Vertical Performance Verification; To Test Input Impedance - Keysight Infiniium 9000 Series Service Manual

3
Testing Performance

Vertical Performance Verification

This section contains the following vertical performance verification:
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•
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To test input impedance

This test checks the input impedance of the vertical inputs. A four-wire
measurement is used to accurately measure the 50 Ω and 1 MΩ inputs.
Specification: 1 MΩ ±1% and 50 Ω ±2.5%
Equipment
Required
Equipment
Digital Multimeter
Cables (2)
Adapter
Adapters (2)
Procedure
1
2
26

"To test input impedance"

"Offset Accuracy Test"
"DC Gain Accuracy Test"
"Analog Bandwidth - Maximum Frequency Check"
"Time Scale Accuracy (TSA) Test"
Critical Specifications
Measure resistance (4-wire) at better than
±0.1% accuracy
BNC
BNC Tee (m)(f)(f)
BNC (f) to dual banana (m)
Set up the multimeter to make a four-wire resistance measurement.
Assemble the test cables:
Use the two BNC-to-banana adapters to connect one end of each BNC
a
cable to the four-wire resistance connections on the multimeter.
Connect the free ends of the cables to the BNC tee as shown here.
b
To oscilloscope
channel input
on page 26
on page 27
on page 35
on page 48
Infiniium 9000 Series Oscilloscopes Service Guide
on page 40
Recommended
Model/Part
Keysight 34401A
Keysight 10503A
Keysight 1250-0781
Keysight 1251-2277
To DMM 4-wire
inputs