T
.O
. 33K8-4-551-1
3
.3 If the 66252 DMM Switch is not available, disconnect the Automatic Resistance Bridge (P/O 2
.7) rear panel Rs
and Rx connections (terminals P1, P2, Cl and C2) . Connect the Rs connections (P1, P2, Cl and C2) to the Rx
connections (P 1, P2, Cl and C2), respectively. Ensure connections are restored to original configuration upon
completion of the Calibration Process.
3
.4 Connect all test equipment to appropriate power sources
. Set all POWER switches to ON and allow test equipment
warm-up period per manufacturer requirements.
3
.5 Ensure that AC power is applied to the temperature stabilized Standard Resistors
. Manufacturers suggested
minimum warm-up time is 24 hours
.
NOTE
If at any time power is removed from the Standard Resistors for over 1 minute,
there is a minimum 1 hour warm-up time for the oven to stabilize.
3
.6 Connect the Nano Volt/Micro Ohm Meter to the temperature stabilized Standard Resistors temperature monitor
terminals and turn TEMP DEV switch to ON
. Using TEMP DEV dial to obtain a VDC null reading on the Nano
Volt/Micro Ohm Meter, record temperature offset of the TEMP DEV dial before and after calibration
. TEMP DEV
dial before and after values should be between -20 m°C to +20 m°C (i
.e
., on scale).
3
.7 Connect TI to appropriate power source . Set ON/OFF switch to ON and allow a 4 hour warm-up period.
3
.8 Use only that portion of the Calibration Process that pertains to the TI being calibrated.
3
.9 Calibrate Resistance Standard (2
.10), required to perform the calibration, IAW T
.O
. 33K8-4-1-1 before use
. See
T
.O
. 33K8-4-1-1 for clarification of (at time of calibration)
. Verify accuracies at time of calibration in
T
.O
. 33K8-4-1-1 still meet the requirements.
3
.10 Perform the DC Reference Divider Self-Calibration IAW the Commercial Data prior to use.
3
.11 Perform the DC Voltage Divider Self-Calibration IAW the MTO prior to use.
3
.12 Verify all TI inputs (including rear input) are disconnected and execute the TEST function
. The TI display must
read SELF TEST PASSED.
3
.13 Ensure the TI is in the FULL MENU mode by pressing:
3
.14 Check the TI Internal Temperature by pressing the TI keys in the following sequence:
Menu
Enter
p
in
.
)
431 e)
v
4iHF11
4310
T
ESNer
(record this value).
3
.15 Press the TI keys in the following sequence to obtain CAL? 58:
. The TI display must be within ±5 °C of the value recorded in
step 3
.14.
3
.16 Repeat step 3
.15 for CAL? 59 and CAL? 60
.
NOTE
If TI displays greater than 5 °C difference from the internal temperature
recorded in step 3
.14, CAL 0, CAL 10 and CAL 10 k should be performed
IAW the Manufacturers Calibration Manual.
a
5
C
6HF1,
431me)
V
Change 1 17