NF FRA51602, Instruction Manual

Page: 240 / 286

8.5 Performance test
8-8
FRA 51602
8.5.4 Oscillator AC amplitude and frequency characteristics
This instrument: Set the frequency to 1 kHz and the AC amplitude to 100 mVpk.
Measuring instrument : Set the broadband digital multimeter to AC voltage mode (true RMS).
Connections : Connect the
OUTPUT OSC
connector of this instrument to the RF
voltmeter with a coaxial cable via a BNC feed-thru terminator.
Measurement method : Set the oscillating frequency of the instrument to 1 kHz, 100 kHz,
1 MHz, and 2 MHz, and read the AC voltage value from the RF voltmeter.
The amplitude-frequency characteristic referenced to the AC voltage
measurement at 1 kHz is calculated from the measured AC voltage with
the formula shown below.
(Vrms) kHz 1 at voltage AC M easured
(Vrms) frequency each at voltage AC M easured
log 20
(dB) stic characteri frequency - Amplitude
10
 
Set the AC amplitude of this instrument to 1 Vpk, and 10 Vpk, and obtain
the frequency-amplitude characteristic in the same way, with the AC
voltage measured at 1 kHz as the reference value.
Judgement
AC amplitude
setting
Frequency
setting
Measured AC
voltage
AC amplitude
frequency
characteristic Passing range
100 mVpk 1 kHz _ _ _. _ mVrms 0.00 dB (reference)
100 kHz _ _ _. _ mVrms _ _._ _ dB
−0.30 to +0.30 dB
1 MHz _ _ _. _ mVrms _ _._ dB
−1.0 to +1.0 dB
2 MHz _ _ _. _ mVrms _ _._ dB
−3.0 to +3.0 dB
1 Vpk 1 kHz _. _ _ _ Vrms 0.00 dB (Reference)
100 kHz _. _ _ _ Vrms _ _._ _ dB
−0.30 to +0.30 dB
1 MHz _. _ _ _ Vrms _ _._ dB
−1.0 to +1.0 dB
2 MHz _. _ _ _ Vrms _ _._ dB
−3.0 to +3.0 dB
10 Vpk 1 kHz _ _. _ _ Vrms 0.00 dB (Reference)
100 kHz _ _. _ _ Vrms _ _._ _ dB
−0.30 to +0.30 dB
1 MHz _ _. _ _ Vrms _ _._ dB
−1.0 to +1.0 dB
2 MHz _ _. _ _ Vrms _ _._ dB
−3.0 to +3.0 dB
FRA 51602
OSC CH1 CH2
RF Voltmeter
BNC-BNC coaxial cable
BNC 50
Ω
feed-thru terminator