Hameg HM8118 Operator's Manual

34
Subject to change without notice
MAN: A measurement will be triggered by pressing the TRIG/
UNIT button.
EXT: a rising slope at the external trigger input will start a
measurement. In the course of a measurement any signals at
this input will be ignored until the cycle has been completed.
The TRIG/UNIT button will light up any time a measurement was
started. Each trigger will only generate one measurement.
Averaging may also be used with manual or external triggering;
the number of measurements will be given by the number of
averaging periods selected.
Averaging
If the function AVG is selected the average of a number of
measurements will be calculated and displayed. For the selec-
tion of the number of measurements press SELECT
3
, use the
menu SETUP and choose AVG: the number may be chosen from
2 to 99 or MED. The display will show „AVG“ if this function is
active. If MED is selected, the HM 8118 will perform 6 measure-
ments, it will discard the smallest and the highest and average
the remaining 4 results. This method is handy for eliminating
single erroneous results; e.g. if a component is inserted into
a test fi xture, the fi rst measurement will in general be wrong
because contact is made during a measurement cycle, so this
fi rst result will differ substantially from the following correct
ones. So this fi rst wrong result will be discarded.
3
Setting of instrument parameters
The instrument parameters can be selected by pressing the SE-
LECT button
3
and by calling the menus SETUP, CORR, SYST,
BIN. The buttons L-R/2
36
, C-D/3
34
, C-R/4
32
, R-Q/5
30
are used
to select the associated submenus. Depending on the function,
the parameters may be selected using the lighted arrow buttons
and the KNOB
6
. The parameter selected may be edited by
pressing the KNOB, the display will show a blinking „E“ (for edit).
Numerical values may also be entered via the keyboard; this may
be done by any of the following methods: fi rst select the parame-
ter, then press SELECT or TRIG/MODE/ENTER
25
or the KNOB
6
again, this will open a fi eld in the display which may or may
not also show the unit (depends upon the parameter). Following
the numerical entry, the preselected unit may be changed by
pressing TRIG/MODE/ENTER or the KNOB. The numerical entry
will be stored upon pressing TRIG/MODE/ENTER or the KNOB.
Use the BIAS/ button to modify an incorrect entry.
Menufunction SETUP
The submenu of SETUP allows the following settings:
Frequency FRQ
The measuring frequency may be set from 20 Hz to 200 kHz.
Voltage LEV
The measuring voltage may be set from 20 mV
rms
to 1.5 V
rms
.
BIAS voltage or current
A voltage bias may be set from 0 to + 5 V (internal) or from 0 to
+ 40 V (external). A bias current may be set from 0 to + 200 mA
(internal). The bias voltage or current can be turned on/off.
Measuring range RNG
The ranges may be selected automatically or manually from 3
ohms to 500 kΩ.
Measuring speed SPD
The speed may be selected from SLOW (1.5 meas./sec) to MED
(8 meas./sec) to FAST (14 meas./sec).
Triggering TRIG
The trigger source and the trigger mode are selected here:
CONT (continuously), MAN (manually), EXT (externally).
Delay
A trigger delay may be selected from 0 to to 40,000 ms (40 s).
Averaging AVG
Averaging can be turned on/off, also the number of measure-
ment cycles to be averaged can be set here from 2 to 99, or the
mode MED selected.
Display of test signal levels voltage V
m
and current I
m
Here, the display of the voltage and current at the component’s
terminals may be turned on/off.
Guarding GUARD
For guarded measurements two modes are available: AUTO
(automatic) or DRIVE. Guarding is used at low voltage levels.
Deviation DEV_M:
The display of the percentage or absolute (ABS) deviation of the
measured main value from the reference value REF_M can be
turned on/off.
Reference REF_M:
A measured value may be entered as the reference into the
main (M) reference memory. The following units are allowed:
H, mH, μH, nH, F, mF, μF, nF, pF, Ω, mΩ, kΩ, MΩ, or S, kS, mS,
μS, nS, pS. As long as this fi eld is open, the actual measured
value of the DUT may be set as the reference by pressing the
button TRIG/UNIT
27
.
First-time operation

Hameg HM8118 Specifications

General

Brand	Hameg
Model	HM8118
Category	Measuring Instruments
Language	English