General Information—2230 Service
Table 1-1 (cont)
Characteristics
Performance Requirements
REPETITIVE Store Mode
SAMPLE and AVERAGE
0.05 #is/div
Single Trace ALT
100 MHz (-3 dB)b 100 MHz (-3 dB)6
0.1 MS/div
100 MHz (-3 dB)a' b 50 MHz (—3 dB)a
0.2 MS/div to 2 fzs/div
(5% maximum amplitude uncertainty)
10 5
------------Hza
-------------
Hza
SEC/DIV SEC/DIV
ACCPEAK
0.05 MS/div to 5 s/div
Same as NON STORE Bandwidth.8
AVERAGE Mode
Sweep Limit
Adjustable from 1 to 2047 or NO LIMIT.
Weight of Last Acquisition >
1/2,1/4, 1/8, 1/16, 1/32,1/64,1/128, or 1/256 (MENU selections).8
AVERAGE mode default weight is 1/4.
Resolution
Assuming uncorrelated triggers and greater than 1 LSB of the 8-
bit acquisition of vertical signal noise; the averaging weight for the
first acquistion is 1, the averaging weight for the second acquisi
tion is 1/2 and for n acquisitions is 1/2"-1. The MENU selects
the least weight used. Maximum signal-to-noise improvement is
achieved after 2 x (weight factor) x (expected acquisitions to fill).8
Frequency Response
Frequency response of the AVERAGE Storage Mode is a function
of the number of triggered acquisitions added to the weighted
average.8
Time jitter of a signal with respect to the sample clock will pro
duce a low-pass filter characteristic of an averaged waveform.
NON STORE CHOP Mode Switching Rate
500 kHz ±30%.a
STORE Chop Rate
SAMPLE
50/(SEC/DIV) for sweep speeds from 5 s per division to and
including 10 ms per division.8
PEAK DETECT
25/(SEC/DIV) for sweep speeds from 5 s per division to and
including 20 i±s per division.8
5 >is/div through 0.05 /ts/div
No CHOP mode; acts as in ALT.8
A/D Converter Linearity Monotonic with no missing codes.8
STORE Mode Cross Talk
<2% measured in CHOP at 10 /is/div and 10 mV/div using a
100 kHz square wave signal vertically centered and the other
input coupling set to ground.
'Performance Requirement not checked in Service Manual.
bOne-hundred MHz bandwidth is derated for temperature outside 0*C to +3 5*C and at 2 mV per division as for NON STORE.
1-5
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