TEST PROCEDURES
46882/439 7-7
Attenuator accuracy
The following test will confirm that the attenuator performs to the published performance
specification. In the event of the receiver/down-converter not being available, an alternative
method to functionally test the individual pads is also suggested. (See ‘Alternative attenuator
functional test’)
Test procedure
2041
Signal Generator
UUT
RF
OUTPUT
RF
OUTPUT
RF LO
Frequency offset
mode connection
C3493
Measuring
receiver
Down convertor
Sensor
Fig. 7-2 Attenuator accuracy test set-up
(1) Connect the test equipment as shown in Fig. 7-2.
(2) On the UUT set source A to:
[Carrier Freq] 2.6 [MHz]
[RF Level] 0 [dB]
[Total
Δ
]
[RF Level Shift] 11 [dB]
(3) Tune the receiver to 2.6 MHz and record the output level measured in Table 7-8 checking
th
at the result is within specification.
(4) Set the UUT RF level to −4.1 dBm. Measure the received level and record the result in
Table 7-8 checking that the result is within specification.
(5)
Decrement the UUT, using the [÷10 ⇓] key, in 11 dB steps down to an RF level of
−114.1 dBm measuring the received level at each step shown in Table 7-8. Check that the
resu
lts are within specification.
(6) Set the UUT to carrier frequency 540.1 MHz and repeat (2) to (5) using Table 7-9.
(7)
Set the UUT to carrier frequency 1140.1 MHz and repeat (2) to (5) using Table 7-10.
(8
) Set the local oscillator to +8 dBm at a carrier frequency of 62 MHz less than the test
frequency (that is, a frequency of 1678.1 MHz).
The down converter is automatically enabled when testing frequencies above 1300 MHz.
(9) On the receiver, enter the local oscillator frequency followed by the test frequency.
(10) Set the UUT to carrier frequency 1740.1 MHz and repeat (2) to (5) using Table 7-11.
(11)
Set the UUT to carrier frequency 2399 MHz and repeat (2) to (5) using Table 7-12.
(1
2) Repeat (2) to (11) for source B and, if Option 1 is fitted, source C.
To Next Page
Loading...
General