NF FRA5087 - Oscillator Output Amplitude Accuracy

8.5 Performance test
FRA5087
8-6
8.5.4 Oscillator output amplitude accuracy
The oscillator output amplitude and frequency response are tested.
a) Setting
FRA5087 Multi-meter
Output waveform sinusoidal wave Measurement mode AC voltage
Output voltage (True RMS)
AC 10 Vpeak
DC bias 0 V
b) Connection
FRA5087
Multi-meter
BNC-BNC
Coaxial cable
OSC CH1 CH2
c) Procedure
Set the oscillator frequency as follows and read the multi-meter indications. Use a
wideband multi-meter for frequencies above 100 kHz.
Oscillator frequency: 1 kHz, 100 kHz, 1 MHz, 10 MHz
Derive the amplitude from the multi-meter indication by the following formula.
[Amplitude accuracy (dB) = 20×log10[multi-meter indication (Vrms)] - 16.9897
d) Judgment
Oscillator frequency
Multi-meter
Amplitude accuracy
Tolerance range
1 kHz
Vrms
dB
-0.3 – +0.30 dB
100 kHz
Vrms
dB
-0.3 – +0.30 dB
1 MHz
Vrms
dB
-1.00 – +1.00 dB
10 MHz
Vrms
dB
-3.00 – +3.00 dB