Agilent Technologies 8753ET User Manual page 81

Making Measurements
Measuring Amplifiers
Control of the external switch can be done through the test set interface on the rear panel.
Pin 8 on the TEST SET-I/O INTERCONNECT connector is a TTL 5 volt line that changes
from TTL high in the forward measurement state to TTL low in the reverse measurement
state. Refer to Figure 1-68 on page
connector's pins.
Pin 1 on the external switch must be grounded. It can be grounded to:
• the analyzer's chassis
• the front panel binder post
• the outer shell of the TEST SET-I/O INTERCONNECT connector
• a ground pin on the TEST SET-I/O INTERCONNECT connector (pin 7, 12 or 18). Refer
to Figure 1-68.
Pin C (common) on the HP/Agilent 8762B Option T24 must be connected to the test set
interface Pin 14 (+22 volt line). Pin 2 on the 8762B Option T24 connects to Pin 8 (TTL 0) on
the test set interface.
High Power Configuration Two
Figure 1-54 shows a full 2-port forward direction high power measurement. In this
configuration the maximum power from test PORT 1 and test PORT 2 is 0.10 watt or
20 dBm.
NOTE This is only an example configuration for high power applications. Actual
device values need to be determined for each individual application.
Figure 1-54 High Power Configuration Two
An external amplifier and coupler are connected between the RF OUT and the RF IN
access ports to the transfer switch.
The coupled arm of the external coupler must be connected to the R CHANNEL IN port.
Maximum recommended power to the R CHANNEL input is −10 dBm, so depending on the
coupling factor of the external coupler, an attenuator may need to be added to the R
CHANNEL path.
1-68
1-95. Table 1-5 on page 1-97 is a complete listing of the