Getting Started
18
P7380SMA 8 GHz Differential Probe Instruction Manual
6.
Press Autoset or adjust the oscilloscope to display a stable
calibration waveform. A stable square wave indicates that the
probe is functional on the 12.5X attenuation setting.
7.
The probe compensation signal amplitude and common mode
voltage is dependent on oscilloscope model. Check that the signal
amplitude on the oscilloscope and the common mode voltage
(displayed on the DMM) approximate those in the table:
P7380SMA Probe
@ 12.5X Attenuation
TDS6604
TDS7704
Signal amplitude
200 mV p-p
500 mV p-p
V
CM
900 mV
--250 mV
Refer to
Single-Ended Measurements
for more information on the
measured common mode input voltage.
This completes the 12.5X attenuation signal check. If you want to
check the 2.5X attenuation setting of the probe, do steps 8
through 11.
8.
Insert a 50
Ω
, 5X attenuator in-line with the probe compensation
output connector. The attenuator is necessary to bring the probe
compensation signal within the dynamic range of the probe at the
lower attenuation setting. Without this attenuator, the probe
amplifier in the 2.5X attenuator setting will be overdriven and the
display will show a limited DC level instead of the probe
compensation square wave.
You can use a BNC-style 5X attenuator, Tektronix part num-
ber 011-0060-03, or SMA-style 5X attenuator, Tektronix part
number 015-1002-01.
9.
Set the attenuation on the probe to 2.5X.
10.
Press Autoset or adjust the oscilloscope to display a stable
calibration waveform. A stable square wave indicates that the
probe is functional on the 2.5X attenuation setting.