Scientech 801C
Scientech Technologies Pvt. Ltd.
13
Type of Signal Voltage:
All signals whose frequency spectrum is below 30MHz can be displayed on the
Scientech 801C
.
Simple electrical processes such as sinusoidal RF and AF signals or 50Hz ripple
voltages are easily displayed by the instrument.
However to display square or pulse shaped signals one has to remember that their
harmonic content must also be transmitted along with the fundamental. Hence the
bandwidth of the vertical amplifier must be set considerably higher than the
repetition of logic and pulse signals, particularly, if the duty cycle permanently
changes during the operation. Otherwise, the display will move up and down
without any change.
Display of composite signals which do not contain any suitable level components
for triggering cause greater problems. To obtain a well triggered display in such
cases, it is necessary to use the time base 'Var' control.
To be used as an AC or DC voltage amplifier, each channel is provided with an
'AC-DC' switch. Under normal conditions AC mode is used. Use of DC mode is
recommended only when acquisition of the DC voltage content signal is
absolutely necessary. However, when investigating very low frequency pulses,
disturbing ramp offset may occur with AC coupling. In this case DC coupling
must be used DC voltages are always measured in the 'DC' position. DC operation
is to be recommended even for the representation of logic and pulse, particularly
under conditions when the duty cycle changes permanently during the operation,
else, the display will move up and down with change.
