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Electrical Zero and Stability
Figure 2. Range and linearity - equipment setup.

Calibration Proceudre For Clip-On Milliammeter, Model 428A And 428B- Page Navigation
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TB 9-6625-1188-24
(6) Insert probe head into degausser at rear of TI (front of TI if rack-mounted) with
arrow on probe pointing in same direction as arrow on chassis.
(7) Press pushbutton S3 (fig. 1) to energize degausser.
Figure 1. Dc milliammeter - right-side view.
(8) While pressing degausser pushbutton, withdraw probe slowly from degausser for
first few inches and then normally until probe is withdrawn about 1 foot.
(9) Repeat a (1) through (4) above.
9. Range and Linearity
a. Performance Check
(1) Connect equipment as shown in fig. 2, Connection A.
NOTE
Zero meter after changing ranges.  Probe jaws must be
completely closed when performing checks.
(2) Set RANGE switch to 3 MA.
(3) Adjust calibrator controls until meter indicates 3. If calibrator does not indicate
between 2.81 and 3.19 mA dc, perform b below.
(4) Repeat technique of (2) and (3) above, using values and indications listed in table 4.
5


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