Operating The Meter From The Front Panel; Front Panel Operations - Victor 8145B User Manual

continuous beep when the input drops below 150Ω (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
10A FUSED
1000V
MAX
750V
mA
500mA 250V
FAST FUSE
ALL INPUTS
1KV MAX
Figure 2-7. Diode Testing
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,
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.
also press the .
A voltage measurement is converted to dBm using the following formula:
dBm = 10*lg (1000*value
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).
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:
Select a measurement function ( DCV, ACV, DCA, ACA, Ω, FREQ, dBm
and
Select function modifiers that cause the meter to display relative readings (REL),
minimum ,maximum or average values (MN MX)
Enter the Touch Hold mode (HOLD) to hold a reading on the display
Set Measurement Rate (RATE), change the rate as "F"(Fast) or "S"(Slow)
Take a measurement and compare (COMP) it to a setting value
Select the manual or autorange mode (AUTO), up range
To perform a diode or transistor junction test, press
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.
AC voltage value is shown on the secondary display.
and change range manually.
2
/reference impedance)

Operating the Meter from the Front Panel

)
connected with the black test lead.
Press the AUTO toggle in and out autorange, you can
or
6
to select the
SECTION 3
down range manually