296 Appendix A Specifications
Dynamic Performance
100 mV, 1 V, 10 V Ranges; Aperture = 6 µs
Direct and Sub-sampled Digitizing (DSDC, DSAC, SSDC and SSAC Functions)
DC to 20 kHz Performance
0.02 % of Reading + Offset
2
Maximum Sample Rate
Dynamic Performance
100 mV, 1 V, 10 V Ranges; 50,000 Samples/sec
Test Input (2 x full scale pk-pk) Result
DFT-harmonics 1 kHz < –96 dB
DFT-spurious 1 kHz < –100 dB
Differential non-linearity dc < 0.003% of Range
Signal to Noise Ratio 1 kHz >96 dB
Range 1
Input
Impedance
Offset
Voltage
2
Typical
Bandwidth
10 mV 1 MW with 140 pF <50 µV 2 MHz
100 mV 1 MW with 140 pF <90 µV 12 MHz
1 V 1 MW with 140 pF <800 µV 12 MHz
10 V 1 MW with 140 pF <8 mV 12 MHz
100 V 1 MW with 140 pF <80 mV
12 MHz
3
1000 V 1 MW with 140 pF <800 mV
2 MHz
3
Function Readings / sec Resolution
SSDC, SSAC
100 M (effective)
4
16 bits
DSDC, DSAC 50 k 16 bits
Test Input (2 x full scale pk–pk) Result
DFT-harmonics 20 kHz <–90 dB
DFT-harmonics 1.005 MHz <–60 dB
DFT-spurious 20 kHz <–90 dB
Differential non-linearity 20 kHz <0.005 % of Range
Signal to Noise Ratio 20 kHz >66 dB
1. Maximum DC voltage limited
to
400 V DC in DSAC or SSAC
functions.
2. ±1°C and within 24 hours of
last ACAL ACV.
3. Limited to 1 x10
8
V-Hz
product.
4. Effective sample rate is
determined by the smallest
time increment used during
synchronous sub-sampling of
the repetitive input signal,
which is 10 ns.
5. <25 ns variability between
multiple 3458As
Sample Timebase
Accuracy: 0.01 %
Jitter: < 100 ps rms
External Trigger
Latency: < 125 ns
5
Jitter: < 2 ns rms
Level Trigger
Latency: < 700 ns
Jitter: < 100 ps, for 1 MHz
full scale input
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