96000 Series
Service Manual
3-18
assembly and enable the REF FREQUENCY OUTPUT at 10 MHz. On the
UUT, push to select the Frequency Counter function, followed by the
Frequency Counter softkey.
1. Select the 80 s Gate Time and wait until a valid reading is shown. (If required,
a reading can be triggered by pushing the Reading Mode, followed by Single
Shot, and then Take Reading softkeys).
2. Check that the reading is between 10.000 000 001 MHz and
9.999 999 999 MHz.
Note
To minimize Leveling Head interchange, the following tests are
divided into 50
Ω
and 75
Ω
sections.
Level Accuracy – 50
Ω
Leveling Head (96040A and 96270A)
Equipment required for this test:
• AC Measurement Standard
• Precision 50 Ω feedthrough termination
• 50 Ω Type-N female-to-BNC male adapter
• Power Meter
• Power Sensor, Thermal, 50 Ω
• Power Sensor, Diode, 50 Ω
• Precision Adapter, Type-N female-to-female, 50 Ω
• Spectrum Analyzer
• 50 Ω Leveling Head (supplied with UUT)
Use the following procedure to verify the absolute level accuracy of the UUT
50 output. The procedure uses an AC Measurement Standard, followed by a
Power Meter and sensors, and finally, a Spectrum Analyzer/Measuring Receiver.
At various points within the process values previously measured using one
reference device are required for subsequent use with another device. To aid
readability, the procedure is divided into stages. The complete procedure must
be performed in the sequence described. It is recommended that users
familiarize themselves with the entire absolute level accuracy verification
procedure before commencing.
Note
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, when test frequencies are from
10 MHz to 300 MHz, add a small offset (50 kHz) to the nominal
frequency if the test frequency is a multiple of 10 MHz.
Low Frequency Test Points (steps 1-7)
1. Connect the 50 Ω Leveling Head to the INPUT 1 connector on the AC
Measurement Standard using a precision 50 Ω feedthrough termination. (If a
Type-N feedthrough termination is not available, use a BNC 50 Ω
feedthrough termination and appropriate adapters. Ensure that BNC
connector contact resistance and repeatability does not significantly degrade
measurement uncertainty). Select INPUT 1. See Figure 3-5 for equipment
connections.
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