Ohms Adjustment; Acv Adjustments - HP 3456A Operating And Service Manual

Adjustments
5·15.

OHMS ADJUSTMENT.

5-16. Equipment Required.
Standard Resistors:
±
K
ohm .0005070
9330A/l K)
10 K ohm .001 %
±
9330AllOK)
100 K ohm .001 % (Guildline 9330/ 100K or
±
9330A/1OOK)
1 M ohm .002% (Guild line 9330/1M)
±
10 M ohm .01 % (Guild line 95206)
±
5-17. Adjustment Procedure.
a. Press the 3456A's RESET button and set the in­
strument to the 6 Digit Display and 4-Wire Ohms con­
figuration.
b. Connect the 10 K ohm Standard Resistor to the
3456A 's input terminals. Adjust calibration pot "F" for
± I
a 10.00000 3 count reading. Disconnect the Stan­
+
dard Resistor.
NOTE
The Standard Resistors are connected in the
4-
Wire con f iguration, as shown in Figure
5-4.
RATlO REF
4'o1R
n SENSE
STANDARD
RESISTOR
Figure 5·4. Standard Rasistor Connection.
c. Connect the 1 K ohm Standard Resistor to the in­
put terminals. Adjust calibration pot "G"
±
1000.000 1 count reading. Disconnect the Standard
Resistor.
d. Connect the 100 K ohm Standard Resistor
input terminals. Adjust calibration pot "H"
+
100.0000 3 1 count reading. Disconnect the Stan­
±
dard Resistor.
e. Connect the 1 M ohm Standard Resistor to the in­
put terminals. Adjust calibration pot
-3 1 count reading. Disconnect the Standard Resistor.
±
5·4
(Guildline 9330/ l K or
(Guildline 9330/ l O K or
VOl IS
"AA
"AA
GUARD
IQ]
1056·5-4
for a
the
10
for a
" I" for a 1000.000
f. Connect the 10 M ohms Standard Resistor to the
input terminals . Adjust calibration pot
±
10.000<XJ 6 4 counts reading. Disconnect the Stan­
+
dard Resistor. This completes the Ohms Adjustments.
5·18.

ACV ADJUSTMENTS.

5-19. Equipment Required.
AC Calibrator (Fluke Model 5200A)
5-20. Adjustment Procedure.
a. Press the 3456A's RESET bunon and set the in­
strument to the ACV fuction.
b. Set the AC Calibrator for a
connect it to the 3456A's VOLTS input terminals.
c. Set the 3456A to the 100 V range and adjust the in­
strument's calibration pot "K" for a 0 1 . 000
reading.
d. Set the 3456A to the
tion pot "L" for a 1 .00000
e. Set the 3456A to the 1000 V range and adjust either
"N"
calibration pot "M" or
reading.
f.
Repeat Steps c, d, and e in the given order until all
the readings are within the limits.
NOTE
"K", "L",
Calibration pots
interact with each other and should be ad­
justed until the readings converge.
g. Disconnect the AC Calibrator from the 3456A.
Short the 3456A's input terminals.
h. Set the 3456A to the ACV
V range. Adjust calibration pot
reading.
i. Set the 3456A to the ACV function and do the
following:
1 . Note the 3456A's displayed reading.
2. Adjust calibration pal
reading.
3. Continue adjusting calibration pot "M" in the
same direction until the reading noted in Step 1 is
reached (within 2 counts).
±
j . Repeat Steps h and i until both readings converge
±
with each other (within
Model 3456A
"J"
for a
I
V, I kHz output and
± I
count
I
V range and adjust calibra­
±
3 counts reading.
±
for a 001.00 2 counts
N"
and " M or
+ DCV function and the
"N"
for a minimum
"M" for a minimum
2 counts).
)