User's Manual Part 3

Test Equipment Preparation – continued
PRELIMINARY
1X SCt4812ET Lite BTS Optimization/ATP
08/01/2001
F-10
Calibrating HP437 Power Meter
Precise transmit output power calibration measurements are made using
a bolometer–type broadband power meter with a sensitive power sensor.
Follow the steps outlined in Table F-9 to enter information unique to the
power sensor before calibrating the test setup. Refer to Figure F-5 as
required.
This procedure must be done in conjunction with the
automated calibration to enter power sensor specific
calibration values.
IMPORTANT
*
CONNECT POWER
SENSOR WITH POWER
METER TURNED OFF
CONNECT POWER SENSOR
TO POWER REFERENCE
WHEN CALIBRATING UNIT.
POWER REFERENCE IS
ENABLED USING THE SHIFT '
KEYS
SHIFT (BLUE) PUSHBUTTON –
ACCESSES FUNCTION AND
DATA ENTRY KEYS IDENTIFIED
WITH LIGHT BLUE TEXT ON
THE FRONT PANEL ABOVE
THE BUTTONS
FW00308
Figure F-5: Power Meter Detail
Table F-9: Power Meter Calibration Procedure
Step Action
! CAUTION
Do not connect/disconnect the power meter sensor cable with ac power applied to the meter.
Disconnection could result in destruction of the sensing element or mis–calibration.
1 – Make sure the power meter AC LINE pushbutton is OFF.
– Connect the power sensor cable to the SENSOR input.
2 Set the AC LINE pushbutton to ON.
NOTE
The calibration should be performed only after the power meter and sensor have been allowed to
warm–up and stabilize for a minimum of 60 minutes.
3 Perform the following to set or verify the GPIB address:
– To enter the SPECIAL data entry function, press
[SHIFT] then [PRESET].
– Use the [y] or [b] button to select HP–IB ADRS; then press [ENTER].
– Use the
[y] or [b] button to select HP–IB ADRS 13; then press [ENTER].
– To EXIT the SPECIAL data entry function press
[SHIFT] then [ENTER].
. . . continued on next page
F