Display; Error Messages; Dc Voltage Measurement; Front Panel Voltmeter Configuration Area - HP 3456A Operating And Service Manual

Operation
and light all the front panel LEOs. This remains until
the test is completed. Once the test is completed, the
display and the LEOs go blank for a time and the test
operation starts again. If any of the internal checks do
not pass, a negative integer corresponding to the check
which did not pass is displayed. The displayed number is
also output over the HP-IB with the 3456A in remote. A
' lOO" is output when the test passes. To disable the test
operation press the TEST bullon a second time.
NOTE
Make sure no connection
3456A ' s Input T erminals and the GUARD
switch is in the "IN" position during the
Test mode.
NOTE
Refer the 3456A to a Service Trained Per­
son, i f the Internal Test does not pass.
3·19. Display.
3-20. Refer to Figure 3-3 to see how readings arc
displayed. Note that the 1 V through 1000 V ranges are
displayed as they are measured with the decimal point in
the correct place like this:
1 .0000 0
1 0.0000
100.000
1000.00
3 4 5 5 A D I G I T AL V O L T M E T E R
[W]
H( .... L E Tr. PAcKARD
• • • •
1 0
1 100
IK
o
o
Figur. 3·3. 3456A Display.
Additionally, a I , 10, 100, and 1 K are marked on the
front panel and are located below the decimal point of
the respective ranges with the other ranges indicated in
engineering notation. The position of the decimal point
on the display marks the decade multiplier. The range is
easily determined by multiplying the displayed exponent
)·4
is
made at the
I V Range
1 0 V Range
100 V Range
1000 V Range
MA rH
0 o
0 o
3 4 5 6 - 3 - 3
by the decade multiplier. For example:
1
decade multiplier .. ..
I
shows a reading of . 10979 V or 109.79 mV. The decade
multiplier is not used in the 3456A's Ratio and Math
functions.
3·21. Error Messages.
3-22. Error Messages
operating conditions. They are displayed like this:
"0"
where is the number indicating which error is
generated. The instrument keeps displaying the Error
Message until the condition producing the error is
changed a valid state. A listing of the various error
10
messages is given in Table 3-1.
Table 3-1. Error Messages.
Error No .
1
disabled
Autozero
Displayed in Remote only.
2
Analog Filter enabled in any Ohms
Displayed in Remote only.
3
Any invalid Range and Function combination
10 M
lExample:
Function). Displayed in Remote only.
Attempt was made to store invalid number into a
4
register IExample: a
ber of Digits Displayed register).
Attempt was made to store any number into
5
M,
register C,
Attempt was made to recall non·existent stored
6
readings from memory.
3·23. OPERATING CHARACTERISTICS.
3-24. Refer to Figure 3-4, the front panel's Voltmeter
Configuralion area, for the following paragraphs.
• • • •
I ­
• •
• •
Figure 3·4. Front Panel Voltmeter Configuration Area.

3-25. DC Voltage Measurement.

3-26. The -hp- Model 3456A is capable of measuring dc
Model 3456A
0 9 9 .)
7
10 100 1 K EXP
are displayed for invalid
E D
Delcription
,
; '"V Shifted Functions.
Functions.
ohm Range selected for the DCV
'·9"
is stored into the Num-
or V.
•