C82/C87=10Nf/0805
C86/C81=100NF/0805
17
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