Terminologies used in oscilloscope performance testing/calib

Hi,

I was wondering if anyone can help me either via explanation or by
referring me to a proper site to understand more about this issue :

1. What is the difference between the term frequency response and
bandwidth in term of testing/calibration oscilloscopes?

Some UUT manuals refer to the term as frequency response, whereas some
call it bandwidth. Is it the same thing? While the standard reference
manual call it frequency response.

2. What does it mean by pulse, rise time, trigger sensitivity? Do they
necessarily means the same thing?

I highly appreciate any helps or reference on this matter.

Thank you,
Nadhra

 

[Jim Yanik]

nadhra@gmail.com wrote in news:8ed8173d-b377-4e15-9036-
dc04694ec679@e25g2000prg.googlegroups.com:

Hi,

I was wondering if anyone can help me either via explanation or by
referring me to a proper site to understand more about this issue :

1. What is the difference between the term frequency response and
bandwidth in term of testing/calibration oscilloscopes?

No difference. BW= freq response.
typically spec'd for a -3db drop from reference amplitude.(Ref usually 5 or
6 major div ampl.) Ref frequency may be 50Khz,or IIRC,6 Mhz.(TEK SG503 or
SG504)
AC coupling low freq response has to be checked,too,using a LF signal
generator.

Some UUT manuals refer to the term as frequency response, whereas some
call it bandwidth. Is it the same thing? While the standard reference
manual call it frequency response.

2. What does it mean by pulse, rise time, trigger sensitivity? Do they
necessarily means the same thing?

"rise time" is the time in ns or us between the leading edge passing
through 10% amplitude and 90% amplitude points.
Usually,the graticule has markings to aid in this measurement.

"pulse" probably refers to aberrations on the front corner of a displayed
fast rise pulse(spikes,ringing).
typically spec'd as +/- X minor div for a Y amplitude display.
your generator has to have good specs on it's pulse aberrations for this
measurement.

"trigger sensitivity" is the displayed or input signal level where you can
achieve solid triggering,usually specified in mv or X minor divs of display
amplitude.There's internal trig sensitivity and external input trig
sensitivity.

For standards,you want at least 4 times better specs than the unit under
test.(UUT)

I highly appreciate any helps or reference on this matter.

Thank you,
Nadhra

--
Jim Yanik
jyanik
at
kua.net

 

[JeffM]

adhra@ gmail.com wrote:

I was wondering if anyone can help me

Don't do this.
http://groups.google.com/groups/search?enc_author=M1O_ORAAAABnT1vhuQ8rWr7g6JFl7Qu7&scoring=d&filter=0&num=100

If you MUST post the *same* question to MULTIPLE groups,
use this technique:
http://www.google.com/search?q=cache:qHhBKJ-sXKYJ:en.wikipedia.org/wiki/Cross-post+adequately.answered+corrected+with.commas+individually+Disclaimers+*-*-*-marked-as-Read-in-ALL-*-groups+Newsgroups.line