Preliminary Instructions - TB-9-4931-383-500007

TB 9-4931-383-50

NOTE

Unless otherwise specified, all controls and control settings

refer to the TI.

c. When indications specified in paragraph 10 are not within tolerance, perform the

power supply check prior to making adjustments. After adjustments are made, repeat

paragraph 10. Do not perform power supply check if all other parameters are within

tolerance.

d. Position TI controls as listed in (1) through (5) below:

(1) VOLTAGE RANGE switch to 10.

(2) Voltage dials to 1.000000.

(3) METER switch to VOLTAGE.

(4) VOLTAGE TRIP control fully clockwise.

(5) CURRENT LIMIT control fully clockwise.

e. Connect TI to autotransformer (A1) and leave connected throughout procedure.

NOTE

The sensitivity switch (B1) has been included in equipment

setup for safety and to allow reversal of connections to null

detector (A4). Detailed operation of the switch is not included

in step-by-step procedure.

f. Connect autotransformer to a 115-volt ac source and adjust for a 115-volt output.

g. Turn POWER switch to STANDBY/RESET and allow at least 1 hour for warm-up.

h. Connect operating voltage source (A5) to voltage regulator (A8), set its POWER

switch to STANDBY/ RESET, and allow to warm-up until called for.

i. It is necessary to know actual value of 1.018 +∆E output of dc transfer standard (A2)

to complete this calibration. If calibration of dc transfer standard is no more than 10 days

old, the value recorded at time of calibration is sufficient. If calibration is more than 10

days old, determine the value by performing (1) through (11) below:

(1) Connect equipment as shown in figure 1.