Fluke RPM4 manual 4 4SDS, 4.1 1TEMP OPEN/CLOSE, SDS temporary Hi 1close 2open

3. OPERATION

3.5.4 <4SDS>

PURPOSE

To open and close SDS temporarily for the Hi or Lo Q-RPT or to turn the SDS function ON and OFF full time for the Hi or Lo Q-RPT.

See Section 3.2.7 for complete information on RPM4’s SDS (Self Defense System) feature.

PRINCIPLE

SDS is a self defense system to protect RPM4 Q-RPTs from overpressure (see Section 3.2.7). Normally, opening and closing SDS is performed automatically by the RPM4 or by the operator using the [SDS] key.

[SPECIAL], <4SDS> gives further control over the SDS function. This includes:

a)the possibility of temporarily opening or closing SDS on either the Hi or Lo Q-RPT (see Section 3.5.4.1), and; b) turning OFF SDS so that it is open full time and RPM4 can be operated as if SDS were not installed (see Section 3.5.4.2).

The temporary opening or closing of SDS allows the SDS open/closed state to be set immediately to the desired state. Following the change, normal automated operation of SDS and control using the [SDS] key is still valid. This function is often used to open SDS on the inactive Q-RPT in PRM4s with dual Q-RPTs.

Setting the SDS function to full time OFF eliminates the SDS function completely until is set to full time ON again.

3.5.4.1<1TEMP OPEN/CLOSE>

OPERATION

See Section 3.2.7 for complete information on RPM4’s SDS (Self Defense System) feature.

To temporarily open or close the SDS of the Hi or Lo Q-RPT press [SPECIAL], <4SDS>, <1temp open/close>. If the RPM4 has two Q-RPTs and both have SDS, the Q-RPT must then be selected. The next display is:

The cursor is on the current state of SDS for the designated Q-RPT. Select <1close> to close SDS or <2open> to open SDS and return to the MAIN RUN screen. [ESC] to return without making changes.

SDS temporary: Hi 1close 2open

If <2open> is selected and SDS for the Q-RPT is not already open, the SDS opening screen with indication of the maximum pressure of the Q-RPT is displayed. This is the same screen used when opening SDS using the [SDS] key (see Section 3.3.8). Check that the pressure applied to the Q-RPT module TEST(+) port does not exceed the Pmax! value before confirming that SDS should be opened.

Opening SDS with a pressure greater than Pmax! applied to the test port may cause overpressure damage to the Q-RPT.

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