User Manual LKG 610
16
Performance Check
The following tests will confirm that the LKG 610 is performing properly.
1.
Connect the LKG 610 to a 110 VAC outlet (220 VAC for the LKG 610-220).
The power on default function is “Line Volt”. The LCD display will present the
line voltage in Volts. If the outlet polarity is reversed the LCD will indicate ‘-
POL’.
2.
The Test Lead resistance is offset internally and adjusted at the factory. The
Test Lead resistance can be checked by connecting the Test Lead between
the receptacle ground and the case ground (CHASSIS). When the CHS GND
switch is momentarily pressed, the connection will be open and the display
will read zero.
A test lead other than the 503 may require adjustment with the zero adjustment
control.
3.
Connect the Test Lead to the REF GND jack. Press the switch “CHS RES”.
The display will read 1000 mil 5% (1 Ohm).
4.
Connect the Test Lead to the TEST POINTS marked 200
µ
A. Press the
“EARTH LKG” key. The display will read 200
µ
A + 2%.
Theory of Operation
The LKG 610 circuitry can be divided into main functional blocks as shown in Figure 3.
Each performs a key role in the operation of the instrument.
Figure 3
Functional block diagram of the LKG 610
D
SP
& Func
tion
Sel
ect
or
AAMI or
IEC 601
RMS TO
DC
CURRENT
SOURCE
LEDS
DI
SP
LAY
AMP
TEST
RECEPTACLE
E
C
G
