Velleman DVM857, Руководство пользователя, Страница: 11 / 99

DVM857
V. 01
–
11/06/2020 11 ©Velleman nv
9.7 TRANSISTOR hFE
Test range: 0-1000
lb. = 10 µA, Vce = ± 3.0 V
10. Operation
10.1 DC VOLTAGE MEASUREMENT
Do not measure circuits that may contain voltages > 600 VDC or
> 600 VAC
Use extreme caution when measuring voltages higher than 60 VDC
or 30 VAC rms. Always place your fingers behind the protective
edges of the test probes while measuring!
1.
Set the rotary switch in the desired “ ”
position.
2. Connect the red test
lead to the “
V

hFEmA
”
jack and the black
lead to the “COM” jack.
3. Connect the test leads to the source being measured.
4. Read the voltage value and the polarity of the red test lead on the LCD
display.
Notes
•
If the range is not known beforehand, set the selector switch to a high
range and lower gradually.
•
An over-range is indicated by OL or -OL . Set to a higher range.
•
The maximum input current is 600 V rms.
10.2 AC VOLTAGE MEASUREMENT
Do not measure circuits that may contain voltages > 600 VDC or
> 600 VAC
Use extreme caution when measuring voltages higher than 60 VDC
or 30 VAC rms. Always place your fingers behind the protective
edges of the test probes while measuring!
1.
Set the rotary switch in the desired “ ”
position.
2. Connect the red test
lead to the “
V

hFEmA
”
jack and the black
lead to the “COM” jack.
3. Connect the test leads to the source being measured.
4. Read the voltage value and the polarity of the red test lead on the LCD
display.
Notes
•
See DC Voltage Measurement.