HP TM 11-6625-2779-14&P - Manual (Page 41)

Model 3555B Section V
1. Reset the 654A output level for 0dBm
indication on the 3555B meter at a
frequency of 1kHz.
2. Check the frequencies listed in Table
5-5 for the tolerances indicated.
d. PROG FILTER RESPONSE
1.
Reset the 654A frequency to 1kHz and
adjust the output level for 0dBm
indication on the 3555B meter.
2. Check the frequencies listed in Table
5-5 for the tolerances indicated.
5-12. BRIDGING LOSS.
a.
Connect the equipment as shown in Figure
5-6 and set the 3555B controls as follows:
FUNCTION ............VF/Nm 600
INPUT................... TMS BRDG
RANGE .......................... 0dBm
b. Adjust the output of the 654A (600 ohm
function) for 0dBm indication on the 400FL
at a frequency of 1kHz.
c. Connect the 3555B to the 400FL input.
The indication on the 400FL should not
drop more than 0.3dB.
d. Change the FUNCTION switch to
CARRIER 600 and repeat the above
procedure at a frequency of 10kHz. The
400FL indication should not drop by more
than 0.05dB.
e. Change the equipment setup by connecting
a 300 ohm ±1% resistor in series with the
400FL input and change the resistor
connected across the 400FL input to 900
ohms
±
1%.
f. With the 400FL set to the 0dB range, adjust
the 654A output level for exactly 0dB
indication on the 400FL.
g. Change the 3555B FUNCTION to VF/Nm
900 and connect the 3555B input to the
400FL input terminals. The 400FL
indication must not drop by more than
0.3dB.
5-13. INPUT BALANCE.
a.
Set the 3555B controls as follows:
FUNCTION ............VF/Nm 600
INPUT................... TMS BRDG
RANGE .......................... 0dBm
b. Connect the 654A 600 ohm output to-the
tip and ring input of the 3555B. Set the
output frequency of the 654A to 60Hz and
adjust the amplitude control for 0dBm
indication on the 3555B meter.
c. Change the equipment setup to that shown
in Figure 5-7.
d. Change the 3555B RANGE switch to
-80dBm. The 3555B indication (meter +
RANGE setting) must be down at least
80dB.
e. Change the 3555B RANGE switch to
-70dBm and tune the 654A to 6kHz. The
3555B indication must be down at least
70dB.
f. Change 3555B RANGE to -60dBm and
tune the 654A to 20kHz. The 3555B
indication must be down at least 50dB.
g. Change the 3555B FUNCTION switch to
Figure 5-7. Input Balance Test Set-Up
5-7