SC5 Signal Conversion Performance Measurements
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Analog outputs AC performance measurements
Frequency response
The frequency response of the analog outputs is measured with AO1 of the SC5 connected directly to a National
Instruments 4071 PXI digital multimeter operated in DMM mode, which has an analog bandwidth of 300 kHz.
The following settings were used for the measurement:
DMM
Measured output: AO1 Mode of operation: DMM, AC volts
Output amplitude: 1 V Range: 5 V
Output waveform: Sine wave Resolution: 22 bit
Figure 43: Frequency response of the SC5 analog outputs from 10 Hz to 100 kHz.
Output to input transfer function
The transfer function from output to input takes into account both the output and input filters, as well as all delays
due to data processing in the digital domain. It is of relevance when using e.g. the lock-in module or PI controllers. It
is measured with a short BNC cable connected between AO1 and AI1, and with a signal amplitude of 1 V. The
following figure shows amplitude and phase between 10 mHz and 100 kHz. The total phaseshift reaches 90° at a
frequency of 9.5 kHz (14.5 kHz) and 180° at a frequency of 18.5 kHz (26 kHz), values in brackets are for the analog
circuits only.
10
1
10
2
10
3
10
4
10
5
10
−3
10
−2
10
−1
10
0
10
1
Outpu
t voltage [V]
Frequency [Hz]
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