TFG6800 Series Function/Arbitrary Waveform Generator Users’ Guide
Suin Instruments Co., Ltd
68
with DC offset, select AC mode and set the trigger level to be 0. If frequency of measured signal is
lower than 1Hz or amplitude lower than 100mVpp, select DC mode and adjust trigger level
properly to get a better result.
3.18.5 Low-pass Filter
Press
〖
Filter On/Off
〗
softkey to turn on or off the low-pass filter.
When frequency of measured signal is less than 50kHz, and the signal contains high-frequency
noise, the low-pass filter should be turned on to filter the high-frequency noise for an accurate
result.
But when frequency of measured signal is more than 50kHz, and the amplitude is small, it will
attenuate the high-frequency signal and frequency testing value will be less than standard
frequency value of test signal even can’t get a result, low-pass filter should be turned off.
3.19 Channel Coupling
The channels of the instrument have identical characteristic, using channel coupling function can
easily change the parameter values of multiple channels. Channel coupling contains frequency
coupling and amplitude coupling.
3.19.1 Function selection
Press
【
Multiple Channels
】
key to enter channel coupling function.
3.19.2 Source channel and Target channel
Both CH1 and CH2 could be used as source channel or target channel, press
〖
Direction
soft key to switch.
3.19.3 Frequency Coupling
With frequency coupling function, generator can make frequency output of channels relates and
generates multiplied frequency or differenced frequency signal. Press
〖
FreqCpl
〗
soft key to set
the frequency coupling to ‘On’, and the frequency value between channels shall comply with the
following formula.
Target channel’s frequency= Source channel’s frequency×frequency ratio+ frequency difference
When using the frequency coupling function, if the frequency of the target channel exceeds the
frequency upper or lower limit, the instrument will set the frequency to the limit value and the
above formula is no longer applied to.