Tektronix TDS 500C, Performance Verification Manual

Page: 142 / 148

Typical Characteristics
2–26
TDS 500C, TDS 600B & TDS 700C Performance Verification and Specifications
Table 2–16: Typical characteristics — Signal acquisition system (cont.)
Name Description
Accuracy, Delta Time Measurement The limits are given in the following table for signals having amplitude greater than
5 divisions, reference level = 50%, filter set to (sinX/X), acquired at 5 mV/div or greater. For
the TDS 700C, pulse duration < 10 div. Channel skew not included.
For the Single Shot condition, 1.4
≤
T
r
/S
i
≤
4, where S
i
is the sample interval and T
r
is the
displayed rise time.
TDS 600B: For the averaged condition, 1.4
≤
T
r
/W
i
≤
40, where W
i
is the Waveform
Interval, as described elsewhere in these specifications.
TDS 600B: Extra error in the measurement will occur for two-channel measurements due
to channel-to-channel skew. This is described elsewhere in these specifications.
Time measurement accuracy
Conditions for accuracy listed at right
are: Single Shot or Sample mode (or
HiRes mode on the TDS 500C/700C),
with Full Bandwidth selected.
TDS 600B:
±
( (0.20
×
sample interval) + (100 ppm
×
| Reading |) + (0.05
×
W
i
) )
TDS 600B example: at 5 GS/s, 5 ns/div, measuring a 40 ns wide pulse, accuracy =
±
( 40
ps + 4 ps + 5 ps) =
±
49 ps.
TDS 500C/700C:
±
0.15 sample in (25 ppm
×
| Reading |) + t/div/1000
TDS 500C/700C example: at 4 Gs/s, accuracy = 37.5 ps
Conditions for accuracy listed at right
are:
≥
100 Averages, will Full Band-
width selected, and for TDS
500C/700C, repetitive mode.
TDS 600B:
±
( 10 ps + (100 ppm
×
| Reading |) + (0.25
×
W
i
) )
TDS 500C/700C: 20 ps + (25 ppm
×
| Reading |) + t/div/1000
Calculated Rise Time, TDS 600B
2
Volts/Div setting
620B & 644B
Rise time 680B & 684B
Rise time
10 mV/div – 1 V/div 900 ps 450 ps
5 mV/div – 9.95 mV/div 1 ns 600 ps
2 mV/div – 4.98 mV/div 1.5 ns 750 ps
1 mV/div – 1.99 mV/div 1.8 ns 900 ps
Calculated Rise Time,
TDS 500C/700C
2
Volts/Div setting
520C, 540C, 724C,
& 754C Rise time 784C
Rise time
10 mV/div – 1 V/div 800 ps 400 ps
5 mV/div – 9.95 mV/div 800 ps 530 ps
2 mV/div – 4.98 mV/div 800 ps 600 ps
1 mV/div – 1.99 mV/div 890 ps 800 ps
Effective Bits — TDS 600B Input frequency Effective bits
The chart on the right gives the typical
effective bits for a 9-division p-p
sine-wave input, 50 mV/div, 10 ns/div
(5 GS/s), with a record length of 1000
points
98 MHz
245 MHz
490 MHz
990 MHz
6.3 bits
6.0 bits
5.5 bits
5.2 bits (TDS 680B & 684B only)