Maintenance; Test Leads - UNI-T UT256A Operating Manual

UT256A User Manual
The AC crest factor of a non-sinusoidal wave decreases
linearly to about 1.8 at 6000 counts. The additional error
should be added for the corresponding crest factor as
follows:
a) Add 3% when crest factor is 1~2
b) Add 5% when crest factor is 2~2.5
3）Continuity
Range
Resolution
Resistance <10Ω: Buzzer beeps
600.0Ω 0.1Ω
Resistance >100Ω: no beep
4) Resistance
Range
Resolution
600.0Ω 0.1Ω
6.000kΩ 0.001kΩ
60.00kΩ 0.01kΩ
600.0kΩ 0.1kΩ
6.000MΩ 0.001MΩ
60.00MΩ 0.01MΩ
Caution:
Measurement result = displayed value – resistance of
shorted test leads
Open circuit voltage: About 1V
Overload protection: 1000Vrms
21
Remark
Accuracy
± (1.2%+2)
± (1.0%+2)
± (1.2%+2)
± (2.0%+5)
UT256A User Manual
5) Audio/Visual alarm indicator
Function Status
< 12V (AC): Off
EFLo mode: Blinks in green
NCV
EFHI mode: Blinks in
yellow until it turns red
On, green
Continuity
Off
<1000V: Off
AC/DC
voltage
≥1000V: On, red
<200A: Off
Current
≥200A: On, red
X. Maintenance
Warning:
To avoid electric shock, make sure the test leads are
disconnected from the measured circuit before removing
the rear cover.
1. General Maintenance
1) Clean the meter casing with a soft cloth and mild detergent.
Do not use abrasives or solvents!
2) If there is any malfunction, stop using the meter and send
it for maintenance.
22
Description
No ACV signal
Weak ACV signal
Strong ACV signal
Continuity
Open circuit
Over range
Over range