Rohde & Schwarz HMC8012G, Руководство пользователя

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48
Instrument Functions
Due to hardware limitation the volume of the continuity test (bee-
per) is not variable and therefore can not be adjusted.
5.6 Measuring Sensors (PT100 / PT500 / PT1000)
Sensor measurements can be performed with various
temperature probes. The temperature probe HZ812 (2w)
is available as optional accessory. Depending on the type
used, you can select „2w“ or „4w“ with the respective soft
menu key. The soft menu key PT TYPE allows you to select
PT100, PT500 or PT1000 as probe type. The measurement
value may be displayed in °C, K or °F (UNIT).
To perform precise measurements, it is necessary to
compensate for the measurement section with the NULL
function, especially for the two-wire measurement. PT sen-
sors include a lead resistance which is typically indicated
on the data sheet. For an optimally adjusted measurement
section, it is necessary to know the exact lead resistance.
The measurement rate in this case is 10 measurements per
second.
5.7 Continuity / Diode Testing
Pressing the key opens the main menu for the diode
and continuity testing If the soft menu key is marked in
yellow, the respective function DIODE or CONTINUITY is
activated. For both functions, you can define / set a so-
called threshold via soft menu key THRESHOLD. In addi-
tion, the soft menu key BEEP allows you to activate (ON) or
deactivate (OFF) an acoustic signal to be used in case of a
Fig. 5.9: 2-wire sensor measurement (temperature)
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temperature (2-wire)
Fig. 5.10: 4-wire sensor measurement (temperature)
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temperature (4-wire)
threshold violation. For the diode testing, the measurement
rate is 10 measurements and for the continuity testing 200
measurements per second.
5.8 Measuring with HOLD Function
The HOLD function allows you to maintain the current
measurement results on the display. If you press the HOLD
key (white LED is illuminated), the measurement result(s)
will be frozen on the display. Press the HOLD key again
(LED is off) to deactivate the function.
5.9 Trigger Function
Pressing and holding the TRIG key or pressing the SETUP
key (submenu TRIGGER) opens the trigger menu. The soft
menu key Mode and the knob allow you to select the res-
pective trigger mode. There are three different options to
trigger a measurement:
❙ Manual :
If the trigger mode MANUAL is selected, press the key
TRIG to start recording measurement values. The TRIG
key blinks while measurement values are captured. Press
the TRIG key again to stop the capture of measurement
values. The TRIG key will stop blinking. The label „Ar-
med“ indicates that the instrument is waiting for a trigger
(waiting for the TRIG key to be pressed again) and is
consequently not triggering at the moment.
❙
Single
:
In the trigger mode SINGLE, the soft menu key INTER-
VAL and the knob allow you to select a measurement
interval. The measurement interval describes the time
Fig. 5.11: Diode testing
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Diode
Fig. 5.12: Trigger menu Auto