Section 6
OM6530-C1-00
19 November, 2019
6-13
6.4.3.
Cintegrator COEFFICIENTS
The exact value of the reference resistor (used during calibration to compute the capacitor
and threshold variances) is entered into the instruments Non-Volatile memory either from
the front panel (see section 4) or through one of the bus interfaces.
The instrument computes the variance of each integration capacitor. A traceable Standard
Reference resistor (100 MΩ) is connected between the instruments source and input
terminals. The instrument then takes readings of the Standard Reference resistance until
the calibration criteria are met and computes an average resistance value with corrections
for the source voltage and the protection resistor. Using the average resistance value and
the reference resistance value a number representing the variance of the capacitor from its
nominal value is computed. The capacitor coefficient is automatically stored into the
instruments Non-Volatile memory. (see Section 4.9.2.1.2)
6.4.4.
Tintegrator COEFFICIENTS
The instrument also computes the variance of the integration thresholds. A known
Standard Reference resistor (100 MΩ) is connected between the instruments source and
input terminals. The instrument then takes readings of the Standard Reference resistance
until the calibration criteria are met and computes an average value with corrections for
the source voltage, the integration capacitor and the protection resistor. The average value
and the resistance value are used to compute a number representing the variance of the
threshold from its nominal value. The threshold variance is automatically stored in the
instruments Non-Volatile memory. The Tintegrator Coefficient for the 10 V threshold is
assumed to be 0. (see Section 4.9.2.1.3)
