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8508A vs 3458/HFL
Ease of Use Parameters
Comments
Rear input switched remotely
using IEEE 488 commands
Yes No
The 3458/HFL must be switched manually
using a front panel button.
Instrument simultaneously
displays Frequency as well as
the AC voltage & current.
Yes Selectable
Requires further commands or key presses
to determine frequency.
Two channel Ratio reference
measurement
Yes (8508A/01 only)
Yes, but limited to 12Vdc on
the Reference input
8508A can accept and compare dc to dc, ac
to ac, dc to ac, Resistance to Resistance &
Temperature to Temperature. Auto-ranging
allows inputs of different magnitude to be
connected and compared. Feature supports
the replacement of Kelvin Varley dividers,
resistance bridge and ac/dc transfer
standards
Able to load SPRT/PRT
calibration linearization
coefficients and display
temperature and resistance
simultaneously.
Yes (up to100) No
8508As displays resistance and temperature
simultaneously.
Constant energization current on
Resistance Ratio function.
Yes
No (the 3458/HFL does not
measure resistance ratio)
When measuring Resistance in Ratio mode
not only is the current the same but it is
reversed to help reduce thermal offsets.
GPIB Remote interface IEEE-488.2 IEEE-488.1
Self-cal or ACAL function Not Required Required to meet specification
8508A components are selected for
minimum drift over time and temperature.
Therefore does not require frequent internal
calibration when conditions exceed TCAL
specification.