HP 740B Operating And Service Manual page 14

Model 740B
INDEX NO.
7
8
9
10
11
12
13
14
15
16
17
18
19
20
NAME
OVERLOAD Indicator
OUTPUT PUSH ON-OFF
Pushbutton-Indicator
OUTPUT Receptacle
CURRENT LIMIT
Control
STANDARD VERNIER
Rotary Switch
VOLTAGE SET Rotary
Switches
VOLTMETER SENSI-
TIVITY Pushbuttons
INPUT Receptacle
POWER ON -OF»" Push-
button -Indicator
Ground (
~
) Terminal
+
and - INPUT Terminals
Input GUARD Terminal
INPUT Z 2 -position
Switch
Output GUARD Terminal
Section III
FUNCTION
Indicates an input voltage in excess of the selected
range in the Differential Voltmeter and DC Volt-
meter modes of operation-; indicates the selected
current limit has been exceeded in the DC Stan-
dard mode of operation; may light momentarily
when RANGE, FUNCTION or VOLTAGE SET is
changed to indicate circuit instability.
Lights when depressed to indicate application of out-
put voltage to OUTPUT CABLE terminals in DC
Standard mode of operation; goes out when depressed
second time to indicate removal of output voltage.
Supplies output voltage in DC Standard mode of
operation when the OUTPUT CABLE, -hp- ac-
cessory 11055B, is connected; supplies output
voltage whenever the Model 740B is used as a
power amplifier.
Provides adjustment of maximum output current
supplied to the OUTPUT terminals.
Controls sixth digit of output voltage in the DC
Standard Mode of operation.
Provide first five significant digits of output voltage
in DC Standard or input voltage in Differential
Voltmeter mode of operation.
Select decade and meter sensitivity in Differential
mode of operation; select meter sensitivity in DC
Voltmeter mode of operation.
Accepts INPUT CABLE, -hp- accessory 11054A.
Used in Differential Voltmeter and DC Voltmeter
modes of operation.
Lights when depressed to indicate application of
line voltage to the instrument. Goes out when
depressed second time to indicate removal of
line voltage.
_,Accepts lead for connecting to power line ground.
- This terminal and the instrument case are con-
nected to power line ground through the center
conductor of the power cord.
Accept leads for application of dc input voltage.
Connected to the internal guard shield. For making
guarded measurements, the GUARD terminal is
connected to the reference potential of -the source.
For making unguarded measurements, strap on
GUARD terminal is connected to the - INPUT ter-
minal.
Varies instrument input impedance. The
00
position
is used for making most voltage measurements.
The 2 MEG position is used for discharging the
input circuit following high voltage measurements.
Connected to the internal guard shield. Accepts lead
for guard connections when providing guarded out-
puts in the DC Standard mode of operation. For
unguarded outputs, strap on GUARD terminal is
connected to the - OUTPUT terminal.
01794-1
Fig:ure 3 -3. Front and Rear Panel Controls, Indicators and Connectors (Cont'd)
3-3