Section IV. CALIBRATION

TB 11-6625-2836-35

7. Preliminary Procedures a. Open TI and carefully remove inner chassis from the case.

b. Place the inner chassis on a nonmetalic working surface.

c. Energize TI and allow sufficient time for warmup and stabilization.

NOTE

Unless otherwise specified, verify the results of each test and take

corrective action whenever the test requirement is not met before

continuing with the calibration.

Section IV. CALIBRATION

8. Peak Negative Voltage. a. Performance Check.

(1) Connect multimeter (Al) between TI TP 1 (fig. 1) and chassis ground.

(2) Observe that the indication on the multimeter is between -6.0 and -6.5 or slightly greater. If not, perform b(l)

below.

(3) Connect multimeter between TP 2 and ground.

(4) Observe that the indication on the multimeter is between - 6.0 and -6.5 or slightly greater. If not, perform b(2)

below.

b. Adjustments

(1) Tune TI coil L3 for a maximum negative voltage. (R)

(2) Tune TI coil L4 for a maximum negative voltage. (R)

NOTE

The most negative reading will usually be obtained at the peak with the

coil tuning slug furthest out. If any components in the TI have been

replaced, coils L1, L2, L3, and L4 should be retuned. Tank circuit coils

L3 and L4 are to be tuned to produce maximum negative readings at TP

1 and TP 2. Output coils L1 and L2 are tuned for maximum output.

9. Final Procedure. a. Deenergize and disconnect all equipment and reinstall TI in protective cover.

b. In accordance with TM 38-750, annotate and affix DA Label 80 (US Army Calibrated Instrument). When the TI

receives limited or special calibration). When the TI cannot be adjusted within tolerance, annotate and affix DA Form

2417 (US Army Calibration System Rejected Instrument).