Specifications

5-10 Performance Tests
DS360 Ultra Low Distortion Function Generator
4. Amplitude
This test measures the amplitude accuracy of the DS360. For the sine, white noise and pink noise the
DVM will be used directly to measure the amplitude. The amplitude for balanced measurements is
defined as the voltage between the + and - BNC outputs. Due to the relatively slow rise time of the
squarewaves, the DVM cannot be used directly for higher frequency measurements. An initial
measurement of the squarewave is made at 100 Hz, where the rise and fall times are inconsequential to
the measurement. The amplitude is then measured using the scope to provide an accurate reference for
higher frequency measurements.
Setup
Connect the DS360 + BNC output to the DVM and the scope using a BNC tee. Set the DVM to Vrms,
with a long enough integration time to ensure 0.1% accuracy. Connect the DS360 SYNC OUT to the
DVM trigger input. Set the DVM to synchronous sub-sampled, external sync (for HP3458A).
Procedure
1) Reset the DS360 (Turn power off, wait 2 seconds, then turn power on w/ [CLR] pressed).
2) The sine amplitude accuracy is verified at 1.0 kHz and various amplitudes. For each amplitude,
perform steps 2b and 2c.
Voltage (Vrms) Voltage (Vrms)
14.0 0.4
12.0 0.04
10.0 0.004
7.0 0.00125
4.0
a) Press
[FREQ][1][kHz]
b) Press
[AMPL][amplitude]
c) Record the amplitude value from the DVM.
3) The balanced output amplitude is verified at 4 amplitudes. For each amplitude, perform steps 4c
and 4d.
Voltage (Vrms)
8.0
0.8
0.08
0.008
a) Connect the + (red) banana output to the + DVM input. Connect the - (white) banana output
to the DVM - input. Connect the common (black) banana to the DVM guard input (if available).