TM 11-6625-3071-14
3478A
1 Use the measurement keys along the top row to select
the type of measurement you want to make.
2. The 12 character alphanumeric display includes 12
dedicated annunciators. The display is read directly in
engineering units, i.e., MV for millivolts, MOHM for Meg-
ohm resistance, etc.
3. If the blue key Is pressed before another key, the
function shown above that key is executed.
4. These terminals are used for the voltmeter sense
leads when making 4-wire ohms measurements.
5. These terminals are the voltmeter and 2-wire ohms
input, 4-wire ohms source current terminals.
6. This is the Amps input terminal and is used with the
INPUT LOW terminal. 13 Amp fuse protected)
7. When this switch is out, the front panel input
terminals are selected. If the switch is in, the rear panel
terminals are used.
8. These keys are used to select special operating
features of the 3478A The blue shift key allows for
selecting the “SHIFTED” functions of the bottom row of
keys.
The. lnternal Trigger is selected by this key. In this
mode, the 3478A triggers itself.
Auto
ze
ros is a function that allows you to enable or
disable the internal zero correction circuitry.
Pressing the Single Trigger key causes the 3478A to
take one reading and wait for the next trigger impulse.
This impulse can come from either the Single Trigger
key or the External Trigger input (rear panel BNC).
The Test/Reset key performs an internal self test, then
resets the 3478A to its turn-on state. Any errors in the
self test are noted in the display.
The front panel SRQ (Service Request) key is an HP-IB
operation that enables you to manually interrupt the
controller. This key is enabled by setting the SRQ mask.
Figure 3-1. 3478A Front and Rear Panel Features
3-2
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