Fluke 5820A, Operator'S Manual

Page: 91 / 272

Front Panel Operation
Measuring Input Impedance and Capacitance
4
4-33
If you select Capacitance measurement, the menu appears as follows:
SET
OFFSET
MEASURE
cap
MODE
meas Z
f f f f f
CLEAR
OFFSET
•
SET OFFSET With the cable disconnected at the oscilloscope but still connected at
the Calibrator, press to cancel the capacitance of the Calibrator. Press again to
CLEAR OFFSET and return to the capacitance reading.
•
NO OFFSET appears for res 50
Ω
and res 1M
Ω
and the softkey beeps.
Default Impedance Measurement range = 50 ohm.
4-47. Input Impedance Measurement
With Meas Z mode selected, perform the following procedure to measure the input
impedance of an oscilloscope:
1.
Use the MEASURE softkey to select “res 50
Ω
“ or “res 1M
Ω
“ termination.
2. Connect the calibrator to Channel 1 on the oscilloscope.
3. Press
l
to initiate the measurement.
4-48. Input Capacitance Measurement
With Meas Z mode selected, perform the following procedure to measure the input
capacitance of an oscilloscope:
1.
Set the oscilloscope for 1 M
Ω
input impedance. Note that input capacitance testing
cannot be done with 50
Ω
input impedance.
2. Use the MEASURE softkey to select “cap”.
3. With the output cable connected to the Calibrator but not connected to the
oscilloscope, press the SET OFFSET softkey to cancel stray capacitances.
4. Connect the output cable to Channel 1 on the oscilloscope.
5. Press
l
to initiate the measurement.