GW Instek SFG-830 User Manual - Manual (Page 37)

p. 34 SFG-830
(6) Checking the Harmonic Distortion
The deviation should be : Deviation Frequency
< -50dBC < 100kHz
< -40dBC 0.1 ~ 1MHz
< -30dBC 1 ~ 10MHz
< -25dBC 10 ~ 30MHz
n Set conditions:
Function : Sine Wave Amplitude : 1Vp-p
Frequency : 100Hz
o Use a distortion meter (DM-155A/B) with 50 ohm load to measure the output.
p Check and make sure that the output should be < -50dBC (0.31%).
q Set the Frequency to be 1kHz, 10kHz, 50kHz, and 100kHz in turn.
r Perform step p and q until the Frequency = 100kHz.
s Use a spectrum analyzer to measure the output.
t Check and make sure that the corresponding output to each Frequency setting
is in the range listed below:
Frequency Output
500kHz < -40dBC
5MHz < -30dBC
15MHz < -25dBC
30MHz < -25dBC
(7) Checking the Phase Noise
The deviation should be <-50dBC.
n Set conditions:
Function : Sine Wave Amplitude : 13dBm
Frequency : 10MHz
o Use a spectrum analyzer to measure the output.
p Check and make sure that the difference between the powers of 10MHz and
10MHz+15kHz is less than 50dBC.
(8) Checking the Rise Time of Squire Wave
The deviation should be : Rise Time < 15ns and Overshoot < 5% at full scale
output.
n Set conditions:
Function : Square Wave Amplitude : 10Vp-p
Frequency : 1MHz
o Use an oscilloscope with 50 ohm load to measure the output.
p Check and make sure that the Rise Time < 15ns and
the Overshoot / Undershoot < 500mVp-p.