HP 4328A Service Manual

Section III
Figure 3-1
..,._ ..... -
C@m HEWLETT PACitARD
1. LINE-ON/OFF.'FAST CHARGE: Instrument
power ON/OFF/FAST CHARGE toggle switch
connects either ac line or internaL battery
(option 001 only) to internaL voltage regulator
circuit and provides fast charge to the battery.
2 LINE lamp: This pilot lamp glows when the
instrument is turned ON. In optwn 001, the
pilot Lamp glows when power cord is connected
to ac 115
1
230V source when power switch is
in ON or FAST CHARGE positions. When the
pilot lamp glows ( Optwn 001 ) batteries are
charging continuously.
3. BATT. TEST: Push on~'off switch (non-lock) -
a
battery test Is made when the push button is
depressed irrespective of the position of the
ON
1
0FF·FAST CHARGE switch.
4. RANGE: Low resistance measurement range
selector; seLect ranges from lm!J fuLt scale to
1000 fuLl scale.
10
,.
•••
BATT .. TESr
3
~--~~------~2
LINE
OFF fAST
CHAitti:E
Model 4328A
5. PROBE: Cord, for measurement, divides into
2 probes at moduLar connector.
8_ CAUTION
Superimposed DC voltage limits are
as folLows:
(1)
Between High and Low terminals
±150Vdc maximum.
(2) Between Low terminal and GND
±500Vdc maximum.
Do not superimpose DC voltage above
sample limits.
6. MechanicaL Meter Zero: Sets meter suspension
so that meter indicates zero. To adjust the zero.
a. Remove power from the instrument.
b. Turn the adJustment screw cLockwise until
the indicator falls beLow zero and comes
back up to zero again.
,1,
I •
I
t·
c. Turn the adjustment very slightly counter- •
clockwise to free up the mechanism from
the adJUSti.ng peg.
Figure 3-1. Front Panel Controls and Connectors
3-2

HP 4328A Specifications

General

Brand	HP
Model	4328A
Category	Measuring Instruments
Language	English