Fluke 9500B - Verifying the Edge Function

Section 9: Verifying the Model 9500B Accuracy Specification 9-29
Final Width = 215mm
9.9.3 Verifying the Edge Function
9.9.3.1 Summary
Equipment requirements are given at para 9.9.3.2 and test
interconnections at para 9.9.3.3. Para 9.9.3.4 shows the Verification
Setup.
The Verification Procedure is at para 9.9.3.5, A short description of
Calculating Validity Tolerances is given at para 9.9.3.6, and the final
Uncertainty Calculation and Speed Check is at para 9.9.3.7.
The Edge Function is verified by carrying out measurements of risetime
in the sequences given at paras 9.9.3.4 and 9.9.3.5, at the verification
points shown in Table 9.9.3.1.
9.9.3.2 Equipment Requirements
• The UUT Active Head, connected to a verified Model 9500B
Mainframe.
• High-bandwidth sampling oscilloscope with bandwidth ≥6GHz for
Risetime measurements.
Examples: Tektronix Model TDS820 (6/20GHz for 9550/9560)
or HP54750 (20/50 GHz) .
• 50Ω SMA - SMA co-axial 'Trigger' cable for trigger inputs to the
high-bandwidth oscilloscope.
• High-bandwidth coaxial attenuator may be required if 9500B edge
output voltage exceeds oscilloscope input capability.
Example: HP8493 Copt20 26.5GHz 3.5mm 20dB attenuator.
• 50Ω SMA - BNC adaptor :
Example: Sumner 33 SMA-BNC-50-1
9.9.3.4 Verification Setup
1. Connections Ensure that the 9500B is connected to the
Oscilloscope as shown in Fig. 9.9.3.1, and that both
instruments are powered on and warmed up.
2. Oscilloscope Select the required function to measure edge
response.
Caution: The 9500B Edge function output is capable
of generating voltages that may cause damage to
sampling oscilloscope inputs with limited input
voltage capability. Use of an attenuator is typically
required for outputs above 1V pk-pk.
3. 9500B Ensure that the 9500B is in MANUAL mode and
then select the Edge function (
key). Select the
required output Signal Channel (50Ω Load), Trigger
Channel, Cable Select and Trigger Ratio.
Fig 9.9.3.1 Edge FunctionVerification — Interconnections
High Bandwidth Oscilloscope
Y-Channel
Input
Trigger
Input
230V PK MAX
CH 1
CH 2
CH 3
CH 4
CH 5
9500
Trigger Cable:
Wavetek Part No.
630477 (supplied)
Active Head
9510 or 9520
9.9.3.3 Interconnections
9510/9520/9530