Velleman HPS50 User Manual
Page 66
66
HPS50 PersonalScope
TM
Troubleshooting
The screen remains blank or there is no signal :
• No power supply
• Batteries are discharged
• Contrast adjustment is incorrect
• Press RESET for at least 10 seconds
REMARK: Temporarily remove the battery and adapter in
case RESET is not helping.
RMS readout is incorrect :
• Make sure that at least 1 and preferably even 2
periods are displayed.
• The battery is discharged.
No signal on the oscilloscope display :
• Time/div setting is in the wrong position. Try 1ms
or choose auto-setup mode.
• The unit is in the ‘hold’ position
• Trigger function is set in the “once” position
• The programmed trigger level is not reached
(choose “run” mode)
• Y position is wrong or need callibration, see page 30
• The input signal is too high, change the volt/div.
setting or choose auto-setup.
Incorrect frequency readout:
• An incorrect time/div. setting has been chosen.
(start at 250ns/div)
Voltage readout does not correspond with the
actual value :
• The measuring probe is in the X10 position
• The battery is discharged.
• The zero refrence is not set correctly for DC
measurements.
TROUBLESHOOTING