ACT6000 User Guide
– January 2021 Page 32 of 52
11. Digital Multimeter
(by DMM optional module ACT-12 adoption)
This item allows the selection of some metallic measurements:
AC/DC Voltage
, to measure extraneous voltage on the line,
AC/DC Capacitance
to
measure the
AC
capacitance and
Q
of the line or
DC
(by capacitor discharge method) the
capacitance value of the line plus the possible capacitance loads (i.e. telephones),
Resistance
to measure the loop resistance,
R-Bal
to measure the wires balancement,
Insulation
to measure the insulation resistance between the conductors and GND, the
RFL
to localize the possible low insulation points of the line and
Line / Load Impedance
.
The occasional calibration of the DMM is allowed by pushing the
F1
“
DMM Cal
” key.
11.1.
DC/AC Voltage Measurement
From the
Main Menu
select and enter the
Digital Multimeter
function, then select item
1.
Line Voltage
; on the display will appear the
menu shown to left.
- Push
“
Set Zero
” before connecting the
test cables .
- Push the
F2
key to select the
measurement mode
V DC
or
V AC
.
- Connect the line to
a
–
b
points and GND
reference to the
c
point of the
RTX
conn.
- Push the
F5
“
Start
” key and wait for the
sequence of results to be displayed.
●
Vab
value still in real-time
11.2.
DC/AC Capacitance Measurement
From the
Main Menu
select and enter the
Digital Multimeter
function, select item
2.
Capacitance Meter
; then select by
F2
or
F3
key the test modality AC or DC.
- Connect the line to
a
–
b
points and GND
reference to the
c
point of the
RTX
conn.
- Disconnect the AC/DC battery charger.
- Push the
F5
“
Start
” key to show the
results progressively.
When the DC
*
capacitance value between
a
-
b
is congruent with the typical capacitance of
copper lines, an estimation of the length
related to the capacitance value per meter is
automatically shown (see the
Cable Setup
menu at page 48).
To modify the Cap value nF/km and/or wires diameter use the commands group
By pushing the
“Photo” key, the measurement can be temporarily frozen and the
F5
key will allow to save the measurement in the internal memory.
* if found an extraneous voltage over 2.0 Volt, the test will be blocked !