1 Getting Started Tutorial
42 Keysight U3402A User’s and Service Guide
Performing diode/continuity test
Testing diodes
The diode test measures the forward voltage of a semiconductor junction of
approximately 0.5 mA. The beeper will emit a single beep tone when the input
voltage is below +0.7 V (approximately 1.4 kΩ) and emits a continuous beep tone
when the input voltage is below 50 mV (approximately 100 Ω).
Measurements are displayed as shown below:
– Measurement method: 0.5 mA ± 0.2% constant current source, open-circuit
voltage limited to < +9 V
– Response time: 70 samples per seconds with audible tone
– Gate time: 0.1 s or 1 period of the input signal, whichever is longer
– Input protection: 500 V RMS on all ranges
Reading rate Measurement display
Slow 1.2 V range
Medium 2.5 V range
Fast 4.0 V range
The measurement value will display OL (overload) when the voltage measured is
– > 1.2 V at slow reading rate
– > 2.5 V at medium reading rate
– > 4.0 V at fast reading rate
Disconnect circuit power and discharge all high-voltage capacitors before
testing diodes to avoid damaging the multimeter.
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