10 TEGAM WAY • GENEVA, OHIO 44041
440-466-
6100 • FAX 440
-466-
4-13
Section IV
–
Operating Instructions
Normal Operation
Normal calibration laboratory practice dictates that the environment should be closely controlled.
This will minimize errors introduced by temperature and humidity changes. A nominal
temperature as specified in Table 1.1 provides a good working condition. Controlled
temperatures also stabilize the aging process of the standards.
RF Power Measurement Procedure
Power Measurement with a legacy 478A power sensor
CAUTION: UNDER NO CIRCUMSTANCES APPLY MORE THEN 30 mW TO THE MOUNT
2
.
Equipment:
•
TEGAM Model 1830A RF Power Meter
•
Agilent 478A or 8478B Power Sensor
•
Suitable RF Signal Generator (Frequency Range dependent on sensor)
•
TEGAM 1830A to Sensor Connector Cable (CA-6-48)
Connections:
1.
Plug in all test and measurement equipment
2.
Connect specialized TEGAM cable (P/N CA-6-48) to the Model 1830A and Power
Sensor
3
3.
Allow necessary warm up time for each piece of equipment
4
4.
Connect RF Source to input of sensor (DO NOT TURN RF ON)
Procedure:
1.
Turn RF OUTPUT “OFF” on
the RF Signal Generator
2.
Using the CF (Calibration Factor) soft-key enter the calibration factor for the desired
frequency. (Typically this can be found on the sensor)
3.
Using the ZERO soft-key, ZERO the 1830A. (This may take a few seconds)
4.
Turn RF OUTPUT “ON” on the RF Signal Generator
5.
Read corrected power from the front panel of the Model 1830A
5
2
This caution pertains to Weinschel type coaxial thermistor bolometers designed to balance at RF off with approximately 30mW. DC
Substitution bolometry requires removal of DC to indicate applied power, so application of more RF than there is DC applied originally
will inevitably result in an incorrect reading or even overheated thermistor. Refer to the manual of whichever sensor is being used
for specific power limits.
3
This is the point at which the sensor begins to warm up.
4
The 1830A itself will warm up in approximately one hour, depending on airflo
w conditions. Please refer to bolometer’s manual for
warm-up time.
5
Allow the reading from the 1830A to settle before recording a reading. In most conditions, a few seconds after applying RF is
adequate.
