TB 9-4910-558-24
9. Dc Amperes Accuracy
a. Performance Check
(1) Connect equipment as shown in figure 1. Position dc current shunt range plugs
to 10.
(2) Set TI AMMETER HEATER/OFF/EXTERNAL MODE switch to EXTERNAL
MODE.
(3) Adjust dc power supply controls for a TI AMMETER indication of 5 A. Digital
multimeter will indicate between 42.50 and 57.50 mV dc.
NOTE
Reduce power supply output current to zero before moving dc
current shunt connection.
(4) Move dc current shunt connection from 10 A range to 100 A range and position
dc current shunt range plugs to 100.
(5) Adjust dc power supply controls for TI AMMETER indications as listed in table 4.
Digital multimeter indications will be within limits as specified in table 4.
(6) Set TI AMMETER HEATER/OFF/ EXTERNAL MODE switch to OFF.
DIGITAL MULTIMETER
DC CURRENT
SHUNT
INPUT
COM
300
COMMON
100
10AMP
POTENTIAL
TEST INSTRUMENT
DC POWER SUPPLY
AMMETER
Figure 1. Dc current - equipment setup.
Table 4. Dc Amps Accuracy
Test instrument
Digital multimeter
AMMETER
indications
indications
(mV dc)
(A)
Min
Max
10
9.25
10.75
15
14.25
15.75
25
24.25
25.75
