3 Adjustment Procedures
46 Keysight 3458A Calibration Manual
AC Adjustment
This adjustment is only required once every two years or whenever the
03458-66502 PC Assembly or the 03458-66503 PC Assembly has been replaced
or repaired. This adjustment sets the internal crystal frequency for the frequency
and period measurement functions: adjusts the attenuator and amplifier high
frequency response; and adjusts the Time Interpolator timing accuracy. Following
this adjustment, the internal circuits have constant gain versus frequency.
Equipment required:
– Keysight 3325A Synthesizer/Function Generator or equivalent.
– 3 V Thermal Converter, Ballantine 1395A-3 or equivalent.
– 1 V Thermal Converter, Ballantine 1395A-1 or equivalent.
– 0.5 V Thermal Converter, Ballantine 1395A-0.4 or equivalent.
– 50 W BNC cable (keep this cable as short as possible)
– 50 W resistive load (typically a 50 W carbon composition or metal film resistor).
– BNC to Banana Plug Adapter--Keysight 1251-2277 or equivalent.
Procedure
In the following procedure, steps 1 through 12 characterize the frequency flatness
of the synthesizer and cabling configuration. The equipment setting determined
from this characterization are then used in the remaining steps to precisely adjust
the multimeter.
In the following procedure, the output voltage of the synthesizer is adjusted
with the thermal converters in-circuit. Thermal converters are typically easily
damaged by voltage overload. Use extreme care to ensure the voltage
applied to the thermal converters does not exceed the thermal converter's
maximum voltage rating.
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