IM CA71-E
10-1
Method of Calibrator
Adjustment
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App
10. Method of Calibrator Adjustment
We recommend that you calibrate the instrument once a year to
maintain its accuracy (high accuracy).
If the calibrator needs to be readjusted, follow the procedure
described below.
For a service of calibration or readjustment, contact the dealer from
which you purchased the instrument.
10.1 Calibration Standard Selection and
Environmental Requirements
■ Selection of Calibration Standard
Select an appropriate calibration standard whose accuracies are
controlled to be equal to or higher than those shown in the following
table for the ranges shown in the table.
Source Functions
Function
to Be
Adjusted
Standard's
Name
Range
to Be
Adjusted
Measuring
Range
Accuracy
Remarks
DCV
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.
100 mV
1 V
10 V
30 V
110 mV
1.1 V
11 V
33 V
±
(
0.004%+3 μV)
±
(
0.004%+20 μV)
±
(
0.004%+200 μV)
±
(
0.004%+2 mV)
---
DCA
20 mA
22 mA
±
(
0.005%+0.6 μA)
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.
SINK
20 mA
20 mA
±
(
0.01%+0.6 μA)
Ω/1 mA
400 Ω
440 Ω
±
(
0.005%+0.02 Ω)
DMM's resistance
range (1mA)
Ω/5 mA
400 Ω
2.2 V/5 mA
±
(
0.005%
)
High-precision
current source
(5 mA)
±
(
0.005%
)
DMM's voltage
range
