Lecroy 93XXC-OM-E07 User Manual

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These enable selection of
displayed traces and
adjustment of vertical
sensitivity and offset.

75$&(212)) Pressing these buttons either

displays or switches off the
corresponding channel trace.
When a c hannel is switched
on, the OFFSET and
VOLTS/DIV controls will then
be attributed to this, the

active

channel models (
channel has its own set of
unique, dedicated controls.

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channel. On two-

right

), each

6(/(&7&+$11(/ On four-channel models

right

), these buttons are

(
used to attribute all the
vertical controls to one
channel, independent of
whether or not it is the
channel displayed. The
selected channel number
is highlighted in the
Acquisition Summ ary field

see previous chapter

(

2))6(7 — vertically positions the
active channel.

),1' — automatically adjusts

offset and volts/div to m atch
the active channel’s input
signal.

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92/76',9 — selects the vertical sensitivity factor either in a 1–2–5 sequence or

continuously (
acquisition offset can be chosen from the “SPECIAL MODES” menu.

9$5 — allows the user to determine whether the VOLTS/DIV k nob will

modify the vertical sensitivity in a continuous manner or in disc rete
1–2–5 steps.

The format of the vertic al sens itivity in the Acquisition Summ ar y field
(bottom left of screen) shows whether the VOLTS/DIV knob is
operating in

see VAR, below

continuous

or

). The effect of gain changes on the

stepping

mode.

&283/,1* — menu-entry button that accesses the “Coupling” m enus (

).

section

see next

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&RXSOLQJ0HQXV Press for access to selection of:

À Coupling and grounding of each input channel
À ECL or TTL gain, offset and coupling preset for the

channel shown

À Bandwidth limiter for all channels
À Probe attenuation of each input channel.

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Used to select the input channel’s coupling. If an overload is
detected, the instrument will automatically set the channel to the
grounded state: the menu can then be reset to the desired coupling.

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When NORMAL is highlighted, pressing the corresponding menu
button sets the offset, Volts/div, and input coupling to display ECL
signals. Press the button a second time and the settings for TTL
signals are given. And a third time r eturns the s ettings to those used
at the last manual setup of the channel.

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To turn the bandwidth limit “OFF” or “ON”. The bandwidth can be
reduced from 500 MHz or 1 GHz, to either 200 MHz or 25 MHz, or
30 MHz (–3dB), depending on the model (
Bandwidth limiting can be useful in reducing signal and system noise
or preventing high-frequency aliasing, reducing — for example —
any high-frequency signals that may cause aliasing in single-shot
applications.

see

Appendix A).

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This command is global and affects all input channels.

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Sets the probe attenuation factor related to the input channel (

following for probe details

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see

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3UREH&DOLEUDWLRQ To calibrate the probe supplied, connect it to one of the input

channels’ BNC connectors. Connect the probe’s grounding
alligator clip to the CAL BNC ground and touch the tip to the
inner conductor of the CAL BNC. The CAL signal is a 1 kHz
square wave, 1 V p-p.

Set the channel coupling to DC 1 MΩ, turn the trace ON and
push AUTO SETUP to set up the oscilloscope. If over- or
undershoot of the displayed signal occurs, the probe can be
adjusted by inserting the small screwdriver, supplied with the
probe package, into the trimmer on the probe’s barrel and turning
it clockwise or counter- clockwise to achieve the optimal s quare­wave contour.

0RUH2Q&RXSOLQJ In the AC position, signals are coupled capacitively, thus

blocking the input signal’s DC component and limiting the

signal frequencies below 10 Hz.
In the DC position, all signal frequency components are allowed

to pass through, and 1 MΩ or 50 Ω may be chosen as the input
impedance.

The maximum dissipation into 50 Ω is 0.5 W and inputs will
automatically be grounded whenever this is attained. An
overload message will be displayed in the Acquisition Summary

Field and “Grounded” will be indicated in the “Coupling” menu.
The overload condition is reset by removing the signal from the
input and again selecting the 50 Ω input impedance from the
menu.

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3UR%XV6\VWHP LeCroy’s ProBus system provides a complete measurement solution

from probe tip to osc illos c ope display. This intelligent interc onnec tion
between LeCroy oscilloscopes and a growing range of accessories
is achieved via a six-wire bus following Philips’ I

2

C protocol. It
provides major benefits over standard BNC or even probe-ring
connections:

À Autosensing the probe type, eliminating all the guesswork —

and the errors — from manually setting attenuation or
amplification factors, and ensuring proper input coupling.

À Transparent gain and offset control right from the front panel

— particularly useful for FET (

FET menus shown here

) and

current probes.

À Gain and offset correction factors are uploaded from the

ProBus EPROMS on FET probes and automatically
compensated to achieve fully calibrated measurements.

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Used to select the input channel’s coupling. If an overload is
detected, the instrument will automatically set the channel to the
grounded state: the menu can then be reset to the desired coupling.

9GLY2IIVHW

When NORMAL is highlighted, pressing the corresponding menu
button sets the offset, Volts/div, and input coupling to display ECL
signals. Press the button a second time and the settings for TTL
signals are given. And a third time r eturns the s ettings to those used
at the last manual setup of the channel.

*OREDO%:/

To turn the bandwidth limit “OFF” or “ON”. The bandwidth can be
reduced from 500 MHz or 1 GHz, to either 200 MHz or 25 MHz, or

see

30 MHz (–3dB), depending on the model (

Appendix A).
Bandwidth limiting can be useful in reducing signal and system noise
or preventing high-frequency aliasing, reducing — for example —
any high-frequency signals that may cause aliasing in single-shot
applications.

When a FET probe is used, “Probe sensed…”, automatically
appears to indicate settings. When other ProBus probes are
used, this is redefined.

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