DVM890 GB
5
3.8. 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.
3.9. Measuring Temperature
1. Measure temperatures with the K-type thermocouple : select the "T" range with the
FUNCTION switch and insert the plug of the K-thermocouple in the green "K PROBE"
socket.
2. The ambient temperature will be displayed in °C if the "T" range is selected without
connecting the K-thermocouple.
Remark : Do not hesitate to push firmly in order to insert the temperature probe in the socket.
3.10. Measuring Frequency
1. Connect the black test lead (-) to the "COM" jack and the red test lead (+) to the "V
Ω
Hz"
jack.
2. Select the "KHz" range with the FUNCTION switch and connect the test leads to the source
or load to be tested.
Remarks :
v
Do not apply more than 220Vrms to the input.
v
Use shielded cable for measuring a weak signal in a noisy environment.
3.11. Automatic Power off
1. The device will be deactivated automatically when the FUNCTION and RANGE switch has
not been used for 15 minutes. This energy-saving feature extends the life of your battery.
2. The meter will be reactivated if the FUNCTION and RANGE switch is turned or if the power
switch is pressed again.
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 700Vrms 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
