Table of Contents
Advertisement
Transmitter Level Accuracy
a)
Set the LT51 to TX-RX interface mode. Set the TX frequency to 10 kHz.
b)
Set the LT51 Ztx impedance and TX level as indicated in Table 8.1 below.
c)
Connect a suitable DMM to the LT51 using a short low capacitance cable to
the TXa-b terminals.
d)
The DMM must be terminated with the indicated impedance at its input
terminals.
e)
Step down the levels in Table 8.1 and check that the readings are within the
ranges specified.
LT51 Tx Level
0 dBm
0 dBm
0 dBm
+10 dBm
-10 dBm
-20 dBm
-30 dBm
-40 dBm
-50 dBm
Transmitter Level Response
a)
Set the LT51 to TX-RX interface mode. Set the TX level to 0.0 dBm.
b)
Set the LT51 Ztx impedance and TX frequency as indicated in Table 8.2
c)
Connect a terminated DMM / Thermal Voltage Converter to the LT51 using
a short, low capacitance cable to the TXa-b terminals.
d)
With the TX Frequency set to 10 kHz, set the reference on the DMM / TVC.
All subsequent readings will displayed relative to the reading at 10 kHz.
e)
Step down the frequencies in Table 8.2 and check that the readings are
within the ranges specified.
LT51 Tx Freq
10 kHz
2 kHz
200 kHz
1,000 kHz
2,000 kHz
10 kHz
200 Hz
20 kHz
LT51 User Manual
LT51 Ztx
75
50
600
600
600
600
600
600
600
Table 8.1
LT51 Ztx
75
75
75
75
75
600
600
600
Table 8.2
Performance Testing
DMM reading
0 dBm ± 0.05 dB
0 dBm ± 0.05 dB
0 dBm ± 0.05 dB (ref.)
+10 dBr 0.20 dB
-10 dBr 0.20 dB
-20 dBr 0.20 dB
-30 dBr 0.30 dB
-40 dBr 0.30 dB
-50 dBr 0.30 dB
DMM reading
0 dBm ± 0.05 dB (ref.)
0 dBr 0.25 dB
0 dBr 0.25 dB
0 dBr 0.5 dB
0 dBr 0.5 dB
0 dBm ± 0.05 dB (ref.)
0 dBr 0.25 dB
0 dBr 0.25 dB
82
Advertisement
Table of Contents
