NARDA 8718B - Manual (Page 5)

4 Operating the Meter
Probe Connection
To make measurements, you must use your
Model 8718B with a compatible probe. Connect
the cable of the probe to the probe connector
located at the top of the unit.
If you use a fiber optic link, the probe connects to a
fiber optic transmitter. A fiber optic cable connects
the transmitter to the rectangular fiber optic jack on
the left side of the meter.
Audio Alarm
Your Model 8718B is equipped with an audible
alarm that emits sound through a tiny hole on the
bottom of the meter. The alarm sounds whenever
the field strength exceeds the measurement range
of the probe (over ranges).
You can also set the meter to sound its alarm at a
specific level and/or turn on a variable-tone mode.
Probe Test Sources
Your Model 8718B is equipped with two RF
sources for testing your probes. The Test Source
key will turn these sources on. They will stay on for
approximately 20 seconds.
A microwave (waveguide) window on the right side
of the probe is used for testing high frequency
probes.
A contact on the right side of the meter is used for
testing low frequency probes. Most probes have
three test points on the head of the probe.