Functions Menu; System Prompts; Troubleshooting - Tenma 72-2650 User Manual

Functions Menu

Acquisition mode
Cursor
Display format
Display type
Horizontal position
SEC/DIV
Trigger coupling
Trigger Holdoff
Trigger level
Trigger mode
Trigger source
Trigger inclination
Trigger type
Vertical bandwidth
VOLT/DIV
Vertical coupling

System prompts

• Adjustment at ultimate limit - this informs you that the control adjustment has
reached it's limit in the current status. No further adjustment is possible. When
the vertical deflection factor ON/OFF, time base ON/OFF, X shift, vertical shift and
trigger level adjustments have reached their ultimate limits, this prompt will appear.
• USB Drive Connected - after a USB drive is plugged in this prompt appears when
the connection is valid.
• USB Drive Disconnected - after a USB drive is unplugged from the oscilloscope
this prompt appears.
• Saving - when the oscilloscope is saving a waveform, this prompt will show on
screen. A progress bar appears at the bottom.
• Loading - when recalling a waveform, this prompt shows on screen. A progress bar
appears at the bottom.

Troubleshooting

• If the screen remains black after switching on check the power supply and mains
lead are connected and check the main supply is switched on.
• If no waveform is displayed after acquiring a signal, check the probe and signal
lead is properly connected to the BNC. Check that the object being measured is
generating signals.
• If the voltage amplitude value is 10 times larger than actual value, check the
channel attenuation factor corresponds with the probe attenuation.
• Unstable waveform displayed - check the trigger type (use edge for normal signals)
and also check the trigger source is the same as the signal input channel. Also
check trigger mode is set to normal or single and try changing the coupling display
to high or low frequency suppression.
Adjust to 'Sampling' or 'Peak Measurement'
Disabled
Set to YT
Vector
Adjusted
Adjust according to signal frequency
AC
Minimum value
Set at 50%
Auto
Set to CH1 but if there is no signal in CH1 and CH2 applies a
signal, it will be set to CH2
Rising
Edge
Full
Adjust according to amplitude of the signal
DC
23
Setup