Tenma 72-7630 - Operation; Accessing Signals; Probe Compensation; Autoset Waveform Display

4
Accessing signals
• Power on the unit then allow the self test to complete.
• Press UTILITY button then F1 and the screen will display DEFAULT SETUP.
Note: The meter has quad input channels plus one external trigger input channel.
• Press CH1 to enter channel 1 menu.
• Connect the probe to the Ch1 input.
• Set the probe attenuation switch to 10X position.
Note: The oscilloscope attenuation has to be set as well.
• Press F4 until 10X displays. This changes the vertical range multiple to ensure the
measurement result correctly reects the amplitude of the measured signal.
• Connect both probe and ground clamp to the corresponding signal terminals.
• Press AUTO and a square wave of about 3V at 1kHz is displayed for a moment.
• Press OFF then CH2 and repeat for channel 2.
OPERATION
AUTOSET WAVEFORM DISPLAY
Probe compensation
• Perform this adjustment when connecting the probes to any input channel for the
rst time or errors in the measurement may result.
• Connect the probe tip to the probe compensator’s signal output connector and
connect the ground clamp to the earth wire of the probe compensator.
• Enable CH1 and press AUTO.
• Observe the shape of the displayed waveform.
• Adjust the variable capacitor on the probe with an insulated screwdriver until a
correct waveform is achieved.
• The oscilloscope features an autoset function which automatically adjusts the
vertical deection factor, scanning time base and trigger mode based on the input
signal until the most appropriate waveform is displayed.
• This function only operates when the signal to be measured is 50Hz or above and
the duty ratio is larger than 1%.
Probe compensation