BIT 4886 051010
3-3
3.3
CALIBRATION OF BIT 4886 INTERFACE CARD
Calibration of the BIT 4886 card is performed using SCPI commands. The Instrument driver
available at www.kepcopower.com/drivers.htm provides a graphical interface with informational
displays and prompts which lead you through the calibration of the BIT 4886 card. This VISA
compliant driver works with many GPIB cards from suppliers like National Instruments and
Hewlett-Packard.
Calibration using the graphical interface is described in PAR. 3.3.2; as an alternative to the
graphical interface, the BIT 4886 card can also be calibrated using the manual procedure
described in PAR. 3.3.1.
NOTE: During calibration various circuits of the BIT 4886 Interface Card are verified. If an error
occurs during the verification process, the interface card will beep and an error 240,
Hardware, will be placed in the error queue.
The calibration values for different BOP Models are defined in Tables 3-1 and 3-2 for voltage
and current, respectively. For each step requiring a measurement during calibration the toler-
ance of the measurements are included in Tables 3-1 and 3-2 and are not repeated in the indi-
vidual steps.
Table 3-3 lists suggested sense resistors and includes Kepco and Manufacturer’s part numbers.
The accuracy of these resistors is 0.1% and will result in a system accuracy of 0.11% if the listed
values in Tables 3-1 and 3-2 are used.
For a system accuracy of 0.01%, measure the actual
value of the sense resistor accurate to 7 places. Then calculate the expected values per
Table 3-2 notes A-E; use with the listed tolerances of Table 3-2 to perform the calibration
.
TABLE 3-1. CALIBRATION MEASUREMENTS AND TOLERANCES - VOLTAGE
MODEL
LOW
RANGE
ZERO
VOLT
ZERO
MAX
OUTPUT
HIGH
RANGE
ACCURACY
LOW
RANGE
ACCURACY
LOW
RANGE
NOMINAL
VOLTAGE
LIMIT
ADJUST
PAR. 3.3.1
PAR. 3.3.1
PAR. 3.3.1
PAR. 3.3.1
STEPS 11, 13
PAR. 3.3.1
STEP 15
PAR. 3.3.2
N/A
PAR. 3.3.2
PAR. 3.3.2
N/A
PAR. 3.3.2
STEP 3
BOP 20-5M
BOP 20-10M
BOP 20-20M
0V
±0.0003V
0V
±0.0003V
20V
20.0015V (MAX
)
-20.0015V (MIN
)
±0.0015V
5.0003V (MAX
)
-5.0003V (MIN
)
±0.0003V
5V
+20.0035V
±0.0035V
BOP 36-6M
BOP 36-12M
0V
±0.0004V
0V
±0.0004V
36V
36.0027V (MAX
)
-36.0027V (MIN
)
±0.0027
9.0006V (MAX
)
-9.0006V (MIN
)
±0.0006
9V
+36.005V
±0.005V
BOP 50-2M
BOP 50-4
BOP 50-8
0V
±0.0005V
0V
±0.0005V
50V
50.0035V (MAX
)
-50.0035V (MIN
)
±0.0035
12.5009V (MAX
)
-12.5009V (MIN
)
±0.0009
12.5V
+50.007V
±0.007V
BOP 72-3M
BOP 72-6M
0V
±0.001V
0V
±0.001V
72V
72.005V (MAX
)
-72.005V (MIN
)
±0.005
18.0014V (MAX
)
-18.0014V (MIN
)
±0.0014
18V
+72.0095V
±0.0095V
BOP 100-1M
BOP 100-2M
BOP 100-4M
0V
±0.001V
0V
±0.001V
100V
100.0075V (MAX
)
-100.0075V (MIN
)
±0.0075
25.002V (MAX
)
-25.002V (MIN
)
±0.002
25V
+100.0125V
±0.0125V
BOP 200-1M
0V
±0.002V
0V
±0.002V
200V
200.01V (MAX
)
-200.01V (MIN
)
±0.01
50.004V (MAX
)
-50.004V (MIN
)
±0.004
50V
+200.025V
±0.025V
