36
Subject to change without notice
KEY BEEP
Here the key beep may be turned on/off.
TALK ONLY
Here the „talk only“ mode of the interface may be selected.
BAUD rate selection
The Baud rate of the RS-232 interface may be set to: 1200, 2400,
4800, 9600, 19200 baud.
MAINS FRQ
Here the actual mains frequency may be set, either 50 or 60
Hz.
Instrument information INFO
Here the instrument’s fi rmware version, the hardware version of
the FPGA, the cal date and the serial number are displayed.
Factory settings
Frequency FRQ
1,0 kHz
Level LEV
1,00 V
BIAS OFF
Range RNG
AUTO
Meas. speed SPD
SLOW
NUM 1
FUNC R-X
Calibration open circuit
OFF
Calibration short circuit
OFF
Calibration LOAD
OFF
Triggering TRIG
CONT
Trigger DELAY
0 ms
Averraging AVG
1
Voltage / Currant V
m
/I
m
OFF
Guarding GUARD
OFF
Deviation DEV_M
OFF
Reference REF_M
0,00000 H / mH / μH / nH / F
mF / μF / nF / pF /
Ω /
m
Ω
k
Ω /
M
Ω /
S / kS / mS / μS /
nS / pS
Deviation DEV_S
OFF
Reference REF_S
0,00000
Ω /
m
Ω /
k
Ω /
M
Ω /
S
kS / mS / μS / nS / pS / °
Constant voltage CST V
OFF
NUM 1
Function FUNC
R-X
Reference LOADM
0,00000
Ω
Reference LOADS
0,00000
Ω
CONTRAST
49 (dep. on the display)
KEY BEEP
ON
TALK ONLY
OFF
Baud rate BAUDS
19200
MAINS FRQ
50 Hz
Calibration
Prior to any measurement the open circuit, short circuit and load
calibration steps should be performed in order to avoid measure-
ment errors. The open/short circuit calibration compensates
for the effects of parasitic impedances of the connections to the
component under test. A load calibration is especially suitable in
order to take an impedance measured before the measurement
of the unknown into account. Any calibration must be performed
at the actual measuring frequency. In order to achieve the best
accuracy all three calibration steps should be carried out in the
same set-up and the same environmental conditions used for the
measurement of the unknown, especially the placement of the
leads should remain identical. The measurement leads should
be far from any metallic objects and the hands of the operator.
In order to initiate the three calibration steps the respective pa-
rameter must be set to ON by pressing SELECT
3
and calling
the menu CORR. The parameters OPEN/SHORT/LOAD can now
be set using the arrow buttons
7
or the KNOB
6
.
13
12
11
Open circuit calibration procedure
In order to perform a correct open circuit calibration there must
be nothing connected to the measurement leads! To start the
cal function press the button OPEN
11
: the display will show
„Opening (measuring frequency)“.
Short circuit calibration procedure
In order to perform a correct short circuit calibration the
measurement leads must be shorted directly with no compo-
nents attached. To start the calibration press the button SHORT
12
: the display will show „Shorting (measuring frequency)“
Procedure of the calibration with a known load
After the selection of the desired measuring function, e.g.
L-Q
,
the calibration with a known load is performed separately for the
main display LOADM and the second display LOADS (S stands
for “sub”). It is recommended to choose the value of this load
close to the expected load by the DUT. Press the button LOAD
13
, the display will show “LoadCal: (Measuring frequency)”.
STOP
Please note:
Any calibration with a known load requires that
values were entered in both reference memories
(LOADM and LOADS). (In the above example a
value for the expected inductance in LOADM and a
value for the expected quality factor Q in LOADS.
The latter is only valid for the selected measuring
frequency.)
The calibration procedure takes a few minutes; as soon as it is
ended the corresponding message in the display vanishes.
If no calibration can be performed successfully an error mes-
sage will be displayed.
– The open circuit cal is possible if the impedance is
>
10 kΩ
– The short circuit cal is possible if the impedance is
<
15 Ω
or the resistance
<
10 Ω
– The LOAD cal is possible for impedances and resistances
within the full measurement range.
F i r s t - t i m e o p e r a t i o n
