Extech Instruments MA400 Instrukcja Obsługi Strona 11
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11 382860 Ver. 1.5 2/01
6.7 Capacitance Measurement
Attention: When shorting capacitors (discharging), high-energy discharge of
electricity may occur. Do not touch the terminals if there are capacitors with
voltages over 35 VDC or 25 VAC. Use special caution in environments where
flammable gases, steam or dust could trigger combustion
1. Discharge each capacitor before testing. Never attempt to measure the
capacitance of a charged capacitor, you might damage your multimeter.
2. Set the rotary function switch to the “CAP” position.
3. Capacitance measurements are only possible using the meter’s capacitor
input socket located to the upper left of the Rotary Switch.
4. Give the meter approx. 2-3 seconds to stabilize during capacitance
measurements. The left-most sub-LCD updates 1 second later than the Main
LCD, the center display 2 seconds later and the right sub-LCD 3 seconds
later.
6.8 Transistor Test
Attention: The transistor socket is not protected against overload. The
Warranty is void if external transistor sockets are built and used by the
operator.
To Check that a Transistor is working properly
1. Set the rotary function switch to hFE position.
2. Insert transistor in the appropriate transistor socket and read hFe on the LCD.
3. During measurements of small power transistors, the left-most sub-LCD
updates 1 second later than the Main LCD. The center display 2 seconds later
and the right 3 seconds later.
Important Transistor measurement notes:
• Observe the sequence of connections (E-B-C) for the transistor
• Some Darlingtons or special (power) transistors contain internal base-to-
emitter resistances that could cause erroneous measuring results.
• The hFE-measuring value is not an absolute measurement. It only indicates if
the transistor is operating or not. The true amplification of a transistor depends
on its operating current. This multimeter supplies a base current up to 10 uA;
the collector current is measured to calculate the respective hFE-value.
• It is not possible to measure transistors which are connected in a circuit.
• It is not possible to measure the hFE-value of FETs or other unipolar
transistors.
• If a low power transistor (e.g. BD 242 etc.) has terminals that do not fit the test
socket, do not force it into the test socket, as the meter terminals could be
damaged.
6.9 Temperature Measurement
The main display will show the temperature in degrees centigrade, while the middle
sub-display will show the temperature in degrees Fahrenheit
1. Select “TEMP” with the rotary function switch.
2. Insert in the temp probe into TEMP/CAP socket, observe the correct polarity
(narrow and wide tongue). Type K thermocouple probes are to be used
exclusively.
6.10 Logic Test This function allows logic level tests in digital circuits.
1. Switch the meter power ON.
2. Set the rotary switch to the “LOGIC” position. The LCD displays “rdy” (ready).
3. Connect the test-leads as follows: COM-input socket (black lead); V-Ohm
socket (red lead).
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