Fluke 96000 Series Service Manual page 74

96000 Series
Service Manual
The 6 dB attenuator is used to minimize mismatch errors. In some
cases, additional attenuation is required to satisfy alternative
Measuring Receiver maximum input limitations.
Unwanted interference from signals at 10 MHz due to the frequency
reference outputs of equipment operating in the vicinity of the test
setup or the equipment used during the tests can cause erroneous
results. To avoid such problems, add a small offset (50 kHz) to the
listed nominal test frequency.
2. On the UUT enable the REF FREQUENCY OUTPUT at 10 MHz, set the UUT
For the 96270A, ensure the Leveling Head output is selected.
3. Let the Measuring Receiver tune the input signal, and then set the controls to
4. At each attenuation level listed in Table 3-15, allow the Measuring Receiver
5. Return the UUT attenuation to 0 dB (+10 dBm).
6. Repeat steps 2 through 6 at the attenuation levels shown in Table 3-15 for
7. Set the UUT to STBY.
Nominal Attenuation
0 dB
-7 dB
-17 dB
-27 dB
-37 dB
-47 dB
-57 dB
-67 dB
-76 dB
-85 dB
-95 dB
-105 dB
3-32
as follows:
Frequency
Level
Output
measure RF level, relative (dB) to the current input level.
reading to stabilize, ensuring the indicated value is within the relevant
tolerance.
frequencies of 50 MHz and 100 MHz.
Table 3-15. 50 Ω Leveling Head Attenuation Accuracy (50 Ω) Test Points
+10 dBm
+3 dBm
-17 dBm
-27 dBm
-37 dBm
-47 dBm
-57 dBm
-67 dBm
-66 dBm
-75 dBm
-85 dBm
-95 dBm
Note
Note
Note
10 MHz
+10 dBm
OPER
Absolute Output Level
Specification
Reference
±0.02 dB
±0.02 dB
±0.02 dB
±0.02 dB
±0.02 dB
±0.03 dB
±0.05 dB
±0.07 dB
±0.07 dB
±0.15 dB
±0.15 dB