10 TEGAM WAY • GENEVA, OHIO 44041
440-466-
6100 • FAX 440
-466-
4-4
Section IV
–
Operating Instructions
Range (Read/Write)
Located SETUP
—
Instrument menu. Select the proper measurement range. There are two
possible measurement ranges available on the 1830A:
•
10 mW
•
100 mW
10 mW
–
This range assumes that power below 10 mW will be measured. Similar to a DMM
range selection, the more accurate your range the more accurate the reading. A user could
select 100 mW range to measure 1 mW but the reading would be much more accurate in
the 10 mW range.
100 mW
–
This range assumes that power greater than 10 mW will be measured. Similar
to a DMM range selection, the user cannot select a range below the desired power
measured. 100 mW must be selected for any power above 10 mW.
Comp Mode (Read/Write)
Located SETUP
—
Instrument menu. Select the proper compensation mode. There are three
possible ambient temperature compensation modes available on the 1830A:
•
No Compensation
•
432 Compatible
•
432 Bias Comp
No Compensation
–
To be used with TEGAM thermistor mounts such as the F1130A.
The TEGAM thermistor mount is a type of bolometer whose resistance decreases as a
function of increasing heat associated with ambient temperature or applied power. This
system also features the Model 1830A temperature control circuitry that temperature
stabilizes TEGAM and Weinschel thermistor mounts. This eliminates changes in the
thermistor element's resistance due to ambient temperature changes and thus isolates the
causes of thermistor variation to the application of RF and DC power only. Therefore
compensation for ambient temperature is not needed.
432 Compatible and 432 Bias Comp
–
To be used with Agilent (HP) temperature
compensated thermistor mounts such as the 478A and 8478B.
432 Compatible
–
This mode assumes that a temperature-compensated mount is
attached. The diagnostic and error checking routines monitor both channels for errors, and
the voltmeter readings from both channels are combined using the same equation that
appears in the HP432 manual for making compensated power measurements using external
voltmeters. This mode introduces the uncertainty and noise of two channels, but can
compensate for significant environmental swings.
