6253 DC Voltage Current Source/Monitor Operation Manual
4.1.3 Preventing Oscillation
4-4
4.1.3 Preventing Oscillation
The DUT itself may oscillate, or the 6253 may oscillate if capacitance or inductance exceeding the
specified value is connected (due to stray capacitance or retained inductance from connected cables, a
scanner, or a fixture).
Judge whether the DUT or the 6253 oscillates by the oscillation frequency. The 6253 does not oscillate at
2 MHz or over.
4.1.3.1 Preventing 6253 Oscillation
1. Causes
• Oscillation may occur because of the capacitive load at voltage source or while the voltage limit
is activated.
• Oscillation may occur because of the inductive load at current source or while the current limit
is activated.
2. Solution
Remove the causes of oscillation according to the following procedure:
1. Verify if the load capacitance or load inductance does not exceed the maximum
load capacitance or load inductance specified in Chapter 8,
“SPECIFICATIONS.”
2. Check if the 6253 still oscillates when cables of the shortest lengths are
connected.
3. If the shorter cables stop the oscillation, then connect cables as shown in Figure
4-3 to reduce the capacitance and inductance of the cables and other devices.
4. If the oscillation does not stop even if the cables are the shortest possible, insert
an allowable resistor for the DUT as shown in Figure 4-5.
NOTE: When more than one power supply unit is used, oscillation in
one unit may cause oscillation in other units. Then find the
particular power supply that may stop the oscillation, following
the procedure from 1 to 4 above.
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