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User Calibrations
The following calibrations can be performed by the user:
Electrical channels have calibration procedures for:
The input circuits can be damaged by electrostatic discharge (ESD). Avoid
C A U T I O N
applying static discharges to the front panel input connectors. Before
connecting a coaxial cable to the connectors, momentarily short the center
and outer connectors of the cable together. Avoid touching the front panel
input connectors without rst touching the frame of the instrument. Be sure
the instrument is properly earth-grounded to prevent buildup of static charge.
An antistatic mat and wristband are strongly recommended.
Calibration
What is calibrated
Plug-in
Vertical o set and vertical
Vertical
scale accuracy.
Calibration
Dark
Dark calibration measures
Calibration
the channel o set signal
without any light present
and this value is used in
the extinction ratio
algorithm.
3-6
Plug-in Module Vertical Calibration
Dark Calibration
Probe Calibration
Channel Skew
External Scale
adjusting timebase skew, for matching propagation delay between channels,
probes, cables, and so forth
using external probes
Table 3-2. Electrical Channel User Calibration Summary
Measurements A ected
Any electrical vertical
measurements such as
V
, eye height,
p to p
extinction ratio
Channels a ected: electrical
with O/E converter. Extinction
ratio.
FINAL TRIM SIZE : 7.5 in x 9.0 in
Recommended Interval
Perform after any power cycle or
once every 10 hours during
continuous use or if operating
temperature changes by more
than 2
C.
Before extinction ratio
measurements if the vertical scale
or o set has changed since the
last dark calibration or after a
plug-in vertical calibration is
performed.
Key Path
Utility
4
5
FFFFFFFFFFFFFFFFFFFFFFFFFF
Calibrate
FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF
Calibrate Plug-in
,
Shift
Meas eye
4
5
4
5
FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF
Extinction ratio
FFFFFFFFFFFFFFFFFFFFFFFF
Dark Cal
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