6
continuous beep when the input drops below 150
Ω
(Beep condition can be changed, refer to
“Changing the Power-UP Configuration” later in Section 3), and the readings for the test circuit are
displayed.
The diode test measures the forward voltage of a semiconductor junction at approximately 0.8mA. Readings
are displayed in the 3V range at the fast measurement rates. “OL” is displayed for voltages above 2.0V. Under
normal measurement condition, the positive pole of diode is connected with the black test lead.
To perform a diode or transistor junction test, press to select the
diode function. Then connect the test leads across the diode as shown
in Figure 2-7.
Notice how the test leads are placed. Reversing the polarity will
reverse-bias the diode.
dBm (Decibels) measure
The decibels modifier takes an ac voltage measurement, converts it to dBm (measure of decibels
relative to one milliwatt), and displays the result on the primary display. Connect the test leads as
shown in Figure 2-4.
Press dBm to toggle in and out of the decibels mode. When the decibels mode is selected, “dBm” is
shown on the primary display,
AC voltage value is shown on the secondary display.
Decibels can be selected only when ac voltage function is selected. Decibels are always displayed in
a single, fixed range with 0.01 dB resolution.
Press the AUTO toggle in and out autorange, you can
also press the . and change range manually.
A voltage measurement is converted to dBm using the following formula:
dBm = 10*lg (1000*value
2
/reference impedance)
where “value” is the measurement value, and displayed on the secondary display. The reference impedance
can be changed. (Refer to “Changing the Power-UP Configuration” later in Section 3).
Communication Interface
The real time measured value can be transmitted to the computer by the devote USB cable and the
VICTORVIEW_8145B software (refer to “using the communication function”in section 3).
SECTION 3
Operating the Meter from the Front Panel
INTRODUCTION
Section 3 explains how to operate the meter from the front panel.
FRONT PANEL OPERATIONS
The following operations can be performed from the front panel:
z
Select a measurement function ( DCV, ACV, DCA, ACA,
Ω
, FREQ, dBm
and )
z
Select function modifiers that cause the meter to display relative readings (REL),
minimum ,maximum or average values (MN MX)
z
Enter the Touch Hold mode (HOLD) to hold a reading on the display
z
Set Measurement Rate (RATE), change the rate as “F”(Fast) or “S”(Slow)
z
Take a measurement and compare (COMP) it to a setting value
z
Select the manual or autorange mode (AUTO), up range or down range manually
MAX
750V
1000V
10A FUSED
250V
ALL INPUTS
1KV MAX
FAST FUSE
500mA
mA
Figure 2-7. Diode Testing
