Introduction To Hm6042; General; Operating Advice; Using Of The Hm6042 - Hameg НМ6042 Manuel

Introduction to HM6042

General

The HM6042 provides DC parameter characterization of 2- and
3-lead semiconductor devices like transistors, diodes and
MOSFETs. Five characteristic curves are displayed on the
CRT's screen and digitized to be used for the calculation and
indication of ten different parameters. Depending on the
parameter to be measured one or two cursors enable the user
to precisely select the point of measurement on one of the
curves. The microprocessor-operated instrument is extremely
versatile, yet remarkably easy to operate. Most of the
instrument set-ups are done automatically by the instrument
according to the selected measuring function.

Operating advice

To use the HM6042 no special expertise is required. The
instrument is easy to set-up and operation is straightforward.
Nevertheless, a few basic guidelines should be followed in
order to ensure problem-free operation of the curve tracer.
The brightness of the ray tube is not to be set to high because
the ray might burn-in.
For protection of the connected devices the following values
are presetted after power-on:
I = 2 mA;
max
U = 2 V;
max
P = 0.04 W;
max
I = ca. 0.4 µA
B
(V = –0 V N-FET; +10 V P-FET).
G
Due to its measuring technique voltages up to 50 V
are present at the 4 mm banana jacks, marked as
E/S, C/D and B/G. Therefore, it is assumed that the
HM6042 will only be operated by qualified per-
sonnel which is acquainted with the danger in-
STOP
volved.

Using of the HM6042

Screen settings

Adjusting the trace rotation
Due to influences of the magnetic earth field it may be
necessary to compensate an angular misalignment of the
trace. To adjust the trace into its horizontal position (in paral-
lel to the bottom grid line) turn the TR potentiometer
below the CRT screen with a small screwdriver. The DUT
function may not be activated during this procedure.
Adjusting Y-POS./X-POS.
Normally the readjustment of the X and Y position of the trace
is not necessary. However, if the left end of the trace is not
aligned to the lower left corner of the grid you should adjust it
to start at this point. To perform this procedure use the
11 12
Y-POS. and the X-POS.
the CRT screen at the front panel of the instrument.
13
located
screws, which are located below
U s i n g o f t h e H M 6 0 4 2

Performing device tests

As soon as the HM6042 is switched on, a baseline is visible at
the CTR screen as long as no DUT (Device Under Test) is
inserted. A bright spot on the line indicates the current cursor
position.
The standard device adapter, as supplied with each HM6042, is
to be mounted to the instrument using the banana jack
17
combination at the front panel of the instrument. The terminals
are designated as E/S (Emitter / Source), C/D (Collector / Drain)
and B/G (Base / Gate). For testing diodes please use terminal E
17
and C and set the BIP/FET switch
Thyristors can be triggered with a max. current of 10 mA but
displaying characteristic curves of thyristors is only restricted
possible. The adapter is able to carry two DUTs; with the help of
the instrument's memory function and the device adapter's toggle
switch device selections and component matching tests can be
performed easily.
If the standard device adapter is not suitable for special test
purposes a DUT can be connected to the terminals using
ordinary test cables. Their maximum length is limited to 25
cm each. The measurement accuracy of the instrument
however can be degraded due to hum and noise on the cables.
The use of shielded cables is not recommended because of
their relatively high stray capacitance.
When using single wire connections extreme care
has to be taken for safety purposes.

Choosing the DUT type

The HM6042 has to be set-up according to the type of DUT to be
proved. To test NPN bipolar transistors switch BIP/FET
16
switch NPN/PNP has to be in released position. When working
with PNP transistors switch NPN/PNP
locked position. As usual, the measurement is performed using
the commonemitter circuit. To test FETs set switch BIP/FET
into the locked position. For diode testing switch BIP/FET
to be in FET position. Thyristor measurement requires the same
settings as for bipolar transistors. The selected type of DUT will
be shown in the LCD . To start a test the push button DUT
has to be pressed. Immediately, the value of the selected
parameter appears on the LCD
from its active to its inactive state by pressing the DUT key
repeatedly; simultaneously the DUT will be disconnected from
the internal test circuitry. The inactive state is indicated on the
LCD by the message ''Output OFF".

Setting the test ranges

Through its range settings the instrument is able to limit the
test voltage (V , V ) and the test current (I
CE DS
values. The ranges for current, voltage, and power can be
selected by use of the push buttons for:
max 19
I 200.0 mA
max 21
V 40.0 V
max 23
P 4.0 W
18
The corresponding LEDs ,
value of the range set. In test mode BIP the rotary knob enables
the user to adjust the base current in incremental steps
according to the selected range as defined below:
Range Current (I )
B
1 0,3 ... 100 µA
2 3,0 ... 1 µA
3 30 ... 10 mA
15
to position FET (locked).
15
16
has to be set into the
15
. The instrument can be toggled
, I ) to predefined
C D
20.0 mA 2.00 mA
10.0 V 2.00 V
0.4 W 0.04 W
20 22
and indicate the maximum
Current /step
0,8 µA ± 10 %
8 µA ± 10 %
80 µA ± 10 %
Subject to change without notice
and
15
has
14
14
21