Agilent Technologies 54830 Series, Руководство по обслуживанию

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Chapter 3: Testing Performance
To test input resistance
3–6
To test input resistance
This test checks the input resistance of the vertical inputs. A four-wire measurement is used to
accurately measure the 50
Ω and 1 M Ω inputs.
Specification: 1 M Ω ± 1% and 50 Ω ± 1.5%
Equipment Required
Procedure
1
Set up the multimeter to make a four-wire resistance measurement.
2
Assemble the test cables.
a Use the two BNC-to-banana adapters to connect one end of each BNC cable to the
four-wire resistance connections on the multimeter.
b Connect the free ends of the cables to the BNC tee.
See Figure 3-3.
Figure 3-3
Input Resistance Equipment Setup
3
Connect the male end of the BNC tee to the channel 1 input of the oscilloscope.
4
Press Default Setup to set the oscilloscope to default conditions.
5
Press the Input key for Channel 1 to select 1 M Ω , then 50 Ω , and verify resistance
readings of 1 M
Ω ±
10 k
Ω
and 50
Ω ±
0.50
Ω
respectively.
6
Record the readings in the Performance Test Record.
7
Repeat steps 3 through 6 on the remaining channels, and on the external trigger of the
54830B, 54833A, and 54833D.
Equipment Critical Specifications Recommended Model/Part
Digital Multimeter Measure resistance (4-wire) at better than
0.25% accuracy Agilent 34401A
Cables (2) BNC Agilent 10503A
Adapter BNC Tee (m)(f)(f) Agilent 1250-0781
Adapters (2) BNC (f) to dual banana (m) Agilent 1251-2277
To ohmmeter
4-wire inputs
To oscilloscope
channel input