Velleman DVM92 Notice page 5

3.6. Testing Diodes and Continuity
1. Connect the black test lead (-) to the "COM" jack and the red test lead (+) to the "V/Ω" jack.
2. Select the range with the FUNCTION switch and connect the test leads.
3. Connect the red test lead to the anode and the black test lead to the cathode of the diode to
be tested.
4. For continuity tests : connect the test leads to two random points of the circuit to be tested.
The incorporated buzzer is activated if the resistance between the two test leads is lower
than ± 50Ω.
3.7. Transistor Test (hFE)
1. Select the hFE-range with the FUNCTION switch.
2. Determine whether the transistor is of the NPN- or PNP-type and locate the emitter, the base
and the collector. Insert the leads into the proper holes in the socket on the front panel.
3. The display will show the approximate hFE-value at the moment of testing. Base current
10µA, Vce 2.8V.
4. Specifications
Maximum accuracy is guaranteed for a one-year period after calibration. Ideal circumstances
require a temperature of 23° C (± 5° C) and a max. re lative humidity of 75%.
4.1. General
Max. Voltage between Terminal and Earth
Display
Fuse Protection
Power Supply
Ranging Method
Polarity Indication
Overrange Indication
Battery-Low Indication
Operating Temperature
Storage Temperature
Dimensions
Weight
4.2. DC Voltage
Range
200mV
2V
20V
200V
1000V
Input Impedance
Overload Protection : 250Vrms for the 200mV-range and 1000V DC or peak AC for all other
DVM92
: 10MΩ for all ranges
ranges
1000VDC or 750Vrms AC (sine wave)
3 ½ digit LCD, 2 to 3 readings/sec.
200mA-range : F 0.2A/250V
20A-range
9V-battery
manual
" - " is displayed
" 1 . " is displayed automatically
" " is displayed
0° C to 40° C
-10° C to 50° C
85 x 165 x 32mm
250g (incl. battery)
Resolution
100µV
1mV
10mV
100mV
1V
5
: - - -
Accuracy
± 0.5% of rdg ± 1 digit
± 0.8% of rdg ± 2 digits
VELLEMAN