YOKOGAWA CA71 HANDY CAL, Руководство пользователя

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IM CA71-E
10-1
Method of Calibrator
Adjustment
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App
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 calibration or readjustment, contact the vender from
which you purchased the instrument.
10.1 Calibration Standard Selection and
Environmental 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
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 ±
( 0.002%+1.5 μV)
±
( 0.002%+10 μV)
±
( 0.002%+100 μV)
±
(
0.002%+1 mV)
---
DCA 20 mA 22 mA ±
( 0.002%+0.3 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 ±
( 0.002%+0.3 μA)
Ω/1 mA 400 Ω 440 Ω
±
( 0.0025%+0.01 Ω)
DMM's resistance
range (1mA)
Ω/5 mA 400 Ω
2.2 V/5 mA
±
(
0.0025%
)
High-precision
current source
(5 mA)
±
(
0.0025%
)
DMM's voltage
range