18
®
®
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Section Nine Calibration
Note
•
Calibration : In order to keep the designed accuracy of this
Instrument. it is recommendable to calibrate your calibrator once a
year. The following example show the use of recommended
standard equipment to perform the calibration.
•
Usage : Never apply more than the max permitted voltage to the
input of the calibrator, otherwise the over voltage will lead to possible
damage to the input section.
•
Usage: during the operation, avoid short circuit and never apply
more than the max .permitted voltage to the output of the Instrument
or to a co-working standard device, otherwise any mal-operation will
cause possible damage to their internal circuits.
!
Caution
Selecting Standard Equipment
Table 10-1
Calibration
Item
Standard
Equipment
output
Range
Accuracy
Recommended
Output
Measure
ment
DCA 20mA
DCA 20mA
DCV 26V
Digit
meter
Standard
source
Standard
source
MAX 22mA
MAX 33mA
MAX 33V
+ (50ppm
+0.4uA)
-
+ (100ppm
+0.2uA)
-
+ (12ppm
+15uV)
-
Digit meter
KEITHLEY 2000
Standard resistance:
BZ10-100
W
5520(FLUKE)
or equivalent
Ambient Condition for Calibration
Ambient temperature :
23°C+1°C ;
Relative humidity :
45 to 75% RH;
Preheating :
standard instrument should be preheated to
specified time;
put this Instrument in calibration environment for 24 hours, then
power, and set it in non auto power off state, and preheat for half
an hour.
-
Note
!!
!!
Power supply for calibrator; during the calibration, it is
recommendable to use 2 1.5V (Lr6) batteries.
Operating Output Calibration
Operating calibration in order of items and calibration points
listed in Table 10-2,
Item
No.
Output Range
Calibration Point
1
DCA/20mA
0
0 FS
FS
1) In power-off state, press the keys (OUTPUT / INPUT) and
(power) simultaneously to power on, and release the
(OUTPUT / INPUT) key only after the LCD displays all the
contents. The Instrument enters into the calibration mode, and
the symbols ‘ CAL 0’ appear in the LCD.