9-20 Section 9: Verifying the Model 9500B Accuracy Specification
Final Width = 215mm
Sub-section 9.9 is a guide to the process of verifying the Model 9560,
9550, 9530, and 9510 Heads functions from the front panel. The
following topics are covered:
9.9.1 Levelled Sine Function: LF Gain
9.9.2 Levelled Sine Function: Flatness
9.9.3 Edge Function
9.9.4 Load Capacitance Measurement Function
The list of topics above are placed in the order in which the 9500B Head
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.
Head verification involves the use of a verified 9500B Mainframe.
Note: Heads can be verified only within the bandwidth of the
mainframe.
e.g. Head Model 9510 with Mainframe Variant 9500B/600
can only be verified to 600MHz.
9.9 9510/9530/9550/9560 Head Verification by Functions
9.9.1 Verifying the Levelled Sine Function:
LF Gain
9.9.1.1 Summary
Equipment requirements are given at para 9.9.1.2 and test
interconnections at para 9.9.1.3.
The Levelled Sine Function is verified by carrying out measurements
of amplitude at frequencies of 1kHz, 45kHz and 50kHz; in the sequences
given at para 9.9.1.4 and 9.9.1.5, at the verification points shown in
Table 9.9.1.1.
9.9.1.2 Equipment Requirements
• The UUT Active Head, connected to a verified Model 9500B
Mainframe (refer to Sub-section 9.8.3).
• A high resolution Standards DMM with RMS AC Voltage accuracy
of 0.3% or better, from 10mV to 1.5V, at 1kHz, 45kHz and 50kHz.
Example: Model 1281 Digital Multimeter.
• An adaptor to convert from PC3.5 or BNC to 4mm leads.
Example: Model 4955 Calibration Adaptor and PC3.5 to BNC
adaptor.
• Short, high-quality 4mm leads for connection between the
Calibration Adaptor the DMM.
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