Stanford Research Systems SIM983, Руководство по эксплуатации и обслуживанию

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4 – 6 Performance Verification
TDS 3034 28 Apr 2006 11:52:30
Figure 4.5: Response of the SIM983 to a 20 V
peak-peak step,
G
= +
1
.
00
,
V
ofs
=
0
.
000 V.
TDS 3034 28 Apr 2006 11:53:39
Figure 4.6: Response of the SIM983 to a 20 V
peak-peak step,
G
= +
0
.
10
,
V
ofs
=
0
.
000 V.
4.2.3 Slew rate
Slew rate information is contained within the large-input, large-
output step response (Figure 4.5).
2
After an initial delay, the output
rises from − 5
.
4 V to
+
5
.
2 V in 120 ns. The slew rate
SR
=
5
.
2 − ( − 5
.
4)
120 × 10
− 9
=
88 V
/µ
s
.
4.2.4 Total harmonic distortion
Figure 4.7 shows a distortion measurement made on the SR785
FFT Spectrum Analyzer.
4.3 Noise Characteristics
Figure 4.8 shows noise plots of the SIM983 up to f
=
100 kHz, mea-
sured with an SR785. Note the quite weak dependence of the input-
referenced noise on the gain for
| G | ≥ 1
.
Figure 4.9 shows the time
dependence of the output voltage of the SIM983. The 0.17 Hz single-
pole high-pass, and 10 Hz eighth-order low-pass filtering was pro-
vided by the SIM965 Analog Filter.
2
The small-input, large-output step response of Figure 4.4 is limited by
the 1.15 MHz bandwidth at
G
=
19
.
99
,
so no slew-rate limitation is evident.
SIM983 Scaling Amplifier