Teledyne LeCroy PP066 - Manual (Page 8)

PP065/PP066 Passive Probe
6 922225-00 Rev A
Replacing the Attenuating Resistor (PP066)
The attenuation of the PP066 probe can be changed from ÷10 to ÷20 or visa
versa by changing the resistor inside the probe body. To change or replace the
resistor:
1. Remove the nose housing by rotating it counter clockwise and pulling it
away from the probe body taking care not to bend or twist the resistor
inside the housing.
2. Pull resistor straight out of the probe body without twisting or bending
the resistor.
3. Insert a different resistor by gently inserting one end of the resistor into
the probe body.
4. Install the nose housing by carefully sliding it over the resistor and
screwing it onto the probe body.
NOTE : The 450 Ω (÷10) resistor is directional. The dotted end of the resistor
needs to placed towards the probe side. The 950 Ω (÷20) resistor is not
directional. Two different Nose Housings have been supplied to indicate the
probe's attenuation: a black one to indicate a 450 Ω resistor for÷10 attenuation
and a blue one to indicate a 950 Ω resistor for ÷20 attenuation.
Oscilloscope Attenuation Setting
Because the PP066 and PP065 probes are not supplied with ProBus encoding,
you'll have to set the system's attenuation manually by entering the probe
attenuation on the (input) Channel setup dialog.
In addition, when using an oscilloscope capable of different input resistances, set
the resistance to 50 Ω by opening the channel’s vertical setup dialog and
selecting DC50 Ω from the Coupling pop-up selector.