Agilent 4155B/4156B User’s Guide Vol.2, Edition 5 8-11
If You Have A Problem
When You Make A Measurement
1. Insert a large resistor between VMU and common
This method cannot be used for voltage measurement of high resistance.
Because the VMU input impedance gets lower.
2. Use SMUs instead of VMUs
This method degrades measurement accuracy and resolution than VMU due to
each unit's specification difference.
3. Insert a resistor in series to device
This method needs to
• select an appropriate resistor value for each device resistance value.
• set wait time before measurement until charge current settles.
• insert the resistor at close point to DUT to prevent damage due to the charge
in a measurement circuit. (See dotted line in the above figure)
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