Input Capacitance Measurement; Testing Overload Protection - Fluke 5520A Operator's Manual

8-47. 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 MΩ input impedance. Note that input capacitance testing
cannot be done with 50Ω 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 O to initiate the measurement.

8-48. Testing Overload Protection

This test checks the power handling capability of the 50Ω input
of your oscilloscope. Before proceeding, ensure that the power
rating of your oscilloscope can handle the voltages and
currents that this test can output. Failing to do so could
damage your oscilloscope.
Output @
SCOPE
f
You can press the MODE softkey to cycle through the functions in the order shown, or
you can press P to return directly to the OTHER modes menu.
Each option in the OVERLD menu is described below:
•
OUTPUT @ SCOPE Indicates the location of the output signal.
•
UUTTRIP Indicates test results. "NO" appears if the overload protection did not
trip within the selected time limit. A value in seconds appears (e.g. "4.1s") if the
overload protection has tripped within the time limit.
•
T LIMIT indicates the selected time limit for application of the output value. Press
this softkey to key in or edit a different time limit (1s to 60s allowed.)
•
OUT VAL Indicates the output voltage type. You can select DC or AC and a value
ranging from 5 V to 9 V (shown in Output Display). Key in or edit this value.
•
MODE Indicates you are in OVERLD (Overload) mode. Use the softkey to change
modes and open menus for other oscilloscope calibration modes.
Caution
UUTTRIP T LIMIT
in 4.1s 10s
f f
5520A-SC600 Option
Testing Overload Protection
OUT VAL MODE
DC overld
f f
DC volt
AC edge
levsine
marker
wavegen
video
pulse
meas Z
overld
8
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