FAQ 
  51 
FAQ 
●  I pressed the Power key on the front panel but nothing happens. 
● 
How can I get out of  Counter/Sweep/Modulation/TTL/−20dB mode? 
● 
The device accuracy does not match the specification. 
● 
What are these error messages? 
I pressed the Power key on the front panel but nothing happens. 
Make sure the AC source voltage setting on the rear 
panel is correct (page
21). Otherwise the internal fuse 
might be blown out. Contact the service personnel. 
How can I get out of Counter/Sweep/Modulation/TTL/−20dB mode? 
Press the Shift key, then the relevant numerical key. (Do 
the same action as you entered those modes) 
For example: To get out of  Counter mode, press Shift 
then 1. 
The device accuracy does not match the specification. 
Make sure the device is powered On for at least 30 
minutes, within +20°C~+30°C. This is necessary to 
stabilize the unit to match the specification. 
What are these error messages? 
Several messages appear when trying to set the frequency 
or duty cycle in forbidden way. Page
52 summarizes all 
the error message content. 
If  there is still a problem, please contact your local dealer or GWInstek at 
www.gwinstek.com.tw / marketing@goodwill.com.tw.
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