Preventive Maintenance
Site Master preventive maintenance consists of cleaning the unit and inspecting and clean-
ing the RF connectors on the instrument and all accessories.
Clean the Site Master with a soft, lint-free cloth dampened with water or water and a mild
cleaning solution.
CAUTION:
To avoid damaging the display or case, do not use solvents or abra-
sive cleaners.
Clean the RF connectors and center pins with a cotton swab dampened with denatured alco-
hol. Visually inspect the connectors. The fingers of the N (f) connectors and the pins of the
N (m) connectors should be unbroken and uniform in appearance. If you are unsure whether
the connectors are good, gauge the connectors to confirm that the dimensions are correct.
Visually inspect the test port cable(s). The test port cable should be uniform in appearance,
not stretched, kinked, dented, or broken.
Calibration
The Site Master is a field portable unit operating in the rigors of the test environment. An
Open-Short-Load (OSL) calibration, InstaCal calibration, FlexCal calibration with
open-short-load, or FlexCal calibration with an InstaCal module should be performed prior
to making a measurement in the field (see Calibration, page 3-2). A built-in temperature
sensor in the Site Master advises the user when the internal temperature has exceeded a
measurement accuracy window, and the user is advised to perform another calibration in or-
der to maintain the integrity of the measurement.
NOTES:
For best calibration results—compensation for all measurement uncertain-
ties—ensure that the Open/Short/Load is at the end of the test port or optional
extension cable; that is, at the same point that you will connect the antenna or
device to be tested.
For best results, use a phase stable Test Port Extension Cable (see Optional
Accessories). If you use a typical laboratory cable to extend the Site Master test
port to the device under test, cable bending subsequent to the OSL calibration
will cause uncompensated phase reflections inside the cable. Thus, cables
which are NOT phase stable may cause measurement errors that are more pro-
nounced as the test frequency increases.
For optimum calibration, Anritsu recommends using precision calibration com-
ponents.
1-9
Chapter 1 General Information
