Specification-2445A/2455A Service
Table 1-2 (cont)
Characteristics
DEFINITIONS
A Trigger Level Error = (A Trigger Level Readout Error)/SRA.
B Trigger Level Error
= (B Trigger Level Readout Error)/SR
8
•
trREF
= rise time, reference trigger signal.
trREL
T = rise time, delta trigger signal.
SRA
= slew rate at trigger point, A Sweep trigger signal
in
div/sec.
SR
8
= slew rate at trigger point, B Sweep trigger signal
in
div/sec.
SRREF
= slew rate at trigger point, reference trigger signal
in
div/sec.
SRoEL
T = slew rate at trigger point, delta trigger signal
in
div/sec.
T.IE
= trigger jitter error.
Performance Requirements
For delay or delta time, disregarding noise
in
the signal, this term contributes
<1
LSD if the slew rate
is
greater than
0.03 vertical div/ns or if the slew rate is greater than 30000 vertical div/horizontal div.
Trigger Jitter
= [(Reference Trigger Signal Jitter)² + (Delta Trigger Signal Jitter)²
+ (A Sweep Trigger Signal Jitter)²]^1/2
Reference Trigger Signal Jitter
= (ens +
enREF)/SRREF·
= 0 for Frequency mode.
ens
= scope noise in div.
= 0.05 div for
HF
REJ trigger coupling.
=
0.1
div for
DC
trigger coupling, 5
mV
to
5 V sensitivity.
= 0.15 div for
DC
trigger coupling, 2 mV sensitivity.
enREF
= reference signal rms noise in div.
Delta Trigger Signal Jitter
= (ens +
enoEL
T)/SRoEL
T·
= 0 for Frequency
or
Delay mode.
enoEL
T = delta signal rms noise in div.
A Trigger Signal Sweep Jitter = (ens +
enA)/SRA.
enA
= A sweep trigger signal rms noise
in
div.
When the Word Recognizer supplies a trigger in synchronous mode, the trigger jitter
of
the associated trigger signal
is
<1
ns;
in
asynchronous mode, the associated trigger signal jitter is
<20
ns.
N
= number
of
averages during measurement interval.
= see Table 1-3 for Delay or Delta Time.
= (measured frequency) x (measurement interval) for Frequency
or
Period.
Measurement Interval
= 0.5 s or
two
periods
of
measured signal, whichever is greater.
1-14
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