Fluke 744 Fluke 744 Users Manual - Page 72

Ramping the Output, Sourcing in Percent of Scale.

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744 Users Manual Ramping the Output Ramping sweeps the source up or down in value. Use the ramp feature to check a limit switch or alarm, or any time you want a smoothly increasing or decreasing output function. You can set the calibrator to ramp up or down in engineering units (mV, V, mA, °C, etc.) or % of scale. During ramping, the output is adjusted 4 times per second. The size of the steps is determined by your choices of endpoints and ramp time. For example, if you set the calibrator to ramp from 1 mV to 1 V over 10 seconds, the output is adjusted in approximately 25 mV steps. Ramping continues until the selected limit is reached, or until an optional trip condition is encountered. The optional trip detect works as follows: during ramping, the calibrator checks for either a 1 V change in dc voltage or a change in continuity status (Open or Short) from one ¼ second interval to the next. Proceed as follows to ramp (i.e., sweep the source): 1. Refer to the appropriate heading earlier in this manual (e.g., "Sourcing Electrical Parameters") and connect the calibrator to the circuit to be tested. Figure 22 shows an example. 2. To automatically stop ramping if a trip condition is detected, connect a voltage trip circuit to the V MEAS jacks or a continuity trip circuit to the mA Ω RTD MEAS jacks. (Continuity detection is not available when sourcing current.) 3. If necessary, press M for SOURCE mode. 4. Set the calibrator for the desired source value as previously described. 5. If you want to ramp the output in % of scale, set % of scale as described previously under "Sourcing in Percent of Scale." 6. Press the More Choices softkey. 62

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744
Users Manual
62
Ramping the Output
Ramping sweeps the source up or down in value.
Use the ramp feature to check a limit switch or alarm,
or any time you want a smoothly increasing or
decreasing output function. You can set the
calibrator to ramp up or down in engineering units
(mV, V, mA, °C, etc.) or % of scale.
During ramping, the output is adjusted 4 times per
second. The size of the steps is determined by your
choices of endpoints and ramp time. For example, if
you set the calibrator to ramp from 1 mV to 1 V over
10 seconds, the output is adjusted in approximately
25 mV steps.
Ramping continues until the selected limit is reached,
or until an optional trip condition is encountered. The
optional trip detect works as follows: during ramping,
the calibrator checks for either a 1 V change in dc
voltage or a change in continuity status (
Open
or
Short
) from one ¼ second interval to the next.
Proceed as follows to ramp (i.e., sweep the source):
1.
Refer to the appropriate heading earlier in this
manual (e.g., “Sourcing Electrical Parameters”)
and connect the calibrator to the circuit to be
tested. Figure 22 shows an example.
2.
To automatically stop ramping if a trip condition
is detected, connect a voltage trip circuit to the V
MEAS jacks or a continuity trip circuit to the mA
Ω
RTD MEAS jacks. (Continuity detection is not
available when sourcing current.)
3.
If necessary, press
M
for SOURCE mode.
4.
Set the calibrator for the desired source value as
previously described.
5.
If you want to ramp the output in % of scale, set
% of scale as described previously under
“Sourcing in Percent of Scale.”
6.
Press the
More Choices
softkey.