Do
NOT
use Auto range when measuring inductive devices e.g. motors and transformers.
Fig 4.5.1 Measuring ranges with maximum current and resolution
Range
Measuring
Current
Resolution
6.0000m
10A
100n
Ω
60.000m
1 A
1μ
Ω
600.00m
100mA
10μ
Ω
6.0000
Ω
10mA
100μ
Ω
60.000
Ω
1mA
1m
Ω
600.00
Ω
100μA
10m
Ω
6.0000k
Ω
100μA
100m
Ω
4.6
Setting the Measurement Current Mode
F2 Current
The F2 function key will take you directly to the measurement current set-up menu
HINT:
To navigate around the screen use the navigation arrows
To select the highlighted mode PRESS OK (F5) or the carriage return key
Pressing the left arrow will return you to the measurement screen without
selecting the new highlighted range.
Pressing F1 (ESC) escapes the range menu and returns to the measurement
screen without updating the range.
+ I
The measurement current flows in the positive direction
-
I
The measurement current flows in the negative direction
AVERAGE
The measurement is made with +I current then a second measurement with
I current, and the average value of the two measurements is displayed. The
average measurement will eliminate the effects of thermal emf and is
recommended for all resistive measurements.
WARNING:
The AVERAGE mode should
NOT
be used when measuring inductive samples
such as transformers or motor windings. In these cases use the +I mode which will give
continuous and uninterrupted measurement current, ensuring the inductance is fully charged
and the correct reading displayed.
INSTRUMENT MENU
CURRENT:
+I
-I
ZERO
MODE
ESC
OK
AVERAGE
Operating Instructions
Digital Microhmmeter Type DO7 PLUS
19
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
