HP 3456A Operating And Service Manual page 116

Digital voltmeter
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Ratio Ref/4WRO Sense Terminals - are used for the Ratio
Reference Voltage or 4-Wire Ohms measurement.
Volts/2WRO/4WRO Terminals
+
ACV, DCV, ACV
DCV, and 2-Wire Ohms measurements.
In addition, the terminals supplV the current for
Ohms measurement_
@
Rear Guard Switch
internallv connects the GUARD ter­
minal to the VOLTS LOW terminal.
@
Rear Guard Terminal.
@
Voltmeter Complete Connector - Outputs pulse during mea­
surement cvcle.
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IRE ... R P ... �ElI
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Rev B
7-8
input terminals for the
Cl
4-Wire
Figure 7-6. Change # 1 0 in Figure 3·1
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Figure 7-7. Change # 1 0 on Schematic 1 4
®
HP-IS Connector used to connect to HP-IS.
®
HP-IS Address Selection Switch - Sets 3456A HP-IS Ad­
dress.
@
External Trigger Input Connector.
®
Cooling Fan.
®
Power Line Voltage Selection - Refer to Paragraph 2-8_
®
Fuse -90 V to 126 V -.75 amp, 1 98 V to 2 5 2 V -.375
amp.
®
AC Power Connector.
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3456A

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