Descriptions of Panel
4-9
4.4.1 Hardware/Software AGC
The AGC function helps stabilize the output voltage when it is affected by the load.
ACV : 50V~5KV (Hardware AGC is always ON. Software AGC initial setting is ON; can be
set to O F F. )
DCV : 50V~499V (Hardware AGC initial setting is ON, can be set to O F F. Software AGC
initial setting is ON; can be set to OFF.)
DCV : 500V~6KV (Hardware AGC is always ON, software AGC initial setting is ON; can be
set to O F F. )
IR : 50V~1KV (No hardware AGC, software AGC initial setting is ON; can be set to OFF.)
Vs Vo / Vs = RL / (Rs + RL)
1. Hardware AGC: when Vo < Vs due to a load affect, the hardware AGC circuit will equalize
the voltage within 0.1sec.
2. Software AGC: This analyzer uses software AGC under DC 50V-500V and IR 50V-1000V.
Software compensation is slower than hardware compensation so it does not cause a
voltage shock to the DUT. The general IR R
L is larger than the Rs of the analyzer, so Vo ~
Vs.
4.4.2 Discharge-V
Discharge-V: The discharge function permits the user to set the value of the voltage that the
instrument will discharge to upon completion of a test. The range is 0.05kV to 5.10kV (the
default value is 3.6kV). The time it will take to discharge to a specific voltage is dependent on
the capacitance of the DUT. The discharge time is a natural log function. When the voltage
drops below the Discharg-V setting, the voltage will be discharged to 0V in 0.2sec.
4.4.3 OFFSET
1. DC OFFSET: Before testing WDC mode, connects test cable first. After the fixture is
tested, then processes OFFSET for ensure test value accuracy. The current calculation
formula: Current reading = Current real measurement value – Offset value.
2. AC OFFSET: Before testing WAC mode, connects test cable first. After the fixture is
tested, then processes OFFSET for ensure test value accuracy. Especially when test
voltage is higher and leakage current of test fixture and instrument is more increase. The
happened of Offset current is often caused by capacitance feature. According to
mathematics, when test a resistive load, its’ current value =
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