All variants of the
BM220
series of instruments have the following features:
✷
1mA Insulation test current
✷
200mA Continuity test with lead zeroing facility
✷
Combined curved Analogue / Digital display
✷
Continuity Beeper
✷
Auto shut off
✷
Display Back light
✷
Low Battery indication
In addition, particular models have the following features:
OPERATION
Preliminary Test lead check
1.
Before each use of the instrument, visually inspect the test leads, prods
and crocodile clips to confirm that their condition is good, with no damaged
or broken insulation.
2.
Check continuity of the test leads by firmly shorting the leads together
and read the test lead resistance. measurement directly from the display.
Backlight operation
1.
Turn the instrument backlight ‘On’ by selecting the
position.
2.
When the backlight is activated, select the desired test position.
3.
On completion, select the ‘OFF’ position to de-activate the backlight and
conserve battery life.
Continuity Testing
1.
Turn the instrument ‘On’ by selecting the
Ω
range.
2.
If required, zero test lead resistance by firmly shorting both leads together,
wait for the reading to stabilise and press the test button. Display of the
symbol confirms lead zeroing. Note: Lead zeroing cancels each time
the instrument is switched off, or Auto shut off operates.
3.
Connect the test probes to the isolated circuit under test.
4.
The display shows the resistance value. (Maximum 99,9
Ω
)
5.
On completion switch to ‘OFF’ position. Alternatively auto shut off operates
after 5 minutes of instrument inactivity.
Continuity Beeper
On the
position, a continuous beep note
sounds when the test leads make contact with resistance less than 5
Ω. Ι
f
contact is maintained, beeping ceases after a few seconds and the resistance
value is displayed. Resistance greater than 5
Ω
is indicated by an intermittent
beep note.
BM221
BM220
BM223
BM224
BM227
* 250 Volt Insulation
√
√
* 500 Volt Insulation
√
√
√
√
√
* 1000 Volt Insulation
√
√
* Default Voltmeter
√
√
√
√
* Visual Voltage Warning
√
Leads
Nulled
Low Battery
Fuse
Ruptured
Refer to Safety Warnings before using the instrument
DISPLAY FEATURES
High
Voltage
1000V
100
200
100 M
300
10 M
400
1 M
V
100k
500
0
1 G
Default
Voltage
