Specifications

NOTE
When measuring RF Amplifier drain waveform, the amplifier to
be measured must be turned “ON” to give a correct measure-
ment. There will be no drain waveform from an “OFF” ampli-
fier. LED indicators DS3 will illuminate GREEN when an ampli-
fierison.
NOTE
For maximum protection of personnel it is recommended to use
the scope probe (610-1131-000) or equivalent X10 scope probe
to access this point since the long tip will reach through the air
slots in the inner door.
a. Connect the probe to the scope set up to measure an RF
waveform at approximately 230Vp-p, and ensure that the
scope case is properly grounded.
b. Connect the ground clip of the probe to the edge of the
inner front door of the transmitter nearest to the RF
Amplifier being measured.
c. With the insulated extended tip securely fastened to the
X10 scope probe, insert the tip of the probe through the
rectangular cutout and touch TP1 which is located in front
of the heatsink.
d. Make the measurement while holding the scope probe tip
on TP1 and be careful not to touch other parts of the
circuit.
e. Make the same measurement on TP2.
6.10.2
Measuring RF Drain Phasing
Remember that there are two sections of each RF Amplifier
module and each has an individual drive signal fed into it.
Measure the RF Drain Phase using the same procedure and
precautions as above.
a. Scope Setup - set the scope on AC coupled, 50V per
division, and the trace is centered on the screen.
b. Measure RF Drain Phase using the same procedure found in
paragraph “Measuring RF Drive Phasing” in this section.
888-2339-002 6-23
WARNING: Disconnect primary power prior to servicing.