Fluke 9500B - Page 218

9-8 Section 9: Verifying the Model 9500B Accuracy Specification
Final Width = 215mm
Verif. Frequency Output Absolute Tolerance Output Absolute Tolerance Measured
Point. Voltage Limits (pk-pk) Voltage Limits (RMS) Value
(pk-pk) Lower Higher (RMS) Lower Higher (RMS)
+SQ1 1kHz 600.00mV 599.39mV 600.61mV 299.9979mV 299.67mV 300.28mV
+SQ2 1kHz 60.000mV 59.93mV 60.07mV 29.99799mV 29.96mV 30.03mV
+SQ3 1kHz 6.0000mV 5.984mV 6.016mV 2.999799mV 2.992mV 3.008mV
+SQ4 1kHz 6.0000V 5.99399V 6.00601V 2.999799V 2.99674V 3.00275V
+SQ5 1kHz 60.000V 59.93999V 60.06001V 29.99799V 29.96750V 30.02751V
Table 9.8.2.1 DC/Square Square (+) Verification at 1kHz into 1M Ω Load
Please copy the following table.
Enter the measurements in the Measured Value column on the copy:
9.8.2.5 Verification Procedure
Copy the three tables: 9.8.2.1, 9.8.2.2 and 9.8.2.3. Follow the correct sequence of verification points as shown on the tables, and carry out the
following operations at each verification point.
6. Amplitude a. Measure the RMS Output Voltage value.
b. Record this value in the Measured Value
column of the copy of the Table.
c. Check that the Measured Value is at or between
the Absolute Tolerance Limits.
7. 9500B Set Output OFF.
8. Press the WAVEFORM soft key. Select Square (negative) by
pressing the
key on the right of the screen. Repeat steps (2)
to (7), but using Table 9.8.2.2 for each of the verification points.
9. Press the WAVEFORM soft key. Select Square (symmetrical) by
pressing the
key on the right of the screen. Repeat steps (2)
to (7), but using Table 9.8.2.3 for each of the verification points.
1. Verification Points Refer to Table 9.8.2.1.
2. DMM Select the correct RMS Voltage range for the
verification point RMS Output Voltage.
3. 9500B Set the O/P Volts p-p and waveform as required
for the verification point:
4. 4955 If using the Model 4955 Calibration Adaptor, set its
switch to 'SQV o/c'. If not using the Model 4955,
ensure that the DMM input is AC-coupled at high
impedance.
5. 9500B Set Output ON and wait for the DMM reading to
settle.
N.B. For Operation (6), the RMS Output Voltage values, and RMS
Absolute Tolerance Limits have been derived using the following
factor for the output waveform:
(at 1kHz: RMS = 0.5 x 0.999917 x pk-pk)
Note: This factor applies only at 1kHz and assumes use of
model 4955 set to 'SQV o/c'. A compensation of 83ppm
accounts the finite transition time of the Square Wave
and the resultant fall in its RMS value.