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Insulation Multimeters
Performance Test
21
I Nominal Test
The following test verifies the ability of the UUT to maintain the nominal insulation
test current while loaded.
1.
Connect the Test DMM and Calibrator to the UUT
INSULATION
terminals as
shown in Figure 8.
2.
Set the Calibrator to the Insulation Resistance Test Mode.
3.
Set the output resistance on the Calibrator 1 M
Ω
.
4.
Set the Test DMM to measure
μ
A DC
5.
Set the UUT to INSULATION, 1000V range.
6.
Press
t
on the UUT. The Test DMM reading should be greater than
1000.0
μ
A.
sHi
sLo
Hi
Lo
I
+
I-
!
1
2
3
4
5
6
7
8
9
0
Ñ
E
OFF
ON
Mode
Aux
Hz
Ω
A
V
A
B
C
D
E
F
CLR
G
H
I
J
K L
M N
O
P
Q
R
S
T
U
V
W X
Y
Z
OUTPUT
1500Vpk
max
15Vpk
max
15Vpk
max
HIGH VOLTAGE
DANGER
_
/
!
Calibrator
MIN M
AX
HOLD
REL
% ms
Hz
RAN
GE
dB
dB
ac+d
c
ac+d
c
ac+d
c
ac+
dc
F
nS
mA
mA
A
mV
V
mV
V
OFF
C
A
A
A
A
mA
COM
V
TEM
PER
ATU
RE
A
ac+
dc
AutoH
OLD
LOGG
ING
SAVE
CANC
EL
YES
NO
CLEA
R M
EM
VIEW
SETU
P
μ
A
189
>1000
μ
A
UUT
Test DMM
LOGGING
MULTIM
ETE
R
TEST
MIN MAX
HOLD
LO
1000V
ebp07f.eps
Figure 8. I Nominal Test
Low-Battery Test - DMM Function
The following test verifies the accuracy of the low-battery indicator (
b
) on the
UUT during DMM operations.
1.
Remove the batteries from the battery compartment on the UUT.
2.
Connect a 6-volt adjustable Power Supply between the positive and negative
battery terminals of the UUT as shown in Figure 9.
3.
Turn the rotary switch to
C
.
4.
Slowly reduce the Power Supply output while observing the display on the UUT.
Verify that the low-batter indicator (
b
) appears when the voltage is at 4.0 V
5.
Now slowly increase the Power Supply output while observing the display on the
UUT. Verify that the low-battery indicator (
b
) on theUUT goes out at 4.4 V.
6.
Slowly reduce the Power Supply output while observing the display on the UUT.
Verify that the UUT displays
bAtt
at 3.5 V.
7.
Turn the rotary switch to
OFF
to reset the display.