Ⅶ. Maintenance & Cleaning - Tenma 72-7910 Manual


The waveform refreshing is slow:
① Check if the Acquire mode is "Average" mode
② In "Average" mode, waveform refreshing is slow because it displays the average
value of the waveform to reduce the random noise in displayed signal.
③ Change to "Sample" mode or "Peak" mode for the desired display.

The waveform display do not smooth
① The horizontal time base division value may be too small, increase the horizontal
time base division to improve the waveform smoothness;
② If the display type is "Vector", the signal waveform may not be smooth between dots.
This can be improved by setting the display type to "Dot".
Ⅶ. Maintenance & Cleaning
A. General Maintenance
Please do not store or place the instrument at any places where the LCD of the instrument is
exposed to sunlight directly.
Warning: Please do not stain the oscilloscope or probe with spray, liquid or solvent to
avoid instrument or probe damage.
B. Cleaning
Check the instrument and probe frequently. Clean the surface of the instrument according to
the following steps:
1. Please wipe the instrument and probe surface with soft cloth. Pay attention not to scratch
the LCD screen.
2. Wipe the instrument with wet cloth without dripping after disconnecting the power
supply. Use gentle detergent or clear water to clean. Do not use any abrasive chemical agent
to avoid instrument or probe damage.
Warning: Please make sure that the oscilloscope is completely dry before powering on again to
avoid electrical short circuit or injury.
Model 72‐7610/72‐10510 User Manual
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