Fluke 8050A - 4-54. RMS Converter Offset Adjustment

MAINTENANCE
CALIBRATION ADJUSTMENTS
Table 4-10. US Jumper Positions
DISPLAY
JUMPER CONFIGURATION
(ALL JUMPER PINS INSTALLED)
AS VIEWED FROM REAR OF 8050A
. ... ...
&& & ....
&&
~
. . .
~
...
+
..
+
.. ...
~
LOW
HIGH
D
c
B
A
I
I
I
I
I
1.8773
1.8879
t
~
t t
+
I
I
I
I
I
1.8667
1.8772
+
t
t
t
I
I
I
I
I
I
1.8562
1.8666
t
f
t
~
t
I
I
I
I
I
1.8459 1.8561
t
f
t
I
I
I
I I
I I
1.8356
1.8458
t
t ~ f
t
I I
I
I
I
1.8255 1.8355
+
t
t
t
I
I
I
I
I
I
1.8155
1.8254
t
t
I
t
t
I
I
I I
I
1.8056 1.8154
~
t
I
I
I
I
I
I
I
1.7958
1.8055
~
f
i
+
I
I I
I
1.7861 1.7957
t
f
t
I
I
I I
I
1.7765
1.7860
t
t
t
t
I
I
I I
1.7670 1.7764
t
t
I
I
I I
I
I
1.7576
1.7669
I
t t
+
I
I
I
I
1.7483
1.7575
I
I
t t
I
I
I
I I
I
1.7391
1.7482
I
I
I
+
t
1.7300
1.7390
NO JUMPER INSTALLED
SELECTABLE JUMPER CONFIGURATION
FOR DC CALIBRATION (VOLTAGE REFERENCE VRl
CALIBRATION NETWORK, U5).
9. Perform the Calibration Adjustments.
4-54.
RMS CONVERTER OFFSET ADJUSTMENT
PROCEDURE
4-55. The rms converter offset adjustment should be
performed if R29 does not have a sufficient adjustment
range or if the 8050A display reading
is greater than .0040
in step 3 of Table 4-9. Use the following procedure to set
the initial offset of the RMS Converter:
I. On the 8050A, set the POWER switch to ON.
2. Select the AC V function, 2V range.
3. Connect the DMM Calibrator to the 8050A as
follows: HI to the V /kO./S input connector and
LO to the COMMON input connector.
4. Adjust the DMM Calibrator for l.OOOOV ac
rms,
at 400Hz.
5. Turn on the DMM Calibrator.
6. With the DMM, measure the voltage at pin 7 of
the RMS Converter with reference
to ground
(TPl). This voltage must be
O.OV ± 20 mV.
Record this voltage to the nearest 0.1 m V. If the
4-11
--1