4-2
Bench Testing
SLE*-* Installation and Operation Manual
PRELIMINARY - Motorola Internal Use Only
Test Equipment and Connections
The equipment typically used for testing the SLE*-* consists of a network analyzer such as the
HP 8712 or 8713 series, a 60/90 VAC bench power supply, a cable simulator, a Motorola model
SSP-PIN power combiner, and a variety of jumper cables, adapters, and fittings.
CAUTION!
To protect the network analyzer and sweep comparator, you must configure the SSP-PIN power combiner to block AC
power from the input port.
Fabricate a cable simulator that you can configure to provide the desired cable loss in 1 dB
increments up to approximately 30 dB. Then, connect the test equipment as shown in
Figure 4-1:
Figure 4-1
Test equipment connections for bench sweeping
Network
analyzer
SLE*-*
under test
Cable
simulator
Power
combiner
117
VAC
AC power
supply
60/90 VAC
Sweep
input
Sweep
output
CAUTION!
Before you begin the following subsection, remove the input pad,
JXP
-
IN
, to avoid damage to the hybrids before you
apply power.
Measuring Forward Gain
This subsection provides instructions for measuring the full gain and the operational gain and
flatness of the SLE*-*.
To measure the full gain of the amplifier:
1
Connect the SLE*-* to the test equipment as illustrated in Figure 4-1 and apply power.
2
Verify that the DC voltage is 24 V
±
0.4 V and re-install the input pad.
3
Apply the sweep signal and adjust test equipment as needed.
4
Select manual gain by placing the drive control select jumper in the
MAN
position and turn
the
MANUAL LEVEL
control (Figure 2-8) fully clockwise.