Chapter 3 Getting Started
Calibration Procedure - Dual Port
Check that the “CAL OFF” message is displayed in the upper left corner of the display. This indicates that the Site Master has not been calibrated. The following procedure details how to perform the calibration. Two port calibration requires two Load components.
Step 1. Select the appropriate frequency range, as described in the procedure on page
Step 2. Press the START CAL key. The message CONNECT OPEN TO RF Out PORT will appear in the display.
Step 3. Connect the calibrated Open and press the ENTER key. The messages Mea-
suring OPEN and then CONNECT SHORT TO RF Out PORT will appear.
Step 4. Remove the Open, connect the calibrated Short and press the ENTER key. The messages Measuring SHORT and then CONNECT LOAD TO RF Out PORT will appear.
Step 5. Remove the Short, connect the calibrated Load and press the ENTER key. The messages Measuring LOAD and then CONNECT LOADS TO RF Out AND RF In PORTS will appear.
Step 6. Connect the calibrated Loads to the RF Out and RF In ports and press the ENTER key. The messages Measuring ISOLATION and then CONNECT RF Out PORT TO RF In PORT will appear.
Step 7. Remove the Loads, connect the RF Out PORT extension cable to the RF In PORT extension cable, using the proper adapter for the cable connector type, and press the ENTER key. The message Measuring THRU will appear.
Step 8. Verify that the calibration has been properly performed by checking that the CAL ON message is now displayed in the upper left corner of the display.
| LOAD |
| OPEN |
TEST PORT CABLE | SHORT |
(OPTIONAL) | LOAD |
| |
| TEST PORT CABLE |
| (OPTIONAL) |
RF IN TEST PORT |
|
| RF OUT TEST PORT |
| Site Master S251C |
1 | 2 |
START AUTO
CAL SCALE
3 4
SAVE RECALL
SETUP SETUP
5 6
LIMIT MARKER
7 8
ESCAPE
CLEAR
ENTER
SAVE | RECALL | RUN |
DISPLAY | DISPLAY | HOLD |
9 | 0 | +/- |
ON PRINT
OFF.
MODE | FREQ/DIST | AMPLITUDE | SWEEP |
Figure 3-3. Two-Port Measurement Calibration Setup
SYS
