15
Changing over between voltage, frequency and duty cycle
measurement
Repeated brief pressing of the yellow multi-function switch (5) changes the
measuring functions in the following order:
Voltage
g
From frequency or duty cycle measurement, directly switching back to voltage
measurement is possible.
l
by pressing the yellow multi-function pushbutton (5) for a long time. The
meter acknowledges this by two sound signals. The voltage measuring
range last selected is maintained.
l
by operating the function selector switch (6).
frequency
g
duty cycle
g
voltage ....
14. Duty cycle measurement
With duty cycle measurement, we can determine the ratio of pulse duration to
cycle time of recurring square-wave signals.
selector switch (6) to V
l
Connections are made in the same way as for voltage measurement
(See foot n
l
Briefly press the yellow multi-function pushbutton (5) twice.
The meter switches to duty cycle measurement. The duty cycle-that
is the percentage pulse duration of a signal-is displayed on the LCD in%
l
Set the function
- - - or V~ .
ote 8) on page 23.
13. Frequency measurement
Frequency measurement is possible on all voltage measuring ranges in AC
and DC modes.
l
Set the function selector s
l
Connections are made the same way as for voltage measurement, See
foot note (8) on page 21.
l
Briefly press the yellow multi-function pushbutton (5)
l
The multimeter switches to frequency measurement. The frequency is
displayed on the LCD.
l
See section "17. Specifications" for the lowest measurable frequencies
and the maximum permissible voltages.
witch (6) to V ~ or, V - - - .
Notes :
The applied frequency must remain constant during the duty cycle
measurement. Change -over between voltage, frequency and duty cycle
factor measurement is done as described in the preceding section.
l
That is:
Pulse duration
Duty cycle (%) =
————————
x 100
Cycle duration
16
We can exit the temperature measurement function
l
by pressing the yellow multi-function switch (5) longer, this is confirmed
by the two sound signals.
l
by changing the function selector switch.
15. Temperature measurement
The meter
Pt100 and Pt1000
temperature sensors in the range from -
E
Set the function selector switch (6) to “
E
Connect the sensor to the two unblocked terminals.
E
Briefly press the yellow multifunction pushbutton (5). The multimeter
switches to temperature measurement, it automatically detects the
connected sensor (Pt100 to Pt1000) and shows the measured temper
allows you to measure temperature with
0
0
200 (- 100) C...+850 C
Ω
”
ature
0
in C on the digital display.
Sensor lead resistance up to 50
Ω
Lead resistance of sensors upto 50 ohms can be compensated as follows:
E
Briefly press the yellow multi-function pushbutton (5) again.
The LCD now displays the resistance value which the multimeter
automatically considers after selecting the temperature measuring
range. We can recognise that this is the resistance correction value on
the temperature measuring range. The “
simultaneously shown on the display.
E
You can set the lead resistance correction value as follows:
E
Press the DATA- MIN/MAX pushbutton (3) to increment the value, or the
AUTO/MAN pushbutton (4) to decrement the value. Each time the
pushbutton is briefly pressed, the value changes by one digit.
E
Briefly press the yellow multi-function pushbutton (5) again.
The LCD displays the measured temperature. The flashing decimal
point shows you that we have entered a correction value for the lead
resistance. The correction value is retained as long as multimeter is
switched on.
E
Each time the yellow multi-function pushbutton (5) is briefly pressed,
the display changes between measured temperature and correction
value of the lead resistance.
0
C’’ character is
Notes:
It is not possible to switch over to temperature measurement when the 30
Ω
resistance range is selected.
Notes:
For the lead resistance, the actual value measured on the digital
multimeter should be taken as correction value and not any specified value.
Summary of Contents for Zeta 30
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