TESTO 6681 Instruction Manual page 85

The adjusted measurement values appear after probe reset.
 Performing analog adjustment
Please refer to chapter 1.3.5.4, page 63.
In Measuring Mode, press SET, select Main Menu Adjust using 
1
or  and confirm selection with SET.
Each channel is adjusted at three points in the analog range
(at 10 %; 50 %; 90°% of the analog scale).
Select Analog Adj. Ch. 1 using  or  and confirm with SET.
2
3 Select Adj. Point 1 using  or .
4 Press SET. Read off multimeter display (e.g. 5.601 mA) and enter
this value in the user menu. Do this by scrolling one digit to the
right using  and increasing the value of digit by 1 using .
Confirm with SET or abort entry with ESC.
5 Select Adj. Point 2 using  or .
6 Press SET. Read off multimeter display (e.g. 12.001 mA) and
enter this value in the user menu. Do this by scrolling one digit to
the right using  and increasing the value of digit by 1 using .
Confirm with SET or abort entry with ESC.
7 Select Adj. Point 3 using  or .
8 Press SET. Read off multimeter display (e.g. 18.401 mA) and
enter this value in the user menu. Do this by scrolling one digit to
the right using  and increasing the value of digit by 1 using .
Confirm with SET or abort entry with ESC.
Continue to Analog Adj. Ch. 2 or 3 with  or  (repeat steps 3 to
9
8).
10 Return to Main Menu Adjust by pressing ESC.
11 Continue to Main Menu Reset using  or  or return to
Measuring Mode by pressing ESC.
testo 6681 Ethernet
- 1.4 Operation 85