Operator`s manual

13
Maximum current error due to Burden Voltage
B
E
S
E
B
E
x 100% in
−
=
B
E
S
E
M
I
B
E
x100 Ampsmilli in
−
−
=
Examples: Es = 14V, RL = 9Ω, IM = 1497.mA,
0.749V1.0 of 74.9%x1.0
2000.0
1497.0
x100
B
E ===
%06.5=
251.13
749.
x 100=
749.14
749.
x 100=% in error Maximum
Increase displayed current by 5.65% to obtain true current.
84.6mA
13.251
1121.2
.74914
.749x1497
Ampsmilli in
error Maximum
==
−
=
Increase displayed current by 84.6mA to obtain true current.
RESISTANCE MEASUREMENTS
The controls and terminals used to make resistance measurements are located on the front panel. The
measurement function is selected by pushing the kΩ switch to the IN position. The colored area enclosing
the kΩ function switch extends up and to the right enclosing the six range values for the resistance
function. To select a particular resistance range, push the range switch immediately above the value to be
measured. Connect the test leads; red to the V-Ω terminal and black to the COMMON terminal.
Use the following procedure to familiarize yourself with the resistance function and to see how the range
switches affect decimal point position on the LED.
1. With the test leads held apart, select the 2000 kΩ range. The LED should display an over range
indication (all digits are flashing).
2. Make a firm connection between the probe tips of the test leads. The LED should count down to
000.0.
3 Maintain a firm contact between the probe tips and sequentially select all ranges starting with the
200Ω range. The decimal point for each should be as follows:
Range Display
200Ω
2 kΩ
20 kΩ
200 kΩ
2000 kΩ
20 MΩ
199.99*
1.9999*
19.999
199.99
1999.9
19.999
*Display value will show lead resistance.
Automatic test lead compensation
When measuring low resistances, test lead resistance interferes with low resistance readings and usually
has to be subtracted from resistance measurements for accuracy.
DIODE MEASUREMENT
The five resistance ranges bar with a diode symbol beside the range value have a high enough
measurement voltage to turn on a silicon junction. These ranges can be used to check silicon diodes and
transistors. The 2kΩ range is preferred. It is marked with the largest diode symbol.