Silverline 589681 - Digital Multimeter AC & DC Manual

Audible Continuity
Overload protection: 15 seconds maximum 220V rms

Transistor hFE test (0-1000)

Accuracy

Accuracy is specified for a period of one year after calibration and within temperature range 18° - 28°C with 80% max relative humidity

Assembly

1. Remove the two screws from the back of the multimeter
2. Take the back off and insert a 9V battery (Fig. 1)
   
3. Connect the battery - align the battery with the connector so that the terminals on the battery and the connector snap-fit together securely
4. Insert the battery into the compartment, replace the panel carefully and re-tighten the screws

Operating Notes

• If in doubt as to range required, select the highest range and then reduce it as necessary until satisfactory resolution is obtained
• If the figures '1' or '-1' are displayed, this indicates the reading is out of the set range

Voltage measurement

• Connect the red Positive Lead (1) to the VΩmA Jack (6)
• Connect the black Negative Lead (2) to the COM (Common) Jack (7)
• Rotate the Function Selector (4) to select the required voltage range in the correct DC or AC range
• Connect the test leads to the circuit being measured
• Turn on the power to the circuit being measured. The value of the voltage passing through the circuit should be displayed on the LCD Display (3), along with the polarity (if reversed only)

DC Current measurement

• For measurements up to 200mA: Connect the red Positive Lead (1) to the VΩmA Jack (6)
• For measurements above 200mA, up to max 5A: Connect the red Positive Lead (1) to the 5A Jack (5).
• Connect the black Negative Lead (2) to the COM (Common) Jack (7)
• Rotate the Function Selector (4) to select the required amperage range
• Open the circuit to be measured. Connect the test leads across the opening to create a bridge over the gap
• Switch on the power to the circuit to be measured; the value of the current passing through the circuit should be displayed on the LCD Display (3)

Resistance measurement

Note: If the resistance to be measured is part of a circuit, turn off and disconnect the power and discharge all capacitors before measurement.

• Connect the red Positive Lead (1) to the VΩmA Jack (6)
• Connect the black Negative Lead (2) to the COM (Common) Jack (7)
• Rotate the Function Selector (4) to select the required ohm range
• Connect the test leads to the circuit being measured
• The resistance value should now be displayed on the LCD Display (3)
  Note: While measuring resistance about 1MΩ and above, the meter may take a few seconds to stabilise. This is normal for high resistance readings.

Diode testing

• Connect the red Positive Lead (1) to the VΩmA Jack (6)
• Connect the black Negative Lead (2) to the COM (Common) Jack (7)
• Rotate the Function Selector (4) to the setting
• Connect the red test lead to the anode of the diode to be tested and the black test lead to the cathode of the diode
• The approx. forward voltage drop of the diode should be displayed on the LCD Display (3)
  Note: If the connection is reversed, only figure '1' will be displayed

Continuity testing

• Connect the red Positive Lead (1) to the VΩmA Jack (6)
• Connect the black Negative Lead (2) to the COM (Common) Jack (7)
• Rotate the Function Selector (4) to the setting
• Connect the test leads to the circuit being measured
• If continuity exists (i.e. resistance is less than approx. 50Ω), the built-in buzzer will sound

Transistor testing

• Rotate the Function Selector (4) to the 'hFE' position
• Determine whether transistor is NPN or PNP
• Locate the emitter, base and collector leads
• Insert the leads into the appropriate holes in the 'hFE' Socket (8): The left side of the socket is configured for PNP, the right side for NPN
• The approximate hFE value will be displayed on the LCD display at the testing condition of base current 10µA and Vce 3V

Test signal use

• Rotate the Function Selector (4) to the setting
• A test signal (50Hz) appears between VΩmA and COM jack, the output voltage is approx to 5V p-p with 50KΩ impedance

Storage and Maintenance

Ensure that the test leads are disconnected prior to storing or carrying out any maintenance on this tool

• Store the unit in a clean, dry environment within the temperature range -10°C to +50°C
• If the test leads are damaged in any way, replace them with new leads of the same type and specification
• When replacing internal fuses replace with exactly the same type as previously fitted (see 'Specification' and Fig. 1)
• If the unit malfunctions, have it serviced by a suitably qualified technician
• If you need to replace the battery, use method described in 'Assembly'

Contact

For technical or repair service advice, please contact the helpline on (+44) 1935 382 222.
Web: www.silverlinetools.com
UK Address: Toolstream Ltd., Boundary Way, Lufton Trading Estate, Yeovil, Somerset, BA22 8HZ, United Kingdom EU Address: Toolstream B.V., Holtum-Noordweg 11, Unit 4, 6121 RE Born, The Netherlands

Troubleshooting