10.3-2
Section 10: Calibrating the Model 9100: Standard Calibration — Basic Sequences
Final Width = 215mm
10.3.1
Introduction
10.3.1.1
Aim of Calibration
The aim of calibrating the Model 9100 Universal calibrator is to determine the accuracy
of its outputs, and if necessary adjust them so that they are within specification. If this
calibration is to be traceable, then the 9100's outputs must be compared with calibration
standards whose higher accuracy ('Test Uncertainty Ratio' at least 3:1 with respect to the
9100) has been traceably calibrated to National or International Standards.
10.3.1.2
General Calibration Process
As mentioned earlier in Section 10.2, calibrating each of the 9100's functions can be
broken down into three distinct stages as follows:
1) Select the required 'hardware configuration'.
2) Select 'target' values at which this hardware configuration will be calibrated.
3) Determine the 9100's output error at each of these target values, and generate a
suitable compensating correction factor.
This sub-section 10.3 describes the general process of calibrating the 9100 using front-
panel controls.
To demonstrate this process, the following description uses, as an example, the 9100's DC
Voltage hardware configuration which generates output voltages in the range -3.20000V
to -0.32001V and from +0.32001V to +3.20000V. This hardware configuration requires
two target-value calibration points, and two associated correction factors. The factors are
stored in non-volatile memory, and subsequently used to correct all outputs which
employ the hardware configuration.
We will start by assuming that the 'Cal' mode of the DC Voltage function has been selected
as described in Section 10.2. of this handbook. This presents a Cal mode function screen,
similar to that illustrated opposite.
