9-2 Section 9: Verifying the Model 9500B Accuracy Specification
Final Width = 215mm
9.8.1.1 Summary
Equipment requirements are given at para 9.8.1.2 and test
interconnections at para 9.8.1.3.
The DC Function is verified by carrying out measurements of amplitude
in the sequence given at para 9.8.1.4, at the verification points shown
in Tables 9.8.1.1 and 9.8.1.2.
9.8.1.2 Equipment Requirements
• The UUT Model 9500B Mainframe, with 9510 or 9530 Active
Head.
• A high resolution Standards DMM with DC Voltage accuracy of
±0.005% or better, from 1mV to 200V.
Example: Model 1281 Digital Multimeter.
• An adaptor to convert from BNC to 4mm leads.
Example: Model 4955 Calibration Adaptor.
• Short, high-quality 4mm leads.
This section recommends a set of verification points.
9.6 Specification Limits
For each chosen verification point it will be necessary to know absolute
measurement limits which can be used to judge whether or not the
9500B is performing within its specification. As mentioned earlier, the
accuracy specifications detailed in Section 7 of this handbook are
absolute accuracies which incorporate all the uncertainties involved in
calibrating the 9500B up to and including those of National Standards.
9.7 Verification Procedure
Suitability
The procedures given in this section to verify the Model 9500B
specification are suitable for verification both after receipt from the
factory, or when associated with user-calibration.
Traceability
Where, to conform to quality standards, the 9500B is required to be
traceable to higher standards; then all equipment used to verify the
9500B specification must also be traceable to those standards.
9.8 9500B Mainframe Verification by
Functions
Sub-section 9.8 is a guide to the process of verifying the Model 9500B
functions from the front panel. The following topics are covered:
9.8.1 DC/Square Function: DC Output
9.8.2 DC/Square Function: Square Output
9.8.3 LF Sine Function
9.8.4 Time Markers Function
9.8.5 Load Resistance Measurement Function
9.8.6 Pulse Width Function
The list of topics above are placed in the order in which the 9500B
Mainframe functions should be verified. Although it is not essential to
verify all the functions at any one time, functions higher in the list
should be verified before those lower in the list.
9.8.1 Verifying the DC/Square Function:
DC Voltage
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