Echelon LONWORKS PLT-22, User Manual

Page: 97 / 128

• A "7 Ω load" circuit, as shown in figure 7.3, should be built in a suitable enclosure
and provided with an appropriate male AC mains plug. Note that the 1M Ω
resistor’s stand-off voltage should be greater than or equal to the peak line
voltage.
6.8ž ±5%, 1W
0.47µF ±10%, 250VAC (X2 type)
L
N
E
open
1Mž,
±5%,
1/4W
Figure 7.3 "7 Ω load" Circuit
• An impedance circuit shown in figure 7.4 should be built in a suitable enclosure
with bulkhead BNC jacks (AMP 413771-x or equivalent). This impedance circuit,
placed in series with the output path of a PLCA-22 analyzer, effectively increases
its output impedance. This will allow for a more sensitive measurement of the
receive mode impedance of the product under test.
88.7ž ±1%, 1/4W
Figure 7.4 Impedance Circuit Used For Excessive Loading Verification
• An attenuation circuit shown in figure 7.5 should be built in a suitable enclosure
with bulkhead BNC jacks (AMP 413771-x or equivalent). This attenuation
circuit, or "pad", will provide approximately 60dB of attenuation when connected
into the receive performance verification set-up of figure 7.9.
30.1kž ±1%, 1/4W
Figure 7.5 Attenuation Circuit Used For Receive Performance Verification
L
ON
W
ORKS
PLT-22 Transceiver User’s Guide 7-5