SC5 Signal Conversion
Performance Measurements
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60
Accuracy
The accuracy of the analog outputs can be deduced from the offset and gain error measurements. The result for
uncalibrated and calibrated outputs is summarized below:
Calibrated Accuracy error
Abs. Accuracy at 0 V Abs. accuracy at ±10 V
No
< ± 0.85‰ of setting ±550 µV < ±550 µV
< ±8.5 mV
Yes
< ± 0.72‰ of setting ±25 µV < ± 25 µV
< ±7.2 mV
Table 16: Accuracy of the analog outputs.
Resolution
The SC5 achieves a resolution of 22-bit by using the hrDAC™ algorithm, 2 bits more than the native resolution. The
following measurement shows a comparison between 20- and 22-bit operation. The measurement was done with
AO1 connected to a
National Instruments 4071
PXI digital multimeter operated in digitizer mode (6.5 digits) at 100
S/s. The following settings have been used for the measurement:
SC5
DMM
Measured output:
AO1
Mode of operation: Digitizer, DC Volts
Output amplitude: 250 µV to 2.25 mV Range:
100 mV
Resolution:
26 bit
Sample rate:
100 S/s
Figure 40: Voltage sweep of 2 mV with hrDAC off (20-bit resolution, upper curve) and hrDAC on (22-bit resolution, lower
curve). The curves have been offset for clarity. The inset shows a 100 µV region of the 22-bit measurement, making the
single 22-bit LSB steps visible.
O
ut
pu
tv
ol
ta
ge
[m
V
]
2.5
2.0
1.5
1.0
0.5
0 0
2
4
6
8
10
12
14
16
18
20
22
Time [s]
hrDAC™ OFF (20-bit)
hrDAC™ ON (22-bit)
O
utp
ut
(+
1
m
V)
[
μ
V
]
140
120
100
80
60
40
20
0
0
0.2
0.4
0.6
0.8
1.0
Time [s]
Summary of Contents for Nanonis SC5
Page 1: ...Signal Conversion SC5 User Manual November 2016 R6860...
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Page 5: ...SC5 Signal Conversion Conventions 5...
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Page 75: ...SC5 Signal Conversion Legal Information 75 Declaration of Conformity...
