3
GETTING STARTED
3.1
Battery Charger
The DO7PLUS is powered by two internal NiMH batteries. A 6V battery supplies power to the
display and operating circuits, and a 3V battery supplies the measuring current. Once the
power supply is connected to the socket (7) charging is automatic and regulated to ensure the
batteries are kept in the best possible condition. Charge status LEDS (8) show the charging
status for each battery independently. The green READY LEDS will light when batteries are
sufficiently charged for a measurement. The TOP OFF LEDS indicate a low maintenance
current and the FAST LEDS indicate the batteries are being charged with maximum current. If
a fault condition occurs then the FAULT LEDS will illuminate. Should this occur the instrument
should be taken out service and returned to a Cropico service centre for investigation and
rectification. The power supply should not be opened, dismantled or mechanically interfered
with.
In addition to the mains power supply provided with the DO7PLUS, a charging lead with car
style plug is available as an option enabling the DO7PLUS to be charged with 12 or 24 Volts
DC whilst away from base.
Note: To ensure correct charging operation, the DO7Plus must be switched off during battery
charging.
3.2
About the DO7PLUS Display screen
The display is a graphic LCD panel with backlight giving good readability and contrast. Full
measurement information is displayed with the measured value in large bold text. The
measurement set up parameters are shown in a clear and unambiguous way.
Figure 3.2.1 - Example of Resistance Measurement Mode
RANGE: 6k
100μA ( +VE )
+5.0589 k
FUNCTION
STATUS
TRIGGER
LIMITS
FILTER
SETTLING
DATA LOG
SING
OFF
OFF
OFF
OFF
BATT (3V)
BATT (6V)
98%
92%
STOP
RANGE
CURR MENU SET UP
A
C
D
B
Operating Instructions
Digital Microhmmeter Type DO7 PLUS
12
