Fluke 8845A, User Manual

Page: 52 / 103

8845A/8846A
Users Manual
3-10
Note
The 20 Hz filter is the power-up default selection.
Setting Continuity Resistance Threshold and Diode Test Parameters
The threshold resistance value for the continuity function and the amount of current and
voltage used for Diode testing are adjustable. Continuity resistance threshold can be set to
four different values: 1
Ω
, 10
Ω
, 100
Ω
and 1 k
Ω
. Diode test voltage and current can also
be set to two different values: 5 V or 10 V and 1 mA or 0.1 mA.
Setting the Continuity Threshold Resistance
The resistance threshold can be set at 1, 10, 100, or 1000
Ω
. To set the threshold:
1. Press
L
to see the Measurement Setup menu.
2. Press the
MORE
soft key.
3. Press the
CONTIN OHMS
soft key.
4. Press the soft key labeled with the desired threshold.
Refer to the “Testing Continuity” section in Chapter 4 to test continuity.
Setting the Diode Test Voltage and Current
To set the diode test current:
1.
Press
S
twice on the 8846A , or press
D
once on the 8845A, to select the Diode
function.
2. Press the
1€A
or
0.1€A
soft key to set the diode test current.
3. Press the
5V
or
10V
soft key to set the diode test voltage.
Refer to the “Checking Diodes” section in Chapter 4 to check diodes.
Setting the Default Temperature Scale (8846A Only)
When the temperature function is selected, the Meter displays temperature measurements
based on a preselected (default) temperature scale.
To change the default temperature scale:
1.
Press
L
to see the measurement setup selection menu.
2. Press the
TEMP UNITS
soft key to display the temperature scale selection menu.
Available temperature scales are C for Celsius (
°
C), F for Fahrenheit (
°
F) and K for
Kelvin (K).
3. Press the soft key labeled with the desired scale.
Refer to the “Measuring Temperature” section in Chapter 4 to make a temperature
measurement with the Meter.
Enabling High Input Impedance
The DCV input impedance of the Meter is normally set to 10 M
Ω
. Enabling the high
input impedance feature allows the input impedance to exceed 10 G
Ω
for the 10 V and
lower DCV ranges.
To enable high input impedance:
1.
Press
L
to see the Measurement Setup menu.