TB 9-6625-2185-35
(35) Using calculator and formula below, convert P2 to dBm. Record dBm value.
(36) Algebraically add actual value of 20 dB attenuator (p/o TI) and dBm from (35)
above. Record this as actual power.
(37) Disconnect cable from input of amplifier and connect equipment as shown in
figure 2, CONNECTION B.
(38) Reconnect cable to input of amplifier. If display does not indicate actual
power from (36) above 0.12 dBm, subtract display indication from actual and record
difference as dB error. If display indicates within tolerance, proceed to (45) below.
(39) With power level still set and connected to sensor, set control board bit
switch to CALIBRATE MODE 2 (AC CAL) (fig. 3).
(40) Press pushbuttons 5, RANGE HOLD, and REF LVL dB. Record display
indication as upscale gain factor for range 5.
(41) Using technique, of (28) above and dB error in (38) above and gain factor in
(40) above, calculate a new gain factor.
(42) To enter new gain factor press pushbuttons 5, RANGE HOLD, XXXX, and
REF LVL dB.
NOTE
XXXX = New gain factor in (41) above.
(43) Set control board bit switch to OPERATE MODE (fig. 3).
(44) If display does not indicate actual power from (36) above 0.12 dBm, repeat
(33) through (43) above.
(45) Position level generator controls for -86 dBm output and disconnect amplifier
from setup. Connect sensor to level generator 50Ω output.
(46) Position level generator controls for +10 dBm output. If display does not
indicate between +9.92 to +10.08 dBm, perform (47) through (51) below. If within
tolerance proceed to (52) below.
(47) Set control board bit switch to CALIBRATE MODE 2 (AC CAL) (fig. 3).
(48) Press pushbuttons 5, RANGE HOLD, dB LIMITS HI. Note downscale
correction on display.
(49) Increase or decrease downscale correction by 5 to 10 counts according to error
in (46) above, ((38) above for range 6).
(50) Press pushbuttons 5, RANGE HOLD, (new downscale correction), dB
LIMITS HI.
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