Measurement Procedure; Measuring Resonant Frequency (Fr) - HP E4915A User Manual

Note
Note
Use the capacitance with the similar capacitance value to the target
capacitance to the ir fixture practically. When the actual capacitance
is set to be greatly different from the target capacitance, measurement
result fluctuates because of the internal calculation result.
The DUT's Q and other factors influence the unstability of the
measurement results.
When Capacitive Load Is Not Connected
Select No-CL for each of the actual and target load capacitance.
1. Press
(cl Value)
to select No-CL from the menu shown below.
CL TGT: No-CL User =CLact
2. Sequentially press CL_a:nimnn pF and
([(Upper select)])
to select
No-CL from the menu shown below.
CL ACT: No-CL User
Measurement Procedure
Make sure that both of the CL adapter boards are connected to the
HP 41902A.
The HP E4915A/E4916A searches for and displays characteristics of
a crystal resonator (DUT) such as Fr immediately when the DUT is
connected to the fixture. Search Fail appears on the LCD when no
DUT is connected to the fixture.
Note Be sure to connect a capacitive load to the CL adapter board before
mounting this board onto the HP 41902A with the surface marked
with CL facing up.
The CL adapter board with a capacitive load must be mounted with
the surface marked with CL facing up. The board with no load must
be mounted with the surface marked with THRU facing up.
Even if you use no capacitive load, be sure connect both adapter
boards to the HP 41902A with the surface marked with THRU facing
up.
The HP 41902A cannot make measurement without CL adapter
boards. Also, mounting one or both boards with the surface
marked with CL facing up causes the circuit to become open. DUT
characteristics cannot be measured if the circuit is open.
Measuring Resonant Frequency (Fr)
Although a load is actually connected, the HP E4915A/E4916A
calculates and displays the DUT resonant frequency with no load.
1. Press
(Meas Prmtrj
to check that Fr appears as the parameter. Select
Fr as the parameter if it does not appear on the LCD. Then,
sequentially press
[(blue)!
and
(Bk Sp (Entry
ofpl.
2. Fr and Cl values are displayed immediately when a DUT is
connected to the HP 41902A.
Applications 5-5