Service - Keysight InfiniiMax III+ Series User Manual

Service

The following symptoms may indicate a problem with the probe or the way it is
used. The probe is a high frequency device with many critical relationships
between parts. For example, the frequency response of the amplifier on the hybrid
is trimmed to match the output coaxial cable. As a result, to return the probe to
optimum performance requires factory repair. If the probe is under warranty,
normal warranty services apply.
Probe calibration fails
Probe calibration failure with an oscilloscope is usually caused by improper setup.
If the calibration will not pass, check the following:
• Check that the probe passes a waveform with the correct amplitude.
• If the probe is powered by the oscilloscope, check that the offset is
• Be sure the oscilloscope passes calibration without the probe.
Incorrect pulse response (flatness)
If the probe's pulse response shows a top that is not flat, check for the following:
• Output of probe must be terminated into a proper 50W termination. If you are
• If the coax or coaxes of the probe head in use has excessive damage, then
• If the one of the components in the tip have been damaged there may be a
Incorrect input resistance
The input resistance is determined by the probe head in use. If the probe head is
defective, damaged, or has been exposed to excessive voltage, the input resistor
may be damaged. If this is the case, the probe head is no longer useful. A new
probe head will need to be obtained either through purchase or warranty return.
InfiniiMax III+ Series Probes User's Guide
approximately correct. The probe calibration cannot correct major failures.
using the probe with an Infiniium oscilloscope, this should not be a problem. If
you are using the probe with other test gear, insure the probe is terminated into
a low reflectivity 50W load (~ ±2%).
reflections may be seen within ~ 1 ns of the input edge. If you suspect a probe
head, swap it with another probe head and see if the non-flatness problem is
fixed.
frequency gain non-flatness at around 40 MHz. If you suspect a probe head,
swap it with another probe head and see if the non-flatness problem is fixed.
Using InfiniiMax III+ Series Probes
1
37