User manual

72-9355 / 72-9360 / 72-9365 / User Manual

Chapter 4 ⎯ System Prompts and Trouble-shooting

1. Definitions of System Prompts

Adjustment at Ultimate Limit: This informs you that the multifunction control knob has

reached its adjustment limit in the current status. No further adjust is possible. When the

vertical deflection factor switch, time base switch, X shift, vertical shift and trigger level

adjustments have reached their ultimate limits, this prompt will appear.

USB Device Installed: After a USB device is plugged into the oscilloscope, this prompt

appears when the connection is valid.

USB Device Unplugged: After a USB key is unplugged from the oscilloscope, this

prompt appears.

Saving...... : When the oscilloscope is saving a waveform, this prompt is shown on the

screen. A progress bar appears at the bottom.

Loading...... : During waveform recall, this prompt is shown on the screen. A progress bar

appears at the bottom.

Function Disabled: This prompt appears when [ZOOM] is pressed at 5ns-100ns time

base.

2. Troubleshooting

1. If the screen of your oscilloscope remains black without any display after powering

on, follow the steps below to find the cause:

c Check if the power switch is properly pressed.

d Plug in the DC power adaptor and check if the battery is out.

e Check the power cable connection.

f Restart the unit after performing the above checks.

2. If no waveform is displayed after you have acquired a signal, follow the steps below

to find the cause:

c Check whether the probe is properly connected to the signal lead.

d Check whether the signal lead is properly connected to the BNC (channel

adaptor).

e Check whether the probe is connected properly to the object to be measured.

f Check whether the object for measurement is generating signals (connect the

channel with signals to the questionable channel to find the cause).

3. The measurement voltage amplitude value is 10 times larger or smaller than the

actual value:

c Check if the channel attenuation factor corresponds with the probe attenuation

you have chosen.

4. There is waveform display but it is not stable:

c Check the trigger source setup in the trigger menu. See whether it is the same as

the actual signal input channel.

“If the unit still fails to power on, contact your Tenma dealer to request service.”