Operating instructions

IES Corporation, 2324 SE 11
th
Ave, Portland, OR 97214
PHONE: [phone] FAX: [phone] e-mail: [e-mail]
196
ED2180 and 2080 Multiscale -- Calibration (continued p. 2) / Mettler/Sauter
3) LINEARITY CHECKING
Two test weights, each approximately 1/2 capacity, are required.
Disregard the decimal point, so that all readings are recorded as
whole numbers. (Example: 36.449 becomes 36449).
a. Place weight A on the pan, note reading. This is "A"
b. Remove weight A, replace with B. Tare.
c. Place A on with B. Note reading. This is "C"
d. Calculate A - C = ________ , this is number "D" If D is zero,
then go to section 4, otherwise proceed to step e. (Remember to
record sign in this calculation.)
LINEARITY ADJUSTMENT
e. Note settings of switches 17 - 21, write them down.
f. Using the table #3, calculate the sum of the values of the CLOSED
linearity switches. This is "F".
Switch Value
17 16
18 8
19 4 Table #3
20 2
21 1
g. Calculate D + F = ___________ . This is "G".
h. Change the switch settings so that new sum of values is equal to G.
i. Start again from step a. to verify good linearity.
4.) SPAN
a. Tare instrument to all zeroes, place calibration weight on pan.
b. Calculate percent error.
c. Use table #4 to figure out which calibration clip-switches to close
or open. Closing switches increases calibration.
Switch %
1 8
2 4 Table #4
3 2
4 1
5 .5
Potentiometer P1 - .3% range
d. Remove test weight and re-tare. Repeat a. through c. as necessary.
(Continued next page)