Description of Function
Internally or externally triggered integrating DC voltage measurement. Depending on mode, this function acts as a control function or a measurement function.
Largest amplitude occurring on the signal. Can be used to establish the measurement range or to select a suppressor circuit.
Specification of which signal edge is to act as trigger (p = positive edge, n = negative edge).
Trigger threshold for measurement relative to trigger signal reference (see Example 1 Beispiel1_DCVTrg , Example 2 Beispiel2_DCVTrg and the example for DCITrg Beispiel_DCITrg ).
Trigger delay for the measurement (see Example 1 Beispiel1_DCVTrg , Example 2 Beispiel2_DCVTrg and the example for DCITrg Beispiel_DCITrg ).
Period over which the signal is integrated. With the output stage tests (Uab, Ulow, Uhigh) the integration period with an inductive load should be taken from the diagram for
Example 1
Beispiel1_DCVTrg
or
Example 2
Beispiel2_DCVTrg
, and with an ohmic load, from the diagram for the example for
DCITrg
Beispiel_DCITrg
. In the event of superimposed interference signals, it is advisable - wherever possible - to select a multiple of the interference signal period as the integration period.
If the integration period determined is less than the testing instrument's shortest integration period, the testing system may use a sample & hold measurement instead of an integrating measurement.
In the case of external triggering, the control unit pin (e.g. 43) or a (user-) defined signal name from the Signals Table (e.g. UB) is entered here. In the case of internal triggering (trigger signal = test signal), ´i´ is entered here.
Specification of trigger signal reference:
In the case of external triggering, the control unit pin (e.g. 68) or a (user-) defined signal name from the Signals Table (e.g. UB) is entered here. In the case of internal triggering (trigger signal = test signal reference), ´i´ is entered here.
If the test read function receives no measured reading input within the period specified for the timeout, the measurement is aborted.
Standard value: 1s
The Mode indicates whether the function returns a result (m) or whether the testing instrument is simply prepared for the test (s). Mode m can only be used with periodic test signals. In the case of non-periodic test signals, the test signal is applied and the testing instrument prepared (mode s). The trigger event is subsequently activated and then the test read function RDCVTrg IDH_RDCVTrg invoked.
Figure 6a: Shut-off peak with internal triggering
Trigger level: UTr,p = 0.5(Uab - Ulow) + Ulow
UTr,n = 0.5(Uhigh - Ulow) + Ulow
Uab90,p = 0.9(Uab - Ulow) + Ulow
Uab90,n = 0.9(Uab - Uhigh) + Uhigh
Trigger delay: tD,p = 0.4(t3 - t2) + (t2 - t1)
tD,n = 0.4(t6 - t5) + (t5 - t4)
Integration period: tID,p = 0.2(t3 - t2)
tID,n = 0.2(t6 - t5)
Figure 6b: Shut-off peak with external triggering
With triggering by positive edge of trigger signal, the following applies:
Trigger level: UTr,p = 0.5(UTr,high - UTr,low) + UTr,low
Trigger delay: tD,p = 0.4(t2 - t1) + (t1 - t0)
Integration period: tID,p = 0.2(t2 - t1)
With triggering by negative edge of trigger signal, the following applies: