Calibration
Calibration Adjustments
5
5-51
Calibration Adjustments
This section of the chapter provides calibration adjustment procedures for correcting out-
of-tolerance parameters so they meet published specifications. If the Instrument fails the
performance test, it is an indication that the Instrument requires calibration adjustment
and/or repair. Calibration adjustment does not require removal of the covers. See
Chapter 7, Maintenance, for internal access and repair information.
Note
The instrument top cover is removable for air filter cleaning access without
the need to break calibration integrity seals. A calibration integrity seal is
located on the internal top shield, revealed once the outer top cover has
been removed (see Chapter 7, Maintenance for details). Additional
calibration integrity seals are located on the rear panel over the lower
outer cover and over the calibration enable switch. It is recommended that
users apply calibration integrity seals in the same three locations.
Calibration adjustment of the Instrument may be performed locally from the instrument
front panel or remotely using the IEEE-488 bus.
During calibration adjustment, the output amplitude is measured to determine the
absolute level error at the amplitude/frequency combination set. An entry is made via a
front panel key sequence or via GPIB command sequence to adjust the output to correct
any error from nominal, and cause storage of an appropriate correction factor in the
internal non-volatile memory. This process is required at a variety of
amplitude/frequency points throughout the amplitude and frequency range of the
instrument. It is recommended that the users of the calibration process familiarize
themselves with the entire calibration adjustment process prior to attempting any
calibration adjustment operations.
Environmental and warm up conditions required for performing the calibration
adjustments are as follows:
•
Ambient temperature of the test environment is 23 ± 1 °C.
•
Warm up time (continuous operation) for the Instrument, with all covers in place, is
1 hour (24 hours for adjusting the Reference Frequency).
Each of the following procedures is accompanied by a list of the equipment required to
perform the procedure and a figure detailing the equipment connections for the
procedure. Perform the procedures in sequence, ensuring that all prior equipment
connections have been removed before starting a new procedure.
During the course of the adjustment process, the operator is prompted to use an AC
Measurement Standard, followed by a power meter and sensor(s), and finally, a spectrum
analyzer/measuring receiver. At various points within the process, values previously
adjusted using one reference device are transferred to another for subsequent use.
To minimize the number of connection changes required during Instrument calibration
adjustment, the steps are sequenced so that all steps requiring the AC Measurement
Standard, for example, are performed together, as are the various steps requiring each of
the other required reference devices.
Calibration adjustment of the Instrument is a systematic process; at each step, the display
indicates the desired adjustment target level and frequency values, and directs the
operator to the required measurement device. Following measurement of the expected
target value, the operator, using the Instrument alphanumeric keypad, enters the measured
value, followed by the soft keys,
Accept Adjust
, and
Next Target
.
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