Tektronix TDS 420A, Service Manual

Page: 37 / 288

TDS 420A, TDS 430A & TDS 460A Service Manual
1- 15
Warranted Characteristics
This section lists the various warranted characteristics that describe the
TDS 400A Digitizing Oscilloscopes. Included are electrical and
environmental characteristics.
Warranted characteristics are described in terms of quantifiable performance
limits which are warranted. This section lists only warranted characteristics. A
list of
typical characteristics starts on page 1--23.
NOTE
. In these tables, those warranted characteristics that are checked in the
procedure Performance Tests , on page 4--15, appear in boldface type under the
column
Name
.
Performance Conditions
The electrical characteristics found in these tables of warranted characteristics
apply when the oscilloscope is adjusted at an ambient temperature between
+20
_
C and +30
_
C, has had a warm-up period of at least 20 minutes, and is
operating at an ambient temperature between 0
_
C and +50
_
C (unless
otherwise noted).
Table 1- 10: Warranted Characteristics — Signal Acquisition System
Name Description
Accuracy, DC Voltage Mea- Measurement Type DC Accuracy y, g
surement, Averaged
Average of
≥
16 waveforms
±
(1.5%
× |
(reading -- Net Offset
1
)| + Offset Ac
0.06 div
×
Vertical Scale)
Delta volts between any two
averages of
≥
16 waveforms
2
±
(1.5%
×
|reading| + 0.3 mV + 0.1 div
×
Vertical Scale)
Accuracy, DC Gain
3
±
1.5%
Accuracy, Offset Volts/Div Setting Offset Accuracy y,
1 mV/div--9.95 mV/div
±
(0.4%
×
|Net Offset
1
| + ( 0.9 mV + 0.1 div
×
Vertical Scale))
10 mV/div--99.5 mV/div
±
(0.4%
×
|Net Offset
1
| + (1.5 mV + 0.1 div
×
Vertical Scale))
100 mV/div--995 mV/div
±
(0.4%
×
|Net Offset
1
| + ( 15 mV + 0.1 div
×
Vertical Scale))
1 V/div--10 V/div
±
(0.4%
×
|Net Offset
1
| + (150 mV + 0.1 div
×
Vertical Scale)
Accuracy, Position
4
±
(1.5%
×
(Position
×
Volts/div) + Offset Ac 0.04 div)