31
The LC103 must subtract residual effects of the test
leads when testing ESR, and small capacitor or inductor
values. The Lead Zero (LDO) and Lead Short (LDS)
listener codes duplicate the operation of the front panel
LEAD ZERO button to null out the effects of the
residual resistance, capacitance, and inductance of the
test leads and test fixture. The leads must be shorted
before sending the LDS command and opened before
sending the LDO command. If not, the test lead
impedance will not be compensated for.
Note: The leads can be nulled manually before turning
control of the LC103 over to the automated system.
Simply follow the procedures for manually nulling the
effects of the leads, as explained on page x. The LC103
will remember the correct compensation until the power
is turned off.
The No Function Command (NFC) cancels any test that
is in progress and places the LC103 into the standby
mode (no button pressed). ou only need to send “NFC”
if you want to clear a test. For example, you may wish to
turn off the capacitor value test function while you
remove one component and replace it with a different
one. It is not necessary to send “NFC” when changing
functions with a Test Function Command or when
changing component parameters with a Value Multiplier
command, since any listener code clears the current
function. Sending the “NFC” command when the LC103
is not in a test function has no effect.
———————— IMPORTANT ————————
Do not disconnect or connect any components to the
LC103 after performing any capacitor or inductor test
without first sending a No Function Command (NFC) or
other command to clear the test function. The LC103 may
be damaged if a charged capacitor, or static voltage is
connected to it. Also, a severe shock hazard may exist to
the user if a capacitor is removed after a leakage test
without first being discharged.
————————
ATTENTION
————————
Ne pas déconnecter ou connecter un composant au LC103
aprè avoir fait un test sur une capacité ou une inductance
avant d’avoir d’abord utiliser la commande de –pas de
commande- (NVC) ou une autre commande afin de vider
la function de test. Le LC103 peut être endommagé si une
capacité chargée ou une tension statique lui est connectée.
De plus, l’utilisanteur peut recevoir une décharge
électrique importante si la capacité est retiree sans avoir
été dé chargé après un test de fuite.
The front panel switches are automatically disabled
whenever the LC103 receives its first command. The
panel will remain locked out for all functions until the
Control Panel On (CPO) code is sent or until power to
the LC103 is removed.
NOTE: One exception is the capacitor leakage
function. Pressing any of the front-panel buttons will
manually unlatch the RS-232 use of the leakage power
supply.
RECEIVING DATA FROM THE LC103
The LC103 will send data to the computer whenever the
computer sends the correct “Talk” command. The data
returned over the bus will be the same as the reading
appearing in the display.
Sending a “Ctrl R” command tells the LC103 to send a
reading over the bus every time it updates the reading on
the display. The software in the computer determines
how many readings are recorded. Some applications
only need a single reading, while other applications may
require collecting several readings in a row.
Sending a “Ctrl O” command puts the LC103 in a single
reading mode. The LC103 will remain in the test
function, but the readings will not be sent to the
computer until a carriage return or another “Ctrl O” is
sent.
A second method to stop the LC103 from sending
readings is to send any listener code, including the No
Function Code (NFC), to the LC103. This will both stop
the readings and place the LC103 into its standby mode.
Always use this method if a different component is
going to be connected to the LC103.
Data Format
All data returned from the LC103 falls into a standard
data format. Each data string is 17 characters long and
contains information in four data fields. The software
can keep the entire string of characters together, or it can
separate the data into three parts for calculations or
processing.
Fig. 19: The data format returned by the LC103 is a
string of 17 characters long.
C A P X X X • X X X E X X X G CR LF
Header
Numeric Data Field
End
Terminator
GOOD/BAD
Indicator
