Tektronix TDS 420A, Руководство по обслуживанию, Страница: 39 / 288

Warranted Characteristics
TDS 420A, TDS 430A & TDS 460A Service Manual
1- 17
Table 1- 10: Warranted Characteristics — Signal Acquisition System (Cont.)
Name Description
Lower Frequency Limit, AC
Coupled
≤
10 Hz when AC--1 M
Ω
coupled;
≤
200 kHz when AC-50
Ω
coupled
6
1
Net Offset = Offset - (Position
×
Volts/Div). Net Offset is the voltage level at the center of the A-D converter dynamic
range. Offset Accuracy is the accuracy of this voltage level.
2
The samples must be acquired under the same setup and ambient conditions.
3
DC Gain Accuracy is confirmed in the Performance Verification Procedure by passing the checks for Offset Accuracy and
DC Voltage Measurement Accuracy (Averaged).
4
Position Accuracy is confirmed in the Performance Verification Procedure by passing the checks for Offset Accuracy and
DC Voltage Measurement Accuracy (Averaged).
5
The limits given are for the ambient temperature range of 0
_
C to +30
_
C. Reduce the upper bandwidth frequencies by
2.5 MHz for each
_
C above +30
_
C.
6
The AC Coupled Lower Frequency Limits are reduced by a factor of 10 when 10X, passive probes are used.
Table 1- 11: Warranted Characteristics — Time Base System
Name Description
Accuracy, Long Term Sample Rate and
Delay Time
±
150 ppm over any
≥
1 ms interval
Accuracy, Absolute Time and Delay Time
Measurements
1,2
For single-shot acquisitions using sample or high-resolution acquisition modes and a
bandwidth limit setting of 100 MHz:
±
(1 WI + 150 ppm of |Reading| + 450 ps)
For single-shot acquisitions using sample or high-resolution acquisition modes and a
bandwidth limit setting of 20 MHz:
±
(1 WI + 150 ppm of |Reading| + 1.3 ns)
For repetitive acquisitions using average acquisition mode with
≥
8 averages and a
bandwidth limit setting of FULL:
±
(1 WI + 150 ppm of |Reading| + 200 ps)
Accuracy, Delta Time
Measurement
1, 2
For single-shot acquisitions using sample or high-resolution acquisition modes and a
bandwidth limit setting of 100 MHz:
±
(1 WI + 150 ppm of |Reading| + 650 ps)
For repetitive acquisitions using average acquisition mode with
≥
8 averages and a
bandwidth limit setting of FULL:
±
(1 WI + 150 ppm of |Reading| + 300 ps)
1
For input signals
≥
5 divisions in amplitude and a slew rate of
≥
2.0 divisions/ns at the delta time measurement
points. Signal must have been acquired at a volts/division setting
≥
5 mV/division and not in Events mode.
2
The WI (waveform interval) is the time between the samples in the waveform record. Also, see the footnotes for
Sample Rate Range and Equivalent Time or Interpolated Waveform Rates in Table 1 - 4 on page 1 - 9.