Operation Of The Hm8018; Frequency; Test Voltage - Hameg HM8018 Benutzerhandbuch

indicate the new range. A long press on this key
switches the instrument to autorange mode.
Then the AUTO LED is lighted up. If this key is
pressed during the instrument is in the auto-
range mode it will cause a hold of the current
range which will be fleeting displayed.
MODe (pushbutton)
This key allows selection of the serial or pa-
rallel mode for parameters calculation.
–/+ Connection terminals
( 4 mm banana socket)
Terminals to connect the components to test.
BIAS (pushbutton) and ON (LeD)
Press this key to apply a 1 V
the terminals
activated the ON LED lights up. This function
is recommended for polarized capacitors
measurements in order to avoid polarity in-
versionbecause of the alternating measuring
voltage. If the BIAS button is pushed again
the BIAS function will be deactivated (the LED
turns off).
FUNCtION (pushbutton)
This key allows the selection of the main
function of the instrument. If series mode is
selected this key gives access to the following
parameters C
instrument displays the value of C
Kelvin input (5 pole diode socket)
Terminal for connection of the 4 wire Kelvin
Test Leads HZ18
FUNCtION (pushbutton)
This key allows the selection of the secondary
functions of the instrument. It gives access
to: phase angle measurement (
+180°), impedance module, quality factor or
dissipation factor. In the last two last cases
the dissipation factor will be displayed, if the
capacitance measuremetn is activated. The
quality factor will be displayed on the other
cases.
UNIt AReA
Display of the current unit.
Downloaded from www.Manualslib.com
bias voltage to
DC
. If the BIAS function is
, L and R . In parallel mode the
p p s
, L
p p
Θ =
-180° to
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O p e r a t i o n o f t h e H M 8 0 1 8

Operation of the HM8018

Frequency

The HM8018 offers five different test frequencies:
100 Hz, 120 Hz, 1 kHz, 10 kHz, 25 kHz. The frequency
accuracy is ±0.01%. The test frequency is selected
by pressing several times the FREQUENCY key
until the corresponding indicator lights up. A
change of the frequency can introduce a model
change (serial to parallel or parallel to serial),
if the instrument is in automatic mode and if the
impedance measurement exceeds the 1000 Ω
threshold.
For high impedances and with 50 Hz mains
frequency and 120 Hz test frequency, there may
occur a small instability in measurement due to
a bad mains frequency rejection. It is the same
for a 60 Hz mains frequency, when a 100 Hz test
frequency is selected. According to the mains
frequency, the test frequency will have to be set
as shown in the chart below:
Mains
50 Hz
Mains
60 Hz
or R .
p

Test voltage

The HM8018 generates a 0.5 V
(unloaded). The level accuracy is ±5% for frequen-
cies up to 10 kHz, and ±10% for 25 kHz. The voltage
is applied to the component to test by a source
0,5
0,4
0,3
0,2
0,1
0
1,E-01 1,E+00 1,E+01 1,E+02 1,E+03 1,E+04 1,E+05 1,E+06 1,E+07 1,E+08
Measuring range
The HM8018-2 offers 6 impedance ranges (R1-R6). The
100 Hz 1 kHz 10 kHz 25 kHz
120 Hz 1 kHz 10 kHz 25 kHz
sine test voltage
rms
voltage at the component terminals
for the different ranges
R1,R2 R3 R4 R5,R6
Component impedance
Subject to change without notice
instrument measu
the instrument sw
makes a new me
validity domain o
value, if not, the
a built in hysteres
changes when a
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Range
Change
21
1 to 2 |Z
2 to 3 |Z
3 to 4 |Z