Conrad VC940, Руководство по эксплуатации

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Model VC940: OPERATING MANUAL
13
Black Red
Figure 3-7. Frequency / Duty Cycle Measurement
Warning
To avoid harms to you, please do not attempt to input voltage higher than 30V rms.
To measure frequency and duty cycle, connect the Meter as Figure 3-7 and do the following:
1. Insert the red test lead into the Hz terminal and
the black test lead into the COM terminal.
2. Set the rotary switch to and press BLUE button to select the Hz measurement mode for frequency measurement or % for duty cycle measurement.
The BLUE button cycles among , frequency and duty cycle.
3. Connect the test leads across with the object
being measured.
The measured value shows on the primary display.
Note
z The requirement of Input amplitude “a” is as follows:
When 10Hz~40MHz: 200 mV ≤ a ≤ 30Vrms;
>
40MHz: Un-specified
z When Hz measurement has been completed, disconnect the connection between the testing leads and the circuit under test and remove the test leads away from the
input terminals.
H.
Measuring Temperature
Figure 3-8. Temperature Measurement
Warning
To avoid harms to you, please do not attempt to input voltages higher than 60V DC or 30V rms AC.
To measure temperature, set up the Meter as shown in Figure 3-8 and proceed the following.
1.
Set the rotary switch to , the primary display shows the room temperature.
The Meter is default to Celsius
°C
degree unit, you can change units by press the BLUE button once you have selected the temperature function.
2. Insert the point contact temperature probe into the Meter as figure 10.
3. Place the temperature probe to the object being
measured.
The measured value shows on the display after several seconds.
Note
z Place the Meter in an environment of 18
°C
~23
°C
otherwise false reading may be obtained especially in testing low temperature.
z The included point contact temperature probe can only be used with temperature 230
°C
below.
z When temperature measurement has been completed, remove the temperature probe away from the multi-purpose socket, and remove the multi-purpose socket away
from the Meter.
I.
4~20 mA loop current as % readout
It shows the mA measured value or output level in %, in a 4-20mA scale.
To use
4~20mA Loop feature, connect the Meter as follows:
1. Set the rotary switch to , and press BLUE button to select (4 20mA)% feature.
2. The rest procedure, please follow B. Measuring Current: DC current measurement (Figure 3-2).
3. When the readings obtained is:
z < 4mA, the primary display shows LO
z 4mA, the primary display shows 0%. ….
20mA, the primary display shows 100%
z > 20mA, the primary display shows HI
J.
Power Measurement