TB 9-6625-1947-35
12. Output Attenuator Accuracy
a. Performance Check
(1) Connect true rms voltmeter to UNBAL output connector, using a 50 Ω feed-
through termination.
(2) Position controls as listed in (a) through (e) below:
(a) FREQUENCY dial to 3.
(b) FREQUENCY RANGE switch to X100K.
(c) OUTPUT LEVEL switch to +10 dBm.
(d) Press IMPEDANCE 50 Ω UNBAL pushbutton.
(e) AMPLITUDE control to +0 dBm.
(3) True rms voltmeter will indicate between +9.85 to +10.15 dBm.
(4) Repeat technique of (2) and (3) above for settings and indications listed in table 7.
True rms voltmeter will indicate within specified limits.
Test instrument
True rms voltmeter indications
OUTPUT LEVEL
(dBm)
switch settings (dBm)
Min
Max
0
-0.15
+0.15
-10
-9.85
-10.15
-20
-19.85
-20.15
-30
-29.85
-30.15
-40
-39.85
-40.15
-50
-49.85
-50.15
-60
-59.85
-60.15
-1
-0.85
-1.15
-2
-1.85
-2.15
-3
-2.85
-3.15
-4
-3.85
-4.15
-5
-4.85
-5.15
-6
-5.85
-6.15
-7
-6.85
-7.15
-8
-7.85
-8.15
-9
-8.85
-9.15
b. Adjustments. No adjustments can be made.
13. Power Supply
a. Performance Check
NOTE
Do not perform power supply check if all other parameters are
within tolerance.
