TB 9-6625-2185-24
(12) Utilizing formula below, convert power recorded in (11) above to dBm.
(13) Algebraically add actual value of 20 dB attenuator (p/o TI) and dBm value from
(12) above as in example below:
Example:
Attenuator value (+19.75) + (-5.02) dB = +14.73
Record this value.
(14) Disconnect cable from input of amplifier and connect equipment as shown in
figure 2, CONNECTION B.
(15) Reconnect cable to input of amplifier. If display does not indicate power
recorded in (13) above 0.18 dBm, perform b (32) through (51) below, and (52) through (54)
for (16) below.
(16) Repeat technique of (9) through (15) above for a power level of +5 dBm in
(10) above.
b. Adjustments
NOTE
Due to inability to distinguish between dc and sensor
inaccuracies, perform paragraph 10, Dc Instrumentation
Accuracy, before performing adjustments below.
NOTE
Adjustments below are actually alterations to data stored in
nonvolatile memory of TI.
ZERO
(1) Disconnect sensor from synthesizer/level generator
and
press
pushbutton twice. Wait for the TI to complete the zero cycle.
(2) Press pushbuttons as follows: 1, SELECT CHNL, 1, SELECT SENS, 0, CAL
FAC dB, 0, REF LVL dB.
NOTE
If sensor number is not 1 as indicated on sensor label, change
accordingly. Example: 2, SELECT SENS.
(3) Set control board bit switches to CALIBRATE MODE 1 (DC CAL) (fig. 3).
(4) Press pushbuttons 2, CAL FAC GHz, 1000, CAL FAC dB.
(5) Press pushbuttons for the last four digits of sensor serial number, dB LIMITS
HI, 1000, and RANGE AUTO.
10