Teledyne LeCroy DXC100A - Manual (Page 16)

DXC100A Differential Probe Pair
14 922259-00 Rev A
11. X100 LF CMRR
a. Continuing from the previous step, disconnect the probe from the pulse
generator.
b. Connect both probes to the pulse generator’s high amplitude output
using a 50 Ohm or (preferably) 75 Ohm termination, the BNC T, and two
BNC to probe tip adapters.
c. Press the –Input DC button.
d. Adjust C18 (-X100 LF1) and C12 (-X100 LF2) for minimum displayed
signal. Ignoring the first 1μs (0.1div), the residual displayed amplitude
should be less than 2mV (0.2div) peak to peak.
12. +Input X100 HF Transient Response
a. Press the –Input Off button.
b. Press the X10 Gain button.
c. Set BW Limit to Full. Set the oscilloscope to 20mV/div.
d. Connect the +probe to the pulse generator’s fast rise output using a 50
Ohm termination and the BNC to probe tip adaptor.
e. Press the VDiff button to enable VDiff mode.
f. Position the trace 2.5 divisions above the centerline using the PVG (-
00.500).
g. Press the +Input DC button.
h. Set the oscilloscope sweep speed to 10ns/div. Adjust pulse generator for
5 divisions of a 100 kHz signal.
i. Adjust R17 (X100 HF) for minimum aberrations at the top of the
waveform and a system rise time of less than 3.5ns.
13. X100 HF CMRR
a. Continuing from the previous step, disconnect the probe from the pulse
generator.
b. Connect both probes to the pulse generator’s fast rise output using a 50
Ohm termination, the BNC T, and two probe tips to BNC adapters.
c. Disable V
Diff
mode by pressing the V
Diff
button.