TB 9-6625-133-40
CTUAL - NOMINAL
,
ERROR ppm = A
,
(8) Calculate TI error using the formula below.
NOMINAL
Where:
ACTUAL= TI indication
NOMINAL = True applied current
(9) TI will indicate within the limits of table 8 if not, perform b below.
(10) Repeat technique of (5) through (9) above for remaining rows in table 8. TI will
indicate within the limits of table 8.
NOTE
Allow sufficient time (~10 minutes) for TI 20 A dc range to
stabilize before taking final reading.
(11) Set calibrator output to minimum and disconnect equipment set-up.
Table 8. DC Current Verification.
Calibrator
TI
Displayed
True Applied
Range
Indication
Min
Measured
Max
(A)
(A)
(A)
(A)
(ppm)
(ppm)
(ppm)
100 μ
200 μ
-20.2
20.2
-100 μ
200 μ
-20.2
20.2
1m
2m
-20.2
20.2
-1 m
2m
-20.2
20.2
10 m
20 m
-22.2
22.2
-10 m
20 m
-22.2
22.2
100 m
200 m
-68.2
68.2
-100 m
200 m
-68.2
68.2
1
2
-241.2
241.2
-1
2
-241.2
241.2
1
10
20
-540.2
540.2
-10
20
-540.2
540.2
Set calibrator OPR/STBY to STBY. Move connection to amplifier and set calibrator OPR/STBY to OPR.
1
b. Adjustments. Complete all performance checks in the entire procedure noting AS
FOUND failures. Use paragraph 15 e for adjustments.
13. AC Current
a. Performance Check
NOTE
The 1 mA active current shunt should be energized for at least
10 minutes before attempting to make a stable measurement.
(1) Prepare TI for zeroing by ensuring that all INPUT terminals are open.
(2) Press TI keys as listed in (a) through (j) below.
(a) CLEAR
(b) [PWR UP DFLT]
