Operating Instruction
849x and 1158x Operating and Service Manual
13
2. Set the test oscillator to 0.3 Vrms at 1 kHz.
3. Set the SWR meter range to 2 dB (expanded) or for the 3 dB, 6 dB, and
10 dB (expanded) as appropriate and adjust its bandwidth to the center
of the adjustment range. Fine tune the oscillator frequency to obtain
maximum meter indication. Adjust the oscillator output to obtain the
SWR meter reading in the table below.
4. Connect the attenuator into the system, adjust the SWR meter range
switch as listed in
, and verify that the SWR meter indicates
within the limits as shown
Table 11
SWR Verification
Attenuation (dB)
SWR Meter
Range (dB)
Meter Indication (dB)
Minimum
Actual
Maximum
0 (System Cal)
2 (or 10)
1
1. Set SWR meter range to 10 dB and power level to 0.0 dB for 3 dB, 6 dB, and 10 dB
attenuators only.
Set to 0.5 (or 0.0)
1
3
10
1.35
1.65
6
12
0.85
1.15
10
14
0.75
1.25
20
12
0.25
0.75
30
16
1.00
2.00
40
22
−
0.25
1.25
50
26
0.75
2.25
60
32
−
0.50
1.50