Using the RS-232C Serial Interface
Printing Calibration Reports 6
6-17
Table 6-2. Annotation for Shift Results Printout (continued)
K
The values of each internal reference as established during the most recent calibration. The unit for
each value is the same as listed in the reference name, just to the left under the REFERENCE
heading.
L
The previous value of each internal reference. For a 5720 calibration check, this column is labeled
Most Recent and refers to the active constants stored in EEPROM.
M
The reference shift expressed in parts per million (ppm). The formula used for this calculation is:
1,000,000 x (Most Recent - Previous) / (Previous) = shift (ppm)
For 5720 calibration check, the formula is:
1,000,000 x (Cal check - Most Recent) / (Most Recent) = shift (ppm)
The remaining pages in the calibration report give information which describe how the output has
changed between the time two different calibration activities were performed. (See #1.) The
calibrator checks each range at multiple points, as described further on.
N
This is the name of the range to which the shift information pertains.
O
The calibrator calculates shift information at multiple points, depending on the range and mode (dc
V, ac V, etc.). Each line in the report for a given range contains shift information for a particular
point. The “Point” column indicates which point in the range the data is calculated for.
On this example page of dc voltage output shifts, two points are listed for each range, +FS and -FS.
+FS refers to the positive full-scale value of the range, as given in the RANGE column. -FS refers to
the negative full-scale value for the range. For the 220 mV range, +FS means +220 mV dc and -FS
means -220 mV dc. These points are used to calculate the amount of full scale shift, as discussed
further on.
P
This column lists how much the zero output has shifted between calibration events (i.e., comparing
the most recent with the previous calibration). Assuming the calibrator output was exactly 0V
immediately after the previous calibration, the number listed in this column shows what the
calibrator output was just before the most recent calibration was performed. There are two zero
checks for each dc range, one for the portion of the range >0V and one for the portion <0V. The
report includes the positive portion zero shifts in the +FS line and the negative portion zero shifts in
the -FS line.
For example, the positive portion zero of the 220 mV range shifted from 0.00000 mV to -
0.00020 mV between the previous calibration and the most recent calibration. (Listed under the
220 mV range, +FS point.) If this calibration data is stored, all positive outputs on the 220 mV range
will be increased by 0.00020 mV.
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