6
Digital Ground Resistance Tester Model 4500
CHAPTER 2
PRODUCT FEATURES
2.1 Description
The Digital Ground Resistance Tester Model 4500 is a rugged, easy-to-
use tester which is specifically designed for measuring very low resistance
on large grounding systems (ground grids, ground mats), even under diffi
-
cult conditions such as high stray currents or excessive auxiliary electrode
resistance.
This high performance instrument is capable of measuring up to 20k
Ω
,
and direct reading with a resolution of 1 milliohm is possible. The extra
large 3½ digit LCD display minimizes the possibility of operator reading
error, and dual indicators (blinking display and arrow) warn the operator
when excess stray current or auxiliary electrode resistance is present, or
when there is a lack of continuity between leads and electrodes. A beeper
notifies the user if a voltage greater than 20V peak is present between the
terminals X and Y or X and Z when the ground leads are connected.
The Model 4500 can be used to perform soil resistivity measurements with
the four-point method by using the high 20k
Ω
range and is designed in a
sturdy, dust and water-resistant carrying case with a detachable cover.
Carrying
Handle
Snaps for Closing Cover
Protective Cover
Case for
Papers
Compartment
for Leads and
Hex Key
X
X
Z
Y
v
BA
TTE
RY
CH
AR
GE
BLI
NK
ING
DIS
PLA
Y
AN
D
PO
INT
ER
IND
ICA
TE
EX
CE
SS
IVE
- TR
AN
SIE
NT
NO
ISE
- ELE
CT
RO
DE
RE
SIS
TAN
CE
EX
TERN
AL
12
V
TEST
RA
NG
E
TES
T C
UR
RE
NT
DIG
ITAL
GR
OU
ND
RE
SIS
TAN
CE
TES
TER
MO
DE
L 4
500
mA
2
10
50
Ω
k
Ω
2
20
200
2
20
50/
60/4
00
Hz_
110
V
!
BE
EP
ER
IND
ICA
TES
HIG
H
GR
OU
ND
VOL
TAG
E
AEM
C
I N S
T R
U M
E N
T S
Figure 1
