Model 3400A Controls And Indicators - HP 3400A Operating And Service Manual

m
Section
®
H(Wl(TT
•
RANGE
oe
VOLTS
1 .
Direct reading meter: dc meter which indicates
rms voltage level of input signal.
2.
Mechanical zero adjustment:
adju��ment for zero of direct reading meter.
3. LINE ON pilot lamp:
indicates when power is applied to instrument
and power sWitch is ON.
4. Power switch: two-position toggle switch which
applies 115- or 230-volts ac to instrumenl.
5. RANGE switch: 12-position rotary switch
which selects various attenuation ranges
available within Model 3400A.
6. INPUT connector: BNC jack which enables
application of input signal to instruments
measuring circuits.
3-0
LINE
oe
VOLTS
screwdriver
neon lamp which
Figure 3-1.

Model 3400A Controls and Indicators

115 / 230-volt switch: two-position slide switch
7.
which sets instrument to operate from either
a 115- or 230-volt ac source.
8. Input power jack: three-prong jack which
enables application of line voltage to instru­
ments power supply circuits.
9 . 115V / 230V. 25A FUSE:
which provides protection against line voltage
surges.
10. DC OUT jack: telephone-type jack which pro­
vides negative I-volt dc out at full scale de­
flection, output is proportional to meter de­
flection. Output impedance is 1000 ohms.
A telephone type plug for the DC OUT jack may
be purchased under -hp- Part No. 1251-0067.
Model 3400A
0. 25 ampere fuse