NF FRA5087, Instruction Manual

Page: 167 / 194

8.5 Performance test
FRA5087 8-9
8.5.7 Analyzer IMRR
IMRR at 60 Hz is tested.
a) Setting
FRA5087 oscillator FRA5087 analyzer
Frequency 60 Hz Integration 100 cycles
Output waveform Sinewave Measuring mode CH1, CH2
Output voltage Display mode X axis : logF
AC 10 Vpeak Y1 axis : dBR
DC bias 0 V Y2 axis : 
b)
Connection
FRA5087
BNC-BNC
coaxial cable
BNC T-type
divider
BNC-alligator clip
coaxial cable
BNC shorting
plug
OSC CH1 CH2
FRA5087
OSC CH1 CH2
CH1 IMRR measurement CH2 IMRR measurement
c)
Procedure
Set the analyzer mode as follows. Conduct Single measurement with FRA5087.
Read the dBR measuring results from the LCD screen.
Analyzer mode for CH1 IMRR measurement: CH2/CH1
Analyzer mode for CH2 IMRR measurement: CH1/CH2
d) Judgment
Connection Measured value Tolerance
CH1 (analyzer mode: CH2/CH1) dBR= dB More than 120 dB
CH2 (analyzer mode: CH1/CH2) dBR= dB More than 120 dB