Tektronix DC 5010 Anleitung Seite 26

Specification-DC 501 0
Table 1-1 (cont)
Characteristics Performance Requirements Supplemental Information
--
Resolution and Accuracy
Definitions
Trigger Jitter Error (seconds rms)
=
where ("nl)
=
d(enl
)2
+
(en2)2 Volts rms
[Input slew rate at trigger point1 (voltslsec)
140 pV rms typical counter input noise for 1 MQ filter on; 240 pV rms typical
for 1 MQ filter off; 340 pV rms typical for 50
Q.
V rms noise voltage of users input signal at trigger point, measured with the
appropriate bandwidth.
Note: Best usable resolution is
+
1 psec in Time Interval (TI) modes.
*trigger level error (Volts)
Slew Rate Error (seconds)
=
I
lnput slew rate at trigger point
I
(volts/sec)
*Trigger level error
=
Alll functions pos slope trigger accuracy times attenua.tion factor
except WIDTH A
and EVENTS B
DUR A neg slope (trigger accuracy
+
10 mV) tim~es
attenuation factor
WIDTH A,
n
start edge trigger accuracy times attenuation
stop edge factor (trigger accuracy
+
hyst)
times attenuation factor
l ~ - start edge (trigger accuracy
+
hyst) times
attenuation factor
stop edge
trigger accuracy times attenuation factor
EVENTS B
Same as WIDTH A, except each number is rriultiplied by
DUR A
Freq B
Note:
Trigger Accuracy, (see CHANNEL A and CHANNEL B
INPUTS)
lnput hysteresis is typically 50 mV p-p times attenuation,
maximum 70 mV p-p times attenuation.
Internal slew rate
=
800 ps (50 Q)
1.3 nsec (1 MQ)
18 nsec (20 MHz filter)
N
=
Number of Averages
The minimum number of averages is selected by the AVERAGES button and the 69
buttons in decade steps from 1 to
10' . At Channel A repetition rates above approximately 250 Hz the actual number of averages will be:
N
=
[FREQ A (Hz)
x
4 msec]
+
AVGS
N
=
AVGS setting (below 250 Hz)
This typically leads to better than expected resolution in the displayed answer for small N with only minimal impact on
measurement time. Arming must be used when measuring only one event out of a pulse train (multiple events) with signals
a250 Hz.
-
REV MAY 1982