METREL MI 3290, Instruction Manual

Page: 114 / 162

MI 3290 Earth Analyser Tests and Measurements
114
11.11 Checkbox
The Checkbox provides a simple and effective means of checking the Earth Analyser
instrument and accessories especially Flex and Iron Clamps.
Checkbox Measurement Test
Mode LF HF Filter Test
Voltage
Uh, Us, Ues,
f, Igen, Ic,
If1, If2, If3, If4 Check V – Meter single 55 Hz 15 kHz FFT 20/40 V
Check A – Meter single 55 Hz 15 kHz FFT 20/40 V
Check Iron, Flex Clamps single 55 Hz 1,5 kHz FFT 20/40 V
Table 11.97: Available Checkbox measurements in the MI 3290
Note:
 The Checkbox feature should be used to ensure that the meter is reading correctly
between calibrations but should not be regarded as a substitute for a full
manufacturer’s calibration on the unit.
U
s
U
h
H
S
ES
E
MI 3290 Earth Analyser
G
V
V
V
Output terminal
(H, S, ES, E) Open !
S1
S2
S3
DMM
+
-
V
optional
U
es
H
S
ES
E
M
I 3
2
9
0
E
a
rt
h
A
n
a
ly
se
r
G
A
DMM
+
-
A
Ig
e
n
optional
Figure 11.98: Checkbox measurements
V-meter example
Figure 11.99: Checkbox measurements
A-meter example
F4 F2
F3 F1
Flex clamp
If1
H
E
MI 3290 Earth Analyser
G
A
Igen
A
C
C
Ic
Igen
If2
Iron clamp
Figure 11.100: Checkbox measurements Iron, Flex Clamps example