Performance Testing
LT51 User Manual
83
Receiver Level Accuracy
a) Set the LT51 to Level Spectrum and TX-RX interface mode
b) Set the LT51 Zrtx impedance to terminated and the appropriate value in the
table.
c) Connect a Level Oscillator (with the correct level for each impedance) to the
LT51 using a short low capacitance cable to the RTXa-b terminals.
d) Set the Oscillator frequency to 10 kHz and Level to 0 dBm.
e) Step down the levels in Table 8.3 and check that the readings are within the
ranges specified.
Oscillator Tx Level
Impedance
LT51 reading
0 dBm
50
0 dBm ± 0.10 dB
0 dBm
75
0 dBm ± 0.10 dB
0 dBm
600
0 dBm ± 0.05 dB (ref)
+10 dBm
600
+10 dBr
0.20 dB
-10 dBm
600
-10 dBr
0.20 dB
-20 dBm
600
-20 dBr
0.20 dB
-30 dBm
600
-30 dBr
0.30 dB
-40 dBm
600
-40 dBr
0.30 dB
-50 dBm
600
-50 dBr
0.30 dB
Table 8.3
Receiver Level Response
a) Set the LT51 to Level Spectrum and TX-RX interface mode
b) Set the LT51 Zrtx impedance to 50
, terminated.
c) Connect a 50
Level Oscillator to the LT51 using a short low capacitance
cable to the RTXa-b terminals.
d) Set the Oscillator level to 0 dBm and Frequency as indicated in Table 8.4.
e) With the Oscillator Frequency set at 10 kHz, set the reference on the LT51.
Set the Marker to the peak and press the
Zero Offset
[f3] key.
f)
Step down the frequencies in Table 8.4 and check that the readings are
within the ranges specified.
Oscillator Tx Frequency
LT51 reading
10 kHz
0 dBm ± 0.05 dB (ref)
200 Hz
0 dBr
0.25 dB
1 kHz
0 dBr
0.25 dB
200 kHz
0 dBr
0.25 dB
1,000 kHz
0 dBr
0.50 dB
2,000 kHz
0 dBr
0.50 dB
Table 8.4
Summary of Contents for UMDT51A
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