HP TM 11-6625-2779-14&P manual Input Balance, Bridging Loss, Input TMS Brdg, 3555B Range

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

Figure 5-7. Input Balance Test Set-Up

5-7