Figure 2. Input attenuator accuracy (2.9 GHz)

TB 9-6625-2333-24

EXAMPLE:

(a) If the IF GAIN DEVIATION values in table 8 are:

REF LVL -30 dBm = +0.2 dB

REF LVL -20 dBm = -0.3 dB

(b) IF GAIN CORRECTION formula listed in table 9 is: [(-30)-(-20)] =

(c) Substitute table 8 IF GAIN DEVIATION values for REF LVL settings into formula:

[(-30)-(-20)] = [(+0.2)-(-0.3)] = +0.5

(d) Then +0.5 would be recorded as IF GAIN CORRECTION (dB) factor in table 9 for

ATTEN 20 dB setting. NOTE: Do not record EXAMPLE in table 9.

Table 9. Input Attenuator Accuracy (2.9 GHz)

Test instrument

' MKR

IF GAIN

ATTEN

Corrected

CORRECTION

settings

indications

Limits

(dB)

(rdB)

(dB)

10

0 (ref)

20

[(-30) - (-20)] =

0.6

30

[(-40) - (-20)] =

1.2

40

[(-50) - (-20)] =

1.8

50

[(-60) - (-20)] =

1.8

60

[(-70) - (-20)] =

1.8

70

[(-80) - (-20)] =

1.8

(25) Repeat (24) above for each remaining IF GAIN CORRECTION listed in table 9.

(26) Connect equipment as shown in figure 2.

Figure 2. Input attenuator accuracy (2.9 GHz) - equipment setup.

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