Velleman DVM4x00 Series, Руководство пользователя

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7.5 Capacitance measurements
Do not perform capacitance measurements on live circuits.
•
Connect the red test lead to the "VΩ Hz " jack and the black lead to the
"COM" jack.
•
Set the rotary switch to .
•
Press the RANGE button to manually select the range.
•
Connect the test probes to the capacitor and read its value from the display.
Notes:
o
It takes a few seconds before the meter shows the result. This is normal
behavior (e.g. 300.0µF range >30s).
o
To increase accuracy when measuring low capacitance values (<4nF), first hold
the tips of the measuring probes together to determine the capacitance value of
the test leads. Subtract this value from the measured value of the circuit.
o
Never perform capacitance measurements on a live circuit and make sure all
capacitors are completely depleted.
7.6 Frequency measurements
Do not perform frequency measurements in circuits with voltages >
1000V.
Always be careful when working with voltages above 60Vdc or 30Vac rms.
Keep your fingers behind the probe barriers at all times during
measurement. Do not touch unused terminals when the meter is linked to a
circuit which is being tested.
•
Connect the red test lead to the "VΩ Hz " jack and the black lead to the
"COM" jack.
•
Set the rotary switch to Hz.
• Press the RANGE button to manually select the range.
• Connect the test probes to the circuit and read the measured value from the LCD.
Notes:
o
The frequency can also be measured during AC voltage/current measurement.
Start the measurement and press the HZ % button to measure the frequency or
duty cycle.
o
Use a shielded cable for measuring small signals in a noisy environment.
7.7 Temperature measurements
Do not touch any live parts with the temperature measuring probe.
•
Set the rotary switch to the °C range. When no temperature measuring probe is
connected, the current environmental temperature is displayed.
• Place the adaptor socket between the “VΩ Hz ” and the “COM” jack (align “+”
with “VΩ Hz ”).
•
Plug the thermocouple (type K) into the adaptor socket (align “+” with “+”).
•
Hold the tip of the temperature probe against the object under test.
•
Read the temperature on the LCD.
7.8 Current Measurements
Do not measure current in circuits with voltages > 1000V
Current measuring jack µA/mA max. 600mA.
For currents up to 10A use the 10A jack.
Always be careful when working with voltages above 60Vdc or 30Vac rms.
Keep your fingers behind the probe barriers at all times during
measurement.