This digital multimeter is a compact, light tool - a bargain if you need something inexpensive and reliable. The heart of the instrument is the ICL7106 IC coupled with a large 3-1/2 digit, 7 segment, 0.5" high LCD display with a maximum reading of 1999. Includes 9V battery. The unit can measure DCV (0.1mV - 1000V), ACV (0.1V - 750V), DCA (0.1mA - 10A), Ohm (0.1O - 2Mohm) diode forward voltage drop and hFE for bipolar PNP and NPN transistors.
Measurement specifications:AC voltage measurement
- Connect the red lead to "VOmA" jack and the black test lead to the "COM" jack.
- Set the rotary switch at the desired V~ position.
- Connect the test leads across the source or load being you want to measure and read the voltage value on the LCD display.
DC voltage measurement
- Connect the red test lead to the "VOmA" jack and the black test lead to the "COM" jack.
- Set the rotary switch at the desired position. If the voltage to be measured is not known, set the range switch at the highest range position and then reduce it until a satisfactory resolution is obtained.
- Connect the test leads across the source or load being measured. Read the voltage value and polarity on the LCD display.
DC current measurement
- Connect the red test lead to the "VOmA" jack and the black lead to the "COM" jack. For measuring currents between 200mA and 10A, insert the red lead into the "10A” (unfused) jack.
- Set the rotary switch at desired position.
- Open the circuit in which the current is to be measured, and connect test leads in series with the circuit.
- Read the current value on the LCD display along with the polarity of red lead connection.
- Connect the red test lead to "VOmA" jack and the black lead to "COM" jack. The polarity of red lead is positive "+" in this mode.
- Set the rotary switch at desired range position.
- Connect the test leads across the resistance to be measured and read the LCD display.
If the resistor being measured is connected to a circuit, turn off power and discharge all capacitors before applying measurements!
Before attempting to insert transistors into the socket for testing, always be sure that test leads have been disconnected from any measurement circuits. Also, components should not be connected to the hFE socket when making voltage measurements with the test leads!
- Set the rotary switch to the "hFE" position.
- Determine whether the transistor under testing is NPN or PNP type and locate the emitter, base and collector leads.
- Insert the leads into the proper holes of the hFE socket on the front panel.
- The multimeter will show the approximate hFE value at the condition of base current 10µA and a Vce of 3V.
- Connect the red test lead to "VOmA" jack and the black lead to the "COM" jack. The polarity of red lead is positive "+".
- Set the rotary switch at the diode test position.
- Connect the red lead to the anode of the diode to be tested and the black lead to the cathode of the diode.
- The forward voltage drop of the diode will be displayed in mV. If the connection is reversed, only figure "1" should be displayed for a good diode.
- Battery and fuse replacement
If the sign "BAT" appears on the LCD display, it indicates that the battery is old and should be replaced. Loosen the screws on the back cover and open the case. Replace the exhausted battery with a new one of the same type (9V 6F22 or NEDA 1604). To replace the fuse it's easy and should be replaced with a battery of the same ratings (F250mA/250V).
The unit has a wide operating temperature: -20°C to 75°C (32°F to 104°F) and a storage temperature of: -10°C to 50°C (10°F to 122°F). The accuracy is guaranteed to stay in the following limits for 1 year, when used at 23°C ±5°C, less than 75% relative humidity: AC voltage
Frequency range: 45 Hz to 450 Hz. Response: Average responding, calibrated in RMS of a sine wave.
|200V||100mV||±1.2% of rdg ± 10 digits|
|750V||1V||±1.2% of rdg ± 10 digits|
some models have a maximum input voltage of only 600V AC with an overload protection of 600V DC or RMS AC for all ACV ranges.
|200mV||0.1mV||±0.5% of rdg ± 2 digits|
|2000mV||1mV||±0.5% of rdg ± 2 digits|
|20V||10mV||±0.5% of rdg ± 2 digits|
|200V||100mV||±0.5% of rdg ± 2 digits|
|1000V||1V||±0.8% of rdg ± 2 digits|
Input impedance: 1MO
Maximum input voltage: 1000V DC or 750V rms (200mV scale: 500V DC or 350V AC rms) Note: some models will have a maximum DC input voltage of only 600V with an overload protection of 250V RMS AC for the 200mV range and 600V DC or RMS AC for other ranges.
Overload protection: F250mA 250V fuse (10A range is unfused!).
|200µA||0.1µA||±1.0% of rdg ± 2 digits|
|2000µA||1µA||±1.0% of rdg ± 2 digits|
|20mA||0.01mA||±1.0% of rdg ± 2 digits|
|200mA||0.1mA||±1.5% of rdg ± 2 digits|
|10A||10mA||±3.0% of rdg ± 2 digits|
Maximum open circuit voltage: 3.2V
Overload protection: 250V rms. AC on all ranges.
|200O||0.1O||±0.8% of rdg ± 3 digits|
|2000O||1O||±0.8% of rdg ± 2 digits|
|20KO||10O||±0.8% of rdg ± 2 digits|
|200KO||100O||±0.8% of rdg ± 2 digits|
|2000KO||1KO||±1.0% of rdg ± 2 digits|
Diode aprox. testing voltage is 2.8V with a current of 1mA. The overload protection in the diode test mode is 250V RMS. AC.Over range indication:
figure "1" on the display.Size:
126 × 70 × 25 mmWeight: