Datasheet
57
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. The upper
limit frequency of low-pass filter will be around 50kHz.
5.18 Input/Output Port
The output port is not allowed using as input s port, or the waveform generator will be
damaged. Clock Input port is isolated with case and other ports, also other ports such as
Output port, Sync Output Port, Modulate Input are isolated with case.
5.18.1 CHA output port
Locate in front panel and the signal of CHA output from this port. Press【Output】key
circularly to enable or disable the signal from CHA port. The indicator on the top of CHA
port light on or off to tell you whether the port is enable or disable.
5.18.2 CHB output port
Same as CHA port and won’t introduce in detail.
5.18.3 Synchronous output port
Locate at front panel. Press 【Utility】key then to 〖Sync On/Off〗softkey to enable or
disable the sync output. The indicator at top of port lights on if user enables the sync port.
The indicator light off if user disables the sync port.
The synchronous output signal is a pulse signal with TTL compatible. The characteristic
will be different under working mode changing, introduce as below,
(1) If select CHA under continuous mode, frequency of sync signal is same as signal
from CHA port, but phase lag to CHA’s. The phase difference can be set on phase
setting of CHA.
CHB under continuous mode is same as CHA.
(2) Under FM, AM, PM, PWM and Sum mode, the duty cycle of sync signal is 50%, the
frequency of sync signal is same as frequency of modulating waveform and the
phase of sync signal are relative with phase of modulating waveform.
(3) Under FSK, QFSK, 4FSK mode, the duty cycle of sync signal is 50%, frequency of
sync signal equals to hop rate. The sync signal is low level when outputting carrier
frequency and high level when outputting hop frequency.
(4) Under PSK, QPASK, 4PSK mode, the duty cycle of sync signal is 50%, frequency of
sync signal equals to hop rate. The sync signal is low level when outputting carrier
phase and high level when outputting hop phase.