Tf-dsq probe calibration and deskew fixture – Teledyne LeCroy TF-DSQ User Manual
Page 15
TF-DSQ Probe Calibration and Deskew Fixture
TF-DSQ-OM-E RevC
15
Note: The Cal Skew Ref field (and others) shows EXT for External Trigger Input. This may also
be more aptly referred to as AUX for Auxiliary Input. This Probe Calibration dialog field could
also be a channel.
P
ROBE
C
HANNEL AND
T
YPE
I
DENTIFICATION
This area shows the type of probe connected to the channel. All other information shown in a
given row is associated with that probe.
F
ULL
C
ALIBRATION
B
UTTON
This button causes the oscilloscope to automatically perform a full DC and deskew calibration.
See details of
or
P
ROBE
DC
I
NFORMATION
This information shows the gain and offset applied to the probe. If the probe measures a voltage
of V, the new, calibrated voltage is:
Note that the offset is in Volts, and the gain is unitless.
The probe DC calibration information can be entered either manually or as the result of an
automatic calibration. In the case of automatic calibration, it can be part of the full calibration or
it can be a standalone DC calibration executed in
. When the DC calibration
information is a result of an automatic calibration utilizing the TF-DSQ fixture, the information
shown is the gain and offset utilized for the currently configured channel sensitivity
(volt/division setting; see details of
). In this case, when the channel sensitivity is
altered, notice that these values change. When the DC calibration information is entered
manually, it clears any automatic results and replaces them globally with the newly entered
values. This means that if new gain and offset numbers are entered manually, these values
apply across all oscilloscope sensitivity settings.
The gain is limited to between 0.8 and 1.2, but the offset is not limited.
Note: It is important to note that some passive probes, and any user-designed probes, do not
provide proper probe identification information to the oscilloscope. In these cases, the
oscilloscope may not be able to determine the proper attenuation values. In this situation, you
should make sure that the proper attenuation is entered in the channel "Vertical" setup dialog.
Furthermore, the gain entered should be the gain correction applied to the system with the
correctly entered attenuation.