Tektronix P6209, Instruction Manual

Page: 59 / 75

Adjustments
46
P6209 4 GHz Probe Instruction Manual
Offset Scale
Use this procedure to adjust the offset scale of the probe. The offset
zero of the probe should be checked before making any adjustment
to the offset scale. Refer to Figure 17 on page 44 for the location of
the test points and adjustments.
1.
Connect the probe power cable to the oscilloscope.
2.
Set the oscilloscope trigger source to internal clock.
3.
Set the oscilloscope channel vertical offset to +2.5 V.
4.
Ground the probe tip by connecting the two KlipChip leads
together.
5.
Using the (--) lead of the DMM, probe the ground lug in the probe
compensation box.
6.
Using the (+) lead of the DMM, carefully probe pin 7 of J2 (white
wire) in the probe compensation box.
NOTE
. The offset voltage measured on pin 7 will be of opposite
polarity and approximately one fifth of the offset value displayed on
the oscilloscope.
7.
Adjust the oscilloscope offset so that pin 7 of J2 measures
--0.50 V on the DMM.
8.
Set the DC power supply to +2.5 V, as measured on the DMM.
9.
Connect the equipment as shown in Figure 19. Take care not to
disturb the offset level setting.
10.
Adjust the
Offset Scale
(R3) in the probe compensation box so
the output measures 0.000 V,
±
1 mV on the DMM.