Velleman DVM92 User Manual - page 5
DVM92 GB
4
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. relative humidity of 75%.
4.1. General
Max. Voltage between Terminal and Earth
1000VDC or 750Vrms AC (sine wave)
Display
3 ½ digit LCD, 2 to 3 readings/sec.
Fuse Protection
200mA-range : F 0.2A/250V
20A-range
: - - -
Power Supply
9V-battery
Ranging Method
manual
Polarity Indication
" - " is displayed
Overrange Indication
" 1 . " is displayed automatically
Battery-Low Indication
"
" is displayed
Operating Temperature
0°C to 40°C
Storage Temperature
-10°C to 50°C
Dimensions
85 x 165 x 32mm
Weight
250g (incl. battery)
4.2. DC Voltage
Range Resolution
Accuracy
200mV 100µV
2V 1mV
20V 10mV
200V 100mV
±
0.5% of rdg
±
1 digit
1000V 1V
±
0.8% of rdg
±
2 digits
Input Impedance
: 10M
Ω
for all ranges
Overload Protection : 250Vrms for the 200mV-range and 1000V DC or peak AC for all other
ranges