HP 3478A Technical Manual page 46

3478A 3478A
4-82. Calibration 4-82. Calibration Messages Messages
4-83. When calibrating 4-83. When calibrating the
may be displayed by may be d isplayed by the multimeter. the multimeter. The following lists
the messages and also gives information on what to do if the messages and also gives information on what to do if
a certain message is displayed. a certain message is displayed.
a. a. UNCALIBRATED - - When UNCALIBRATED
displayed, calibrate the displayed, calibrate the 3478A.
shows up during a Self-Test routine and indicates that shows up during a Self-Test routine and indicates that
the calibration RAM has an incorrect checksum. the calibration RAM has
b. b. ENABLE CAL ENABLE CAL - This message shows - This message shows that the
panel CAL ENABLE switch is not in the enable position panel CAL ENABLE switch is not in the enable position
(the slot of the switch is horizontal) when attempting to (the slot of the switch is horizontal) when attempting to
calibrate the calibrate the multimeter. multimeter. Make sure the
correct position, when attempting to calibrate. correct position, when attempting to calibrate.
c. c. CAL ABORTED - The CAL ABORTED - The 3478A display
when an invalid pushbutton was pressed (e.g., the SRQ when an invalid pushbutton was pressed (e.g., the SRQ
button), an overload is detected, or an A/D error is button), an overload is detected, or an A/D error is
detected. detected. This can only This can only be true
after pressing after pressing the CAL the CAL button).
button is pressed, the calibration source is at the correct button is pressed, the calibration source is at the correct
value, and the 3478A is operating correctly. value, and the 3478A is operating correctly.
d. d. VALUE ERROR - This VALUE ERROR - This message is displayed
the following conditions are true. the following conditions are true.
1. 1. A zero A zero calibration is att calibration is attempted and th
reads a value of greater than ± 1000 counts (e.g. reads a value of greater than ± 1000 counts (e.g.
reads I ohm on the 30 ohm range). reads I ohm on the 30 ohm range).
2. 2. A full A full scale or 1 scale or 1/3 scale
attempted in the DC Volts Function with a negative attempted in the DC Volts Function with a negative
input volt input voltage. age. Make sure the Make sure the input voltage
positive, when calibrating the DC Volts Function. positive, when calibrating the DC Volts Function.
3. 3. A full scale o A full scale or 1/3 scale r 1/3 scale calibration is at
outside the available r outside th e available range (great
example, example, an an attempt attempt is is made
with a with a value of value of +3.21V or +3.21V or +2.79V
Make Make sure the sure the calibration calibration source
specified range, when calibrating at full scale and 1/3 specified range, when calibrating at full scale and 1/3
scale. scale.
4. 4. An AC Volt An AC Volts calibration s calibration is attempted
applied calibration source is other than 3V ac. Make applied calibration source is other than 3V ac. Make
sure the calibration source is correct (3V at 1KHz). sure the calibration source is correct (3V at 1KHz).
e. e. ACI ACI VAL ERR VAL ERR - The
message when it is unable to calculate an AC Current message when it is unable to calculate an AC Current
calibration constant, after doing the AC Volts Calibration. calibration constant, after doing the AC Volts Calibration.
This condition can exist if the calibration constant for the This condition can exist if the calibration constant for the
DC Current DC Current Function is Function is invalid.
and 3A Range in the DC Current Function is correctly and 3A Range in the DC Current Function is correctly
calibrated. calibrated.
f. f. CAL FI CAL FINISHED - NISHED - A calibrat
the 3478A, 3478A, certain certain messages messages
The following lists
When this this message message is is
3478A. The message n The message normally
an incorrect checksum.
that the front
Make sure the switch is in switch is in the
3478A displays this message s this message
be true during calibrat during calibration (i.e.,
button). Make sure t Make sure the correct he correct
message is displayed when
empted and the 3478A
/3 scale (gain) calibrat (gain) calibration is
input voltage is always is always
calibration is attempted
ange (greater than er than ±7%). ±7%). For
made to to calibrate calibrate the the 3478A
+2.79V (greater (greater than than :t:7%).
source is is within within the
is attempted when the when the
- The multimeter d multimeter displays isplays this
invalid. Make sure t Make sure the 300mA he 300mA
A calibration cy ion cycle has cle has been
successfully completed. successfully completed.
g. g. CALIBRATING - CALIBRATING - Calibration in
4-84. 4-84. Calibration
4-85. 4-85. Each step in
themselves must be done in the order they are given. themselves must be done in the order they are given.
ormally Each Each
Performance Test. The Performance Performance Test.
ignored, if so desired. ignored, if so d
will meet its full scale 24 Hour limits, the Performance will meet its full scale 24 Hour limits, the Performance
front Test for full scale (or in some cases 1/3 scale) and zero Test for full scale (or in some cases 1/3 scale) and zero
inputs are not included. inputs are
normally calibrated using full scale (or 1/3 scale) and normally calibrated using full scale (or 1/3 scale) and
the zero inputs. The Calibration and Performance Test zero inputs. The Calibration and Performance Test
Procedures are separated as follows: Procedures are separated as follows:
a. a. DC Volts DC Volts Calibration and
b. b. DC Current DC Current Calibration and
c. c. AC Volts AC Volts Calibration and
ion (i.e., d. d. AC Current AC Current Calibration and Test
e. e. Ohms Calibration Ohms Calibration and Test
4-86. DC Volts 4-86.
when 4-87. Refer 4-87.
Signals, Performance Test Signals, and Performance Signals, Performance Test Signals, and Performance
Test Limits. Test Limits.
e 3478A parenthesis in the parenthesis
the calibration and test signals are applied to the 3478A's the calibration and test signals are applied to the 3478A's
HI and LO INPUT Terminals. HI and LO INPUT Terminals.
ion is 4-88. 4-88.
required test equipment for the DC Volts Calibration and required test equipment for the DC Volts Calibration and
Test. Test.
Digital Voltmeter (-hp- Model 3456A) Digital Voltmeter (-hp- Model 3456A)
tempted
For
3478A
:t:7%).
the
this
been
4-13 4-13
Calibration in progress.
Calibration Procedures Procedures
Each step in the procedures the procedures and the procedu
procedure procedure has has two two
The Performance Test part
esired. Since, after calibra Since, after calibration, the 34
not included. This is because This is because the 3478A
Calibration and Test-
Calibration and Test -
Calibration and Test -
Calibration and Test - - paragraph 4-99.
and Test - - paragraph 4-103.
DC Volts Calibration and Calibration and Teat
Refer to to Table 4-8 Table 4-8 for the DC Volts Calibration for the DC Volts Calibration
Each Each step step in t in the
in the procedure. procedure. Unless otherwise
Equipment Required. Equipment Required.
Table 4-8. Table 4-8. DC Volts Calibration DC Volts Calibration and Test
TM 11-6625-3071-14 TM 11-6625-3071-14
progress.
and the procedures
parts, parts, Calibration Calibration and and
Test part can be can be
tion, the 3478A 78A
the 3478A is is
Test- paragraph 4-86. paragraph 4-86.
Test - paragraph 4-90. paragraph 4-90.
Test - paragraph 4-94. paragraph 4-94.
paragraph 4-99.
paragraph 4-103.
Teat
he table table is show is shown in n in
Unless otherwise noted, noted,
The The following following is is the
and Test
res
the