CALIBRATION
The following instruments or their equivalents are required to perform calibration of the DAC board.
Calibration
is
required every six months or after the board has been repaired.
ZERO OFFSET CALIBRATION
BRAND
Fluke
1. Turn on the counter with no input, so that the display shows all zeros.
2.
PUSH
Rmm
MODEL
8050A
3. Connect digital volt meter to the rear DAC output.
4. Adjust R6 to reach 0.000 volts on the DVM display.
TYPE
DVM
FULL SCALE CALIBRATION
SPEC1 FlCATlONS
4
%
digit resolution
1. Short TP3 to TP4.
2.
Adjust R4 to reach 1.000 volts on the DVM display.
3.
Remove the short.
The calibration for the DAC board
is
complete.
PERFORMANCE TESTS
Refer to the instruments table in Calibration for the required test equipment.
Connect the DVM to the DAC output (rear panel). Connect rear 10 MHz output to Band 1 input.
BAND
RESOL
ENTER
:
n
0
a
Display shows 10.000 0 MHz.
ACCURACY TEST
D
AC
ENTER
:
(
DVM should read OflmV.
FREQ
MHz
ENTER
:
n
[TI
WJ
1-1
DVM should read 0.999f 0.006 V.
OFFSET
Repeat the second test in accuracy for entries between .888 and
.Ill.
DVM should read the entry
f
1 mV
+
0.5
%
of entry.
Scans by ArtekMedia © 2007
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