GW Instek SFG-830 User Manual - Manual (Page 31)

p. 28 SFG-830
7.6 Adjusting the Filter
n Press [Shift] + [DEFAU] keys
o Set conditions:
Function : ARB Amplitude : 8Vp-p
Frequency : 2MHz (sampling frequency)
p Use a oscilloscope at 2V/DIV, 200ns/DIV with 50 ohm load to measure the
output.
q Adjust SVC301, 302, 303, and 304 in turn to get the shortest rise time and the
smallest peak to peak ripple.
r Repeat steps n~q once.
7.7 Adjusting Harmonic Distortion
n Set conditions: Function : Sine Wave Amplitude : 8Vp-p
Frequency : 15kHz
o Use a spectrum analyzer with 50 ohm load, start frequency at 0Hz and stop
frequency at 15kHz, to measure the output.
p Adjust SVR501 until get the smallest second harmonic (20kHz).
q Repeat step n and o.
r Adjust SVR603 until third harmonic (45kHz) and fifth harmonic (75kHz)
achieve the same level.
NOTE : When use software in calibrating , these steps should be gone through after Callier Null
calibration. Meanwhile, adjust SVR501 and SVR603 to minimize distortion.
7.8 Calibrating by Software
(A) Calling Default Calibration Data
n Press [Shift], [9], [8],[3], [0] keys.
ª The display will indicate “default” for a few seconds, then shows 1000.00Hz.
The calling of default calibration data is then finished.
(B) Manual Calibration
Basic Steps :
n Press [Shift], [0], [8], [3], [0] keys to shift to the manual calibration mode.
ª The display will indicate “CAL EDIT” for a few seconds, then shows 00001
(blinking) and 1000. The figures on the left side represent the Calibration
Number, and the right-hand figures are the corresponding Calibration Value.
The blinking area is where you can input figures, and can be switched by
pressing the [ ] and [ ] keys in FUNCTION column.