TB 9-6625-2020-24
17. Ohms
a. Performance Check
and LOW.
(1) Connect calibrator OUTPUT HI and LO to TI VOLTS/
pushbutton.
(2) Press TI k
range pushbutton.
(3) Press TI 20 k
(4) Release TI HI/LO pushbutton to HI.
(5) Set calibrator for a 19 k output, EX SNS off, and 2 wire Comp on, then using
output adjustment controls, set calibrator control display Reading equal to TI indication. If
calibrator control display Error indication is not within 0.5526%, perform b below.
(6) Press TI HI/LO pushbutton to LO and repeat (5) above.
(7) Repeat technique of (3) through (6) above using settings and indications in table 9.
Table 9. Ohms
Calibrator
Control display Error
Test instrument
indications ( %)
range
Output settings
( )
pushbuttons
190
0.6579
200
1.9 k
0.5526
2k
k1
190
0.5526
200 k
1.9 M
0.5526
2000 k
AUTO 20 M
19
M
1.0526
Set calibrator 2 wire Comp to off before setting output to 190 k .
1
b. Adjustments. Adjust R1306 (fig. 2) until TI indication equals calibrator output
display indication rounded to TI digits of resolution (R).
18. Dc Current
a. Performance Check
(1) Connect calibrator OUTPUT HI and LO to TI mA and LOW.
(2) Press TI mA DC pushbutton.
(3) Press TI range pushbuttons and set calibrator output to settings listed in table 10.
TI will indicate within limits specified.
Table 10. Dc Current
Test instrument
Test instrument
Calibrator
range
indications
output settings
pushbuttons
Min
Max
A
A
A
A
200
180
179.5
180.5
2
mA
1.8
mA
1.795 mA
1.805
mA
20 mA
18
mA
17.95 mA
18.05
mA
200
mA
180
mA
179.5
mA
180.5
mA
2000
mA
1.8
A
1795
mA
1805
mA
