Making Preparations for Measurements
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IM DLM4038-03EN
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App
Index
2.4 Connecting Probes
WARNING
• Always turn off the power of the device under measurement before connecting the device
under measurement to the instrument. It is extremely dangerous to connect or disconnect
a measuring lead while the device under measurement is on.
• Do not apply an input voltage that exceeds the maximum input voltage, withstand voltage,
or allowable surge voltage.
• To avoid electric shock, be sure to ground the instrument, and connect the ground of the
probe and input connector to the ground of the item being measured.
• Avoid continuous connections in environments in which a voltage surge may occur.
• If over-range is indicated, the DLM4000 may be receiving a voltage higher than the
observed waveform or measured waveform values.* To prevent electric shock, change
the vertical scale with the SCALE knob so that the entire amplitude of the waveform is
displayed within the waveform display area, and check the input voltage level.
* If the input coupling is set to AC, the over-range indicator may not be displayed. For details, see
section 1.1, “Setting the Input Coupling,” in the user’s manual, IM DLM4038-02EN.
Over-range indication
CAUTION
• The probe interface terminals are located near the input terminals on this instrument. Do
not short the probe interface terminals. When you connect a probe, make sure to prevent
an excessive voltage caused by static electricity, etc., from being applied to the probe
interface terminal, as this may damage the terminal.
• The maximum input voltage for 1 MΩ input is 150 Vrms when the frequency is less than or
equal to 1 kHz. Applying a greater voltage may damage the input section. For frequencies
above 1 kHz, damage may occur even if the voltage is less than 150 Vrms.
• The maximum input voltage for 50 Ω input is 5 Vrms or 10 Vpeak. Applying a voltage
greater than either of these limits may damage the input section.
• For information about how to handle a probe, refer to the user’s manual that came with the
probe.
