Velleman DVM8264 Manual De Uso página 6

Some tips for measuring capacitance:
• The meter may take a few seconds to stabilize the reading. This is normal for high-capacitance measuring.
• To improve the accuracy of measurements less than 20nF, subtract the residual capacitance of the meter
and leads.
h. Transistor Measurement
To avoid electrical shock and/or damage to the instrument, do not apply more than 250VDC or
250VAC rms between the hFE terminal and the COM terminal.
To measure a transistor:
1. Set the rotary switch to hFE range.
2. Connect the COM and the "+" plug of the multi-function socket to the COM and hFE terminals.
3. Determine whether the transistor to be tested is NPN or PNP and locate the emitter, base and collector
leads.
4. Insert the leads of the transistor into the proper holes of the multi-function socket.
5. The meter will show the approximate hFE value at test condition of base current 10µ and Vce 2.8V.
i. Frequency Measurement
Do not measure the frequency on high voltage (>380V) to avoid electrical shock hazard and/or
damage to the instrument.
Frequency is the number of cycles a voltage or current signal completes each second.
To measure frequency:
1. Set the rotary switch to 20kHz range.
2. Connect the black and red test leads to the COM and Hz terminals respectively.
3. Connect the test leads to the circuit being measured.
4. Read the displayed value.
j. Temperature Measurement
To avoid electrical shock and/or damage to the instrument, do not apply more than 250VDC or
250VAC rms between the °C terminal and the COM terminal.
To avoid electrical shock, do not use this instrument when voltages at the measurement
surface exceed 60VDC or 24VAC rms.
To measure temperature:
1. Set the rotary switch to °C range. The LCD will show the current environment temperature.
2. Connect the COM plug and the "+" plug of the multi-function socket to the COM and hFE terminals.
3. Insert the "K" type thermocouples into the multi-function socket. Take care to observe the correct polarity.
4. Touch the object with the thermocouple probe for measurement.
5. Read the LCD.
k. Current Measurement
To avoid damage to the meter or injury in case of a fuse blow, never attempt an in-circuit
current measurement where the open-circuit potential to earth is higher than 250V.
To avoid damage to the meter, check the meter's fuse before proceeding. Use the proper
terminals, function and range for your measurement. Never place the test leads in parallel with
a circuit or component when the leads are plugged into the current terminals.
Current is the flow of electrons through a conductor. The meter's DC current ranges are 20mA, 200mA and 10A;
AC current ranges are 2mA, 200mA and 10A.
DVM8264
- 6 - VELLEMAN