HP TM 11-6625-2779-14&P Filter Response Checks, MSG dBm 3kHz Flat dBm 15kHz Flat dBm Program dBm

Section V Model 3555B

Figure 5-6. Bridging Loss Test Set-Up

j.Change the bridge resistors in Figure 5-4to 135 ohms +0.1% and change the 3555B FUNCTION to 135 BAL. Check the return loss between 1kHz and 600kHz. The return loss must be better than 26dB down from the reference.

k.Change the 3555B input connection to the 75 UNBAL jack. Change the resistors in Figure 5-4to 75 ohms +0.1% and change the 3555B FUNCTION to CARRIER 75 UNBAL.

l.Check the return loss between 1kHz and 3MHz. The return loss must be better than 30dB down from the reference.

5-11. FILTER RESPONSE CHECKS.

a.C MSG FILTER RESPONSE

1.Connect the equipment as shown in Figure 5-5with S1 in position 1 and set the 3555B controls as follows:

FUNCTION......... VF/Nm 600 INPUT ............ NOISE BRDG RANGE ....................... 0dBm

2.Adjust the output of the 654A for 0dBm at a frequency of 1 kHz.

3.Check the frequencies listed in Table 5-5for the tolerances indicated.

b.3kHz FLAT FILTER RESPONSE

1.Set the 654A frequency to 1kHz and adjust the output level for 0dBm.

2.Check the frequencies listed in Table 5-5for the tolerances indicated.

c.15kHz FLAT FILTER RESPONSE

Table 5-5. Filter Response Checks

FREQUENCY	C MSG (dBm)		3kHz FLAT (dBm)	15kHz FLAT (dBm)	PROGRAM (dBm)
60Hz	-55.7 ±2		0 ±1.75	0 ±1.75
200Hz	-25 ±2				-17.3 ±2
250Hz			0 ±1	0 ±1
500Hz	-7.5 ±1				-6.6 ±1
1kHz	0(Ref)		0(Ref)	0(Ref)	0(Ref)
2kHz	-1.3	±1	-0.5 ±1.75		4.8	±2
2.5kHz	-1.4	±1	-1.5 ±2
3kHz			-3 ±3		+6.5	±2
4kHz	-14.5	±3			+6.5	±2
5kHz	-28.5	±3		0 ±1	+6.5 ±2
6kHz					+6.4	±3
8kHz					+4	±3
10kHz				-0.5 ±1.75	-8.5 ±4
12.5kHz				-1.5 ±2
15kHz				-3 ±3

5-6