Front And Rear Panel Features - HP 3456A Operating And Service Manual

Operation
Display - Indicates polarity and amplitude of the measure­
ment. Measurement results are indicated in either 3 y" 4 y"
5 y., or 6 Y. digits, dependent on the Number of Digits
displayed and the Number of Power Line Cycles Integrated.
The LEO at the bottom left hand corner of the display in·
dicates the front panel sample rate.
Function Selection Buttons
2·Wire Ohms, and 4·Wire Ohms. Included is the SHIFT but·
ton which is used to place the 3456A into the shifted func·
tion consisting of: DCVlDCV Ratio, ACV(OCV Ratio,
ACV OCV(OCV Ratio, 2·Wire O.C. Ohms, and 4-Wire
+
O.C. Ohms. The LEO to the function button's right will also
light when the button is pressed.
Autozero Button - enables or disables the Autozero feature.
The LED to the button's right is lit when the feature is
enabled. Refer to Paragraph 3·48 for more information.
Filter - enables or disables the Analog Filter. The LEO to the
button's right is lit when the Filter is enabled. Refer to
Paragraph 3·52 for more information.
Numbered Keyboard .
storing a number value into registers which are used in
some math operations and other operational changes
(Number of Digits displayed, etc.l. Refer to Paragraph 3·54
for more information.
Ratio Ref/4WRO Sense Terminals · are used for the Ratio
Reference Voltage or 4·Wire Ohms measurement.
Volts/2WRO/4WRO Terminals
ACV, OCV, ACV + OCV, and 2·Wire Ohms measurement.
I n addition, the terminals supply the current for a 4·Wire
Ohms measurement.
Front/Rear Switch · With the switch "out" the front ter·
minals are enabled and with the switch "in" the rear ter·
minals are enabled.
CD
Front Guard Switch · internally connects the GUARD ter·
minal to the VOLTS LOW terminal.
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Front Guard Terminal.
3-2
DCV, ACV, ACV + OCV,
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is used to select math operations,
input terminals lor the
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Figure 3·1. Front and Rear Panel Features.
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Clear Cont - is used to continue with the 3456A's last
operation after an attempt was made to stOl"e into a
register. It is also used to clear the display after a register
has been recalled.
Trigger Buttons · permits selection of Internal, External,
®
Single, or Hold Trigger modes. An LEO to each of the but·
ton's right is lit when the button is selected. Refer to
Paragraph 3·46 for more information.
®
Range Selection Buttons . are used to manually or
automatically uprange and downrange the 3456A. The
LED to the AUTO bulton's rioht is lit when AutorMoing is
selected.
®
Test Button · enables or disables the 3456A's Internal
Test. Refer to Paragraph 3· 1 7 for more information.
Reading Storage Button · allows the 3456A to internally
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store a number of readings. The LEO to the bulton's right is
fit as long as readings are stored. The LED turns off when
Reading Storage is disabled and when the 3456A's internal
memory is full. Refer to Paragraph 3· 1 0 1 for more informa·
tion.
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Hp·IB Control Buttons and Status Indicators defined as
follows:
SRC Button · enables the 3456A to send a "ReQuire Ser·
vice Message" when the button is pressed. Refer to Para·
graph 3 · 1 9 8 for more information.
Local Button · takes the 3456A out of Remote.
SRC Light · indicates a "ReQuire Service" condition when
lit. Refer to Paragraph 3·130 for more information.
.
listen Light is lit when the 3456A is addressed to
"listen" .
Talk light · is lit when the 3456A is addressed to "talk".
Remote Light · indicates that the 3456A is in Remote when
lit.
@ Line Switch · With the switch "out" the 3456A is turned
off and with the switch "in" the instrument is on.
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Reset Button · returns the 3456A to its turn·on condition
when pressed.
Model 3456A