IM CA71-E
10-1
Method of Calibrator Adjustment
10
10. Method of Calibrator Adjustment
To maintain the calibrator at high accuracy levels, it is advisable that
the calibrator be calibrated once a year. If the calibrator needs to be
readjusted, follow the procedure described below. For a service of cali-
bration or readjustment, contact the vender from which you purchased
the instrument.
10.1 Calibration Standard Selection and Envi-
ronmental Requirements
◆
Selection of Calibration Standard
Select an appropriate calibration standard having the ranges shown in
the following table and accuracy levels equal to or higher than those
shown in the table.
Source Functions
Digital multimeter
(DMM)
Note:
Also use a 100
Ω
standard resistor
for the DCA and
SINK functions
and a high-
precision 5 mA
current source
for the
Ω
/5 mA
function.
Function
to Be
Adjusted
Range
to Be
Adjusted
Remarks
Accuracy
Measuring
Range
Standard’s
Name
DCA
DCV
SINK
Ω
/1 mA
Ω
/5 mA
20 mA
Measure the current with
the DMM’s mA range or
measure the voltage
drop across the 100
Ω
standard resistor with the
DMM’s voltage range.
100 mV
1 V
10 V
30 V
20 mA
400
Ω
400
Ω
22 mA
110 mV
1.1 V
11 V
33 V
20 mA
440
Ω
2.2 V/5 mA
±
(0.002% + 0.3
µ
A)
±
(0.002% + 1.5
µ
V)
±
(0.002% + 10
µ
V)
±
(0.002% + 100
µ
V)
±
(0.002% + 1 mV)
±
(0.002% + 0.3
µ
A)
±
(0.0025% + 0.01
Ω
)
±
(0.0025%)
±
(0.0025%)
DMM’s resistance range
(1 mA)
High-precision current
source (5 mA)
DMM’s voltage range
