SECTION II
CALIBRATION
5. Equipment Required. Equipment required for calibration performance checks and adjustment is listed in table 1.
NOTE
Minimum use specifications are the principal parameters required for performance of the
calibration and are included to assist in the selection of alternate equipment which may be used
at the discretion of the calibrating activity. Satisfactory performance of alternate items shall be
verified prior to use. All applicable equipment must bear evidence of current calibration.
Table 1. Equipment Required
Minimum use
Calibration
Military
Item
specification
equipment
equivalent
DC Voltmeter ............. 18 Volts, dc
John Fluke
ME-202/U
accuracy 1
Model 803B
percent
The calibration equipment utilized in this procedure was selected from those known to be available at Department of
Defense facilities. and the listing by make or model number carries no implication of preference, recommendation, or
approval by the Department of Defense for use by other agencies. It is recognized that equivalent equipment produced
by other manufacturers may be capable of equally satisfactory performance in the procedure.
NOTE
NOTE
The following paragraph is divided
It is recommended that personnel
into subparagraph a, performance
familiarize themselves with the entire
check,
and
subparagraph
b,
procedure
before
performing
adjustments. When the performance
calibration.
check is within tolerance do not
perform
the
corresponding
6. Preliminary Procedure. This section includes
adjustment. When the performance
instructions to prepare the unit under test for the
check is not within tolerance,
calibration procedures outlined in paragraph 7. The
perform
the
corresponding
preliminary operating procedure places the power
adjustment before continuing with
supplies (PS1 and PS2) in the unit under test in a
the calibration procedure. When the
turned-on condition. Verify the results of the following
performance check is not within
turn-on and take corrective action if the requirements
tolerance and the adjustment cannot
are not met, before proceeding.
bring it into tolerance, the deficiency
must be corrected before continuing
a. Operate unit under test 1 KHz and AF FREQ
with the procedure.
switches to OFF.
7. Power Supplies PS1 and PS2 Calibration.
b. Disregard settings of remaining switches and
controls.
a. Performance Check.
c. Operate POWER switch to ON.
(1) Connect dc voltmeter to test points on unit
under test front panel as noted in table 2.
d. Observe that POWER indicator illuminates and
fan motor operates.
(2) Observe that dc voltmeter indicates within
the limits specified in table 2.
Table 2. Power Supply Output Voltages
Dc voltmeter indication
Unit under test
(volts de)
Front panel
Power supply
test points
Minimum
Maximum
PS1 ............................. +18 VDC and GND ............................... +175 ......................................... +1K5
PS2 ............................. -18 VDC and GND ................................ -17.5 ......................................... -18
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