DranTech PMIT User’s Guide
11
7.2
Frequency Measurement [Hz]
➭
Select the V~/Hz measuring function with the rotary selector
switch.
➭
Apply the measured quantity as described under voltage
measurement.
➭
Briefly press the FUNC key in order to measure frequency.
The frequency values appears at the main display. The
frequency measuring range can be selected subsequently by
pressing MAN|AUTO. The previously selected voltage
measuring range remains active.
➭
The instrument can be switched from frequency
measurement back to alternating voltage measurement by
pressing the FUNC key once again. This selection is
acknowledged with an acoustic signal.
Note!
Frequency measurement is only possible if the measuring
signal passes through zero (AC coupling).
8
Resistance and Diode Measurements
8.1
Resistance Measurement (2-wire connection) [
Ω
]
➭
Make sure that the device under test is voltage-free (see
chapter 7.1). Interference voltages distort measurement
results and damage the instrument!
➭
Set the rotary selector switch to “
Ω
”.
➭
Connect the device under test as shown.
Note!
High Impedance Measurements in the 3 M
Ω
/30 M
Ω
Range
In the event of extremely high resistances the capacitive
influence of the person performing the measurement and/
or the measuring cable may distort the measured value.
Use therefore short or shielded measurement cables.
8.1.1 Zero Balancing in the 300
Ω
and 3 k
Ω
Measuring Ranges
Cable and contact resistances can be eliminated for the
measurement of small resistance values in the 300
Ω
and 3 k
Ω
ranges by means of zero balancing:
➭
Plug the measuring cables into the instrument and connect
the free ends to each other.
➭
Press the FUNC key.
The instrument acknowledges zero balancing with an acoustic
signal, and “000.00
Ω
” or “0.0000 k
Ω
” and the “ZERO” symbol
appear at the display. The resistance value measured at the
moment the key is pressed serves as a reference value (max. 20
Ω
,
or 200
Ω
, or 2000 digits). It is automatically subtracted from all
subsequent measured values. If the measuring range is changed
(MAN |AUTO key), the ZERO function remains active (at the
display and in memory).
➭
Zero balancing can be deleted:
–
By once again pressing and holding the FUNC key, which is
acknowledged with two acoustic signals,
–
By switching the instrument off.
0.L
k
Ω
FUNC
0.5435
di odE
V
FUNC
000.0
Short
Ω
FUNC
Ω
m
Ω
S+
S–
V
Ω°
C
R
x
Voltage Drop
Ω
: 10 m
Ω
…
30 M
Ω
Overall measuring range:
+
–
