GW Instek SFG-830 User Manual - Manual (Page 30)

SFG-830 p.27
7. Adjustment and Correction
7.1 Preparation
n Preheat the instrument for more than 30 minutes.
o The operation temperature should be 23
±5
o C, and the humidity should be
lower than PH80%.
p The voltage should be (a) ±15V±0.90V or (b) ±5V±0.25V.
q If the voltage is correct, then plug in Q2334, Q2520 and AD834.
r Press [ Shift ] [ 9 ] [ 8 ] [ 3 ] [ 0 ], then all the calibration values will be cleared.
7.2 Adjusting Clock
n Set Conditions:
Function : Sine Wave Amplitude : 5Vp-p
Modulation : OFF Frequency : 10MHz
o Use Counter to measure the output.
p Adjust X202 until the frequency reaches the range of 10MHz
±20Hz.
7.3 Adjusting the DC of Frequency Double
n Set Conditions:
Function : Sine Wave Amplitude : 10Vp-p
Frequency : 10kHz
o Use an oscilloscope at AC 100mV/DIV, 20us/DIV to measure U303 - Pin 1.
p Adjust SVR301 until a flat DC signal shows up.
7.4 Adjusting D/A Ref
n Set Conditions:
Function : Sine Wave Amplitude : 10Vp-p
Modulation : OFF Frequency : 1kHz
o Use an oscilloscope with 50 ohm load to measure the output.
p Adjust SVR201 until the output becomes symmetric sine waves.
7.5 Adjusting the Bandwidth
n Set conditions: Function : Square Wave Amplitude : 8Vp-p
Modulation : OFF Frequency : 10kHz
o Use DMM at DCV range to measure U601-Pin6, and adjust SVR601 until the
readout to be 0.0V.
p Set conditions :
Frequency : 100Hz
q Use an oscilloscope at 2V/DIV, 5ms/DIV, with 50 ohm load to measure the
output. Then adjust SVR604 until the output becomes flat square waves.
r Set condition : Frequency : 500kHz
s Use an oscilloscope at 2V/DIV, 1us/DIV, with 50 ohm load to measure the
output. Then adjust SVR602 until the output becomes flat square waves.
t Set condition :
Frequency : 500kHz
u Use an oscilloscope at 2V/DIV, 200ns/DIV with 50 ohm load to measure the
output. Then adjust SVC601 to get the shortest rise time and the overshoot be
<5%.