2-2 Measurement Concepts
Measurement overview
The basic measurement capabilities of Model 6514 are summarized in Table 2-1. Accuracy
for each measurement function and range is listed in specifications (Appendix A).
Performance considerations
Warm-up period
Model 6514 can be used within one minute after it is turned on. However, the instrument
should be turned on and allowed to warm up for at least one hour before use to achieve rated
accuracy. If the instrument has been exposed to extreme temperatures, allow extra time for the
internal temperature to stabilize.
Autozero
To help maintain stability and accuracy over time and changes in temperature, the Model
6514 periodically measures internal voltages corresponding to offsets (zero) and amplifier gains.
These measurements are used in the algorithm to calculate the reading of the input signal. This
process is known as autozeroing.
When autozero is disabled, the offset and gain measurements are not performed. This
increases measurement speed. However, the zero and gain reference points will eventually drift
resulting in inaccurate readings of the input signal. It is recommended that autozero only be dis-
abled for short periods of time.
Autozero cannot be disabled from the front panel, however, it can be enabled from the front
panel by restoring factory or GPIB default conditions.
Table 2-1
Basic measurement capabilities
Function Reading Range Available Ranges
Volts ±10uV to ±210V 2V, 20V and 200V
Amps ±100aA to ±21mA 20pA, 200pA, 2nA, 20nA, 200nA, 2uA, 20uA,
200uA, 2mA and 20mA
Ohms 10mΩ to 210GΩ 2kΩ, 20kΩ, 200kΩ, 2MΩ, 20MΩ, 200MΩ, 2GΩ,
20GΩ and 200GΩ
Coulombs 10fC to 21µC 20nC, 200nC, 2µC, and 20µC
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