User Manual
17
C. Probe Bandwidth
1.
Disconnect the probe from the mini hooks and the ProBus extender
and connect it to oscilloscope channel 1.
2.
Set the RF signal generator to 1.5 GHz for ZD1500, 1 GHz for ZD1000,
or 500 MHz for ZD500 at +6 dBm output.
3.
Using the square-pin microstrip path, connect the PCF200 to the
oscilloscope C2 input using an SMA-BNC adapter. Connect the signal
generator to the C2 input through the PCF200.
4.
Attach the probe to the PCF200 by seating the amplifier over the
square pins.
5.
Set up the oscilloscope as follows:
a.
C1 and C2 Vertical Scale 200 mV/div
b.
C2 Coupling DC50Ω and Bandwidth Full
c.
Horizontal Scale (timebase) 10 ns/div
d.
Trigger on C2 Edge, Level = 0 V
e.
Measurements:
i.
P1 sdev of C1
ii.
P2 sdev of C2
iii.
P3 ratio of P1/P2
iv.
P4 freq of C2
The probe bandwidth is defined as the frequency at which the probe
amplitude is 3 dB down from the input signal amplitude. This would be
the frequency at which the ratio measurement P3 drops to 0.7071.
6.
Record the signal loss ratio (P3) with RF signal input and verify is it
greater than 0.7071.
This completes the Performance Verification of the ZD series probe. Complete
and file the Test Record as required to support your internal calibration
procedure.
Apply suitable calibration label to the probe housing as required.