Agilent Technologies 1141A, Руководство пользователя и сервисное руководство

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36 1141A and 1142A User’s Guide
2 Calibrating the Probe
Bandwidth
Bandwidth
This test checks the high- frequency response of the 1141A
Differential Probe. The bandwidth of the oscilloscope is
characterized first so it is not a factor in the measurement. This
test depends on the accuracy of the termination on the test board
and the termination in the oscilloscope. Both should be with 1%.
Specification (–3 dB, dc coupled): . . . . . . . . . . . . . . . . . . . . . . . . . . . .dc to 200 MHz
1 With the N cable and N- to- BNC adapter, connect the signal
generator to the oscilloscope channel 1 input.
2
Set the signal generator for 200 MHz at 0 dBm (about 224 mVrms).
3
Set the 1142A front panel switches to Local and Zero offset.
4
On the oscilloscope press
AUTOSCALE
, then set the parameters listed
in Table 8 on page 36.
Table 7 Equipment Required
Equipment Required Critical Specifications Recommended
Model/Part
Oscilloscope 400 MHz bandwidth 54830A
Signal Generator 200 MHz at
≈
230 mVrms 8648A
Test Board No substitute 01141-66504
Cable Type N (m) 24-inch 11500B
Adapter Type N (f) to BNC (m) 1250-0077
Table 8 Oscilloscope Settings
Menu Selection Setting
TIMEBASE (time/div) 2 ns/div
CHAN 1 (sensitivity)
(input R) 100 mV/div
50
Ω
DC
ACQUISITION Sampling Mode
Memory Depth
Sample Rate
Averaging
# of avg Real Time
Automatic
Automatic
Enabled
32