32
32
3.3 Audio continuity test (
)
1. Connect the measurement cables to the unit terminals.
2. Set the rotary switch to position "
".
3. Connect the unit to the circuit to be tested. The buzzer is
continuously active as soon as contact is established (circuit
closed) and if the resistance value measured is lower than
the threshold value chosen by the programming (adjustable
from 1 to 40
Ω
, see § 03.12.10).
Above 400
Ω
, the display indicates
OL.
■
■
■
■
■
Cable resistance compensation (
Ω
Ω
Ω
Ω
Ω
zero)
To measure low resistance values, measure the cable
resistance first.
- Short-circuit the cables.
- Press and hold the HOLD key until zero appears on the
display. The cable resistance value will then be memorised
and subtracted from the value of the resistance measured
later.
Note: If the value measured is higher than 2
Ω
, this
correction is stopped and the memorised correction
value is reset to zero.
■
■
■
■
■
Characteristics
Display range
400
Ω
Measuring range
0.0 to 399.9
Ω
Accuracy
(1):
1% R +2 pt
Resolution
0.1
Ω
Open circuit voltage
≤
3.2 V
Measuring current
320 µA
Protection
500 V AC or 750 V (DC or peak)
(1) with compensation for measurement cable resistance
■
■
■
■
■
MIN/ MAX Mode:
- Accuracy: same as previous table +0.2% R
- Capture time: 100 ms typ.
3.4 Resistance measurements (
Ω
Ω
Ω
Ω
Ω
)
1. Connect the measurement cables to the unit terminals.
2. Set the rotary switch to position "
" and press once
on the yellow key: The
symbol is no longer displayed.
3. Connect the unit to the circuit to be tested.
Range selection is automatic.
To measure low resistance with accuracy, compensate the
cable measurement resistance
(see § 3.3).
Above 40
Ω
, the display indicates
OL.
