Amptec Research 620A 4R, Operation And Maintenance Manual

For safety reasons

, the battery charger will only 

recharge the units NICAD batteries when the  
charger is plugged into the charging jack

 and 

the 620A-4R main power switch is in the “off” 
position.

In this way the 620A-4R user can not 

ever make a measurement while the unit is 
charging. 

  The 620A 4R is power “On/Off” 

switch design makes it  impossible to be 
powered (in operating - measurement mode) 
directly from the AC line adapter. As an 
additional note, the 620A 4R main power switch 

must also be

 in the “

Off/Charging

” 

mode

 in 

order for the connected battery charger to 
recharge the 620A 4R’s batteries.    

A fully charged battery pack typically powers 
the 620A 4R for approximately 8  hours before 
requiring a recharge. AMPTEC installs a quality 
set of 4 each Heavy Duty (5700 mAHr) Ni-Cad 
batteries. The 620A 4R will also operate on a 
4000 mAhr D cell Ni-Cads with a shortened 
operating time between charges. Recharge time 
is typically twice the “Power On” time. An 
“Overnight” charge usually restores the 620A 
4R to a “Fully Charged” ready to use state.

The “Power” switch has two separate modes. 
The “ON” position supplies internal battery 
isolated power to operate the 620A 4R when 
they are charged. If you turn on the 620A 4R, 
and the display does not come on, it may 
indicate the batteries need charging. The “OFF/ 
CHARGING” power switch position is for use 
when the batteries need charging or the 620A 
4R is not in use.   As mentioned earlier of 
course the AC/DC Battery Charger must be 
plugged into the 620A 4R’s notched  connector 
to facilitate charging the batteries.  

As mentioned earlier of course the AC/DC 
Battery Charger must be plugged into the 620A 
4R’s notched connector to facilitate charging the 
batteries. 

Although the batteries are fully charged prior to 
shipment, it may be desirable to refresh the 
charge for 24 hours before use.  As a rule of 
thumb, the 620A 4R requires twice as much 
time to fully recharge as the amount of 
discharge time.  For example, if the instrument 
was used continuously for 2 hours, the AC 
adapter must be connected for 4 hours in order 
to fully restore the charge. If you need a 
replacement AC/DC Battery Charger for the 
630, contact the AMPTEC customer service 
department and request an option “630DC” 
Battery Charger.

When the 620A 4R is first turned on, the unit 
draws more internal power to heat up the unit’s 
ovenized zener voltage reference. If the “Low 
Battery” Indicator only comes on for a few (i.e 
10 to 15 seconds) seconds when the 620A 4R is 
first turned on then goes out, the battery levels 
are starting to indicate the charge level is low. 

A-5.

Setup and Use 

The AMPTEC 620A 4R Igniter Tester may be 
setup to operate without the unit’s lid intact. By 
removing the hinge pins the lid may be removed 
(i.e. for indoor lab bench use). Typically a test 
procedure will have the 620A 4R user test the 
620A 4R  with the units  “Functional Test 
Section” to determine it is functioning properly 
and ready for use.

Once the AMPTEC 620A 4R has had it’s 
batteries charged for 12 to 24 hours it is ready 
for use. The 620A 4R consumes little power and 
generates virtually no heat.  Consequently, it 
may be used in any area where the environment 
does not exceed the specifications of Table B-2.

Avoid exposing the 620A 4R to extremes of 
temperature which will affect accuracy and 
shorten battery life-span.